СПОСОБ ПОЛУЧЕНИЯ АФФИНИРОВАННОГО ПАЛЛАДИЯ ИЗ ПЛАТИНОПАЛЛАДИЕВЫХ ХЛОРИДНЫХ РАСТВОРОВ

Изобретение относится к области металлургии цветных металлов, в частности к аффинажу платиновых металлов. Способ предусматривает при получении аффинированного палладия перед осаждением платины окислительную обработку раствором хлората натрия хлоридного платинопалладиевого раствора при 70-90oС. Способ позволяет снизить содержание примесных элементов в финишной соли палладия, сократить затраты на ее переаффинаж, а также снизить безвозвратные потери платины с аффинированным палладием. 2 табл.

СПОСОБ ПЕРЕРАБОТКИ РАСТВОРОВ, СОДЕРЖАЩИХ ЦВЕТНЫЕ МЕТАЛЛЫ

Изобретение относится к гидрометаллургическим способам переработки растворов, содержащих цветные металлы, осаждением гидратов цветных металлов с помощью магнийсодержащего осадителя. В предложенном способе магнийсодержащий осадитель перед использованием подвергается предварительной обработке карбонизацией. Предварительная обработка заключается в продувке водной пульпы магнийсодержащего осадителя углекислым газом под давлением 0,1-0,5 МПа при температуре не более 20-25°С в течение 10-30 мин. После окончания продувки углекислым газом пульпа фильтруется, а фильтрат, содержащий бикарбонат магния, направляется на операцию осаждение гидратов цветных металлов из растворов. Оптимальный расход раствора бикарбоната выбирается из расчета перевода 70-90% цветных металлов из растворов в осадок гидратов цветных металлов, образующийся в процессе осаждения. Обеспечивается снижение остаточного содержания магния в осадке. 5 з.п. ф-лы, 7 табл., 7 пр.

СПОСОБ ИЗВЛЕЧЕНИЯ НИКЕЛЯ И/ИЛИ КОБАЛЬТА ИЗ РУДЫ ИЛИ КОНЦЕНТРАТА

Изобретение может быть использовано для гидрометаллургического извлечения никеля и/или кобальта из руд и концентратов. Предложенный способ предусматривает окисление руды или концентрата под давлением при 130oС - 250oС в присутствии кислорода и кислого раствора, содержащего серную кислоту или сульфат металла, гидролизуемый в кислом растворе, а также ионы галогена, с получением раствора извлекаемого металла, обеспечивается удешевление процесса и повышение степени извлечения металлов. 21 з. п. ф-лы, 7 ил. , 1 табл.

СПОСОБ ВОССТАНОВЛЕНИЯ НИКЕЛЯ ИЗ ВОДНОГО РАСТВОРА

Изобретение относится к способу осаждения никеля из водного раствора, содержащего сульфат никеля, в виде металлического порошка, приемлемого в качестве легирующего элемента для высококачественной стали. В предложенном способе восстановление никеля осуществляют непрерывно в одном или нескольких автоклавах при температуре 80-180°С и давлении водорода 1-20 бар, за счет чего осаждение (получение) продукта может быть значительно увеличено по сравнению со способами, реализующими периодические процессы осаждения никеля, проводимые в установках или аппаратах, имеющих такие же размеры. 2 н. и 27 з.п. ф-лы, 2 ил., 3 табл.

ВЫСОКОЧИСТЫЙ ТАНТАЛ И СОДЕРЖАЩИЕ ЕГО ИЗДЕЛИЯ, ПОДОБНЫЕ МИШЕНЯМ ДЛЯ РАСПЫЛЕНИЯ

Предложены высокочистые металлический тантал и содержащие его сплавы. Металлический тантал предпочтительно имеет чистоту по меньшей мере 9,995% и более предпочтительно по меньшей мере 99,999%. Также предложены металлический тантал и его сплавы, которые или имеют размер зерна около 50 мкм или менее, или текстуру, в которой (100) полюсная фигура имеет интенсивность центрального пика ниже, чем примерно 15 рандом, или логарифм отношения интенсивностей (111):(100) центрального пика больше, чем примерно 4,0, или любое сочетание этих свойств. Кроме того, предложены изделия и составляющие, изготовленные из металлического тантала, которые включают, но не ограничиваются этим, мишени для напыления, конденсаторные емкости, резистивные пленочные слои, проволоку и т.п. Предложен также способ изготовления высокочистого тантала, который включает стадию взаимодействия соли, содержащей тантал с по меньшей мере одним соединением, способным восстанавливать данную соль до танталового порошка и второй соли в ...

СПОСОБ УМЕНЬШЕНИЯ КОНЦЕНТРАЦИИ РАСТВОРЕННЫХ МЕТАЛЛОВ И МЕТАЛЛОИДОВ В ВОДНОМ РАСТВОРЕ

Изобретение относится к обработке водных растворов и может быть использовано для уменьшения концентрации растворенных металлов и металлоидов в промывных водах пирометаллургического завода. Водный раствор, например поток, вытекающий из газопромывной колонны отходящего газа, обрабатывают для удаления ионов металлов и металлоидов путем осаждения на месте железистых ионов в результате добавления в него раствора, содержащего железистые ионы, соли или другого источника, содержащего железистые ионы, и раствора с источником ионов гидроксилов. Условия реакции включают температуру, равную по меньшей мере 60°С, и рН от около 6 до около 10. Способ обеспечивает эффективное удаление растворенных металлоидов, таких как селен, теллур, мышьяк с концентрацией металлоидов в растворе более 1 мг/л. 15 з.п. ф-лы, 2 ил., 5 табл.

СПОСОБ ИЗВЛЕЧЕНИЯ ЦВЕТНЫХ МЕТАЛЛОВ ИЗ ВОДНЫХ РАСТВОРОВ ИХ СОЛЕЙ

Изобретение относится к способу извлечения цветных металлов из водных растворов их солей и может быть использовано как для очистки отработанных растворов химического или гальванического никелирования от ионов никеля, кобальта, молибдена, вольфрама, ванадия висмута, так и для извлечения этих металлов из других растворов промышленного производства, а также для изготовления порошков указанных металлов или их суспензий. Техническим результатом изобретения является увеличение степени выделения цветного металла из раствора. Способ включает извлечение цветных металлов из водных растворов, содержащих гипофосфит натрия и ионы никеля, доведением соотношения мольных концентраций ионов никеля и гипофосфита натрия до величины, большей чем 1:1, концентрации ионов никеля в растворе до величины 5-2 г/л. Создают условия, способствующие восстановлению находящихся в растворе ионов цветных металлов до свободных металлов введением в раствор гидроксида аммония до рН раствора, равного 7,8-8,3. Затем вводят в ...

СПОСОБ ПЕРЕРАБОТКИ МАРГАНЦЕВЫХ РУД

Способ переработки марганцевых руд относится к цветной металлургии и может быть использован при гидрометаллургической переработке марганцевых руд до концентрата марганца различного назначения. Способ включает обработку измельченной до крупности 5-25 мм марганцевой руды при 40-90oС абгазной соляной кислотой 5,3-12,0 N и Т:Ж=1:(3,0-8,0), выделяющийся хлор поглощают щелочным раствором. После отстаивания пульпы и декантации жидкой фазы осаждают гидроксиды примесей при рН 4-6 и выделяют концентрат марганца смешиванием раствора соли марганца с раствором после поглощения хлора при температуре смеси 50-90oС, поддерживая рН 9-12. Концентрат марганца промывают горячей водой при Т:Ж=1:(2,5-3,5), отфильтровывают и сушат при повышенной температуре. Способ позволяет перерабатывать марганцевые руды различного минералогического состава, содержащие менее 30% марганца, при одновременном повышении степени их обогащения и извлечения до 94% марганца. 2 з.п. ф-лы, 1 ил., 2 табл.

ОЧИСТКА РАСТВОРОВ, СОДЕРЖАЩИХ МЕТАЛЛ

Изобретение относится к способу очистки содержащих металлы растворов, включающему нейтрализацию раствора, восстановление входящего железа (III) и удаление входящего растворенного цинка, посредством этого способа входящий содержащий металлы раствор нейтрализуют с использованием магнетита и/или металлического железа, входящее железо (III) восстанавливают до железа (II) с помощью добавления металлического железа, входящие тяжелые металлы осаждают добавлением осаждающего количества сульфида, осажденные сульфиды регенерируют с помощью фильтрации, раствор необязательно подвергают операции ионообмена для перевода входящего цинка в несвязанную в комплекс форму, после чего цинк выделяют в виде карбоната цинка, железо (II) в оставшемся растворе окисляют до железа (III), после этого раствор используют как таковой или подвергают дальнейшей обработке для повышения содержания металла, чтобы использовать его в нужных целях. Предложенный способ позволяет более экономически эффективно и просто восстановить ...

СПОСОБ ИЗВЛЕЧЕНИЯ ЗОЛОТА ИЗ ЗОЛОТОСОДЕРЖАЩИХ ВЫСОКОМИНЕРАЛИЗОВАННЫХ ХЛОРИДНЫХ РАСТВОРОВ

Изобретение может быть использовано для извлечения золота из высокоминерализованных растворов, например оборотных растворов калийного и калийно-магниевого производства. Предлагаемый способ позволяет попутно извлекать золото из промышленных растворов. Способ включает обработку высокоминерализованных растворов с содержанием золота не менее 10 мкг/л флокулянтом на основе полиакриламида и ОЖК в массовом соотношении 1 : 2 - 3 в количестве 0,2 и 0,4 - 0,6 мг/л соответственно и разделение флотацией, после чего раствор обрабатывают смесью бутиловых ксантогената и "Аэрофлота" в массовом соотношении 1 : 1 и в количестве 10 - 20 мг/л с последующим выделением золотосодержащего концентрата флотацией. Использование предлагаемого способа извлечения золота позволяет повысить извлечение золота из высокоминерализованных золотосодержащих хлоридных растворов и получить более богатый по золоту концентрат. 2 с. п. ф-лы, 1 табл.

СПОСОБ ПОЛУЧЕНИЯ МЕДНОЙ ПРОВОЛОКИ

Способ может быть использован для получения медной проволоки непосредственно из медьсодержащего материала. Заявленный способ включает сочетание трех отдельных технологий получения медной проволоки непосредственно из относительно загрязненного источника меди, например медной руды или медьсодержащих отходов. Первая из этих технологий включает экстракцию растворителем, вторая - электроосаждение и третья - обработку металла. Изобретение позволяет получить медную проволоку более простым и дешевым способом по сравнению с известными способами, 9 з.п.ф-лы, 3 ил.

Способ комплексной переработки титансодержащего минерального сырья

Изобретение может быть использовано в химической промышленности. При переработке исходного титансодержащего минерального сырья его увлажняют и смешивают с гидродифторидом аммония в стехиометрическом соотношении. Далее нагревают до температуры 108-130°C при перемешивании в течение 40-60 мин. Затем выщелачивают 15-18%-ным раствором фторида аммония при температуре 70-75°C и Т:Ж=1:100. Полученный нерастворимый осадок фтораммонийных солей железа отделяют от раствора фильтрованием и отмывают 10%-ным раствором фторида аммония при температуре 70-75°C. Декантацией отделяют от осадка более тяжелые частицы непрореагировавшего исходного минерального сырья. Полученный после фильтрации декантанта раствор, содержащий фторотитанат аммония, объединяют с раствором, отфильтрованным после выщелачивания, и подвергают доочистке от железа. Доочистку проводят путем частичного гидролиза 25%-ным раствором аммиака, который постепенно добавляют к фильтрату до pH 6,5-7,5 при температуре около 75°C. Далее проводят гидролиз ...

СПОСОБ ВЫДЕЛЕНИЯ, ЭКСТРАКЦИИ И ИЗВЛЕЧЕНИЯ НИКЕЛЯ, КОБАЛЬТА И МЕДИ ИЗ СУЛЬФИДНОГО ФЛОТАЦИОННОГО КОНЦЕНТРАТА, СТИМУЛИРУЕМОГО ХЛОРОМ, ПУТЕМ ОКИСЛИТЕЛЬНОГО ВЫЩЕЛАЧИВАНИЯ СЕРНОЙ КИСЛОТОЙ ПОД ДАВЛЕНИЕМ

Изобретение относится к гидрометаллургическому способу выделения, экстракции и извлечения ценных компонентов никеля, кобальта и меди из сульфидного флотационного концентрата. Способ включает стадии получения суспензии флотационного концентрата в серной кислоте, причем суспендированный флотационный концентрат подвергают выщелачиванию с использованием хлора при атмосферном давлении с последующим окислительным выщелачиванием под давлением при повышенной температуре в кислотной среде. После разделения жидких и твердых веществ, очистки и удаления кобальта раствор, содержащий никель, непосредственно подвергают электролизу, чтобы извлечь из него катодный никель. Способ позволяет повысить извлечение металлов, уменьшить время и число технологических стадий. 3 с. и 14 з.п. ф-лы, 3 ил., 4 табл.

СПОСОБ ПОЛУЧЕНИЯ ПЯТИОКИСИ ВАНАДИЯ

Изобретение относится к металлургии, конкретнее к процессам получения пятиокиси ванадия из растворов или пульпы из обожженных ванадийсодержащих шлаков монопроцесса. Технический эффект при использовании изобретения заключается в снижении содержания примесей (кремния и фосфора) в получаемой пятиокиси ванадия. Способ получения пятиокиси ванадия включает выщелачивание ванадия из шлака, фильтрование и очистку раствора, осаждение пятиокиси ванадия из раствора, подачу в раствор комплексного осадителя, содержащего соединения алюминия, железа (III) и карбонат щелочноземельных металлов в количествах, обеспечивающих соотношение элементов в осадителе Al, Fe и щелочноземельного металла в карбонате к оксиду кремния в пределах (0,20 - 0,25) : (0,03 - 0, 04) : (0,06 - 0,08) : 1 соответственно. Подачу комплексного осадителя возможно производить в пульпу. 1 з.п. ф-лы, 1 табл.

СПОСОБ ИЗВЛЕЧЕНИЯ МЕДИ, НИКЕЛЯ И КОБАЛЬТА ИЗ МЫШЬЯКСОДЕРЖАЩИХ АММИАЧНО-КАРБОНАТНЫХ РАСТВОРОВ

Использование: гидрометаллургические способы выделения металлов из аммиачно-карбонатных растворов. Сущность изобретения: на первой стадии способа проводят осаждение меди в виде сульфида меди элементарной серой при 105 - 110oC; на второй - проводят осаждение никеля и мышьяка процессом дистилляции до концентрации аммиака 3 - 5 г/дм3. Кобальт из раствора осаждают сульфидом натрия с одновременной дистилляцией аммиака до концентрации 0,1 - 0,3 г/дм3. 3 табл.

СПОСОБ ПЕРЕРАБОТКИ МЕДНО-НИКЕЛЕВОГО СЕРНОКИСЛОГО РАСТВОРА

Изобретение относится к гидрометаллургии меди и никеля и может быть использовано при переработке сернокислых растворов электролитического рафинирования меди, участков гальванической обработки сталей и регенерации отработанных щелочных аккумуляторов. Способ переработки сернокислых медно-никелевых растворов включает кристаллизацию сульфата никеля. При этом перед кристаллизацией раствор обрабатывают аммиачной водой до значения pH в пределах 4-4,5 при температуре, не превышающей 60°С. Кристаллизацию сульфата никеля ведут в виде его двойной соли путем изогидрической кристаллизации при охлаждении до 15-25° реакционного объема с последующим отделением кристаллической массы двойной соли от аморфной фазы сопутствующих компонентов и маточного раствора. Отделение кристаллической массы двойной соли от сопутствующих компонентов осуществляют в восходящем потоке с переменным гидродинамическим режимом, создаваемым маточным раствором при его линейной скорости в пределах 6-8 м/час. Техническим результатом ...

СПОСОБ ПРИГОТОВЛЕНИЯ КАЛЬЦИЕВОГО СУЛЬФИДИЗАТОРА ДЛЯ ОСАЖДЕНИЯ ТЯЖЕЛЫХ ЦВЕТНЫХ МЕТАЛЛОВ ИЗ КИСЛЫХ СУЛЬФАТНЫХ РАСТВОРОВ И ЖИДКОЙ ФАЗЫ ГИДРАТНЫХ ЖЕЛЕЗИСТЫХ ПУЛЬП

Способ может быть использован в гидрометаллургии тяжелых цветных металлов, в частности при осаждении последних из кислых сульфатных растворов и жидкой фазы гидратных железистых пульп. Способ включает обработку водной пульпы углекислого кальция диоксидом серы и серосодержащим восстановителем при повышенной температуре и непрерывном перемешивании. В качестве серосодержащего восстановителя используют сероводород, а обработку водной пульпы углекислого кальция ведут смесью диоксида серы и сероводорода при температуре 50 - 80oC, в течение 30 - 240 мин, при этом при молярном соотношении SO2 : H2S в смеси, большем или равном 1:2, значение pH обрабатываемой пульпы поддерживают равным 3,0 - 6,5, а при молярном соотношении SO2 : H2S в смеси, меньшем 1:2, значение pH пульпы поддерживают 8,0 - 9,5. Диоксид серы и сероводород можно использовать в составе восстановленных металлургических газов, снижаются затраты, повышается комплексность переработки полиметаллических промпродуктов, улучшается экология ...

СПОСОБ ВЫДЕЛЕНИЯ РЕНИЯ ИЗ КОНЦЕНТРАТА СУЛЬФИДОВ ПЛАТИНЫ И РЕНИЯ

Изобретение относится к способу выделения рения из концентрата сульфидов платины и рения. Способ включает обработку концентрата сульфидов водным раствором аммиака и после нагрева раствором пероксида водорода с получением раствора, содержащего рений и платину. После обработки концентрата сульфидов отделяют нерастворимый остаток и полученный раствор, содержащий рений и платину, обрабатывают серной кислотой до достижения значения рН, равного 0.0-1.0. После этого раствор подвергают нагреву и выдержке и отделяют образовавшийся осадок соединений платины от раствора рения. Технический результат заключается в возможности разделения платины и рения на стадии выделения рения из сульфидного концентрата. 1 табл., 1 пр.

СПОСОБ ПОЛУЧЕНИЯ ПЕНТАОКСИДА ВАНАДИЯ

Изобретение относится к цветной металлургии и может быть использовано при получении пентаоксида ванадия из окситрихлорида ванадия - побочного продукта производства губчатого титана. Способ получения пентаоксида ванадия включает разложение окситрихлорида ванадия в щелочном растворе, введение в раствор аммонийсодержащего неорганического соединения, выделение из раствора осадка метаванадата аммония, промывку и прокалку его с получением пентаоксида ванадия. При этом окситрихлорид ванадия вводят в 1-3 н. раствор карбоната натрия, обрабатывают неорганической кислотой до рН 1-2, нагревают до температуры 60-100oС, выдерживают 1-3 ч, нейтрализуют щелочным реагентом до рН 6-8, затем вводят в раствор аммонийсодержащего неорганического соединения, например в раствор хлорида и/или нитрата аммония. Способ позволяет уменьшить остаточную концентрацию V в маточном растворе метаванадата аммония, что приведет к снижению загрязнения водоемов. 3 з.п. ф-лы, 1 табл.

СПОСОБ ИЗВЛЕЧЕНИЯ ЦИНКА ИЗ КИСЛЫХ СУЛЬФАТНЫХ РАСТВОРОВ

Изобретение относится к гидрометаллургии цинка и может быть использовано при кучном, подземном выщелачивании, а также при очистке сточных вод. Целью изобретения является повышение содержания цинка в продукте и снижение энергозатрат на сушку. Цель достигается тем, что очистку кислых сульфатных растворов от твердых взвесей и примесей осуществляют с введением сульфата железа (III) при pH 5,5-6,6 и дальнейшем осаждении цинка при pH 8,5-9,0. Затем осадок цинка сгущают, фильтруют и нагревают в автоклаве до 130-170oC, после чего фильтруют и сушат. 3 табл.

СПОСОБ ИЗВЛЕЧЕНИЯ ДРАГОЦЕННЫХ МЕТАЛЛОВ ИЗ РАСТВОРОВ И УСТАНОВКА ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Использование: касается извлечения драгоценных металлов из растворов как при высоком, так и низком содержании извлекаемого металла в растворе. Изобретение может найти применение как самостоятельное, так и в единой технологической цепи с известными способами выделения драгоценных и других стратегически важных металлов, а также может использоваться в частности, в системах очистки и обезвреживания технологических (в том числе радиоактивных) отходов и сточных вод. Сущность способа заключается в том, что в технологическом процессе, включающем перемешивание исходного раствора в присутствии восстановителя с последующим селективным отделением полученного металлосодержащего продукта от раствора, перемешивание исходного раствора в присутствии восстановителя проводят при наложении лазерного излучения с частотой соответствующей резонансной частоте возбуждения ионов извлекаемого металла. Процесс протекает без изменения температуры раствора. Установка для извлечения драгоценных металлов из растворов ...

СПОСОБ ВЫДЕЛЕНИЯ ВАНАДИЯ ИЗ РАСТВОРОВ

Изобретение относится к гидрометаллургии и может быть использовано при производстве ванадиевой продукции, в частности, при производстве ванадиевых катализаторов. Предлагается способ выделения ванадия из раствора соединений пятивалентного ванадия, включающий осаждение в присутствии соединения четырехвалентного ванадия путем корректировки рН раствора серной кислотой при нагревании с последующим отделением осадка от раствора, в котором осаждение ведут при поддержании соотношения V+4 : V+5 = 2,0 ÷ 4,0 и рН 3,0-3,1. При этом в качестве исходного соединения пятивалентного ванадия используют метаванадат щелочного металла. При этом в качестве соединения четырехвалентного ванадия используют сульфат ванадила. Способ выделения ванадия из растворов позволяет значительно сократить время процесса при сохранении высокого процента выделения ванадия, при этом прост технологически. 2 з.п. ф-лы.

СПОСОБ ПОЛУЧЕНИЯ КАТАЛИТИЧЕСКИ-СОРБЦИОННОГО МАТЕРИАЛА И СПОСОБ ИЗВЛЕЧЕНИЯ МЫШЬЯКА В ЕГО ПРИСУТСТВИИ

Изобретение относится к области нефтепереработки и нефтехимии, а именно к удалению мышьяка и его соединений из нефтяных фракций, и может быть использовано на нефтеперерабатывающих предприятиях при очистке нефтяных фракций от примесей для последующего получения дизельного топлива и других нефтепродуктов. Предлагается способ получения каталитически-сорбционного материала для извлечения мышьяка из нефтяных дистиллятов, включающий получение мезопористого носителя из смеси, содержащей органическое соединение кремния и соединение алюминия, пропитку полученного носителя растворами гептамолибдата аммония и нитрата никеля. Способ отличается тем, что получение мезопористого носителя включает получение раствора темплата - триблоксополимера этилен- и пропиленоксида в разбавленной соляной кислоте, добавление в него предварительно приготовленной смеси тетраэтоксисилана и втор-бутоксида алюминия, перемешивание и выдерживание при 90-100°С, отношение кремния к алюминию в полученном мезопористом носителе ...

СПОСОБ ИЗВЛЕЧЕНИЯ И РАЗДЕЛЕНИЯ ЦВЕТНЫХ И РЕДКИХ МЕТАЛЛОВ

... 1. Способ выделения и разделения цветных и редких металлов из водных растворов осаждением карбонатов, гидроксидов или оксокарбонатов, отличающийся тем, что на первой стадии водный металлосодержащий раствор обрабатывают карбонатами, или гидроксидами натрия, или калия, или аммония, или кальция, отделяют осадок, содержащий соединения металлов, имеющих более низкое значение рН осаждения, от фильтрата, содержащего чистые соединения металлов с более высоким значением рН осаждения, осадок промывают водой и им обрабатывают свежую порцию исходного раствора, получая в осадке чистые соединения металлов с более низким значением рН осаждения и фильтрат, который направляют на первую стадию. 2. Способ по п. 1, отличающийся тем, что на первой стадии поддерживают значение рН в интервале 2,0 - 5,0, на второй стадии - в интервале 0,5 - 3,0. 3. Способ по п.1, отличающийся тем, что на второй стадии при обработке осадком в чистый продукт отбирают 0,6 - 0,9 массы металлов осадка. 4. Способ по п.1, отличающийся ...

СПОСОБ КОНЦЕНТРИРОВАНИЯ РАДИОНУКЛИДОВ РАДИЯ ИЗ ВОДЫ

Метод концентрирования радионуклидов из воды, включающий соосаждение радионуклидов в присутствии хлористого бария, фильтрование, промывку, прокаливание осадка и сплавление его с карбонатом натрия, отличающийся тем, что осаждение радионуклидов в виде хроматов осуществляют последовательным добавлением в 8-10 л воды насыщенных растворов хлористого бария (ВаСl2) в количестве 2 мл, бихромата калия (К2Сr2О7) в количестве 20 мл и уксуснокислого натрия (CH3COONa) в количестве 30 мл, сплавление полученного осадка проводят с 4 г карбоната натрия (Nа2СО3) и 2 г карбоната калия (К2СО3).

СПОСОБ ПОЛУЧЕНИЯ ВИСМУТА НИТРАТА ОСНОВНОГО

Изобретение относится к гидрометаллургии редких металлов, а конкретно к способам переработки висмутсодержащих материалов с получением висмута нитрата основного. Получение висмута нитрата основного проводят путем обработки висмутсодержащего материала азотной кислотой. Затем проводят гидролитическую очистку висмута от примесей добавлением раствора азотнокислого висмута в нагретую до 50-80°С воду при объемном отношении воды и висмутсодержащего раствора (7-9):1 с последующим доведением рН смеси водным раствором аммиака до 0,5-1,4. Осадок промывают водой при температуре 15-40°С и сушат при 80-120°С. Техническим результатом является повышение степени извлечения висмута в продукт до 96,8%, а также повышение удельной поверхности продукта до 1,08 м/г. 1 табл., 3 пр.

СПОСОБ ПОЛУЧЕНИЯ КОНЦЕНТРАТА, СОДЕРЖАЩЕГО РЕНИЙ И ПЛАТИНУ

Изобретение относится к гидрометаллургии редких и благородных металлов, в частности к способу получения концентрата, содержащего рений и платину. Способ включает совместное выделения платины и рения из кислых растворов введением в раствор серосодержащего восстановителя, в качестве которого используют тиосульфат натрия. Затем проводят отделение осадка сульфидов и других соединений рения и платины от раствора. При этом тиосульфат натрия вводят в виде водного раствора путем непрерывной равномерной его подачи в горячий кислый раствор, содержащий платину и рений, при соотношении масс реагента и растворенных рения и платины от 15 до 23. Технический результат заключается в сокращении расхода серосодержащего реагента и повышении степени извлечения платины из кислого раствора в концентрат за счет изменения методики ввода реагента осадителя в кислый раствор, содержащий платину и рений. 1 табл.

Способ удаления натрия из хлоридных растворов

Изобретение относится к способу удаления натрия из технологического потока гидрометаллургического процесса, содержащего хлорид аммония, хлорид никеля, хлорид меди, хлорид кобальта и/или хлорид магния. Способ включает стадии: (а) отведения отбираемого потока растворов и/или суспензий гидрометаллургического процесса из технологического потока гидрометаллургического процесса, (b) испарения воды из отбираемого потока с получением насыщенного раствора, содержащего натрий, (с) кристаллизации части хлорида натрия, содержащегося в насыщенном растворе, содержащем натрий, из указанного раствора с получением обедненного натрием раствора и (d) возврата обедненного натрием раствора в технологический поток гидрометаллургического процесса. Техническим результатом является повышение экономичности и экологической безопасности процесса. 17 з.п. ф-лы, 1 ил., 2 пр.

СПОСОБ ОЧИСТКИ РАСТВОРА СУЛЬФАТА ЦИНКА ОТ ПРИМЕСЕЙ

... 1. Способ очистки раствора сульфата цинка от примесей, включающий введение в раствор активирующей добавки и осаждение примесей цинковой пылью, отличающийся тем, что, с целью повышения степени очистки раствора и сокращения расхода цинковой пыли, в раствор после подачи цинковой пыли вводят вещества, замедляющие процессы растворения осажденных металлов-примесей. 2. Способ по п.1, отличающийся тем, что в качестве веществ, замедляющих процессы растворения, вводят фосфаты щелочных металлов, например 0,005 - 0,5 г/л гексаметафосфата или триполифосфата натрия.

СПОСОБ ИЗВЛЕЧЕНИЯ ЗОЛОТА ИЗ ЦИАНИСТЫХ РАСТВОРОВ

Способ извлечения золота из цианистых растворов, включающий коксование нефтяных остатков и сорбцию золота нефтекоксом, отличающийся тем, что, с целью повышения степени извлечения золота, коксование нефтяных остатков проводят в присутствии 3-7 мас.%, карбонатов щелочных металлов, а перед сорбцией проводят кипячение полученного продукта в воде с последующей его парогазовой активацией при 800-850oC в течение 0,5 ч.

СПОСОБ ОЧИСТКИ ЦИНКОВЫХ РАСТВОРОВ ОТ ПРИМЕСЕЙ

... 1. Способ очистки цинковых растворов от примесей, включающий введение в раствор активирующей добавки соли сурьмы, цинковой пыли и фосфатных солей, например триполифосфата, отличающийся тем, что, с целью исключения накопления балластных примесей в растворах цинкового производства, в качестве фосфатных солей используют фосфаты аммония. 2. Способ по п.1, отличающийся тем, что в качестве фосфатных солей используют пирофосфат аммония.

СПОСОБ ПЕРЕРАБОТКИ ПУЛЬПЫ ПОСЛЕ АВТОКЛАВНО-ОКИСЛИТЕЛЬНОГО ВЫЩЕЛАЧИВАНИЯ СУЛЬФИДНЫХ ПОЛИМЕТАЛЛИЧЕСКИХ МАТЕРИАЛОВ, СОДЕРЖАЩЕЙ ОКСИДЫ ЖЕЛЕЗА И ЭЛЕМЕНТНУЮ СЕРУ

Изобретение относится к области гидрометаллургии цветных металлов. Способ включает стадийное осаждение сульфидов цветных металлов из раствора окисленной пульпы металлическим железом и полисульфидно-тиосульфатным реагентом при температуре ниже точки плавления элементной серы и непрерывном перемешивании с последующим выделением сульфидов и элементной серы флотацией в коллективный серосульфидный концентрат. При этом осаждение сульфидов цветных металлов ведут в присутствии органической добавки, обладающей способностью к избирательной гетерокоагуляции сульфидов и элементной серы, при массовом отношении серы, вводимой с полисульфидно-тиосульфатным реагентом, к органической добавке, равном 1:(0,0015-0,020). После стадии осаждения сульфидов полисульфидно-тиосульфатным реагентом в пульпу дополнительно вводят металлическое железо. Технический результат изобретения - снижение расхода железа при одновременном сохранении качества серосульфидного концентрата и повышении уровня извлечения в него цветных ...

СПОСОБ ИЗВЛЕЧЕНИЯ ЛИТИЯ И ПЕРЕХОДНОГО МЕТАЛЛА С ПРИМЕНЕНИЕМ НАГРЕВАНИЯ

ЛАЗЕРНЫЙ ФОТОХИМИЧЕСКИЙ ПРОЦЕСС РАЗДЕЛЕНИЯ РЕДКОЗЕМЕЛЬНЫХ ЭЛЕМЕНТОВ

... 1. Способ разделения редкоземельных элементов, включающий осаждение элементов и отделение осадка от раствора, отличающийся тем, что осаждение проводится при облучении раствора оптическим излучением с частотой, соответствующей резонансной частоте возбуждения ионов выделяемого элемента в присутствии реагента-осадителя. 2. Способ по п. 1, отличающийся тем, что в качестве осадителя используются органические кислоты или их соли. 3. Способ по п. 1, отличающийся тем, что в качестве осадителя используются органические спирты. 4. Способ по п. 1, отличающийся тем, что в качестве осадителя используются реагенты, выделяющие в водном растворе ионы гидроксила. 5. Способ по п. 1, отличающийся тем, что осаждение производится при подаче в раствор импульсов электрического тока. 6. Способ по п. 1, отличающийся тем, что в облучаемый раствор вводится суспензия реагента-осадителя и дисперсного порошка выделяемого в данный момент элемента, частицы который служат в качестве центров зародышеобразования и кристаллизации ...

СПОСОБ ПЕРЕРАБОТКИ ЦИНКСОДЕРЖАЩИХ РАСТВОРОВ

Изобретение относится к цветной металлургии и гидрометаллургии цинка и может быть использовано для доизвлечения цинка из некондиционных продуктов и бедных цинксодержащих растворов. Способ включает осаждение цинка из растворов, предварительно очищенных от железа и меди, упариванием до плотности 1,2-1,3 при соотношении цинка к серной кислоте 1:1 с последующей кристаллизацией сульфата цинка в течение 60-72 ч и возвратом оборотных (остаточных) растворов на стадию выщелачивания. Причем в качестве исходных растворов используют рудничные (шахтные) воды и растворы после выщелачивания минерального сырья (продуктивные) растворы.

СПОСОБ ВЫДЕЛЕНИЯ БЛАГОРОДНЫХ МЕТАЛЛОВ ИЗ РАСТВОРОВ

Способ выделения благородных металлов из растворов, включающий химическое осаждение благородных металлов в виде нерастворимых осадков, отделение осадков и последующую переработку полученных осадков известными способами, отличающийся тем, что, с целью максимального (> 99,8%) извлечения благородных металлов проводится одновременное совместное осаждение их осадительной смесью из хлоридов и сульфидов щелочных металлов, причем количество подаваемого в смеси хлорида щелочного металла рассчитывается на 100% осаждения серебра, а количество сульфида щелочного металла должно составлять не менее 450% от теоретически необходимого для осаждения благородных металлов (Pt, Рd и т.д.) в виде сульфидов.

СПОСОБ ИЗВЛЕЧЕНИЯ НИКЕЛЯ ИЗ ОТРАБОТАННЫХ КИСЛЫХ РАСТВОРОВ ХИМИЧЕСКОГО НИКЕЛИРОВАНИЯ

Способ извлечения никеля из отработанных кислых растворов химического никелирования путем ступенчатой обработки исходного раствора карбонатом щелочного металла в присутствии гипофосфита при повышенной температуре, отличающийся тем, что обработку осуществляют карбонатом натрия в присутствии катализатора - мелкодисперсного порошка никеля, при игольном соотношении гипофосфита и никеля 1:1.

КОМПЛЕКСНЫЙ СПОСОБ ИЗВЛЕЧЕНИЯ НИКЕЛЯ ДЛЯ ИЗВЛЕЧЕНИЯ ГИДРОКСИДА НИКЕЛЯ ИЗ СЫРЬЕВЫХ МАТЕРИАЛОВ, СОДЕРЖАЩИХ НИКЕЛЬ

Изобретение относится к извлечению никеля из сырьевых материалов для извлечения никеля высокой чистоты в виде гидроксида никеля. Способ включает восстановительную термообработку первого сырьевого материала, содержащего никель и литий, последующее выщелачивание термически обработанного продукта. Обжиг с термообработкой второго сырьевого материала, содержащего никель и серу. Выщелачивают первый остаток от выщелачивания, получаемый в результате осуществления первого процесса выщелачивания, и продукт обжига, получаемый в результате осуществления обжига. Полученный продукт выщелачивания нейтрализуют. После нейтрализации нейтрализованный раствор очищают с удалением примесей. После этого из очищенного раствора проводят осаждение с извлечением никеля, а также извлечение гидроксида никеля в результате осуществления процесса осаждения. Способ позволяет извлечь из сырьевых материалов никель в виде гидроксида никеля. 21 з.п. ф-лы, 1 ил., 8 табл.

Способ осаждения меди из сульфатных растворов

Гидрометаллургический способ переработки стандартных свинцовых концентратов

METHOD FOR PRECIPITATION NON-FERROUS METAL SULFIDES OF HYDRATE FERROUS PULPS

Способ переработки медьсодержащих водно-аммиачных растворов

Использование гидрометаллургия меди и другие технологические процессы с использованием медьсодержащих водно-аммиачных растворов. Сущность: медьсодержащий водноаммиачный раствор контактируют с ионообменным материалом, содержащим фосфоновокислые функциональные группы, со скоростью пропускания раствора через слой ионита не более 3.4 м/г, после чего осуществляют нагревание раствора, обработку его щелочным реагентом и отделение осадка 1 табл ...

Способ осаждения никеля из углеаммиачных растворов, содержащих никель и кобальт

Способ выделения никеля из отработанных растворов химического никелирования

Изобретение относится к способам выделения металлов из отработанных растворов химической металлизации. Цель изобретения - снижение содержания ионов никеля в растворе до предельно допустимых концентраций в отходах гальванических производств. Восстановление никеля из отработанных растворов химического никелирования ведут гипофосфитом натрия в присутствии порошка никеля при соотношении содержания ионов никеля и гипофосфита натрия 1 : 5 при PH 6,5 - 7,0 и температуре 65 - 70°С. 1 табл.

Способ регенерации отработанных фиксажных растворов

Изобретение касается регенерации фиксажных серебросодержащих растворов. Цель изобретения - сокращение продолжительности процесса при сохранении высокой степени очистки раствора от серебра. Отработанный фиксажный раствор с концентрацией серебра 5-0,05 г/л доводят до PH 8-10, вводят раствор сульфида натрия с получением суспензии, содержащей осадок коллоидного серебра. Затем суспензию подвергают электрохимической обработке в электролитической ванне в течение 5-10 мин при поддержании на электродах ванны потенциала 0,1-0,6 В относительно хлорсеребряного электрода сравнения. При такой обработке образовавшаяся при введении в отработанные фиксажные растворы раствора сульфида натрия стабильная коллоидная система сульфида серебра коагулирует и осаждается на дно ванны. Раствор становится прозрачным и бесцветным и после депонтации и соответствующей корректировки может быть использовано для последующей обработки кино- и фотоматериалов. 2 табл.

Способ извлечения из водных растворов цветных и/или бллагородных металлов

Изобретение относится к способам выделения цветных металлов из водных растворов, содержащих растворенные соединения этих металлов. Цель изобретения - упрощение процесса . Способ предусматривает извлечение цветных металлов из водных растворов. Раствор пропускают через колонну, содержащую слой активированного угля с размерами зерен 0,0.1-8 мм и слой красного фосфора с размерами зерен 0,01-10 мм или смесь красного фосфора с. активированным углем при содержании его в смеси 15,7 - 98 мас,%. Активированный уголь располагают нижним слоем. Красный (.фосфор активируют гипохлоритом натрия. 1 з.п. ф-лы. СО оо о со :о ...

Способ очистки цинковых растворов от железа

Использование: гидрометаллургические процессы выделения железа из растворов путем его осаждения, может быть использовано в производстве цинка для очистки растворов, получаемых при выщелачивании обожженных сульфидных концентратов . Сущность: способ очистки цинковых растворов от железа (II) включает обработку раствора кислородом воздуха при введении сульфита цинка в количестве 0,2-2,0 г на 1 г железа (II) в растворе и выделение железа (III). 1 табл.

Verfahren zur Aufarbeitung arsenidischer und/oder antimonidischer Huetten-Zwischenprodukte

VERFAHREN ZUR AUFARBEITUNG VON RUECKSTAENDEN AUS DER HYDROMETALLURGISCHEN ZINK-GEWINNUNG.

In working up residues from the hydrometallurgical recovery of Zn, esp. from Zn electrolysis, in combination with an electrolytic Zn recovery, (a) the residue is leached with cell acid at 50-100 deg. C, so that a free acid concn. of 10-100 g/l is present at the end of leaching. (b) The undissolved ppte. is sepd. from the suspension. (c) The sepd. ppte. is passed into the hot acid leach of the Zn electrolysis. (d) Cu is pptd. by adding into the hot acid leach of the Zn electrolysis. (d) Cu is pptd. by adding fine-grained, metallic Fe in the soln., according to (b). (e) The pptd. Cu is sepd. (f) The liq. phase according to (e) is passed into one of the steps, before the Fe-pptn. of the Zn electrolysis.

Organic solvents recovered from raffinates in metal winning - where raffinate is stripped by steam in a scrubbing tower

Organic solvents are recovered from raffinates used in the counter-current solvent extn. of metal ions in the wet treatment of ores. After removing the metal ions, the raffinate is stripped using steam and/or gas, and the organic solvent is recovered from the vapours. Pref. 0.5-5 wt.% steam and/or gas is used for stripping the raffinate, esp. in counter-current in a scrubbing tower; and after stripping, the raffinate is pref. cooled in heating raffinate which contains solvent, i.e. before stripping. The stripped raffinate is pref. returned to the ore leaching process. Used in many hydrometallurgical processes, e.g. for winning U, Cu, V, W, where metals are extracted from aq. solns. by organic solvents using liq. -liq. extn. Practically all the organic solvent can be recovered.

VERFAHREN UND ANLAGE ZUR WIEDERGEWINNUNG VON IM ABWASSER VON ANLAGEN ZUR CHEMISCHEN OBERFLAECHENBEHANDLUNG BEFINDLICHEN METALLEN UND ANDEREN WERTSTOFFEN

Verfahren zur Extraktion elementaren Schwefels aus Laugeresten der Sulfiderzbehandlung durch Destillation und Kondensation

VERFAHREN ZUR WIEDERGEWINNUNG VON ADSORBIERTEM PALLADIUM AUS VERBRAUCHTEM SILIKATRÄGERMATERIAL

VON CHLORIDIONEN UNTERSTÜZTE HYDROMETALLURGISCHE EXTRAKTION VON KUPFER AUS SULFIDERZROHSTOFFEN

ABTRENNUNG UND GEWINNUNG VON METALLEN AUS VERUNREINIGTEN WAESSERN

METHOD OF REMOVING DISSOLVED FERRIC IRON FROM IRON-BEARING SOLUTIONS

... 1308761 Removing Fe3+ from solution ELECTROLYTIC ZINC CO OF AUSTRALASIA Ltd 5 Jan 1971 [15 May 1970] 436/71 Heading C1A Ferric iron is precipitated from an aqueous solution containing >5 g./l. Fe3+ together with other ions (Zn, Cu, Co and/or Ni; SO 4 2- and/or Cl-) by treatment with a neutralizing agent while maintaining the pH of the pulp so obtained at 1À7 to 3À5 and the temperature of the pulp at from 50‹ C. up to the boiling point at atmospheric pressure, preferably 65-95‹ C.; the solution and the neutralizing agent being continuously introduced into a precipitation vessel and being agitated therein and the rates of input of the reactants being controlled so as to maintain the specified conditions and to maintain the concentration of dissolved ferric iron in the solution component of the pulp at # 1 g./l., and separating the precipitated iron compound or compounds from the pulp. The starting solution may be a metal sulphate solution containing ZnSO 4 which ...

METHOD OF RECOVERING BASE METALS FROM FUSED SALTS

... 1471009 Refining nickel slags INCO Ltd 15 July 1974 [13 July 1973] 31302/74 Heading C7D Iron, cobalt, nickel, copper, zinc, tin, lead, and manganese dissolved as a chloride in a molten salt comprising an alkali or alkaline earth metal chloride or mixture of such chlorides is recovered by precipitation using hydrogen, hydrogen sulphide or both and separated as a liquid phase from the molten salt. The molten slag may be a slag obtained in the chlorination of a nickel matte and may comprise equal weights of sodium and potassium together with dissolved Ni, Co, Cu, Fe, Pb, Sn, Zn and Mn at a temperature of 750 to 1,000‹C. The metal(s) may be precipitated from the molten salt by the use of the precipitants simultaneously or sequentially e.g. by the simultaneous use of hydrogen and hydrogen sulphate followed by a nitrogen purge and the addition of an Al-Cu alloy to the molten salt contained in a separate compartment of the precipitation vessel. Nickel sulphide or chloride may be added to the molten ...

Zinc recovery process

Process for producing cobalt solution of low manganese concentration

PROCESS AND APPARATUS FOR PRODUCING METALS AT POROUS HYDROPHOBIC CATALYTIC BARRIERS

Recovery of uranium and plutonium values from aqueous solutions of ammonium fluoride,particularly from zirflex-type waste solutions

Uranium is recovered from an aqueous NH4F solution containing U and Zr by adding a soluble peroxide, e.g. 30% H2O2, to ppt. U peroxide (UO4.4H2O). The initial solution may be obtained by dissolving a Zr-clad UO2 fuel or a Zr-U alloy in 4-6 M. NH4F\sBNH4NO3, and should have a maximum U concn. of 0.001 M. The temperature of pptn. may be 25-60 DEG C., and sufficient peroxide added to make the solution 0.1-3 M. in peroxide.

Preparation of ultra-pure silver metal

Process for the utilization of vanadium from chromium ore as vanadium (V) oxide

Process for precipitating or recovering metals from their solutions

... 194,339. Bardt, H. Oct. 10, 1921. Precipitating.-Metals such as copper, silver, mercury and gold are precipitated from solutions of their salts by adding to the solution an organic material containing polysaccharides, such as straw, cellulose waste liquors, sugar, molasses, or preferably sawdust, and heating the mixture at 120-150‹ C. under pressure. In melting down the product subsequently, the adhering precipitant serves to prevent oxidation. Specification 703/07 is referred to.

Gold recovery process

Gold is recovered from solutions of alkali metal gold cyanide by treatment thereof with alkali metal or zinc hydrosulphite or hydrazine hydrate at a temperature above 150 DEG F. until precipitation of the gold has stopped, the precipitated gold then being removed. The reducing agent is present in at least equal molar concentration to that of the gold. There may be added in an amount of 0.2-20 parts by weight per part by weight of reducing agent of aldehydes, hydroxyl containing amines or acid salts thereof, alkali metal alkanoates, ammonium or alkali metal phosphates, hypophosphites or thiosulphates or amino or hydroxy carboxylic acids or their ammonium or alkali metal salts.

IMPROVEMENTS IN/RELATING TO RECOVERY OF SILVER

Improvements in or relating to the recovery of metals from saline solutions

Metals are recovered, in the form of metal-protein complexes froman aqueous solution containing dissolved salts of the metals by adding to the solution, e.g. at 60-140 DEG F., a reagent comprising lower molecular weight proteinaceous compounds produced by the enzymatic degradation of higher molecular weight proteinaceous compounds, to precipitate the complexes, and recovering the precipitate The precipitate may be pyrolysed to remove organic matter. The aqueous solution may be sea water or a bittern which may be subjected to partial evaporation to obtain one or more yields of sodium chloride which yields are separated before treating the solution with the reagent. Metals which may be recovered are iron, aluminium, silicon, cobalt, titanium, copper, lead, vanadium, manganese, chromium, germanium, gold, molybdenum, zinc, nickel, silver, magnesium, strontium, calcium and potassium. The proteinaceous reagent may be recovered from the enzymatic degradation of vegetation composts, bunnus, animal ...

Process and apparatus for the recovery of metals from liquid media

A process for recovering a metal contained in a liquid medium, in the form of a complex salt, comprises incorporating a reducing agent such as formaldehyde with the liquid medium and contacting the medium at a pH of at least 10 with a metal surface, preferably a refined steel surface, so that metal contained in the medium is deposited on the metal surface. The liquid medium may be a waste liquor, for example excess electrolyte from an electroplating process and may contain a complex copper-salt with ethylene diamine tetra-acetic acid. The metal deposited on the metal surface may be recovered by anodic dissolution for recycling, and the complexing agent in the liquid medium may be recovered by acidifying the medium for example by addition of sulphuric acid.

PROCESS FOR THE PRODUCTION OF METALS

... 1455590 Metal oxides or hydrides by reduction in organic media SHELL INTERNATIONAL RESEARCH MAATSCHAPPIJ BV 20 Dec 1973 [22 Dec 1972] 59102/73 Heading C1A [Also in Division C7] Metal values in the form of oxides or hydrides are recovered from liquid organic media containing compounds and/or complexes of the metals by treatment with a reducing gas, wherein a fluidized bed of seed particles is maintained by passing the organic medium and/or the reducing gas at a suitable rate upwards through the bed. The seed particles are preferably metal powders of less than 1 mm. size; the preferred reducing gas is hydrogen. The metal values are those of Groups IB, IIB, IIIA to VIIA and VIII and the compounds and/or complexes may be salts of ternary carboxylic acids although other species are also exemplified. The metal-containing organic media may be the result of extraction of the metal values from aqueous solutions into the organic phase, or by direct contact of ores with the organic medium.

Selective precipitation of nickel and cobalt

Process for the recovery of metals and hydrochloric acid

PRODUCTION OF METAL FROM MINERALS

Method and apparatus for the recovery of refractory mineral ores

Recovery of nickel and cobalt from laterite ores

Method for thiosulfate leaching of precious metal.containing materials

Method for reduction of nickel

Production of Titania.

A METHOD OF RECOVERING BASE METALS FROM LOW GRADE ORES AND RESIDUES

Process for extracting platinum group metals.

PGMs can be extracted from a source material by heat-treating the source material to form a residue containing PGMs in a cyanide leachable condition and, thereafter, cyanide leaching the resudue using a solution containing cyanide to form a pregnant cyanide leach liquor containing PGMs in solution.

Method for reduction of nickel.

The invention relates to a method for the precipitation of nickel from its aqueous solution as a metal powder using hydrogen. The aqueous solution containing nickel compounds is neutralised first with an earth alkali or alkali compound so the nickel precipitates as nickel hydroxide or as an alkaline salt, after which reduction is performed in the presence of a catalyst in ion form in atmospheric or close to atmospheric conditions preferably as a continuous process.

Method for reduction of nickel from an aqueous solution.

The invention relates to a method for the precipitation of nickel from an aqueous solution containing its sulphate as a metallic powder suitable as an alloying element for refined steel. In this method, nickel reduction takes place continuously in one or several autoclaves at a temperature of 80 - 180 degrees Celsius and hydrogen pressure of 1- 20 bar, whereby the production capacity can be raised significantly, compared to batch processes made in correspondingly dimensioned devices or equipment.

Selective precipitation of nickel and cobalt.

A method for precipitating nickel and cobalt from an acid aqueous solution containing at least dissolved nickel, cobalt and manganese, the method including: adding solid caustic calcined magnesium oxide or freshly slurried caustic calcined magnesium oxide to the solution, the magnesium oxide being added in an amount sufficient to precipitate a substantial proportion of the nickel and cobalt in solution and to precipitate a minor proportion of the manganese in solution; maintaining the magnesium oxide in contact with the solution for a period of about 1 hour to about 9 hours to thereby achieve precipitation of a substantial proportion of the nickel and cobalt in solution and precipitation of a minor proportion of the manganese in solution; and separating solids precipitated in step (b) above from the aqueous solution. Preferably, about 80% to 100% of the Ni and Co in solution is precipitated and about 5% to 15% of the Mn in solution is precipitated. The precipitated material separates early ...

Production of metal from minerals

A process for production ...

Method for obtaining cobalt and nickel from ores and ore concentrates.

The invention relates to a method for obtaining metals from a cobalt and/or nickel arsenic sulfide ore or ore concentrate and/or a cobalt and/or nickel sulfide ore or ore concentrate, according to which the cobalt and/or nickel arsenic sulfide ore or ore concentrate and/or the cobalt and/or nickel sulfide ore or ore concentrate is reacted with sulfur or sulfur arsenic compounds to a reaction product, and dissolving and removing soluble metals and rare-earth metals.

A METHOD OF RECOVERING BASE METALS FROM LOW GRADE ORES AND RESIDUES

Recovery of platinum group metals

Recovery of metals from jarosite-containing materials.

A method to dissolve at least one metal from jarosite or other iron hydroxy sulfate containing-material which includes the steps of subjecting the material the material to alkaline treatment in a brine solution to facilitate jarosite decomposition, and acidification of the brine slurry to solubilise the liberated metal.

Method for thiosulfate leaching of precious metal-containing materials

Method and apparatus for the recovery of refractory mineral ores

Metal cyanide comprising aqueous solutions for thecyanide process for extracting gold and silver

PROCESS FOR RECOVERING NON-FERROUS METALS FROM A SOLID MATRIX

PRODUCTION OF METAL FROM MINERALS

Method for reduction of nickel

Method for thiosulfate leaching of precious metal-containing minerals

Method for recovering copper from sulfide ore materials using high temperature pressure leaching solvent extraction and electrowinning

Method of oxidative leaching of sulfide ores and/or concentrates

Method for reduction of nickel from an aqueous solution

Scorodite-type iron-arsenic compound particles, production method thereof, and arsenic-containing solid

Scorodite-type iron-arsenic compound particles in which the particle surface layer part comprise an iron-rich layer having an Fe/As molar ratio of at least 1.24. The particles can be obtained in a reaction process of feeding an oxygen-containing gas to an aqueous solution containing an arsenic(V) ion and an iron(II) ion to precipitate a scorodite-type iron-arsenic compound crystal at a pH of at most 2, in which an oxidizing agent is further added to the liquid before the end of the reaction (treatment A). The particles may also be obtained by a method comprising keeping a scorodite-type iron-arsenic compound particle of good crystallinity in contact with an iron ion-containing aqueous solution having a controlled pH of from 2 to 9 at 0 to 90° C. (treatment B). The scorodite-type iron-arsenic particles have good filterability and excellent arsenic release-preventing effect.

Method of manufacturing fe and ni containing material, ferronickel mass using the fe and ni containing material and method for manufacturing the ferronickel mass

A method of manufacturing an Fe/Ni-containing material having a low content of sulfur from an Fe/Ni/SO 4 -containing liquid waste, a ferronickel mass using the Fe/Ni-containing material, and a method of manufacturing the ferronickel mass. The method includes: removing SO 4 from an Fe/Ni/SO 4 -containing liquid waste by adding an SO 4 neutralizing agent to the liquid waste so that pH of the liquid waste can be maintained to a pH level of 0.5 to 2.5; precipitating Fe and Ni in the form of hydroxide [(Ni,Fe)(OH)] by adding NaOH to the SO 4 -free solution; washing the precipitate with water; and manufacturing an Ni/Fe-containing material by filtering and drying the washed Ni/Fe-containing sludge. The method may be useful to suitably apply to the field of recycling of waste acids since an Fe/Ni-containing pellet and a high purity plaster are recovered as the stainless steel material from the waste water at the same time.

Method for producing raw material for ferronickel smelting from low grade nickel oxide ore

Provided is a method for producing ferronickel from a nickel sulfide or a mixed sulfide containing nickel and cobalt, obtained by hydrometallurgy of nickel oxide ore or obtained from scraps or products in process. The method for producing a ferronickel raw material is to form the ferronickel raw material from a nickel sulfide or a mixed sulfide containing nickel sulfide and cobalt sulfide, wherein treatments are performed through the following steps: (1) redissolution step, (2) deferrization step, (3) solvent extraction step, (4) hydroxylation step, (5) roasting step, and (6) washing and calcining step.

Method for economical extraction of lithium from solution including lithium

The present invention relates to a method of extracting lithium from a lithium bearing solution. More specifically, the present invention provides a method of economical extraction of lithium from a lithium bearing solution by adding a phosphorous supplying material to the solution to precipitate lithium phosphate from the dissolved lithium.

SYSTEM AND METHOD FOR PARALLEL SOLUTION EXTRACTION OF ONE OR MORE METAL VALUES FROM METAL-BEARING MATERIALS

The present disclosure relates to a process and system for recovery of one or more metal values using solution extraction techniques and to a system for metal value recovery. In an exemplary embodiment, the solution extraction system comprises a first solution extraction circuit and a second solution extraction circuit. A first metal-bearing solution is provided to the first and second circuit, and a second metal-bearing solution is provided to the first circuit. The first circuit produces a first rich electrolyte solution, which can be forwarded to primary metal value recovery, and a low-grade raffinate, which is forwarded to secondary metal value recovery. The second circuit produces a second rich electrolyte solution, which is also forwarded to primary metal value recovery. The first and second solution extraction circuits have independent organic phases and each circuit can operate independently of the other circuit. 1. A process comprising:feeding a first metal-bearing solution to a first solution extraction circuit and a second solution extraction circuit;feeding a second metal-bearing solution to the first solution extraction circuit; andproducing an aqueous raffinate from the first solution extraction circuit.2. The process of claim 1 , wherein the first metal-bearing solution is a high-grade pregnant leach solution.3. The process of claim 1 , wherein the second metal-bearing solution is a low-grade pregnant leach solution.4. The process of claim 1 , wherein the first metal-bearing solution and second metal-bearing solution comprise copper.5. The process of claim 1 , wherein the first solution extraction circuit produces a first rich electrolyte solution.6. The process of claim 3 , wherein the aqueous raffinate is produced from an extractor of the first solution extraction circuit.7. The process of claim 6 , wherein the aqueous raffinate is low-grade raffinate.8. The process of claim 7 , wherein the low-grade raffinate comprises a secondary metal value.9. ...

Process for extracting aluminum from aluminous ores

There is provided a method for extracting aluminum ions from argillite. The process comprises leaching the argillite with an acid such as HCl so as to obtain a composition comprising the aluminum ions and iron ions; at least partially removing the iron ions from the composition by substantially selectively precipitating the iron ions by adding a base and at least partially removing the precipitated iron ions so as to obtain an Al-rich composition; and optionally purifying the Al-rich composition by adding a base for substantially selectively precipitating the aluminum ions, by means of a hollow fiber membrane, or by a liquid-liquid extraction.

Methods Of Metal Extraction Using Oximes

Provided are methods method of recovering metal from an aqueous solution, the method comprising contacting an aqueous solution containing at least two metals selected from molybdenum, cobalt, nickel, zinc and iron with an organic solvent and an oxime-containing reagent composition at a predetermined pH, the predetermined pH selected to provide a high first metal extraction and a low second metal extraction; and separating the first metal from the solution. 6. The method of wherein the ketoxime and aldoxime are present in a molar ratio of ketoxime to aldoxime ranging from about 85:15 to about 25:75.7. The method of claim 6 , wherein the ketoxime and aldoxime are present in a molar ratio of ketoxime to aldoxime is about 70:30.8. The method of wherein the ketoxime and aldoxime are present in a molar ratio of ketoxime to aldoxime ranging from about 85:15 to about 25:75.9. The method of claim 8 , wherein the ketoxime and aldoxime are present in a molar ratio of ketoxime to aldoxime is about 70:30.10. The method of claim 1 , wherein the predetermined pH ranges from 1 to 7.11. The method of claim 1 , wherein the pH is adjusted using sulfuric acid or aqueous ammonium hydroxide solution. This application is a divisional application of U.S. application Ser. No. 13/401,939, filed Feb. 22, 2012, which claims priority to U.S. Provisional Patent application No. 61/446,878, filed on Feb. 25, 2011, the contents of both of which are incorporated herein by reference in their entirety.The present invention relates generally to the field of extractive metallurgy. In particular, the present invention relates to metal solvent extraction methods and reagents.Copper and its metal alloys have been used for thousands of years. The importance of copper, as well as a variety of other metals, has led to a continuing search for more efficient and productive procurement methods. One method of copper extraction is a process of leaching, coupled together with solvent extraction, and finally copper ...

Precipitation of Antimony and Bismuth from Copper Refinery Electrolyte Using PbO2

The invention is suitable for use in metal and nonmetal mining and in general, in any area of operation containing Sb and Bi in solution in an electrolyte based mainly on sulfuric acid. The system consists in contacting solid lead dioxide (PbO), which can be activated superficially with an oxidizing agent, for example hydrogen peroxide (HO), to increase its reactivity, with an acid electrolyte that contains Sb and Bi in solution, with the purpose of causing a decrease in the content of soluble Sb and Bi present in the liquid phase, forming insoluble compounds based on Pb—Sb and Pb—Bi. With this invention the presence of Sb and Bi in solution is reduced by at least 70%. 1. A method for decreasing the content of soluble antimony and bismuth in an electrolyte CHARACTERIZED because it comprises putting in contact lead dioxide with an acid electrolyte that contains antimony and bismuth in solution , yielding insoluble compounds based on Pb—Sb and Pb—Bi.2. A method for decreasing the content of soluble antimony and bismuth in an electrolyte according to claim 1 , CHARACTERIZED because the lead dioxide is in the form of particles.3. A method for decreasing the content of soluble antimony and bismuth in an electrolyte according to claim 1 , CHARACTERIZED because the lead dioxide can or cannot be previously activated superficially with an oxidizing agent claim 1 , for example hydrogen peroxide (HO) claim 1 , to improve its extraction capacity.4. A method for decreasing the content of soluble antimony and bismuth in an electrolyte according to CHARACTERIZED by the formation of insoluble Pb—Sb based compounds and Pb—Bi compounds.5. A method for decreasing the content of soluble antimony and bismuth in an electrolyte according to CHARACTERIZED by allowing the reuse of the particulate system for the precipitation of antimony more than two times.6. A method for decreasing the content of soluble antimony and bismuth in an electrolyte according to and claim 1 , CHARACTERIZED by ...

METHOD FOR TREATING LIQUID EFFLUENTS AND RECOVERING METALS

A method for treating liquid effluents and recovering metals is described, which comprises the steps of: a) liquid effluent equalization; b) sulphide addition and precipitation of metals in the form of metal sulphides; c) solid/liquid separation of the metal sulphides produced in step (b) and formation of a metal-free liquid phase; d) addition of a 50 to 250 g/L amine solution to the liquid phase precipitating magnesium in the form of magnesium hydroxide (Mg(OH)2); and e) recovery of amine by stripping and rectification. 1. A process for treating liquid effluents and recovering metals , comprising the steps of:a) equalizing a liquid effluent;b) adding sulfides and metal precipitation in the form of metal sulfides;c) separating solid/liquid from the metal sulfides obtained in step (b) and forming a liquid phase free of metals;d) adding amine solution in the ratio of 50 to 250 g/L to the liquid phase with magnesium precipitation in the form of magnesium hydroxide —Mg(OH)2; ande) recovering the amine by depletion and rectification.2. The process of claim 1 , wherein in step (d) adding the amine solution to the liquid phase occurs at a temperature of 25 to 70° C. claim 1 , solid content of 1 to 10% p/p claim 1 , residence time of 0.5 to 2 hours and recycle ratio of slurry of 5 to 40:1.3. The process of claim 1 , wherein in step (d) the amine added comes from currents of recovered amine and replacement amine.4. The process of claim 1 , wherein after step (d) and before step (e) a slurry of magnesium hydroxide precipitate is conducted to a thickener.5. The process of claim 4 , wherein magnesium hydroxide is withdrawn from the thickener claim 4 , transferred to a solid/liquid separator and washed with water.6. The process of claim 5 , wherein the washed magnesium hydroxide is subject to a step of drying and calcination forming magnesia.7. The process of claim 1 , wherein in step (e) claim 1 , the amine depletion is done by heating by low pressure steam claim 1 , preferably ...

Method for treating arsenic containing materials

A method for selectively removing arsenic from a sulphide material containing arsenic by conducting a leaching step that includes contacting the material with a leaching solution that leaches arsenic from the material to form a pregnant liquor containing dissolved arsenic and a solid of a sulphide material of reduced arsenic content, and subsequently separating the solid from the pregnant liquor. The fresh leaching solution that is provided to the leaching step is an alkaline solution having a sulphide-containing compound present in an amount of from 0 to 1.0 times the amount of sulphur containing compound required to react with the arsenic present in the material.

METHOD FOR SEPARATING IMPURITIES FROM AN ACIDIC SOLUTION CONTAINING NICKEL AND COBALT AND/OR SCANDIUM

Provided is a method for efficiently separating nickel, cobalt and/or scandium, and impurities from an acidic solution containing impurities such as manganese, iron, zinc, and aluminum. A valuable-metal extracting agent of the present invention is expressed by general formula (1). In the formula, Rand Reach represent the same or different alkyl groups, Rrepresents a hydrogen atom or an alkyl group, and Rrepresents a hydrogen atom or a given group, other than an amino group, that bonds with an α carbon as an amino acid. In general formula (1), the inclusion of a glycine unit, a histidine unit, a lysine unit, an asparagine acid unit, or a normal methylglycine unit is preferred. 2. The method according to claim 1 , wherein the amide derivative is any one or more of glycinamide derivatives claim 1 , histidinamide derivatives claim 1 , lysinamide derivatives claim 1 , aspartamide derivatives claim 1 , and N-methylglycine derivatives.3. The method according to claim 1 , whereinthe acid solution contains nickel and zinc, andthe acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 or higher to 4.3 or lower.4. The method according to claim 1 , whereinthe acid solution contains nickel and iron,when the iron is trivalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.0 or higher to 3.2 or lower, andwhen the iron is divalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 or higher to 4.5 or lower.5. The method according to claim 1 , whereinthe acid solution contains cobalt and iron,when the iron is trivalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.0 or higher to 4.0 or lower, andwhen the iron is divalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid ...

METHOD FOR RECOVERING RHENIUM, METHOD FOR SELECTIVELY RECOVERING RHENIUM FROM SOLUTION INCLUDING RHENIUM AND OTHER METALS, AND METHOD FOR INCREASING CONTENT RATIO OF RHENIUM IN SOLUTION INCLUDING RHENIUM AND OTHER METALS

A method is provided which can separate rhenium from a solution containing rhenium by a simple procedure in a shorter time. A method of selectively recovering rhenium from a solution containing rhenium and one or more different metals is also provided. A method of recovering rhenium is used. The method involves (A) adding an electron donor (aliphatic secondary alcohol or aliphatic secondary thioalcohol) and a ketone compound to a solution containing perrhenate ions, (B) irradiating the solution after the addition step with ultraviolet light to precipitate a reduced species of the perrhenate ions contained in the solution, and (C) separating the reduced species of perrhenate ions from the solution, the reduced species being precipitated during the ultraviolet light irradiation. 1. A method of recovering rhenium , comprising:(A) adding an electron donor and a ketone compound to a solution containing perrhenate ions, the electron donor being an aliphatic secondary alcohol or an aliphatic secondary thioalcohol,(B) irradiating the solution after the addition with ultraviolet light to precipitate a reduced species of the perrhenate ions contained in the solution, and(C) separating the reduced species of the perrhenate ions from the solution, the reduced species being precipitated during the ultraviolet light irradiation,wherein the pH of the solution is 6.3 or higher during step (B).2. (canceled)3. The method of recovering rhenium according to claim 1 ,wherein the electron donor is an aliphatic secondary alcohol.4. The method of recovering rhenium according to claim 1 ,wherein the electron donor is 2-propanol.5. The method of recovering rhenium according to claim 1 ,wherein the ketone compound is acetone.6. A method of selectively recovering rhenium from a solution containing rhenium and one or more different metals claim 1 , comprising:adding an electron donor and a ketone compound to a solution containing perrhenate ions and a co-existing metal other than alkali metals ...

Method and system for gold recovery

A method for recovering precious metal from an acidic pregnant solution resulting from halogen or hypohalite leaching of an ore, comprising lowering the ORP of the pregnant leachate with a reducing agent in the presence of slurried non-carboneous particles. The precious metal deposits on the surfaces of the particles and a barren solution comprising substantially all the halogen values of the pregnant solution in the form of sodium chloride, sodium bromide or hypohalites is recovered.

Platinum group metal refining

A process for refining platinum group metals (PGM) first removes concentrations of base metals (BM) from the PGM through precipitation of the BM by increasing alkalinity in the dissolving aqueous solution. A large fraction of the aqueous solution is distilled before increasing alkalinity. Os is recovered from the distillate The aqueous solution is heated following precipitation of the BM; and the PGM is loaded on borane containing reduction resins. The loaded resins are washed; and the PGM is stripped from the resins with gaseous oxygen. The stripped PGM are then processed using only substituted quaternary ammonium salt (SQAS) as the refining reagent. The waste solutions from the refining are all combined together; solvent is removed; residual PGM is recycled in the process; and concentrated SQAS is recovered for further refining. Pt, Pd and Ru are refined from acidic SQAS solutions by reducing the metals from the solutions with H 2 .

MOLYBDENUM RECOVERY FROM AQUEOUS NITRIC ACID SOLUTION BY SOLVENT EXTRACTION

The invention provides a method for extracting transition metals, the method comprising supplying a feedstream containing transition metal, mixing the feedstream with nitric acid for a time and at a concentration sufficient to form an aqueous phase containing the transition metal, combining the aqueous phase with organic extractant phase for a time and at a concentration sufficient to cause the transition metal to reside within the organic extractant phase, and combining the transition metal-containing organic extractant phase with an hydroxamic acid-containing aqueous phase at a concentration and for a time sufficient to cause the transition metal to reside in the hydroxamic acid-containing aqueous phase. 1. A method for extracting transition metals , the method comprising:a supplying a feed stream containing transition metal;b mixing the feed stream with nitric acid for a time and at a concentration sufficient to form an aqueous phase containing the transition metal;d combining the aqueous phase with organic extractant phase for a time and at a concentration sufficient to cause the transition metal to reside within the organic extractant phase; ande combining the transition metal-containing organic extractant phase with an hydroxamic acid-containing aqueous phase at a concentration and for a time sufficient to cause the transition metal to reside in the hydroxamic acid-containing aqueous phase.2. The method as recited in wherein the step of combining the aqueous phase with organic extractant phase causes at least about 96 percent of impurities within the feedstream to reside in the aqueous phase.3. The method as recited in wherein the step of combining the metal-containing organic extractant phase with an hydroxamic acid causes impurities to remain in the organic extractant phase.4. The method as recited in wherein the transition metal residing in the hydroxamic acid-containing aqueous phase is a cation of a salt or a molybdenum-AHA complex.5. The method as ...

System for extracting vanadium from leaching solution containing vanadium chromium silicon and for preparing vanadium pentoxide and processing method therefor

A system for extracting vanadium from a leaching solution containing vanadium chromium silicon and for preparing vanadium pentoxide, and a method therefor, the system comprising, in sequence: an impurity removal system, an extraction system, a reverse-extraction and vanadium precipitation system, a washing system and a calcining system. The method comprises the following steps: removing silicon in a leaching solution by using a silicon removal agent, extracting most of the vanadium to an organic phase by using centrifugal extraction, reverse-extracting the vanadium of a vanadium-rich organic phase by using a mixed solution containing a basic solution and an ammonium salt, and precipitating ammonium metavanadate to obtain an ammonium metavanadate solid, washing and drying, and then calcining at a certain temperature to obtain a low chromium, low silicon, low aluminum and high-purity vanadium pentoxide product.

PROCESS OF EXTRACTING GOLD AND SILVER FROM ORES AND MINING BY-PRODUCTS

The invention relates to a process for the extraction of gold and silver from ores and mining by-products. The process according to invention consists in treating ores and mining residues having a content of 0.5 . . . 12 ppm Au with a solution of ammonium thiosulphate, recycled at a temperature of 15-25° C.; the filtrate resulting after solubilization is subjected to an electrolytic extraction with high-alloy electrodes with a current density of 200 . . . 250 A/m, until the electrolyte reach a concentration of 5-15 ppm Au, 1-100 ppm Ag and 0.1-1.0 g/1 Cu; afterwards, the separated cement is filtered off and dissolved in aqueous ammonia, dried at a temperature of 105° C. and melted at a temperature of 1200° C., resulting a Au-Ag alloy, which is processed by electrochemical and thermal refining operations, from which there are obtained Au and Ag of high purity. 1{'sub': 4', '2', '2', '3', '4, 'solubilizing the raw material in a solution of ammonium thiosulphate, recycled from the process, with a content of 10 to 25 g/l (NH)SO; 0.1 to 1.0 g/l Cu; 0.3 to 0.4 g/l NHOH at a solid:liquid ratio of 1:1 . . . 1:1.5, at a temperature of 15-25° C. for 2-4 hours;'}{'sub': 4', '2', '2', '3', '4, 'sup': '2', 'the filtrate obtained after dissolution, with a content of 10 to 25 g/l (NH)SO, 6-20 ppm Au, 2-150 ppm Ag, 0.12-1,2 g/l Cu, 0.3-0.4 g/l NHOH, is subjected to an electrolysis with high-alloy steel electrodes with a current density of 200-250 A/m, until the electrolyte has a concentration of 5-15 ppm Au, 1-100 ppm Ag and 0.1-1.0 g/l Cu;'}the cementum separated in electrolysis cells, after a total of 20 cycles, is filtered off and dissolved in aqueous ammonia having a concentration of 20% NH 3 at a solid:liquid ratio of 1:51:10 for 3-5 hours; after which it is filtered, washed with water, dried at a temperature of 105° C. and melted in a alkaline-reducing medium at a temperature of 1,200° C., resulting a Au—Ag alloy, from which, by electrochemical and thermal refining, there are ...

METHOD FOR PRODUCING NICKEL SULFIDE AND HYDROMETALLURGICAL METHOD FOR NICKEL OXIDE ORE

Provided is a method for producing nickel sulfide from an acidic sulfuric acid solution containing nickel, which is capable of suppressing particle diameters of nickel sulfide obtained thereby. The present invention is a method for producing nickel sulfide by causing a sulfurization reaction by blowing a hydrogen sulfide gas into an acidic sulfuric acid solution containing nickel, wherein: nickel sulfide having particle diameters of 5-20 μm and serving as seed crystals is added into an acidic sulfuric acid solution having a nickel concentration of 0.5-5.0 g/L in an amount of 40-500% by mass relative to the amount of nickel contained in the acidic sulfuric acid solution; and a hydrogen sulfide gas is blown into the acidic sulfuric acid solution, into which the seed crystals have been added, while setting the amount of the hydrogen sulfide gas blown in to be within the range of 0.30-0.85 Nm/kg-Ni. 1. A method for producing nickel sulfide , the method comprising obtaining nickel sulfide by blowing hydrogen sulfide gas into an acidic solution of sulfuric acid containing nickel to cause a sulfidization reaction , whereinnickel sulfide having a particle diameter of from 10 to 60 μm is recovered byusing a plurality of sulfidization reaction tanks,adding nickel sulfide having a particle diameter of from 5 to 20 μm as a seed crystal to the acidic solution of sulfuric acid having a nickel concentration of from 0.5 to 5.0 g/L in an amount to be at a proportion of from 40 to 500% by mass with respect to an amount of nickel contained in the acidic solution of sulfuric acid in a first sulfidization reaction tank for initially causing a sulfidization reaction, and{'sup': '3', 'adjusting a blow quantity of hydrogen sulfide gas to be blown into the first sulfidization reaction tank to from 0.33 to 0.82 Nm/kg-Ni.'}2. (canceled)3. The method for producing nickel sulfide according to claim 1 , whereinnickel sulfide having a particle diameter of from 15 to 55 μm is recovered byadding ...

SYSTEM AND METHOD INCLUDING MULTI-CIRCUIT SOLUTION EXTRACTION FOR RECOVERY OF METAL VALUES FROM METAL-BEARING MATERIALS

The present disclosure relates to a metal recovery process comprising a solvent extraction process. In an exemplary embodiment, the solution extraction system comprises a plant with a first and second circuit. A high-grade pregnant leach solution (“HGPLS”) is provided to the first and second circuit, and a low-grade pregnant leach solution (“LGPLS”) is provided to the second circuit. The first circuit produces a rich electrolyte, which can be forwarded to a primary metal recovery, and a low-grade raffinate, which can be forwarded to a secondary metal recovery process. The second circuit produces a rich electrolyte, which can also be forwarded to the primary metal recovery process. The first and second circuits are in fluid communication with each other. 1. A system for extracting metal value comprising:a first metal-bearing solution;a second metal-bearing solution; anda solution extraction plant comprising a first circuit and a second circuit,wherein the first circuit comprises at least two first circuit extractors and at least one first circuit stripping unit, and wherein the second circuit comprises at least two second circuit extractors and at least one second circuit stripping unit, and wherein the first circuit and second circuit are in fluid communication with each other.2. The system of claim 1 , wherein the first metal-bearing solution is a high-grade pregnant leach solution.3. The system of claim 1 , wherein the second metal-bearing solution is a low-grade pregnant leach solution.4. The system of claim 1 , wherein a first portion of the first metal-bearing solution is provided to the first circuit claim 1 , a second portion of the first metal-bearing solution is provided to the second circuit claim 1 , and the second metal-bearing solution is provided to the second circuit.5. The system of claim 1 , wherein the first metal-bearing solution and second metal-bearing solution comprise copper.6. The system of claim 1 , wherein the first circuit is configured to ...

CONTINUOUS SOLVENT EXTRACTION PROCESS FOR GENERATION OF HIGH GRADE RARE EARTH OXIDES FROM LEACHATES GENERATED FROM COAL SOURCES

A continuous solvent extract process is provided for concentrating rare earth elements from leachates generated from coal sources. The process involves solvent extraction which utilizes an organic extractant mixed into an organic solvent. 1. A method of recovering rare earth elements from an aqueous coal source leachate , comprising:contacting, in a roughing circuit, rare earth elements in the aqueous coal source leachate with an organic phase to extract the rare earth elements into an organic phase and contaminants in an aqueous phase;scrubbing, in the roughing circuit, additional contaminants from the organic phase;stripping, in the roughing circuit, the rare earth elements from the organic phase; andrecovering the rare earth elements in a rare earth element containing solution.2. The method of claim 1 , including using an organic extractant in the organic phase to provide preferential extraction of the rare earth elements from the aqueous coal source leachate.3. The method of claim 2 , including completing the contacting at an operating pH of between 0.5 and 3.5.4. The method of claim 1 , including using a first acid to selectively scrub the additional contaminants from the organic phase at a first pH.5. The method of claim 4 , including using a second acid to strip the rare earth elements from the organic phase at a second pH wherein said second pH Подробнее

Process for the recovery of metals from polymetallic nodules

The present disclosure concerns a process for the recovery of valuable metals from polymetallic nodules. A two-stage process using SO2 in an acidic aqueous media is disclosed. In a first step, performed in mildly acidic conditions, Mn, Ni, and Co are dissolved; in a second, more acidic step, Cu is dissolved. Under these conditions, the leachate of the first step contains most of the Mn, Ni, and Co, while being nearly Cu-free. The Ni and Co are precipitated as sulfides; the Mn can be recovered as sulfate by crystallization. Cu, which is leached in the second step, is secretively precipitated, also as sulfide.

METHOD FOR SYNTHESIS OF A BIOPOLYMER DERIVATIVE, A BIOPOLYMER DERIVATIVE AND ITS USE

The invention relates to a method of synthesis of a biopolymer derivative, preferably a chitosan derivative, comprising the formation of a peptide bond. The invention also relates to the biopolymer derivative, and use of the biopolymer derivative, preferably a chitosan derivative. The biopolymer derivative has broad uses in the industry, environmental protection and can be used in pharmaceutical and cosmetic compositions. The invention also relates to a composition for prevention of symptoms of allergy caused by heavy metals, especially palladium, cobalt, chromium and gold, in particular nickel. 1. A derivative of an insoluble biopolymer , wherein said biopolymer contains reactive amine or carboxyl groups , characterized in that said derivative is modified with a modifier molecule with the formation of a peptide bond.2. The derivative of claim 1 , wherein the biopolymer is a poly/oligosaccharide claim 1 , preferably chitosan.3. The derivative of or claim 1 , wherein the peptide bonds are present between amine groups of units of poly(2-deoxy-2-aminoglucose) claim 1 , and available carboxyl groups of modifier molecules.4. The derivative of any of - claim 1 , wherein the modifier molecule containing a carboxyl group is selected from carboxylic acids claim 1 , amino acids claim 1 , amino acid analogues claim 1 , dipeptides claim 1 , tripeptides claim 1 , tetrapeptides claim 1 , longer peptides claim 1 , peptidomimetics claim 1 , proteins and protein mimetics or any mixture thereof.5. A method for synthesis of an insoluble biopolymer derivative comprising forming a peptide bond between an amine or carboxyl group of a unit in the biopolymer containing reactive amine or carboxyl groups claim 1 , and one of the available carboxyl or amine groups of the modifier molecule being attached.6. The method of claim 5 , comprising:a) reacting a modifier molecule with Fmoc-Cl in a suitable solvent, preferably dioxane;b) dissolving Fmoc-modifier molecule in a solvent, preferably DMF, ...

SYSTEM AND METHOD INCLUDING MULTI-CIRCUIT SOLUTION EXTRACTION FOR RECOVERY OF METAL VALUES FROM METAL-BEARING MATERIALS

The present disclosure relates to a metal recovery process comprising a solvent extraction process. In an exemplary embodiment, the solution extraction system comprises a plant with a first and second circuit. A high-grade pregnant leach solution (“HGPLS”) is provided to the first and second circuit, and a low-grade pregnant leach solution (“LGPLS”) is provided to the second circuit. The first circuit produces a rich electrolyte, which can be forwarded to a primary metal recovery, and a low-grade raffinate, which can be forwarded to a secondary metal recovery process. The second circuit produces a rich electrolyte, which can also be forwarded to the primary metal recovery process. The first and second circuits are in fluid communication with each other. 1. (canceled)2. A method of extracting a metal value comprising:providing a first metal-bearing solution to a first circuit of a solution extraction plant;providing a second metal-bearing solution to a second circuit of the solution extraction plant, wherein the first circuit comprises at least two first circuit extractors and at least one first circuit stripping unit, and wherein the second circuit comprises at least two second circuit extractors and at least one second circuit stripping unit, and wherein the first circuit and the second circuit are in fluid communication.3. The method of claim 2 , wherein the first metal-bearing solution is a pregnant leach solution comprising a higher concentration of metal than the second metal-bearing solution.4. The method of claim 2 , wherein a first portion of the first metal-bearing solution is provided to the first circuit claim 2 , a second portion of the first metal-bearing solution is provided to the second circuit claim 2 , and the second metal-bearing solution is provided to the second circuit.5. The method of claim 2 , wherein the first metal-bearing solution and the second metal-bearing solution comprise copper.6. The method of claim 2 , wherein the first circuit ...

Method for controlling the concentration of impurities in bayer liquors

A method for controlling the concentration of impurities in Bayer liquors, the method comprising the steps of adding an oxide and/or a hydroxide of a metal other than aluminium to a Bayer liquor with a desired TA; forming a layered double hydroxide; and incorporating at least one impurity in said layered double hydroxide, wherein the impurities are selected from the group comprising phosphorus, vanadium and silicon.

Method of treating wastewater

A method of treating a waste liquid includes: an aluminum dissolution step of dissolving aluminum in an acidic waste liquid and performing separation into a first treated water and a reduced heavy metal precipitate; a gypsum recovery step of adding a calcium compound to the first treated water at a liquid property of a pH of 4 or less, and performing separation into a second treated water and gypsum; an aluminum and fluorine removal step of adding an alkali to the second treated water and performing separation into a third treated water and a precipitate containing aluminum and fluorine; and a neutralization step of adding an alkali to the third treated water and performing separation into an alkali neutralization treated water and a neutralized precipitate of a heavy metal hydroxide.

OPPORTUNITIES FOR RECOVERY AUGMENTATION PROCESS AS APPLIED TO MOLYBDENUM PRODUCTION

A copper/molybdenum separation processor is provide featuring a slurry/media mixture stage configured to receive a conditioned pulp containing hydrophobic molybdenite and hydrophilic copper, iron and other minerals that is conditioned with sodium hydrosulfide together with an engineered polymeric hydrophobic media, and provide a slurry/media mixture; and a slurry/media separation stage configured to receive the slurry/media mixture, and provide a slurry product having a copper concentrate and a polymerized hydrophobic media product having a molybdenum concentrate that are separately directed for further processing. The slurry/media mixture stage include a molybdenum loading stage configured to contact the conditioned pulp with the engineered polymeric hydrophobic media in an agitated reaction chamber, and load the hydrophobic molybdenite on the engineered polymeric hydrophobic media. 139-. (canceled)40. A method for separating copper and molybdenum comprising:receiving in a slurry/media mixture stage a conditioned pulp containing hydrophobic molybdenite and hydrophilic copper, iron and other minerals that is conditioned with sodium hydrosulfide together with an engineered polymeric hydrophobic media, and providing a slurry/media mixture;receiving in a slurry/media separation stage the slurry/media mixture, and providing a slurry product having a copper concentrate and a polymerized hydrophobic media product having a molybdenum concentrate that are separately directed for further processing; anddirecting with a media recovery stage forming part of the slurry/media separation stage the slurry product having the copper concentrate to a copper concentrate filtration stage and the polymerized hydrophobic media product to a media wash stage, the copper concentrate filtration stage having filters configured to provide the copper concentrate, and wherein the copper concentrate comprises the hydrophilic copper, and the polymerized hydrophobic media product comprises the ...

METHODS FOR SYNTHESIZING SILVER NANOPLATES AND NOBLE METAL COATED SILVER NANOPLATES AND THEIR USE IN TRANSPARENT FILMS FOR CONTROL OF LIGHT HUE

Desirable methods for larger scale silver nanoplate synthesis are described along with methods for applying a noble metal coating onto the silver nanoplates to form coated silver nanoplates with a desirable absorption spectrum. The silver nanoplates are suitable for use in coatings for altering the hue of a transparent film. The hue adjustment can be particularly desirable for transparent conductive films. 1. A method for synthesizing silver nanoplates , the method comprising:gradually adding a second quantity of hydrogen peroxide to an aqueous solution of a blend of silver ions, a polycarboxylate anion, a polyfunctional hydroxide compound, a first quantity of hydrogen peroxide and a reducing agent under mixing conditions, wherein the aqueous solution has a silver ion concentration from about 0.00025 M to about 0.1M and wherein a molar ratio of the total hydrogen peroxide to reducing agent is from about 10 about 120.2. The method of wherein the polycarboxylate anion is citrate claim 1 , succinate claim 1 , citramalate claim 1 , malonate claim 1 , tartrate claim 1 , isocitrate claim 1 , cis-aconate claim 1 , tricarballylate or a combination thereof3. The method of wherein the polyfunctional hydroxide compound is represented by the formula RC(OH) RRwhere Ris a moiety with a hydroxyl group claim 1 , ester groups claim 1 , ether groups claim 1 , aldehyde groups claim 1 , carboxylic acid group claim 1 , ketone groups claim 1 , heterocyclic groups claim 1 , amino groups claim 1 , amide groups or a plurality thereof claim 1 , and Rand Rare independently H or an alkyl moiety optionally with a hydroxyl group claim 1 , ester group claim 1 , ether group claim 1 , aldehyde group claim 1 , carboxylic acid group claim 1 , ketone group claim 1 , heterocyclic group claim 1 , amino group claim 1 , amide group or a plurality thereof claim 1 , in which the R claim 1 , Rand Rmoieties have a carbon atom bonded to the C(OH) group with the indicated functional group claim 1 , if present ...

HYDROMETALLURGICAL PROCESS FOR NICKEL OXIDE ORE

Provided is a hydrometallurgical process for nickel oxide ore using high pressure acid leaching to be capable of achieving improvement of durability of production facilities, simplification of the production facilities, suppression of the cost and environmental risks caused by compression of the volume of a tailings dam that stores wastes, and separation and recovery of impurity components which can be utilized as a resource. The hydrometallurgical process for nickel oxide ore of recovering nickel and cobalt using the high pressure acid leaching is characterized by including at least one step selected from step (A) (a step of separating and recovering chromite particles), step (B-1) (a step of neutralizing a leachate with a magnesium-based neutralizing agent), and step (B-2) (a step of neutralizing a leach residue slurry with the magnesium-based neutralizing agent). 1. A hydrometallurgical process for nickel oxide ore of recovering nickel and cobalt using a high pressure acid leaching that includes an ore processing step , a leaching step , a solid-liquid separation step , a neutralization step , a zinc removal step , a sulfurization step , and a final neutralization step , the process comprising at least one step selected from the following step (A) , step (B-1) , and step (B-2):Step (A): separating and recovering chromite particles in an ore slurry produced in the ore processing step, by a recovery process including a specific gravity separation;Step (B-1): neutralizing a leachate with a magnesium-based neutralizing agent, the leachate being produced by subjecting the ore slurry that has a chromium grade lowered through the step (A), to the leaching step and the solid-liquid separation step; andStep (B-2): neutralizing a leach residue slurry with a magnesium-based neutralizing agent to recover hematite particles, the leach residue slurry being produced by subjecting the ore slurry that has a chromium grade lowered through the step (A), to the leaching step and the ...

METHOD FOR REMOVING IRON FROM IRON-CONTAINING SOLUTION AND METHOD FOR RECOVERING VALUABLE METALS

The present invention provides a method for removing iron from an iron-containing solution containing an iron ion, comprising adding a lithium ion battery cathode material containing manganese to an acidic sulfuric acid solution to obtain a cathode material-containing solution, and then precipitating a manganese ion as manganese dioxide in a mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution while precipitating the iron ion contained in the iron-containing solution as a solid. 1. A method for removing iron from an iron-containing solution containing an iron ion , comprising:adding a lithium ion battery cathode material containing manganese to an acidic sulfuric acid solution to obtain a cathode material-containing solution, and then precipitating a manganese ion as manganese dioxide in a mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution while precipitating the iron ion contained in the iron-containing solution as a solid.2. The method for removing iron from the iron-containing solution according to claim 1 , wherein an iron ion concentration in the iron-containing solution is from 50 mg/L to 1 g/L.3. The method for removing iron from the iron-containing solution according to claim 1 , wherein a pH of the mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution is from 1 to 2.4. The method for removing iron from the iron-containing solution according to claim 1 , wherein an ORP value of the mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution is 900 mV or more.5. The method for removing iron from the iron-containing solution according to claim 1 , wherein hydrogen peroxide water is added when the cathode material containing manganese is leached.6. The method for removing iron from the iron-containing solution according to claim 1 , wherein ...

RECOVERY OF GOLD FROM SOLUTION

A method is disclosed for recovering gold from a gold-containing organic solution containing soluble gold. The method comprises contacting the gold-containing organic solution with an aqueous stripping solution in order to extract gold from the gold-containing organic solution into the aqueous stripping solution. The aqueous stripping solution containing gold is separated from the organic solution. The separated aqueous stripping solution containing gold is contacted with a reducing agent containing sodium metabisulphite, in order to reduce gold from the aqueous stripping solution. 1. A method for recovering gold from a gold-containing organic solution containing soluble gold , wherein the method comprisescontacting a pregnant leach solution containing gold with a gold extraction reagent containing organic diester and organic alcohol, in order to obtain the gold-containing organic solution;contacting the gold-containing organic solution with an aqueous stripping solution in order to extract gold from the gold-containing organic solution into the aqueous stripping solution;separating the aqueous stripping solution containing gold from the organic solution;contacting the separated aqueous stripping solution containing gold with a reducing agent containing sodium metabisulphite, in order to reduce gold from the aqueous stripping solution;wherein the aqueous stripping solution contains sodium chloride, and wherein the aqueous stripping solution is weakly acidic.2. A method according to claim 1 , wherein the method comprises recovering reduced solid gold from the aqueous stripping solution by filtering the aqueous stripping solution.3. (canceled)4. (canceled)5. A method as claimed in claim 1 , wherein the method comprises reducing gold from the aqueous stripping solution containing gold without scrubbing the gold-containing organic solution.6. A method as claimed in claim 1 , wherein the method comprises stripping the gold-containing organic solution without scrubbing ...

RECOVERY OF LITHIUM HYDROXIDE

A process for the recovery of lithium hydroxide from lithium sulfate containing solutions, the process characterised by the following method steps: 139-. (canceled)40. A process for the recovery of lithium hydroxide from lithium sulfate containing solutions , the process characterised by the following method steps:precipitating ettringite from a lithium sulfate containing solution in a primary ettringite precipitation step;subsequent recovery of a liquor containing lithium hydroxide; andproducing a lithium hydroxide monohydrate product from the lithium hydroxide liquor.41. The process of claim 40 , wherein lithium sulfate in the lithium sulfate containing solution is converted to lithium hydroxide by way of the addition of lime and an aluminium hydroxide containing reagent or mineral.42. The process of claim 41 , wherein the aluminium hydroxide containing reagent or mineral is provided in the form of refined gibbsite or bauxite ore.43. The process of claim 40 , wherein a slurry resulting from the precipitation of ettringite is subjected to a solid liquid separation step claim 40 , and optionally washing claim 40 , to recover lithium to the liquor or solution.44. The process of claim 43 , wherein a residue of the solid liquid separation step claim 43 , containing ettringite and some lithium claim 43 , is used as a neutralising agent in a preceding step utilised for the production of the lithium sulfate containing solution.45. The process of claim 43 , wherein the liquor or solution from solid liquid separation contains lithium hydroxide and some minor impurities claim 43 , the minor impurities optionally including calcium and aluminium and the minor impurities are ultimately further optionally removed by precipitation to provide a purified solution.46. The process of claim 43 , wherein the solution from solid liquid separation is passed to a secondary ettringite precipitation step.47. The process of claim 43 , wherein the solution from solid liquid separation is ...

RECOVERY OF PRECIOUS AND RARE EARTH METALS USING CYCLODEXTRIN

This invention relates to methods for the recovery of precious metals such as gold, silver, platinum, palladium and rare earths from precious metal-bearing materials. In particular, a method of purifying precious metal from a precious metal-bearing material comprising the steps a) forming an aqueous acidic oxidant mixture from hydrogen peroxide an acid and a source of bromide ion, said acidic oxidant mixture having a pH in the range 0 to 6; b) contacting the acidic oxidant mixture with the precious metal bearing-material to oxidise the metal and form a metal bromide salt solution containing the metal bromide MBrn and/or MBrnwhere n is the valency of the oxidised metal ion M; c) controlling the metal bromide salt solution to a value in the range 3-7 by providing alkali metal ions A+ in the solution to form an alkali metal/metal bromide solution containing the salt AMBrnin solution; d) adding cyclodextrin to the alkali metal/metal bromide solution to precipitate a metal cyclodextrin complex; and e) recovering the metal cyclodextrin complex. 1. A method of purifying precious metal from a precious metal-bearing material comprising the stepsa) forming an aqueous acidic oxidant mixture from hydrogen peroxide an acid and a source of bromide ion, said acidic oxidant mixture having a pH in the range 0 to 6;b) contacting the acidic oxidant mixture with the precious metal bearing-material to oxidise the metal and form a metal bromide salt solution containing the metal bromide MBrn and/or MBrn+1− where n is the valency of the oxidised metal ion Mn+;c) controlling the metal bromide salt solution to a value in the range 3-7 by providing alkali metal ions A+ in the solution to form an alkali metal/metal bromide solution containing the salt AMBrn+1 in solution;d) adding cyclodextrin to the alkali metal/metal bromide solution to precipitate a metal cyclodextrin complex; ande) recovering the metal cyclodextrin complex2. A method according to claim 1 , wherein the precious metal is ...

Nickel recovery loss reduction method, hydrometallurgical method for nickel oxidized ore, and sulfuration treatment system

A nickel recovery loss reduction method that makes it possible to reduce nickel recovery loss by lowering the concentration of fine floating solid components in overflow liquid in precipitating and separating treatments, and consequently to further reduce a nickel recovery loss, a hydrometallurgical method for nickel oxidized ore to which the nickel recovery loss reduction method is applied, and a sulfurizing treatment system. The present invention is a nickel recovery loss reduction method in a sulfurizing step for blowing hydrogen sulfide gas into a nickel containing sulfuric acid aqueous solution to generate nickel-containing sulfides and a barren liquid, and the nickel-containing sulfides with the average particle size adjusted to a predetermined size or larger are added as seed crystals to the sulfuric acid aqueous solution. It is more preferable to adjust the average particle size of the nickel sulfides to be added as seed crystals to 55 μm or more.

Treated Geothermal Brine Compositions With Reduced Concentrations of Silica, Iron, and Zinc

This invention relates to treated geothermal brine compositions containing reduced concentrations of iron, silica, and zinc compared to the untreated brines. Exemplary compositions contain concentration of zinc ranges from 0 to 300 mg/kg, concentration of silica ranges from 0 to 30 mg/kg, concentration of iron ranges from 0 to 300 mg/kg. Exemplary compositions also contain reduced concentrations of elements like lithium, manganese, arsenic, barium, and lead. Exemplary compositions include Salton Sea brines containing a concentration of zinc less than 10 mg/kg, a concentration of silica ranging from less than 10 mg/kg, and a concentration of iron less than 10 mg/kg. 1. A treated geothermal brine composition , the composition comprising a treated geothermal brine having a concentration of zinc ranging from 0 to 300 mg/kg , a concentration of silica ranging from 0 to 80 mg/kg , and a concentration of iron ranging from 0 to 300 mg/kg.2. The treated geothermal brine composition of claim 1 , wherein the concentration of zinc ranges from 0 to 300 mg/kg claim 1 , the concentration of silica ranges from 0 to 30 mg/kg claim 1 , and the concentration of iron ranges from 0 to 300 mg/kg.3. The treated geothermal brine composition of claim 1 , wherein the concentration of zinc is less than about 100 mg/kg claim 1 , the concentration of silica is less than about 30 mg/kg claim 1 , and the concentration of iron is less than about 300 mg/kg.4. The treated geothermal brine composition of claim 1 , wherein the concentration of zinc is less than about 50 mg/kg claim 1 , the concentration of silica is less than about 30 mg/kg claim 1 , and the concentration of iron is less than about 300 mg/kg.5. The treated geothermal brine composition of claim 1 , wherein the concentration of zinc is less than about 30 mg/kg claim 1 , the concentration of silica is less than about 30 mg/kg claim 1 , and the concentration of iron is less than about 300 mg/kg.6. The treated geothermal brine composition ...

PROCESS FOR THE RECOVERY OF CATHODE MATERIALS IN THE RECYCLING OF BATTERIES

A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (HPO) to said leachate and adjusting the pH to form iron phosphate (FePO) and aluminium phosphate (AlPO), precipitating and removing the formed FePOand AlPO, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium. 114-. (canceled)15. A process for removal of aluminum and iron in the recycling of rechargeable batteries , said process comprising:providing a leachate from black mass,{'sub': 3', '4, 'adding phosphoric acid (HPO) to the provided leachate,'}{'sub': 4', '4, 'adjusting the pH to form iron phosphate (FePO) and aluminum phosphate (AlPO),'}{'sub': 4', '4, 'precipitating and removing the formed FePOand AlPO, and'}forming a filtrate for recovery of cathode metals.16. The process according to claim 15 , wherein the rechargeable batteries are rechargeable lithium ion batteries.17. The process according to claim 15 , wherein the precipitation is performed in two steps at different pH levels.18. The process according to claim 17 , wherein the pH in a first precipitation step is adjusted to an interval of pH 1.5 to 4.19. The process according to claim 18 , wherein the interval of pH is either: 1.5 to 3.5 or 1.5 to 3.20. The process according to claim 17 , wherein the pH claim 17 , in a second step claim 17 , is adjusted to an interval of pH 2.5 to 6.5.21. The process according to claim 20 , wherein the interval of pH is either: 2.5 to 6 or 2.5 to 4.22. The process according to claim 17 , wherein crystallization seeds are added to precipitate FePOand AlPOin the first precipitation step.23. The process according to claim 22 , wherein the crystallization seeds comprise aluminum and iron phosphate crystals and wherein said seeds are added in an amount of 0.05-0.3 g/L.24. The process according to claim 23 , wherein the amount of added seeds is either 0.05-0.2 g/L or 0.05-0.15 g/ ...

Method for manufacturing nickel and cobalt mixed sulfide and nickel oxide ore hydrometallurgical method

Provided is a method for manufacturing a nickel and cobalt mixed sulfide that is capable of stabilizing nickel and cobalt concentrations in the sulfidation end solution at low levels and of limiting decreases in nickel and cobalt recovery rates without increasing cost even when processing with a sulfuric acid acidic solution containing nickel and cobalt and a high iron ions concentration as the sulfidation start solution. This method generates a sulfidation reaction by blowing hydrogen sulfide gas into a sulfuric acid acidic solution comprising nickel and cobalt to obtain a mixed sulfide, wherein: the sulfuric acid acidic solution, which is the sulfidation start solution, contains iron ions at a rate of 1.0-4.0 g/L; and the sulfidation reaction is generated by blowing hydrogen sulfide gas into the sulfidation start solution and adding sodium hydrogensulfide (NaHS) obtained by absorbing hydrogen sulfide gas-containing exhaust gas, generated by the sulfidation, in an alkaline solution.

METHOD OF PURIFYING YTTRIUM

A method of purifying yttrium involves purifying element yttrium by high-temperature saturated dissolution, low-temperature recrystallization, high-temperature reduction and vaporization-based removal of impurities, in a simple manner, and at a low cost, such that yttrium element is unlikely to be contaminated by any raw material used in a manufacturing process. 1. A method of purifying yttrium , comprising the steps of:A: introducing excessive yttrium oxide into nitric acid to be heated up to a first temperature and stirred, followed by filtering out minute precipitate to produce saturated yttrium nitrate solution;B: cooling the saturated yttrium nitrate solution down to a second temperature, keeping the saturated yttrium nitrate solution at the second temperature for a first duration to produce solid precipitate of yttrium nitrate from the saturated yttrium nitrate solution, followed by filtering the saturated yttrium nitrate solution to obtain a first yttrium nitrate solid;C: heating up the first yttrium nitrate solid in an atmosphere which manifests fluidity and contains hydrogen gas to a third temperature, followed by keeping the first yttrium nitrate solid at the third temperature for a second duration to reduce yttrium contained in the first yttrium nitrate solid to a metallic state and thus produce liquid yttrium; andD: changing the temperature of the liquid yttrium to a fourth temperature, followed by keeping the liquid yttrium at the fourth temperature for a third duration to evaporate and effuse an impurity otherwise contained in the liquid yttrium.2. The method of claim 1 , wherein the first temperature is 60° C.3. The method of claim 1 , wherein the second temperature is 0° C.4. The method of claim 1 , wherein the third temperature is 1580° C.5. The method of claim 1 , wherein the fourth temperature is 1530° C.6. The method of claim 1 , wherein the first duration is 30 minutes.7. The method of claim 1 , wherein the second duration is 30 minutes.8. The ...

METHODS FOR SELECTIVE LEACHING AND EXTRACTION OF PRECIOUS METALS IN ORGANIC SOLVENTS

The present application relates to methods for leaching and extraction of precious metals. For example, the present application relates to methods of leaching gold, palladium and/or platinum from a substance comprising gold, palladium and/or platinum (such as a gold-containing ore or a platinum group metal (PGM) concentrate) using an organic solvent that is water-miscible or partially water-miscible. 1. A method of leaching gold , palladium and/or platinum from a substance comprising gold , palladium and/or platinum , the method comprising contacting the substance with a mixture comprising:(a) an acid;(b) an oxidizing agent; and(c) a water-miscible or partially water-miscible organic solvent, under conditions to leach the gold, palladium and/or platinum from the substance.2. The method of claim 1 , wherein the method further comprises:separating the water-miscible or partially water-miscible organic solvent containing the leached gold, palladium and/or platinum from insoluble impurities; andevaporating the water-miscible or partially water-miscible organic solvent from the leached gold, palladium and/or platinum.5. (canceled)6. The method of claim 4 , wherein Rand Rtogether with the nitrogen atom to which they are attached form a heterocycloalkyl or a substituted heterocycloalkyl claim 4 , wherein the heterocycloalkyl is selected from aziridinyl claim 4 , azetidinyl claim 4 , pyrrolidinyl claim 4 , piperidinyl claim 4 , azepanyl claim 4 , azocanyl claim 4 , imidazolidinyl claim 4 , oxazolidinyl claim 4 , thiazolidinyl claim 4 , piperazinyl claim 4 , hexahydropyrimidinyl claim 4 , morpholinyl claim 4 , 1 claim 4 ,3-oxazinanyl claim 4 , thiomorpholinyl claim 4 , 1 claim 4 ,3-thiazinanyl claim 4 , 1 claim 4 ,3-diazepanyl claim 4 , 1 claim 4 ,3-oxazepanyl claim 4 , 1 claim 4 ,3-thiazepanyl claim 4 , 1 claim 4 ,4-diazepanyl claim 4 , 1 claim 4 ,4-oxazepanyl claim 4 , 1 claim 4 ,4-thiazepanyl claim 4 , 1 claim 4 ,3-diazocanyl claim 4 , 1 claim 4 ,3-oxazocanyl claim 4 , 1 ...

METHOD FOR THE PRODUCTION OF COBALT AND ASSOCIATED OXIDES FROM VARIOUS FEED MATERIALS

A method is disclosed for the recovery of cobalt, nickel and manganese from ores, concentrates, tailings, scrap alloys and spent batteries in an oxidic form, which is suitable for direct use in the manufacture of lithium-ion batteries, in particular. The process is unique in being able to recover cobalt, in particular, from concentrated solutions wherein the nickel to cobalt ratio is close to unity, rather than the more common 10:1 or 1:100. The process comprises selective oxidative precipitation of each metal under differing conditions of pH and ORP (oxidation-reduction potential). Sodium hypochlorite is the preferred precipitant, since it does not generate any acid, and is therefore self-buffering at the selected pH. A unique aspect of the process is to use Mn(VII) to effect the precipitation of Mn(ll). 1. A method for the recovery of cobalt from a Co- and Ni-containing aqueous solution , the method including:providing a Co- and Ni-containing aqueous solution having a pH of from about 4.5 to about 6.5 and an oxidation-reduction potential of from about 750 to about 900 mV as measured against a Pt—Ag/AgCl electrode;treating the Co- and Ni-containing aqueous solution with an amount of a hypochlorite to oxidise and precipitate a portion of the cobalt as CoOOH and form a Co-lean Ni-aqueous solution; andseparating the CoOOH from the Co-lean Ni-containing aqueous solution.2. The method of claim 1 , wherein the amount of hypochlorite is a sub-stoichiometric amount.3. The method of claim 2 , wherein the sub-stoichiometric amount of hypochlorite is sufficient to precipitate up to 90% of the cobalt as CoOOH.4. The method of claim 2 , wherein the method further includes:treating the Co-lean Ni-containing aqueous solution with an amount of hypochlorite to substantially oxidise and precipitate the remaining cobalt in the Co-lean Ni-containing aqueous solution as CoOOH and form a Co-barren Ni-containing aqueous solution; andseparating the CoOOH from the Co-barren Ni-containing ...

METHODS FOR SYNTHESIZING SILVER NANOPLATES AND NOBLE METAL COATED SILVER NANOPLATES AND THEIR USE IN TRANSPARENT FILMS FOR CONTROL OF LIGHT HUE

Desirable methods for larger scale silver nanoplate synthesis are described along with methods for applying a noble metal coating onto the silver nanoplates to form coated silver nanoplates with a desirable absorption spectrum. The silver nanoplates are suitable for use in coatings for altering the hue of a transparent film. The hue adjustment can be particularly desirable for transparent conductive films. 1. A method for applying a noble metal coating onto a silver nanoplate , the method comprising:adding gradually a coating solution comprising an aqueous solution of complexed noble metal ions and a polymer capping agent to a reaction solution comprising an aqueous dispersion of silver nanoplates, a polycarboxylate anion, a polymer capping agent, a ligand, and a reducing agent, wherein the total concentration of silver in all forms is at least about 0.75 mM.2. The method of wherein the noble metal ions comprise gold ions and/or platinum ions.3. The method of wherein the complexed noble metal ions comprise iodide ion claim 1 , bromide ion claim 1 , sulfite claim 1 , CN claim 1 , SCN claim 1 , thiosulfate claim 1 , or a mixture thereof claim 1 , as a complexing agent.4. The method of wherein the polycarboxylate anion is citrate claim 1 , succinate claim 1 , citramalate claim 1 , malonate claim 1 , tartrate claim 1 , ioscitrate claim 1 , cis-aconate claim 1 , tricarballylate or a combination thereof5. The method of wherein the capping polymer comprises polyvinylpyrrolidone.6. The method of wherein the ligand comprises nitrite claim 1 , diethyl amine claim 1 , ethylene diamine claim 1 , nitrilotriacetic acid claim 1 , iminobis(methylene phosphonic acid) claim 1 , aminotris(methylene phosphonic acid) claim 1 , ethylene diamine tetraacetic acid (EDTA) claim 1 , 1 claim 1 ,3-propylenediaminetetraacetic acid (1 claim 1 ,3-PDTA) claim 1 , triethylene tetramine claim 1 , tri(2-aminoethyl) amine claim 1 , diethylenetriaminepentaacetic acid claim 1 , 1 claim 1 ,2- ...

Co-Processing of Copper Sulphide Concentrate with Nickel Laterite Ore

A process to recover nickel, cobalt and copper by co-processing copper-containing sulphide concentrate feed containing one or more of arsenic, antimony, and bismuth, and laterite ore feed containing nickel and cobalt by pressure oxidative leaching. The sulphide concentrate and oxygen are controlled to produce sulphuric acid to leach nickel, cobalt, copper and acid soluble impurities into a liquid phase of an acidic leach slurry, to precipitate iron compounds and a majority of the arsenic, antimony and bismuth as solids, and to produce heat to heat the incoming feeds to a temperature above 230° C. Reacted slurry is withdrawn, solids are separated, and the PLS solution contains the nickel, cobalt, copper and acid soluble impurities. A first solution purification stage on the PLS neutralizes free acid, precipitates one or more of iron, aluminum, chromium and silicon, and, separates as solids, the precipitated impurities and other solids from a first purified solution. Copper is separated from the first purified solution with a solvent extraction step to produce a raffinate solution reduced in copper and a copper loaded organic phase. The organic phase is stripped and copper is recovered with electrowinning. A second solution purification stage is conducted on the raffinate by one or both of neutralizing free acid and precipitating one or more of iron, aluminum, chromium and silicon, followed by separating as solids, the precipitated impurities and other solids from a second purified solution. Nickel and cobalt are recovered as mixed hydroxides or mixed sulphides from the second purified solution. 128-. (canceled)29. A hydrometallurgical process for the recovery of nickel , cobalt and copper , comprising:a) co-processing in a pressure vessel, a feed of a copper-containing sulphide concentrate containing one or more of arsenic, antimony, and bismuth, and a feed of a laterite ore containing nickel and cobalt in a pressure oxidative leaching step under conditions including ...

Removal of Ferric Iron as Hematite at Atmospheric Pressure

A process for the removal of ferric iron as hematite from a nickel solution containing ferric and ferrous ions including the steps of: raising the temperature of the nickel solution to between 90° C. and the boiling point of the solution at atmospheric pressure; raising the pH of the nickel solution to be between 2 and 3; and adding a hematite seed to facilitate hematite precipitation, wherein ferric ions are precipitated as hematite in a predominantly crystalline form. 2. A process according to wherein the pH is raised by adding to the nickel solution a neutralizing agent wherein the neutralizing agent is limestone or saprolite.3. A process according to wherein the neutralizing agent is saprolite and the hematite seed is added at a dose of at least a weight ratio of 1:1 to the added saprolite.4. A process according to wherein limestone is used as the neutralizing agent and the hematite seed is added at a dose of 1:1 to at least 3:1 to the hematite formed during ferric ion precipitation.5. A process according to wherein the neutralizing agent is limestone which is added is in a ratio of 1:1 to 1:1.3 of the stoichiometric weight of the precipitated ferric ions.6. A process according to wherein nickel is recovered from the solution predominantly free of ferric ions claim 1 , in an ion exchange (IX) step to produce a nickel concentrated IX eluate claim 1 , and an IX raffinate containing cobalt and rejected impurities.7. A process according to wherein the IX step uses an IX resin selected from a resin having a bis-picolylamine chelating resin or iminodiacetate chelating resin.8. A process according to wherein nickel and cobalt is recovered from the solution predominantly free of ferric ions in a solvent extraction (SX) process to produce a nickel and cobalt concentrated eluate claim 1 , and an SX raffinate containing ferrous ions claim 1 , chromium claim 1 , aluminum claim 1 , manganese and magnesium.9. A process according to wherein cobalt is recovered from the IX ...

SOLVENT EXTRACTION PROCESS FOR SEPARATING COBALT FROM NICKEL IN AQUEOUS SOLUTION

A process for separating Co from Ni in an aqueous solution comprises subjecting the solution to extraction and using kinetic differences between Ni and Co in the extraction for achieving at least a partial separation of Co from Ni. This is effected by controlling the duration of the extraction so that a major portion of Co and a minor portion of Ni is extracted from the solution to produce a loaded extractant, enriched in Co and depleted in Ni compared to the feed solution, and a Co-depleted raffinate containing Ni. In a further embodiment, the invention utilizes kinetic differences between Ni and Co during striping for effecting separation of Ni and Co. The loaded extractant can be subjected to a bulk stripping or a selective stripping operation to obtain Co and Ni solutions from which Ni and Co can be recovered. The process may be incorporated in a hydrometallurgical process for the extraction of Ni and/or Co from an ore or concentrate containing Ni and Co. 1. A process for separating and recovering Co from Ni in an aqueous feed solution comprising sulphates , comprising:subjecting the feed solution comprising the sulphates and containing Ni and Co and impurities comprising Mg and Mn to extraction with an extractant and using kinetic differences between Ni and Co in the extraction by controlling duration of the extraction, thereby separating the Co from the Ni, and from the Mg and the Mn, whereby a major portion of Co and a minor portion of Ni is extracted from the feed solution to produce a loaded extractant and a Co-depleted raffinate containing Ni wherein the loaded extractant is enriched in Co and depleted in Ni compared to the feed solution, wherein the concentration of Ni in the feed solution is greater than the concentration of Co, and wherein the duration of extraction is about 30 to 240 seconds, wherein the molar ratio of (Mg+Mn):Co in the feed solution is at least 6:1.2. The process of claim 1 , wherein the feed solution is acidic.3. The process of claim ...

TREATMENT OF MANGANESE-CONTAINING MATERIALS

An improved method for treating manganese-containing materials, such as seafloor manganese nodules, by leaching such materials with aqueous HNOand polymerized nitric oxide (NO), and more particularly to methods for recovering valuable constituents from such nodules, especially manganese, cobalt, nickel, iron, and copper. It also provides a method to leach manganese-containing material to release any titanium, vanadium, cerium, molybdenum and other metals from the manganese oxides and to make them available to be recovered, as well as providing a method of producing a fertilizer grade nitrate product. 1. A method of recovering manganese from manganese-containing materials , comprising the steps of:a. obtaining manganese-containing materials having a manganese content of at least 5%;{'sub': 3', '2', '3', 'x, 'b. leaching the manganese-containing materials with HNOand polymerized nitric oxide (NO)in an aqueous solution to form MnO and to release the other metals;'}c. filtering the acid-insoluble residue from the solution leaving desired metal values in solution; andd. precipitating and recovering manganese.2. A method according to claim 1 , further comprising heating the solution during or following the leaching step to complete the formation and release of metal nitrates.3. A method according to wherein heating of the solution comprises raising the solution temperature into the range of 30 to 150° C.4. A method according to wherein the manganese-containing materials are leached in an aqueous nitric acid solution into which polymerized nitric oxide is then introduced.5. A method according to wherein the polymerized nitric oxide is introduced into the aqueous solution followed by addition of the HNOto complete the leaching reaction.6. A method according to wherein the manganese-containing material contains at least one of the elements of the group consisting of: nickel claim 1 , cobalt claim 1 , copper claim 1 , magnesium claim 1 , aluminum claim 1 , iron claim 1 , ...

PROCESS FOR EFFICIENTLY ENRICHING AND RECOVERING NOBLE METALS OF PLATINUM AND PALLADIUM BY SOLVENT EXTRACTION

The present invention relates to a process for efficiently enriching and recovering noble metals of platinum and palladium based on solvent extraction, wherein isoamyl alcohol is used as extracting agent and 2-methoxyphenyl thiourea is used as extraction-assisted complexing agent. 2-methoxy-phenyl thiourea is added to aqueous phase to react with platinum and palladium, and isoamyl alcohol is used as extracting agent to extract the organic phase, thus realizing the purpose of separating and extracting noble metals from base metals while enriching noble metals of platinum and palladium. The present invention, which can not only realize the separation of noble metals and base metals, but also enhance the enrichment and recovery ratios of noble metals of platinum and palladium, with low cost reagents, small influence on the environment and simple technical process, thus is a new and efficient extraction and enrichment system for noble metals. 1. A process for efficiently enriching and recovering noble metals of platinum and palladium based on solvent extraction , characterized in that: using isoamyl alcohol as extracting agent and 2-methoxy-phenyl thiourea as extraction-assisted complexing agent to perform enrichment and extraction of feed liquid containing noble metals of platinum and palladium , wherein the process comprises the following operation steps of:{'sup': '+', '(1) adding 2-methoxyphenyl thiourea-hydrochloric acid solution to a feed liquid containing noble metals of platinum and palladium, adjusting the acidity of the feed liquid, i.e. Hconcentration, to 3-5 mol/L, shaking well and standing as an original solution of aqueous phase; the original solution of aqueous phase containing platinum and palladium with a concentration of 0.01-5 mg/L;'}(2) taking a certain amount of isoamyl alcohol as an organic phase;(3) adding the organic phase and the original solution of aqueous phase in a volume ratio of 1:1 to 1:2.5 to a separatory funnel, shaking for 1-5 minutes, ...

METHOD FOR REMOVING RADIOACTIVE ELEMENT THORIUM IN RARE EARTH MINERAL

The present invention relates to a method for removing radioactive element thorium in a rare earth mineral, comprising: mixing the rare earth mineral with selenium dioxide in water, reacting radioactive element thorium with selenium dioxide by hydrothermal method, cooling to form a crystal, and separating the crystal to remove the radioactive element thorium. In the invention, tetravalent element thorium is selectively bound to inorganic ligand selenium dioxide in a hydrothermal environment to form a crystal, thereby achieving removal of radioactive element thorium. The method has high crystallization rate and high decontamination efficiency, and removes thorium from trivalent lanthanide element by crystallization solidification under a uniform reaction condition. Compared to a conventional industrial method for thorium separation, the method has low energy consumption and high separation ratio, enables one-step solidification separation, and effectively avoids the disadvantages of redundant separation operations and a large amount of organic and radioactive liquid wastes. 1. A method for removing radioactive element thorium in a rare earth mineral , comprising steps of:mixing the rare earth mineral with selenium dioxide in water,reacting radioactive element thorium in the rare earth mineral with selenium dioxide by a hydrothermal method,cooling the resulting solution to form a crystal, andseparating the crystal to remove the radioactive element thorium.2. The method as claimed in claim 1 , wherein the rare earth mineral comprises a lanthanide element and/or actinide element.3. The method as claimed in claim 2 , wherein a molar ratio of the lanthanide element and/or actinide element to selenium dioxide is 1: 2-10.4. The method as claimed in claim 1 , wherein the hydrothermal method includes performing the reaction at 200-230° C. for 1-3 days.5. The method as claimed in claim 1 , wherein the resulting solution is cooled to room temperature after the reaction is ...

Method of removing iron ions from a solution containing neodymium, praseodymium, dysprosium and iron

The present invention discloses a method of removing iron ions from a solution containing neodymium, praseodymium, dysprosium and iron, in which glucose is added into an acid solution containing neodymium, praseodymium, dysprosium and iron, at a molar ratio of iron/glucose at 0.2-2, and mixed evenly, and the solution is then hydrothermal treated, and after that an iron-containing precipitate is formed at the bottom, and the residual concentration of iron in the supernatant is less than 20 mg/L, and the retention rate of the rare earth elements is more than 97%. The present invention may separate iron from a solution containing neodymium, praseodymium, dysprosium and iron efficiently, which solves the pollution problem of iron to the extraction agent during the purification of the rare earth solution, and enhances the purity and utility value of the rare earth elements in the solution; the present invention is applicable to treat a rare earth solution containing a high concentration of iron or an acid solution of wastes, in which the retention rate of the rare earth elements is high, and the residual concentration of iron in the solution is low, with a simple operation and a low cost.

METHOD FOR SEPARATING COPPER, AND NICKEL AND COBALT

Provided is a method for separating copper from nickel and cobalt, which can efficiently and selectively separate copper from nickel and cobalt in a substance containing copper, nickel, and cobalt in a waste lithium ion battery, etc. In this method, a substance containing copper, nickel, and cobalt is sulfurated to obtain a sulfide, the obtained sulfide that contains copper, nickel, and cobalt is brought into contact with an acid solution to obtain a solid containing copper and a leachate containing nickel and cobalt. The sulfide preferably contains copper sulfide as a main component, and contains nickel metal and cobalt metal. In-addition, when bringing the sulfide into contact with the acid solution, the added amounts of the sulfide and the acid solution are preferably adjusted such that the oxidation-reduction potential of the obtained leachate is maintained at 150 mV or less where a silver/silver chloride electrode is a reference electrode. 1. A method for separating copper from nickel and cobalt , the method comprising:sulfurizing a material containing copper, nickel, and cobalt to obtain a sulfide; andbringing the obtained sulfide containing copper, nickel, and cobalt into contact with an acid solution to obtain a solid containing copper and a leachate containing nickel and cobalt.2. The method for separating copper from nickel and cobalt according to claim 1 , wherein the sulfide contains a copper sulfide as a main component and contains a nickel metal and a cobalt metal.3. The method for separating copper from nickel and cobalt according to claim 1 , wherein when the sulfide is brought into contact with the acid solution claim 1 , addition amounts of the sulfide and the acid solution are adjusted such that an oxidation-reduction potential of the obtained leachate is maintained at 150 mV or less where a silver/silver chloride electrode is a reference electrode.4. The method for separating copper from nickel and cobalt according to claim 1 , wherein the acid ...

LEACHING AIDS AND METHODS OF USING LEACHING AIDS

Leaching aids, for example, when present in a leaching solution, and methods of using the leaching aids. The leaching aids can include one or a combination of compounds. The method of using the leaching aids can include a process of recovering metal from ore, for example, a process involving heap leaching, solvent extraction and electrowinning. 1. A solution comprising:a lixiviant; and {'br': None, 'sub': n', 'm', 'n', 'p, 'R((AO)B)((AO)H)\u2003\u2003(I)'}, 'one or more compound comprising formula (I)wherein each AO group is, independently, an alkyleneoxy group selected from ethyleneoxy (“EO”), 1,2-propyleneoxy (“PO”), 1,2-butyleneoxy, and styryleneoxy;each n is independently an integer from 0 to 40;m is an integer from 1 to the total number of OH hydrogens in the R group prior to alkoxylation;p is an integer such that the sum of m plus p equals the number of OH hydrogens in the R group prior to alkoxylation;B is H; [{'br': None, 'sub': 1', '2', '3', '1, 'RC(CHO)(II) wherein Ris H, methyl, ethyl, or propyl;'}, {'br': None, 'sub': 2', '4, 'C(CHO)\u2003\u2003(III);'}, {'br': None, 'sub': 2', '2, 'OC(CHO)\u2003\u2003(IV);'}, {'br': None, 'sub': 2', '2, 'N(CHCHO) \u2003\u2003(V)'}, {'br': None, 'sub': 2', 'x', '2', '2', '2', '1', '4, '(R)N(CHCHO) (VI) wherein Ris a C-Calkyl, y is 1-3 and x+y=3;'}, {'br': None, 'sub': 2', 'r, 'O(CH)O (VII), wherein r is 2 to 6; and'}, {'br': None, 'sub': 3', '2, 'O(CH(CH)CH)O \u2003\u2003(VIII);'}], 'R is a group selected from formula (II) to (VIII)wherein the one or more compound is at a concentration of about 1 ppm to about 2000 ppm of the solution.2. The solution of claim 1 , wherein each n is independently 2 to 20.3. The solution of claim 2 , wherein each n is independently 2 to 10.5. The solution of claim 1 , wherein the lixiviant comprises sulfuric acid.6. The solution of claim 1 , wherein the lixiviant is at a concentration of 1 g/L to about 50 g/L of the solution.7. The solution of claim 5 , wherein the lixiviant is at a ...

METHOD AND APPARATUS FOR GA-RECOVERY

The present invention encompasses a method of selectively separating Ga from wastewaters with the aid of a dialysis method. This exploits the particular complexation behaviour of Ga, which forms an unstable tetrahalo complex. This forms only in the case of a sufficiently high halide concentration. Since the halide concentration becomes lower across the membrane, the Ga-tetrahalo complex breaks down in the membrane, as a result of which the Ga is retained. Other metals such as In and Fe do not show this behaviour, and therefore the tetrahalo complexes of these metals can pass through the membrane and hence can be selectively separated off. 115-. (canceled)16. A process for separating gallium from impurities in an aqueous solution , the process comprising: the feed solution is acidic and comprises anionic halide ions and cationic gallium ions in respective concentrations suitable for formation of anionic gallium-halide complexes;', 'the impurities comprise one or a combination of two or more of: an arsenic species, an iron species, and an indium species; and', 'wherein the anionic gallium-halide complexes are selectively retained in the feed solution by the membrane and the impurities pass through the membrane into the dialysate., 'performing a dialysis procedure between a feed solution and a dialysate separated by an anion exchange dialysis membrane, wherein17. The process according to claim 16 , further comprising:maintaining a sufficient halide concentration gradient at the membrane between the dialysate and the feed solution so that the anionic gallium-halide complexes formed in the feed solution disintegrate into constituent cationic gallium ions and anionic halide ions when sorbed into the membrane.18. The process according to claim 17 , wherein the impurities comprise the iron species and/or indium species.19. The process according to claim 18 , wherein the iron species and/or indium species comprise anionic halide complexes comprising cationic iron ions and/or ...

Method for producing highly pure platinum powder, as well as platinum powder that can be obtained according to said method, and use thereof

A method for producing highly pure platinum on an industrial scale, as well as the use of said highly pure platinum. According to the method, a hexahalogenoplatinate is reduced to platinum in acidic conditions.

Selective Extraction of Metals From Complex Inorganic Sources

Compositions and methods are provided that permit both recovery of at least two metals from industrial waste materials and control of the degree of relative recovery between the two metals. Industrial waste is initially treated with an acid and mixed for a defined period of time, and the extracted metals recovered from the resulting supernatant in subsequent steps. Surprisingly, the duration of this initial stirring period has been found to impact the relative degree of recovery of the two metals in a non-linear fashion. 112-. (canceled)13. A method of controlling distribution of metal recovery from a complex inorganic source between a first metal and a second metal , comprising:contacting the complex inorganic source comprising the first metal and the second metal with an acid to form a first suspension;mixing the first suspension for a period of time;upon completion of the period of time, separating the first suspension into a first filtrate and a first solid residue, wherein the first filtrate comprises the first metal and the second metal;contacting the first filtrate with a first precipitating agent to form a second suspension;separating the second suspension into a second filtrate and a second solid residue, wherein the second solid residue comprises a portion of the first metal;contacting the second filtrate with a second precipitating agent to form a third suspension; andseparating the third suspension into a third filtrate and a third solid residue comprising a portion of the second metal,wherein the period of time is selected to provide a desired recovery distribution between the first metal and the second metal, andwherein the first precipitating agent is selected from the group consisting of an organic acid, oxalic acid, an organic amine, ethanolamine, an ethanolamine salt, ammonia, and an ammonium salt, and wherein the second solid residue comprises an alumina-containing gel.14. The method of claim 13 , wherein the first metal is aluminum and the second ...

SOLVENT EXTRACTION OF SCANDIUM FROM LEACH SOLUTIONS

A method for isolating scandium values is provided. The method includes extracting scandium values from a leachate with an organic solvent, thereby obtaining a scandium-loaded organic solvent, wherein the leachate contains iron and scandium ions, and wherein the organic solvent contains a primary amine. The scandium values are then stripped from the scandium-loaded solvent with a stripping solution containing an acid and a salt. 1. A method for isolating scandium values , the method comprising:extracting scandium values from a leachate with an organic solvent, thereby obtaining a scandium-loaded organic solvent, wherein the leachate contains iron and scandium ions, and wherein the organic solvent contains a primary amine; andstripping the scandium values from the scandium-loaded solvent with a stripping solution containing an acid and a salt.2. The method of claim 1 , wherein the stripping solution comprises an acid selected from the group consisting of sulfuric acid claim 1 , nitric acid claim 1 , hydrochloric acid and phosphoric acid.3. The method of claim 1 , wherein the salt is selected from the group consisting of alkali chlorides claim 1 , alkali earth chlorides claim 1 , alkali nitrates claim 1 , alkali sulfates claim 1 , alkali phosphates claim 1 , ammonium chlorides claim 1 , ammonium nitrates claim 1 , ammonium sulfates and ammonium phosphates.4. The method of claim 3 , wherein the salt comprises a cation selected from the group consisting of Na claim 3 , K claim 3 , Li claim 3 , NHand Mg.5. The method of claim 1 , wherein the stripping solution contains hydrochloric acid.6. The method of claim 5 , wherein the salt is selected from the group consisting of alkali chlorides claim 5 , alkali earth chlorides and ammonium chlorides.7. The method of claim 5 , wherein the salt is a chloride comprising a cation selected from the group consisting of Na claim 5 , K claim 5 , Li claim 5 , Mg and NH.8. The method of claim 1 , wherein the stripping solution contains ...

Processes for recovering non-ferrous metals from solid matrices

A process for recovering non-ferrous metals from a solid matrix may include: (a) leaching the solid matrix with an aqueous-based solution containing chloride ions, ammonium ions, and Cu 2+ ions, having a pH of 6.5-8.5, in a presence of oxygen, at a temperature of 100° C.-160° C. and a pressure of 150 kPa-800 kPa, so as to obtain an extraction solution comprising leached metals and solid leaching residue; (b) separating the solid leaching residue from the extraction solution; and/or (c) subjecting the extraction solution to at least one cementation so as to recover the leached metals in elemental state. The pH may be greater than or equal to 6.5 and less than or equal to 8.5. Temperature may be greater than or equal to 100° C. and less than or equal to 160° C. Pressure may be greater than or equal to 150 kPa and less than or equal to 800 kPa.

Apparatus and Process for the Improved Economic Extraction of Metal from a Metal-Bearing Material

The present invention relates to an improved apparatus for economically extracting metal from a metal-bearing material. In particular, the present invention relates to an improved apparatus for extracting metal, including inter alia base metal (i.e. copper) and gold, from a metal-bearing ore, concentrate or other metal-bearing material. The present invention further extends to a process for the extraction of such metal which is carried out in accordance with the aforementioned apparatus. According to a first aspect thereof, the present invention provides an apparatus for extracting metal from a metal-bearing material, said apparatus, including a feed receptacle for receiving a metal-bearing feed stream; a reaction vessel; at least one pump means for delivering the metal-bearing feed stream to the reaction vessel; a means for introducing leaching agents, in the form of a leaching agent solution, to the reaction vessel; a means of agitation by circulating the metal-bearing feed stream and leaching agent solution in the reaction vessel so as to allow for a combination of agitation (tank) leaching and vat leaching to take place; a means for achieving liquid/solid separation; and a means for extracting a metal containing product; —wherein said apparatus is re-locatable and transportable in order to allow the apparatus to be assembled easily on site without being geographically bound to one specific site. 1. An apparatus for extracting metal from a metal-bearing material , the apparatus comprising:a feed receptacle for receiving a metal-bearing feed stream; a reaction vessel; at least one pumping means for delivery of the metal bearing feed stream to the reaction vessel; a means for introducing leaching agents, in the form of a leaching agent solution, to the reaction vessel; a means for agitation and/or stirring and/or circulating the metal-bearing feed stream in the reaction vessel; a means for achieving liquid/solid separation; and a means for extracting a metal- ...

HYDROMETALLURGICAL PROCESS FOR NICKEL OXIDE ORE

Provided is a hydrometallurgical process for nickel oxide ore for recovering nickel and cobalt using a high pressure acid leach process, the process achieving simplification and durability improvement of production facilities, achieving cost reduction and suppression of environmental risk by the compression of the capacity of a tailings dam for storing wastes, and being capable of recycling and effectively utilizing the wastes as a resource. The hydrometallurgical process for nickel oxide ore for recovering nickel and cobalt using a high pressure acid leach process includes an ore processing step, a leaching step, a solid-liquid separation step, a neutralization step, a zinc removal step, a sulfurization step, and a final neutralization step, and further includes step (A), or further includes step (A) and, step (B-) and/or step (B-) after step (A). 1. A hydrometallurgical process for nickel oxide ore for recovering nickel and cobalt using a high pressure acid leach process comprising an ore processing step , a leaching step , a solid-liquid separation step , a neutralization step , a zinc removal step , a sulfurization step , and a final neutralization step , the hydrometallurgical process further comprising ,step (A): a step of separating chromite particles from an ore slurry produced in the ore processing step by a recovery process including specific gravity separation, and then classifying the chromite particles to recover a high-concentration chromite concentrate having a grade of chromium(III) oxide of at least more than 50% by weight.2. A hydrometallurgical process for nickel oxide ore for recovering nickel and cobalt using a high pressure acid leach process comprising an ore processing step , a leaching step , a solid-liquid separation step , a neutralization step , a zinc removal step , a sulfurization step , and a final neutralization step , the hydrometallurgical process further comprising:step (A): a step of separating chromite particles from an ore ...

METHODS AND COMPOSITION FOR SEQUENTIAL ISOLATION OF RARE EARTH ELEMENTS

Methods and compositions are described in which amine-based compounds are utilized in the recovery of rare earth elements from solution. The rare earth elements are recovered selectively and sequentially. 1. A method for isolating a rare earth element from a raw material comprising:providing a solid raw material comprising a first rare earth element, a second rare earth element, and a contaminant;solvating the first rare earth element and the second rare earth element to form a first aqueous solution comprising the first rare earth element and the second rare earth element, and an extracted raw material;separating the first aqueous solution from the extracted raw material;contacting the first aqueous solution with a first basic compound, wherein the first rare earth element has sufficient acidity to form a complex with the first basic compound and the second rare earth element has insufficient acidity to form a complex with the first basic compound, thereby forming a first rare earth element complex and a second aqueous solution, wherein the second aqueous solution comprises the second rare earth element;separating the first rare earth element complex from the second aqueous solution;contacting the second aqueous solution with a second basic compound, wherein the second rare earth element has sufficient acidity to form a complex with the second basic compound, thereby forming a second rare earth element complex and a third aqueous solution.2. The method of claim 1 , further comprising the step of recovering the first rare earth element from the first rare earth element complex.3. The method of or claim 1 , further comprising the step of separating the second rare earth element complex from the third aqueous solution.4. The method of to claim 1 , further comprising the step of separating the second rare earth element from the second rare earth element complex.5. The method of to claim 1 , wherein the raw material further comprises a third rare earth element claim 1 , ...

A sensor system

Contemplated is a sensor system for use with a measuring device. The measuring device being of the type adapted to measure the volume of a desired solid component in a sample volume of a solid-liquid slurry obtained from either a carbon-in-pulp or carbon-in-leach process. The solid-liquid slurry comprises granular carbon particles, ore pulp, and water. The carbon-in-pulp or carbon-in-leach process includes at least one retention tank. The measurement device including: a receptacle for receiving the sample volume of the slurry; a screen provided in the receptacle for separating out the desired solid component from a remainder of the slurry. The solid component is retained in the receptacle to form a bed therein and the remainder is exhausted from the receptacle. The sensor system measures in either the retained solid component, or the exhausted remainder, or both one of: pH; dissolved oxygen; pulp density or carbon content.

PROCESS FOR COMPLEX PROCESSING OF BAUXITE

Method for processing bauxite, including grinding the bauxite and extracting iron; separating the resulting pulp into a solid phase and a liquid phase; extracting aluminium from the liquid phase at a pH of about 7 to 8 to form a precipitate of sodium hydrogen carboaluminate; separating the precipitate of sodium hydrogen carboaluminate from the neutralized pulp; extracting iron from the neutralized liquid phase at a pH of at least about 12 using to form a precipitate of iron hydroxide; separating the precipitate of iron hydroxide from the basic pulp to form an iron ore concentrate and a mother liquor chelate; concentrating the mother liquor chelate using evaporation; cooling the concentrated solution; carbonizing the cooled solution with gaseous carbon dioxide under pressure to crystallize sodium hydrogen carbonate; and separating the crystallized sodium hydrogen carbonate from the carbonized solution to form a chelate liquid phase and a sodium hydrogen carbonate solid phase. 1. A method for processing bauxite , comprising:grinding the bauxite using a circulating chelate solution and heating the ground bauxite solution to extract iron and forming a pulp comprising an iron chelate and an aluminium chelate;separating the pulp into a solid phase enriched in bauxite and into a liquid phase comprising the iron chelate;extracting aluminium from the liquid phase at a pH of about 7 to about 8 using circulating sodium hydrogen carbonate to form a precipitate of sodium hydrogen carboaluminate and forming a neutralized pulp,separating the precipitate of sodium hydrogen carboaluminate from the neutralized pulp to form a neutralized liquid phase;extracting iron from the neutralized liquid phase at a pH of at least about 12 using a hydroxide composition to form a precipitate of iron hydroxide, and forming a basic pulp;separating the precipitate of iron hydroxide from the basic pulp to form an iron ore concentrate and a mother liquor chelate;concentrating the mother liquor chelate ...

PROCESS FOR COLD HYDROCHEMICAL DECOMPOSITION OF SODIUM HYDROGEN ALUMINOSILICATE

A process for cold hydrochemical decomposition of sodium hydrogen aluminosilicate. The process includes decomposing sodium hydrogen aluminosilicate at low temperature with a chelate to form a solution of soluble compounds and insoluble contaminants; separating the insoluble contaminants from the solution with a coagulator and heating to coagulate the silicic acid and form a silicic acid gel; separating the silicic acid gel to form a silicic acid-free solution; decomposing the silicic acid-free solution to form a precipitate of sodium hydrogen carboaluminate and a mother liquor; separating the precipitate from the mother liquor; concentrating, cooling and regenerating the mother liquor and forming sodium hydrogen carbonate; separating the sodium hydrogen carbonate from the regenerated solution; and calcining the sodium hydrogen carboaluminate at a temperature of about to about C. and forming sodium aluminate. 1. A process for cold hydrochemical decomposition of sodium hydrogen aluminosilicate , comprising:decomposing the sodium hydrogen aluminosilicate at a low temperature of less than about 100° C. with a circulating solution of chelate in the presence of a weak acid to form a solution comprising soluble compounds comprising an aluminum chelate, a silicic acid and a sodium salt of the weak acid, and insoluble contaminants,separating the insoluble contaminants from the solution by adding a coagulator to the solution and heating the solution to a temperature of about 100 to about 120° C. to coagulate the silicic add and form a silicic acid gel,separating the resulting silicic acid gel from the solution to form a silicic acid-free solution;decomposing the silicic acid-free solution by treating with an excess of sodium hydrogen carbonate to form a precipitate of sodium hydrogen carboaluminate and a mother liquor;separating the precipitate of sodium hydrogen carboaluminate from the mother liquor;concentrating the mother liquor by evaporation;cooling the concentrated ...

METHOD FOR EXTRACTING SALTS AND TEMPERATURE-REGENERATED EXTRACTING COMPOSITION

A temperature-regenerated hydrophobic liquid composition includes an extracting molecule of a non-alkaline cationic species, a solvating molecule of a complimentary anionic species and a fluidizing agent. The extracting molecule of a non-alkaline cationic species is a macrocycle of which the ring is formed from 24-32 carbon atoms and has the following formula (I) or (II): wherein —n is an integer ranging from 5 to 8, —p is 1 or 2, —m is 3 or 4, —q and t, which may be identical or different, are 0, 1 or 2, —R is a tert-butyl, tert-octyl, O-methyl, O-ethyl, O-propyl, O-isopropyl, O-butyl, O-isobutyl, O-pentyl, O-hexyl, O-heptyl, O-octyl, or OCHPhenyl group or a hydrogen atom, and —R′ and R″, which may be identical or different, are chosen from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, heptyl and octyl groups or R′ and R″ together form a pyrrolidine, piperidine or morpholine ring. 110-. (canceled)13. The process according to claim 11 , wherein the non-alkaline cationic species is at least one of the following cations: calcium claim 11 , strontium and barium.14. The process according to claim 11 , wherein the non-alkaline cationic species is selectively extracted with respect to the cationic species of an alkaline metal.15. The process according to claim 11 , wherein the cationic species of an alkaline metal is sodium ion Na.19. The process according to claim 16 , wherein the extracting molecule has a complexing constant Log K claim 16 , in methanol at 25° C. claim 16 , of the alkaline cationic species to be extracted claim 16 , higher than 3 and less than 11.20. The process according to claim 16 , wherein the at least one alkaline cationic species is selected from lithium claim 16 , sodium claim 16 , potassium claim 16 , rubidium and cesium.21. The process according to claim 16 , wherein the process consists in a selective extraction of alkaline salts with hydrophilic anions.22. The process according to claim 11 , wherein the liquid hydrophobic organic phase ...

METHOD FOR LEACHING COPPER FROM COPPER SULFIDE ORE

The present invention provides a method for efficiently leaching copper from copper sulfide ore by separating and recovering iodine, and iron(III) ions to be used are regenerated by a heap of stacked ore in the method for leaching copper from copper sulfide using a sulfuric acid solution containing iodide ions and iron(III) ions as a leaching solution. The present invention relates to a method for leaching copper from copper sulfide, comprising the following steps: a copper leaching step for leaching copper from copper sulfide ore using a sulfuric acid solution containing iodide ions and iron(III) ions as a leaching solution to yield a first solution; an iodine separation treatment step for separating iodine in the first solution to yield a second solution having a lowered concentration of iodine therein; and an iron oxidation step for oxidizing the second solution to yield a third solution, leaching the copper sulfide ore or another copper sulfide using the third solution and an aqueous solution containing iodine, wherein the iron oxidation step comprises irrigating the solution after iodine separation treatment onto stacked ore, thereby oxidizing iron(II) ions existing in the solution after iodine treatment and generated by copper leaching. 1. A method for leaching copper from copper sulfide ore , comprising the following steps:a copper leaching step for leaching copper from a copper sulfide ore using a sulfuric acid solution containing iodide ions and iron(III) ions as a leaching solution to yield a first solution;an iodine separation treating step for separating iodine in the first solution to yield a second solution having a lowered concentration of iodine therein;an iron oxidation step for oxidizing the second solution to yield a third solution; andleaching the copper sulfide ore or another copper sulfide ore using the third solution and an aqueous solution containing iodine,wherein the iron oxidation step comprises irrigating the second solution onto a ...

LITHIUM RECOVERY FROM PHOSPHATE MINERALS

A process for the recovery of lithium from minerals rich in lithium and phosphate, the process comprising passing an ore containing one or more minerals rich in lithium and phosphate to an acid leach step thereby producing a pregnant leach solution, subjecting the pregnant leach solution to a series of process steps by which one or more impurity elements are removed, and recovering lithium as a lithium containing salt product, wherein the series of process steps by which one or more impurity elements are removed includes a low pH impurity removal step conducted at an elevated temperature for the precipitation of one or more impurities. 150-. (canceled)51. A process for the recovery of lithium from minerals rich in lithium and phosphate , the process characterised by comprising passing an ore containing one or more minerals rich in lithium and phosphate to an acid leach step thereby producing a pregnant leach solution , subjecting the pregnant leach solution to a series of process steps by which one or more impurity elements are removed , and recovering lithium as a lithium containing salt product , wherein the series of process steps by which one or more impurity elements are removed includes a low pH impurity removal step conducted at an elevated temperature of greater than 90° C. for the precipitation of one or more impurities , wherein a base is added to the low pH impurity removal step.52. The process of claim 51 , wherein the base added to the low pH impurity removal step is one or more of limestone claim 51 , lime or monovalent carbonate or hydroxide salts.53. The process of claim 51 , wherein the precipitated impurities of the low pH impurity removal step include sulfuric acid claim 51 , sodium claim 51 , aluminium claim 51 , phosphate and/or fluoride claim 51 , optionally being sulfate precipitated as gypsum and phosphate precipitated as calcium phosphate.54. The process of claim 51 , wherein the conditions of the low pH impurity removal step are such that:( ...

METHOD FOR PURIFYING SCANDIUM AND SCANDIUM EXTRACTANT

Provided is a method for efficiently purifying scandium by separating scandium and impurities from an acidic solution which contains scandium and impurities that include iron. A method for purifying scandium according to the present invention subjects an acidic solution, which contains an element component including at least ion, while containing scandium, to solvent extraction by means of a mixed extractant containing a phosphoric acid-based extractant and a neutral extractant, thereby extracting scandium from the acidic solution. It is preferable that the phosphoric acid-based extractant is contained in the mixed extractant at a mixing molar ratio within the range of from 5% to 50% (inclusive). It is also preferable that the pH of the acidic solution is adjusted to a value within the range of from 0.0 to 2.0 (inclusive) before the solvent extraction. 1. A method for purifying scandium , comprising:subjecting an acidic solution containing an element component including at least iron as well as scandium to solvent extraction using a mixed extractant containing 2-ethylhexylphosphonic acid 1-ethylhexyl or di(2,4,4-trimethylpentyl)phosphinic acid of a phosphoric acid-based extractant and tri-n-octylphosphine oxide of a neutral extractant to extract scandium from the acidic solution.23-. (canceled)4. The method for purifying scandium according to claim 1 , wherein the phosphoric acid-based extractant is contained in the mixed extractant at a mixing proportion in a range of between 5% or more and 50% or less in terms of molar ratio.5. The method for purifying scandium according to claim 1 , wherein a pH of the acidic solution is adjusted to a range of between 0.0 or more and 2.0 or less and the acidic solution after pH adjustment is subjected to the solvent extraction.6. The method for purifying scandium according to claim 1 , wherein the acidic solution isa solution obtained by adding an acid to nickel oxide ore and leaching scandium or a solution obtained by dissolving ...

METHOD AND SYSTEM FOR TREATING MOLYBDENUM-CONTAINING SEWAGE IN MOLYBDENUM ORE AREA

The disclosure relates to sewage treatment, and more particularly to a method and a system for treating molybdenum-containing sewage in molybdenum ore area. In the method, the molybdenum-containing sewage is preliminarily treated in the preliminary precipitation tank to allow the impurities to settle, and then the supernatant sequentially flows into the reaction system and the filtration system for filtration. The effluent discharged from the filtration system has a molybdenum content less than 1.5 mg/L. 1. A method for treating molybdenum-containing sewage in a molybdenum ore area , comprising:(1) subjecting the molybdenum-containing sewage into a primary precipitation tank followed by standing for 40-60 min to settle impurities in the molybdenum-containing sewage; allowing the impurities to flow into a pipeline of a sludge drying system, and allowing a supernatant in the primary precipitation tank to overflow into a regulating tank;(2) pumping a liquid in the regulating tank to a reaction precipitation tank of a reaction system through a booster water pump, and adjusting pH of the liquid in the reaction precipitation tank to 4.5-5; adding a composite coagulant into the reaction precipitation tank, wherein the composite coagulant comprises polymeric ferric sulfate and ferrous sulfate; controlling a mass concentration of the composite coagulant in the reaction precipitation tank to be 70-150 mg/L; allowing molybdate ions in the liquid in the reaction precipitation tank to attract the composite coagulant to form a precipitate, and allowing the precipitate to flow into the pipeline of the sludge drying system; allowing a supernatant in the reaction precipitation tank to overflow into a two-box reaction tank; adding caustic soda into the two-box reaction tank to adjust pH of an effluent of the two-box reaction tank to 7.5, and allowing the a supernatant in the two-box reaction tank to enter a filtration system for filtration; and(3) subjecting the liquid entering the ...

METAL LEACH AND RECOVERY PROCESS

The present invention relates to a metal leach and recovery process. The process involves subjecting a metal bearing material to a reactive process by combining said metal bearing material with a leaching agent to liberate at least one metal value and forming a first aqueous leach pulp. This first aqueous leach pulp is subjected to a solid liquid separation step thereby providing a first clarified aqueous leach solution and a second aqueous leach pulp. The first clarified aqueous leach solution is then subjected to solvent extraction thereby obtaining the first aqueous raffmate. The second aqueous leach pulp is subjected to at least two further solid liquid separation steps of which some or all are in a counter current decantation (CCD) arrangement. Each of the solid liquid separation steps of the CCD arrangement results in an aqueous liquor and aqueous suspension of solids wherein each aqueous suspension of solids resulting from each solid liquid separation step of the CCD arrangement is passed to the subsequent solid liquid separation step and the suspension of solids resulting from the final solid liquid separation step is removed from the process. Further, each aqueous liquor resulting from each solid liquid separation step of the CCD arrangement is passed to the previous solid liquid separation step. The further solid liquid separation steps result in at least one further clarified aqueous leach solution. The at least one further clarified aqueous leach solution is/are subjected to solvent extraction thereby obtaining at least one further aqueous raffinate. At least a portion of the one or more of the at least one further aqueous raffmates is fed into the final solid liquid separation is of the CCD arrangement. The process provides a flocculation system comprising either: (i) addition of an organic polymeric flocculant to or prior to at least one solid liquid separation step, which polymeric flocculant is formed from 2-acrylamido-2-methylpropane sulphonic acid ...

BACKFLOW CASCADE NOVEL PROCESS FOR PRODUCING LITHIUM-7 ISOTOPE

Provided is a backflow cascade novel process for producing a lithium-7 isotope. The process comprises an upper backflow section, an extraction section, an enrichment section, a lower backflow section, and a product acquiring section. Upper backflow phase-conversion liquid and lower backflow phase-conversion liquid are respectively added to the upper backflow section and the lower backflow section, and upper backflow phase-conversion liquid and lower backflow phase-conversion liquid of the lithium material are controlled; the product is precisely acquired in the product acquiring section; an organic phase is added to the upper backflow section, and is recycled in the lower backflow section. By means of cascade connection with a high-performance liquid separator, environmental protection, high efficiency, and multi-level enrichment of the lithium-7 isotope are achieved, and a high-abundance lithium-7 isotope product is obtained. 1. A method for producing lithium-7 isotope which comprises the following steps:(1) continuously and countercurrently running an aqueous phase and an organic phase;wherein the organic phase sequentially passes through an upper backflow section, an extraction section, an enrichment section, and a lower backflow section circularly, wherein a part of the organic phase flowed out from the enrichment section flows into a product acquiring section;the aqueous phase sequentially flows through the lower backflow section, the enrichment section, the extraction section and the upper backflow section, and then flows out;(2) adding lower backflow phase-conversion liquid into the lower backflow section;adding upper backflow phase-conversion liquid into the upper backflow section; andadding reverse extraction liquid into the product acquiring section;(3) adding feed liquid comprising lithium-7 into the enrichment section, said feed liquid is extracted by the extraction section and the upper backflow section, and enriched in the enrichment section, then the ...

PROCESS FOR RECOVERING METAL VALUES FROM OXIDES OF MANGANESE-CONTAINING MATERIALS

An improved method for treating manganese-containing materials, such as nodules recovered by undersea mining, including reacting the materials with ammonia, and leaching with a mineral acid, and to methods for recovering valuable constituents from such nodules, especially manganese, cobalt, nickel, iron, copper, titanium, vanadium, cerium, and molybdenum. A method for the production of nitrate products is also disclosed. 1. A method of recovering metal values from manganese-containing materials , comprising the steps of:a. obtaining manganese-containing materials also containing other metals;{'sub': '3', 'b. reacting the manganese-containing materials with NHto form MnO and to release the other metals;'}c. leaching the reacted materials with a mineral acid to form metal salts,d. precipitating and recovering pay metals from the metal salts; ande. precipitating and recovering manganese oxides and hydroxides.2. A method according to wherein the manganese-containing materials are polymetallic nodules obtained from any body of water.3. A method according to wherein the manganese-containing materials are deep-sea manganese nodules.4. A method according to wherein the manganese-containing materials are manganese-containing nodules recovered by undersea mining.5. A method according to wherein the manganese-containing materials are obtained by the chemical or metallurgical treatment of polymetallic nodules obtained from any body of water.6. A method according to claim 5 , further comprising crushing or grinding the nodules.7. A method according to claim 1 , further comprising removing chlorides from the manganese-containing materials by washing the materials.8. A method according to wherein step b is carried out at elevated temperature.9. A method according to wherein said manganese-containing materials also contain at least one of the metals of the group consisting of: nickel claim 1 , cobalt claim 1 , iron claim 1 , copper claim 1 , magnesium claim 1 , aluminum claim 1 , ...

Vanadium Recovery Method, Method for Producing Electrolytic Solution for Redox Flow Batteries, Vanadium Recovery Device, and Device for Producing Electrolytic Solution for Redox Flow Batteries

The present invention is characterized by comprising: an acid leaching step for obtaining a leach liquid by causing leaching of, by means of an acid, a metal mixture at least containing vanadium and at least one type of a divalent or trivalent metal selected from nickel, cobalt, manganese, palladium, platinum, copper, and zinc; a complex generation step for adding an ammoniacal alkaline aqueous solution to the leach liquid for adjusting the pH to 10-12 and generating, in the alkaline aqueous solution, an ammine complex of a divalent or trivalent metal ion and an anion complex of a tetravalent and/or pentavalent vanadium ion; a divalent or trivalent metal recovery step for adding a carrier having a carboxyl group to the alkaline aqueous solution in which the ammine complex and the anion complex are generated, causing the divalent or trivalent metal ion in the ammine complex to be selectively adsorbed onto the carrier, and recovering the divalent or trivalent metal ion; and a vanadium recovery step for recovering vanadium from the anion complex contained in the alkaline aqueous solution after the divalent or trivalent metal ion is recovered. 1. A method for recovering vanadium from a metal mixture at least containing vanadium and at least one kind of a divalent or trivalent metal selected from nickel , cobalt , manganese , palladium , platinum , copper and zinc , which comprises:an acid leaching step for leaching the metal mixture with an acid to obtain a leach liquid;a complex generating step for adding an ammoniacal alkaline aqueous solution to the leach liquid to adjust the pH to 10-12 and generating an ammine complex of a divalent or trivalent metal ion and an anion complex of a tetravalent and/or pentavalent vanadium ion in the alkaline aqueous solution;a divalent or trivalent metal recovery step for adding a carrier having a carboxyl group to the alkaline aqueous solution in which the ammine complex and the anion complex are generated, causing the divalent or ...

IRON RECOVERY METHOD

A method for recovery of iron in the form of an iron oxide as useful product, such as hematite, from a leach solution obtained from leaching of a nickel laterite ore, is proposed which comprises an oxidation and a hydrolysis of a ferric sulphate and urea mix solution stemming from leaching of nickel laterite ores at a temperature of 60-100° C. 1. A method for recovery of iron in the form of an iron oxide as useful product from a leach solution obtained from leaching of a nickel laterite ore , comprising oxidation and hydrolysis of ferric sulphate and an urea mix solution from leaching of nickel laterite ores at a temperature of 60-100° C.2. The method according to the claim 1 , further comprising adjusting a pH of iron bearing solution to 2.5-3.0 with nickel laterite ore before iron recovery.3. The method according to further comprising performing the method at atmospheric pressure.4. The method according to claim 1 , further comprising using at least one of hydrogen peroxide claim 1 , air claim 1 , or oxygen gas as an oxidizer.5. The method according to claim 1 , further comprising using hematite seedings to initiate iron oxide formation.6. The method according to claim 1 , wherein if after conversion of iron to iron oxide the solution pH drops to 1.0-1.5 claim 1 , reusing the solution for leaching of fresh nickel bearing material.7. The method according to claim 1 , further comprising recovering sulphuric acid associated with iron dissolution substantially without loss.8. The method according to claim 1 , further comprising recovering urea virtually without any loss. The present invention relates to a process for the precipitation of iron as hematite from a solution of Fe2(SO4)3/urea mixture containing nickel and cobalt sulphates.Leaching of nickel laterite ores with sulphuric acid is a widely applied process. Some recent researches indicate that when urea is added to the leach solution in sufficient amounts, metal dissolution rates and metal recoveries into the ...

SOLID-STATE CATALYSTS FOR LOW OR MODERATE TEMPERATURE LEACH APPLICATIONS AND METHODS THEREOF

A method for removing sulfate iron-containing compounds from a low- to moderate-temperature metal sulfide leach circuit () is disclosed. A reactor () within a chloride leach circuit () and which is preferably maintained at a temperature between 20 and 150 degrees Celsius may be provided with a catalyst () comprising a material selected from the group consisting of: colloidal hematite, colloidal goethite, particulate containing FeOOH, particulate containing α-FeOOH, particulate containing γ-FeOOH, particulate containing FeO, particulate containing α-FeO, particulate containing γ-FeO, particulate containing FeO, particulate containing Fe(OH)SO, and a combination thereof. The catalyst () may also be used with heap leach and/or dump leach circuits (), without limitation. Methods for using and generating the catalyst () are also disclosed. In some embodiments, the catalyst () may be used as an anti-frothing agent (e.g., for zinc leaching, without limitation). 112.-. (canceled)131. A method for removing a sulfate iron-containing compound from a metal sulfide leaching circuit () comprising:{'b': 6', '5, 'providing a reactor () within a chloride leach circuit ();'}{'b': 12', '6, 'providing a pressure vessel () downstream of the reactor ();'}{'b': 8', '6', '12, 'providing an upstream solid/liquid separation device () between the reactor () and the pressure vessel ();'}{'b': 2', '6, 'providing a solids feed () containing metal sulfide particles to the reactor ();'}{'b': '6', 'leaching the metal sulfide particles in the reactor ();'}{'b': 7', '5', '8, 'dewatering leach residue () leaving the chloride leach circuit () using the upstream solid/liquid separation device ();'}{'b': 14', '12', '13', '12, 'providing a downstream solid/liquid separation device () downstream of the pressure vessel () for receiving product () leaving the pressure vessel ();'}{'b': '12', 'precipitating a sulfate iron-containing compound out of solution in the pressure vessel ();'}{'b': '14', 'removing ...

COMPOSITIONS AND METHODS FOR ENHANCING PRODUCTION OF ALUMINUM HYDROXIDE IN AN ALUMINUM HYDROXIDE PRODUCTION PROCESS

Compositions and methods used in the modification of crystallization of aluminum hydroxide from liquor in an aluminum hydroxide production process, such as the Bayer process. More particularly, crystal growth modifier compositions comprising a component of crude corn oil derived from a bioethanol production process and/or a component of biodiesel and methods of using such compositions to modify particle size and distribution of precipitated alumina trihydrate in a precipitation liquor crystallization process. 1. A composition for enhancing the production of crystal agglomerates from a precipitation liquor crystallization process comprising:1-100 percent by weight of a crude corn oil component, a biodiesel component or a mixture of the crude corn oil component and the biodiesel component, wherein the crude corn oil component comprises crude corn oil extracted as a distinct phase byproduct from an ethanol production process and wherein the biodiesel component comprises a biodiesel or mixture of biodiesels comprising methyl esters of long chain fatty acids; and0-99 percent by weight of a carrier liquid, the carrier liquid comprising a hydrocarbon liquid.2. The composition of claim 1 , wherein the composition comprises the crude corn oil component claim 1 , the crude corn oil component comprising{'sub': 16', '18, '80 percent or more by weight mono alkyl esters, including Cand Cethyl esters, diglycerol esters and triglycerol esters of long chain fatty acids; and'}0-15 percent by weight free fatty acids.3. The composition of claim 2 , the composition comprising 98-100 percent by weight of the crude corn oil component.4. The composition of claim 2 , wherein the composition consists essentially of the crude corn oil component and the carrier liquid claim 2 , wherein the hydrocarbon liquid is a hydrocarbon oil comprising aliphatic or aromatic oil compounds chosen from the group consisting of paraffinic oils claim 2 , naphthenic oils claim 2 , mixed paraffinic and aromatic ...

METHOD FOR NEUTRALIZING SULFURIC ACID ACIDIC SOLUTION AND HYDROMETALLURGICAL METHOD FOR NICKEL OXIDE ORE

Provided is a method for neutralizing a sulfuric acid acidic solution, whereby the pH of a neutralized solution can be stabilized, and also provided is a hydrometallurgical method for nickel oxide ores. 1. A method for neutralizing a sulfuric acid acidic solution by adding a neutralizing agent thereto ,wherein the flow rate of the sulfuric acid acidic solution is measured to determine a neutralization start solution flow rate,the flow rate of the neutralizing agent is measured to determine a neutralizing agent addition flow rate,the sulfuric acid acidic solution is sampled at predetermined time intervals to measure a free sulfuric acid concentration by a titration method, and the free sulfuric acid concentration is used as a free sulfuric acid coefficient,a neutralizing agent addition ratio is determined using the neutralization start solution flow rate, the neutralizing agent addition flow rate, and the free sulfuric acid coefficient, {'br': None, 'i': R=Qc', 'Qs×C, '/()'}, 'wherein the neutralizing agent addition ratio is represented by the following formulawherein R is the neutralizing agent addition ratio, Qc is the neutralizing agent addition flow rate, Qs is the neutralization start solution flow rate, and C is the free sulfuric acid coefficient, andthe amount of the neutralizing agent added is adjusted using, as an index, the neutralizing agent addition ratio to thereby neutralize the sulfuric acid acidic solution to a desired pH without using a pH meter.2. The method for neutralizing a sulfuric acid acidic solution according to claim 1 , wherein the amount of the neutralizing agent added is adjusted so that the neutralizing agent addition ratio is maintained at a predetermined target value.3. The method for neutralizing a sulfuric acid acidic solution according to claim 1 , wherein the amount of the neutralizing agent added is adjusted so that the neutralizing agent addition ratio is within a predetermined range.4. A hydrometallurgical method for nickel ...

PROCESS FOR EXTRACTING COBALT FROM A SOLUTION COMPRISING, IN ADDITION TO COBALT, ONE OR MORE OTHER METAL ELEMENTS

A process for selectively extracting cobalt from a composition comprising cobalt and one or more other metal elements, wherein the process comprises the following steps: a) a step of forming a precipitate consisting of a coordination complex comprising cobalt, by bringing the solution into contact with at least one aromatic compound comprising at least two nitrogen atoms in its ring; b) a step of recovering the precipitate. 118.-. (canceled)19. A process for selective extraction of the cobalt from a solution comprising cobalt and one or more other metal elements , said process comprising the following steps:a) forming a precipitate consisting of a coordination complex comprising cobalt, said precipitate formed by placing said solution in contact with at least one aromatic compound comprising, in its ring, at least two nitrogen atoms;b) recovering the precipitate.20. The process according to claim 19 , wherein the coordination complex is a coordination polymer.21. The process according to claim 19 , wherein the other metal element(s) are transition metal elements.22. The process according to claim 21 , wherein the other metal element(s) are chosen from nickel claim 21 , manganese claim 21 , and the mixtures thereof.23. The process according to claim 19 , wherein the aromatic compound(s) are chosen from the monocyclic aromatic five-membered compounds comprising two carbon atoms claim 19 , the bicyclic aromatic compounds claim 19 , one of the rings of which is a five-membered ring including two nitrogen atoms claim 19 , or the monocyclic aromatic six-membered compounds comprising two nitrogen atoms or three nitrogen atoms.28. The process according to claim 19 , wherein the step of precipitation is carried out with stirring and without applying heat.29. The process according to claim 19 , wherein claim 19 , when the solution claim 19 , in addition to the cobalt claim 19 , comprises claim 19 , as other metal element(s) claim 19 , manganese claim 19 , nickel claim 19 , ...

Method for Producing a High-purity Nanometer Zinc Oxide from Low-grade Zinc Oxide Ore by Ammonia Decarburization

Disclosed is a method for producing a nanometer zinc oxide from low-grade zinc oxide ore by ammonia decarburization. The method comprises: taking ammonia water-ammonium bicarbonate solution as a leaching agent; adding 0.3-0.5 kg sodium fluorosilicate to per cubic meter of the leaching agent; leaching low-grade zinc oxide ore with the leaching agent; and adding 50-60 kg slaked lime to per cubic meter of leached solution to carry out decarburization treatment. The obtained nanometer zinc oxide powder has purity of 99.7% or up, uniform particle size distribution (average particle size of 10-28 nm), specific surface area of 107 m/g or up, good fluidity and good dispersity. The treatment method of the present invention is low in energy consumption and high in efficiency, and the leaching agent can be recycled. The final leached residue subject to the leaching treatment, without destruction of original mineral component phase composition, can still be used for brick making, so as to achieve dual purposes of economy and environment protection, and has a high economic value and social value. 1. A method for producing a nanometer zinc oxide from low-grade zinc oxide ore by ammonia decarburization , comprising:the low-grade zinc oxide ore being processed by leaching, purification for impurity removal, crystallization by ammonia evaporation, drying and calcinations, comprising:{'sub': 3', '3, 'sup': '2−', 'taking ammonia water-ammonium bicarbonate solution as a leaching agent in said leaching step, wherein said ammonia water-ammonium bicarbonate solution includes the molar concentration c(NH)=5.5-7 mol/L, the molar concentration c(CO)=0.95-1.2 mol/L, and 0.3-0.5 kg sodium fluorosilicate is added to per cubic meter of said leaching agent;'}{'sub': 3', '3', '3, 'sup': 2−', '3', '3', '2−', '2−, 'adjusting zinc oxide of said leached solution to 50-60 g/L, and then performing heating to reduce ammonia and decarburize and natural precipitation, including: adding 30-60 kg slaked lime ...

PRODUCTION OF LITHIUM HYDROXIDE

A process () for the production of lithium hydroxide, the process comprising the steps of: 1. A process for the production of lithium hydroxide , the process comprising the steps of:(i) Causticising lithium chloride with sodium hydroxide to produce a lithium hydroxide product;(ii) Collecting the solids resulting from the causticisation of step (i) and filtering same;(iii) The filtered solids from step (ii) are passed to a heating step in which anhydrous lithium hydroxide is produced;(iv) Filtering the anhydrous lithium hydroxide product of step (iii); and(v) Quenching the anhydrous lithium hydroxide of step (iv) with water to produce lithium hydroxide monohydrate crystals.2. The process according to claim 1 , wherein the lithium chloride of step (i) is a purified lithium chloride.3. The process according to claim 1 , wherein the lithium chloride of step (i) is obtained from either a brine or spodumene source.4. The process according to claim 1 , wherein the causticising step (i) employs a stoichiometric ratio of lithium chloride and sodium hydroxide.5. The process according to claim 1 , wherein the causticising step (i) is conducted in a series of three or more reaction vessels.6. The process according to claim 5 , wherein the residence time in each reaction vessel is between about 15 and 60 minutes.7. The process according to claim 5 , wherein the residence time in each reaction vessel is about 30 minutes.8. The process according to claim 1 , wherein after the relevant residence time of step (i) the product is filtered claim 1 , producing a filtrate comprising precipitated lithium hydroxide monohydrate claim 1 , sodium chloride and some un-reacted lithium chloride.9. The process according to claim 8 , wherein the remaining solution from filtration claim 8 , containing both lithium chloride and sodium hydroxide claim 8 , is recycled to the first of the series of reaction vessels.10. The process according to claim 1 , wherein the heating step (iii) is conducted at ...

HYDROMETALLURGICAL PROCESS USING MULTI-STAGE NANOFILTRATION

Nanofiltration can be used to improve a hydrometallurgical process in which valuable metal is extracted from ore or tailings by leaching with a suitable lixiviant. The process requires at least two nanofiltration sub-systems in which raffinate from a solvent extraction process is treated in a nanofiltration subsystem, after which permeate therefrom is combined with a pregnant solution stream and is treated in a second nanofiltration sub-system. This arrangement can lead to advantages in the amount of lixiviant recovered, in the raw materials required, in the effluent produced, in the size of plant, and in overall cost. 2. The hydrometallurgical process of comprising combining the first permeate stream from the first nanofiltration subsystem with the pregnant solution stream before recovering the metal from the pregnant solution stream.3. The hydrometallurgical process of comprising combining the first permeate stream from the first nanofiltration subsystem with the pregnant solution stream after recovering the metal from the pregnant solution stream.4. The hydrometallurgical process of wherein the material comprises ore or tailings.5. The hydrometallurgical process of wherein the lixiviant is an aqueous acid solution6. The hydrometallurgical process of comprising:neutralizing the first retentate stream with lime; anddischarging the neutralized first retentate stream as effluent.7. The hydrometallurgical process of wherein the valuable metal is uranium claim 5 , the acid is sulfuric acid claim 5 , and the hydrometallurgical process comprises:counter current decanting the leach solution and impurity solids with a counter current decanting mixture comprising sulfuric acid and water to remove the solids;combining the first permeate stream from the first nanofiltration subsystem with the pregnant solution stream obtained before recovering the metal therefrom;employing the second permeate stream in the counter current decanting mixture;chemically precipitating the uranium ...

Nickel recovery process

A nickel recovery process capable of decreasing nickel remaining in a byproduct by recovering nickel from the byproduct of electrolytic nickel manufacturing process by chlorine-leaching, and also, capable of simplifying a cementation step simultaneously, is provided. In a nickel recovery step S 60 , a nickel recovery step S 70 and a nickel recovery step S 80 , nickel is recovered in each step from S 0 slurry, residue flaker and chlorine-leached residue, which are byproducts of electrolytic nickel manufacturing process by chlorine-leaching, by using an aqueous solution containing 80 g/L to 390 g/L of chlorine and 30 g/L to 70 g/L of copper.

METHOD FOR SEPARATING COPPER, NICKEL, AND COBALT

Provided is a method for separating copper, nickel, and cobalt, the method being capable of efficiently and selectively separating copper, nickel, and cobalt from alloys containing copper, nickel, and cobalt, such as highly corrosive alloys containing copper, nickel, and cobalt obtained by dry-processing used lithium ion batteries. The alloy containing copper, nickel, and cobalt is brought into contact with nitric acid in the co-presence of a sulfiding agent to obtain a solid containing copper and a leachate containing nickel and cobalt. 1. A method for separating copper from nickel and cobalt ,wherein an alloy containing copper, nickel, and cobalt is brought into contact with a nitric acid in a joint presence of a sulfurizing agent, and a solid containing copper and a leachate containing nickel and cobalt are obtained.2. The method for separating copper from nickel and cobalt according to claim 1 ,wherein the sulfurizing agent is one or more types selected from sulfur, hydrogen sulfide gas, sodium hydrogen sulfide, and sodium sulfide.3. The method for separating copper from nickel and cobalt according to claim 1 ,wherein the nitric acid and the sulfurizing agent are simultaneously brought into contact with the alloy containing copper, nickel, and cobalt, or the sulfurizing agent is brought into contact with the alloy, and then, the nitric acid is brought into contact with the alloy.4. The method for separating copper from nickel and cobalt according to claim 1 ,wherein the alloy containing copper, nickel, and cobalt is an alloy that is obtained by heating and melting, and reducing scrap of a lithium ion cell.5. The method for separating copper from nickel and cobalt according to claim 1 ,wherein the alloy containing copper, nickel, and cobalt is a powder material, and a particle diameter of the alloy containing copper, nickel, and cobalt is less than or equal to 300 μm.6. The method for separating copper from nickel and cobalt according to claim 1 ,wherein the ...

METHOD OF RECOVERING RARE-EARTH ELEMENTS

Provided is a method of recovering rare-earth elements by performing slight pH adjustment of a leachate, which does not require such significant pH adjustment as in conventional methods, reduces cost and effort, and can efficiently recover rare-earth elements in a bauxite residue in a good yield. The method of recovering rare-earth elements is a method of recovering rare-earth elements, the method including: a leaching step of bringing a raw material bauxite residue, which is produced as a by-product in a Bayer process, into contact with a liquid leaching agent to recover a leachate containing rare-earth elements; an extraction step of bringing the leachate into contact with an extraction treatment liquid containing a phosphoric acid ester-based extractant to recover an extract liquid containing the rare-earth elements; and a back extraction step of bringing the extract liquid into contact with a back extraction treatment liquid to recover the rare-earth elements, the leaching step including recovering a leachate having a pH of 0.5 or more and 1.2 or less by using an acidic liquid leaching agent, the extraction step including adjusting the pH of the leachate to 1.0 or more and 1.7 or less and then bringing the leachate into contact with the extraction treatment liquid. 1. A method of recovering rare-earth elements from a bauxite residue , which is produced as a by-product in a Bayer process and is used as a raw material ,the method comprising:a leaching step of bringing the bauxite residue into contact with a liquid leaching agent to recover a leachate containing rare-earth elements;an extraction step of bringing the leachate into contact with an extraction treatment liquid containing a phosphoric acid ester-based extractant to recover an extract liquid containing the rare-earth elements; anda back extraction step of bringing the extract liquid into contact with a back extraction treatment liquid to recover the rare-earth elements,the leaching step comprising ...

CLOSED LOOP METHOD FOR GOLD AND SILVER EXTRACTION BY HALOGENS

A method for extracting precious metals from a polymetallic ore, comprising a) generating hypochlorites from a salt brine; b) chlorination of the ore using hypochlorites under acidic conditions; c) filtering to collect a pregnant solution and treating the pregnant solution for collection of precious metals; d) filtering to separate the precious metals and a barren brine; e) purifying the barren brine; and f) recycling halogens from the purified brine in the form of hypohalites formed by electrolysis of the purified brine, and comprising hypochlorite and hypobromite; step b) further comprising scrubbing excess halogens using calcium hydroxide; treatng the pregnant solution in step c) comprises reducing an oxydo reduction potential of the pregnant solution and using calcium hydroxide for neutralization; and step e) comprising increasing the pH of the barren brine by addition of calcium hydroxide. 1. A method for extracting precious metals from a polymetallic ore , comprising:a) generating hypochlorites from a salt brine;b) chlorination of the ore using hypochlorites under acidic conditions;c) filtering to collect a pregnant solution and treating the pregnant solution for collection of precious metals;d) filtering to separate the precious metals and a barren brine;e) purifying the barren brine; andf) recycling halogens from the purified brine in the form of hypohalites formed by electrolysis of the purified brine, and comprising hypochlorite and hypobromite;wherein:said step b) further comprises scrubbing excess halogens using calcium hydroxide;said treating the pregnant solution in step c) comprises reducing an oxydo reduction potential of the pregnant solution and using calcium hydroxide for neutralization; andsaid step e) comprises increasing the pH of the barren brine by addition of calcium hydroxide.2. The method of claim 1 , wherein said scrubbing excess halogens in step b) uses a calcium hydroxide slurry with a calcium hydroxide content in a range between about ...

Method for extraction of lithium from lithium bearing solution

A method of extracting lithium from a lithium bearing solution and specifically, economically extracting lithium from a lithium bearing solution comprising the steps of: adding a nucleus particle to a lithium bearing solution; and precipitating the dissolved lithium in the lithium bearing solution as lithium phosphate by adding a phosphorous supplying material to the lithium bearing solution including the nucleus particle is provided.

METHOD FOR REMOVING COBALT DEPOSITS IN A HIGH-PRESSURE OLEFIN HYDROFORMYLATION REACTOR

Method of removing cobalt deposits in a reactor for the cobalt-catalyzed high-pressure hydroformylation of olefins by treatment with aqueous nitric acid, wherein the reactor is at least partly filled with aqueous nitric acid and the temperature of the aqueous nitric acid is increased during the treatment. 113.-. (canceled)14. A method of removing cobalt deposits from a reactor , the method comprising;at least partly filling the reactor with aqueous nitric acid, the nitric acid reacting with cobalt present in the reactor to form a nitrogen oxide offgas, andmeasuring the nitric acid concentration and/or the cobalt ion concentration of the aqueous nitric acid in the reactor over time, and if a change in the acid concentration, and/or the cobalt ion concentration in the nitric acid, falls below a determined set limit value, the temperature of the aqueous nitric acid in the reactor is increased, wherein the reactor is a high-pressure, olefin hydroformylation reactor15. The method according to claim 14 , further comprising combining the nitrogen oxide offgas with a gas that includes molecular oxygen claim 14 , wherein at least part of the combined offgas is absorbed into an aqueous liquid.16. The method according to claim 14 , wherein the aqueous liquid is conveyed in countercurrent to the nitrogen oxide offgas in a scrubbing column claim 14 , and a gas that includes molecular oxygen is combined with the offgas and/or introduced into the scrubbing column.17. The method according to claim 14 , wherein the partly filling of the reactor includes circulating the aqueous nitric acid in the reactor.18. The method according to claim 14 , further comprising removing an exhausted aqueous nitric acid from the reactor if the acid concentration drops below a set acid limit value claim 14 , or the cobalt ion concentration rises above a set cobalt ion limit value.19. The method according to claim 18 , wherein the set acid limit value is about 25 g HNOper liter.20. The method according ...

PROCESSES AND SYSTEMS FOR PREPARING LITHIUM CARBONATE

There are provided processes comprising submitting an aqueous composition comprising lithium sulphate and/or bisulfate to an electrolysis or an electrodialysis for converting at least a portion of said sulphate into lithium hydroxide. During electrolysis or electrodialysis, the aqueous composition is at least substantially maintained at a pH having a value of about 1 to about 4; and converting said lithium hydroxide into lithium carbonate. Alternatively, lithium sulfate and/or lithium bisulfate can be submitted to a first electromembrane process that comprises a two-compartment membrane process for conversion of lithium sulfate and/or lithium bisulfate to lithium hydroxide, and obtaining a first lithium-reduced aqueous stream and a first lithium hydroxide-enriched aqueous stream; and submitting said first lithium-reduced aqueous stream to a second electromembrane process comprising a three-compartment membrane process to prepare at least a further portion of lithium hydroxide and obtaining a second lithium-reduced aqueous stream and a second lithium-hydroxide enriched aqueous stream. 1. A process for preparing lithium carbonate , said process comprising:submitting an aqueous composition comprising lithium sulphate to an electrolysis or an electrodialysis under conditions suitable for converting at least a portion of said lithium sulphate into lithium hydroxide, wherein during said electrolysis or said electrodialysis, said aqueous composition comprising lithium sulphate is at least substantially maintained at a pH having a value of about 1 to about 4; andconverting said lithium hydroxide into lithium carbonate.2. The process of claim 1 , wherein said aqueous composition comprising lithium sulphate is submitted to an electrolysis.3. The process of claim 1 , wherein said aqueous composition comprising lithium sulphate is submitted to a bipolar membrane electrodialysis process.4. The process of claim 1 , wherein said aqueous composition comprising lithium sulphate is ...

Method for separating rhenium and arsenic, and method for purification of rhenium

The present invention aims at separating and removing arsenic in a stable form from raw material containing rhenium and arsenic, and reducing a circulation amount of arsenic in a rhenium purification process to obtain rhenium with low-content arsenic. A method for separating rhenium from arsenic in a rhenium purification process, wherein the raw material containing rhenium and arsenic is oxidized and leached, and separated into a leachate containing perrhenic, arsenic, and arsenous acids and a leaching residue containing arsenate, followed by purification of rhenium from the leachate, wherein an alkali is added to the leachate to obtain an arsenic-containing precipitate and a rhenium-containing solution, rhenium is separated from the obtained rhenium-containing solution, an alkali is added to either or both obtained arsenic-containing precipitate and the leaching residue containing arsenate to obtain an arsenic-containing solution and a hydroxide precipitate, and arsenic in the obtained arsenic-containing solution is fixed as a precipitate.

HYDROMETALLURGICAL PROCESS FOR NICKEL OXIDE ORE

Provided is a hydrometallurgical process of recovering Ni from nickel oxide ore using a high pressure acid leaching, in which abrasion of the facilities caused by an ore slurry is suppressed, the amount of a final neutralized residue is reduced, and impurity components are separated and recovered for recycling. The hydrometallurgical process includes, as steps of the high pressure acid leaching, at least one step selected from step (A): separating and recovering chromite particles in the ore slurry; step (B-1): through leaching step and a solid-liquid separation step, performing neutralization of a leachate obtained after the solid-liquid separation step using a Mg-based alkali such as Mg(OH); and step (B-2): through leaching step and a solid-liquid separation step, performing neutralization of a leachate obtained after the solid-liquid separation step using a Mg-based alkali such as Mg(OH), and then recovering hematite particles. 1. A hydrometallurgical process for nickel oxide ore of recovering nickel and cobalt from nickel oxide ore using a high pressure acid leaching that includes an ore processing step , a leaching step , a solid-liquid separation step , a neutralization step , a zinc removal step , a sulfurization step , and a final neutralization step , the method comprising at least one step selected from the following step (A) , step (B-1) , and step (B-2):Step (A): separating and recovering chromite particles in an ore slurry produced from the ore processing step, by a recovery process including a specific gravity separation;Step (B-1): neutralizing a leachate produced by subjecting the ore slurry that has the chromium-level lowered through the step (A), to the leaching step and the solid-liquid separation step, while the neutralization is carried out using a magnesium-based neutralizing agent; andStep (B-2): neutralizing a leach residue slurry produced by subjecting the ore slurry that has the chromium-level lowered through the step (A), to the leaching ...

Chromium-containing water treatment method

The present invention provides a chromium-containing water treatment method that allows treatment of water that contains chromium (chromium-containing water) at low cost. A chromium-containing water treatment method according to the present invention comprises: a reduction step in which chromium-containing water 11 and a liquid 12 containing 5-50 ppm of hydrogen sulfide are mixed, and the mixture is adjusted to pH 3.5 or lower and ORP 200-400 mV by adding an acid 13 thereto, so as to reduce chromium contained in the water; and a precipitation separation step in which a neutralizing agent is added to a solution 11′ obtained via the reduction step so as to adjust the solution 11′ to pH 8-9, thereby precipitating and separating, as a hydroxide, the reduced chromium contained in the solution.

Method and device for removing iron in iron-containing solution in hydrometallurgy

The present disclosure discloses a method and device for removing iron in an iron-containing solution in hydrometallurgy. This method comprises the steps of: adding an iron-containing solution in hydrometallurgy into a reactor through a first homogenizing distributor, controlling concentration of the ferric iron in the reactor below 1 g/L, controlling pH of the solution in the reactor to be 2.5˜4, the temperature to be 65˜100° C., and the reaction duration to be 1˜3 hours, performing solid-liquid separation for the solution after reaction, and removing the iron in the iron-containing solution in hydrometallurgy in the form of goethite. 1. A method for removing iron in an iron-containing solution in hydrometallurgy , comprising steps of: adding the iron-containing solution in hydrometallurgy into a reactor through a first homogenizing distributor , controlling concentration of ferric iron in the reactor below 1 g/L , controlling pH of the solution in the reactor to be 2.5˜4 , temperature to be 65˜100° C. , and reaction duration to be 1˜3 hours , performing solid-liquid separation for the solution after reaction , and removing iron in the iron-containing solution in hydrometallurgy in a form of goethite.2. The method according to claim 1 , wherein controlling pH of the solution in the reactor to be 2.5˜4 is achieved by adding neutralizer to the reactor through a second homogenizing distributor.3. The method according to claim 2 , wherein the neutralizer is one or more selected from a group consisting of limestone claim 2 , lime claim 2 , magnesium oxide claim 2 , zinc oxide and sodium hydroxide.4. The method according to claim 1 , wherein the first homogenizing distributor is a uniform dispersing device.5. The method according to claim 1 , wherein the reactor is a reactor with stirring function.6. The method according to claim 1 , wherein when the iron-containing solution in hydrometallurgy contains ferrous iron claim 1 , oxidant is added to the reactor to oxidize ...

N-SUBSTITUTED GLYCINIUM BIS(FLUOROSULFONYL)IMIDE IONIC LIQUID

The present invention provides N-substituted glycinium bis(fluorosulfonyl)imide compounds and methods for producing and using the same. In particular, the N-substituted glycinium bis(fluorosulfonyl)imide compound is of the formula: 2. The ionic liquid compound according to claim 1 , wherein each of R claim 1 , Rand Ris independently alkyl.3. The ionic liquid compound according to claim 1 , wherein Rand Rtogether with the nitrogen atom to which they are attached to form a nitrogen-heterocyclyl or a nitrogen-heteroaryl.4. The ionic liquid compound according to claim 3 , wherein Rand Rtogether with the nitrogen atom to which they are attached to form a nitrogen-heterocyclyl or a nitrogen-heteroaryl selected from the group consisting of 3 claim 3 ,4-dihydro-2H-pyrrolidinium claim 3 , 2 claim 3 ,3 claim 3 ,4 claim 3 ,5-tetrahydropyridinium claim 3 , imidazolium claim 3 , pyridinium claim 3 , pyrrolidinium claim 3 , piperidinium claim 3 , and morpholinium.6. The method of claim 5 , wherein said method comprises anhydrous conditions.7. The method of claim 5 , wherein each of R claim 5 , Rand Ris independently C-Calkyl.8. The method of claim 7 , wherein R claim 7 , Rand Rare methyl.9. The method of claim 5 , wherein said method comprises adding bis(fluorosulfonyl)imide to said zwitter-ion of Formula II while maintaining the reaction temperature below 65° C.10. The method of claim 9 , wherein bis(fluorosulfonyl)imide is added to said zwitter-ion of Formula II at a temperature of at least 50° C.11. The method of further comprising the step of increasing the reaction temperature to above 65° C. after complete addition of bis(fluorosulfonyl)imide.12. The method of claim 9 , wherein said method is conducted in the absence of any solvent.13. The method of claim 9 , wherein said zwitter-ion of Formula II is in an aqueous solution.14. The method of claim 13 , wherein bis(fluorosulfonyl)imide is added to said aqueous solution of zwitter-ion of Formula II at a temperature of 40° C. ...

LITHIUM RECOVERY METHOD

To provide a lithium recovery method which is capable of efficiently recovering lithium without containing impurities, such as phosphorus and fluorine. In the present invention, an alkali is added to a discharge liquid and/or a cleaning liquid containing lithium discharged in a process of recovering valuable metals from a lithium ion battery, an acidic solvent extractant is caused to be in contact with the discharge liquid and/or the cleaning liquid under a condition of pH 9 or less and a temperature of 0 to 25° C. and lithium ions are extracted, and the acidic solvent extractant having extracted the lithium ions is caused to be in contact with an acid solution of pH 3 or less and the lithium ions are stripped. 1. A lithium recovery method comprising:an extraction process of cleaning, with water, a discharge liquid and/or a cleaning liquid containing lithium discharged in a process of recovering valuable metals from a lithium ion battery, adding an alkali to the cleaned discharge liquid and/or the cleaned cleaning liquid, and allowing an acidic solvent extractant to be in contact with the discharge liquid and/or the cleaning liquid under a condition of pH exceeding 7, and 9 or less, and a temperature of 0 to 25° C. to extract lithium ions; anda stripping process of allowing the acidic solvent extractant having extracted the lithium ions in the extraction process to be in contact with an acid solution of pH 3 or less to strip the lithium ions.2. (canceled)3. The lithium recovery method according to claim 1 , wherein a temperature condition of the stripping process is 0 to 25° C.4. The lithium recovery method according to claim 1 , wherein the acidic solvent extractant is di(2-ethylhexyl) phosphonic acid.5. The lithium recovery method according to claim 1 , further comprising a lithium carbonate deposition process of adding a carbon dioxide gas or a water-soluble carbonate to a stripping liquid containing the lithium ions obtained in the stripping process claim 1 , ...

NEUTRALIZATION TREATMENT METHOD AND NEUTRALIZING AGENT

Provided is a neutralization treatment method capable of performing an efficient neutralization treatment with the reduction of the amount of a neutralizing agent to be used such as slaked lime in a neutralization treatment that is performed in order to discharge a process liquid generated in a metal smelting or hydrometallurgy process to the outside of the system. The neutralization treatment is performed for a liquid discharged in a metal smelting or hydrometallurgy process by using as a neutralizing agent boiler ash that is obtained after combustion of a fluidized-bed boiler and is obtained by burning of a sulfur content derived from coal being a fuel while adding lime stone to the sulfur content and desulfurizing the sulfur content. 1. A neutralization treatment method for a barren solution in a neutralization step in a hydrometallurgy process comprising:a leaching step in which nickel and cobalt are leached from a nickel oxide ore;a solid-liquid separation step in which the resultant leached slurry is solid-liquid separated into a leachate and leached residues;the neutralization step in which the leachate is neutralized, and separated into a mother liquid for the recovery of nickel and cobalt and a neutralized precipitate slurry; anda sulfurization step in which a sulfurization treatment is performed by the blowing of hydrogen sulfide gas into a sulfuric acid solution that is a mother liquid, and a mixed sulfide containing nickel and cobalt and a barren solution are obtained, wherein a neutralization treatment is performed using as part of a neutralizing agent together with the slaked lime or lime stone boiler ash being obtained after combustion of a fluidized-bed boiler and being obtained by burning of a sulfur content derived from coal being a fuel while adding lime stone to the sulfur content and desulfurizing the sulfur content.2. The neutralization treatment method according to claim 1 , whereina boiler ash slurry being a slurry of the boiler ash is used ...

PRODUCTION OF HIGH STRENGTH HYDROCHLORIC ACID FROM CALCIUM CHLORIDE FEED STREAMS BY CRYSTALLIZATION

The present relates to a method for producing calcium sulfate solid crystals and hydrochloric acid (HCl) from a calcium chloride solution comprising the steps of feeding a continuous stirred-tank reactor with a calcium chloride solution, sulfuric acid and water; mixing the calcium chloride solution, sulfuric acid and water in the reactor; and maintaining the reactor a temperature of less than about 70° C., converting the calcium chloride solution, sulfuric acid and water into HCl and calcium sulfate solid crystals. The method described herein can be incorporated as a means for regenerating HCl from CaClsolutions which are generated in the metallurgical industry when processing calcium-bearing ores for recovering metals like rare earth elements. 1. A method for producing calcium sulfate solid crystals and azeotropic hydrochloric acid (HCl) from a calcium chloride solution comprising the steps of:feeding a continuous-stirred tank reactor with a calcium chloride solution, sulfuric acid and water;mixing the calcium chloride solution, sulfuric acid and water in the reactor; andmaintaining the reactor at a temperature of less than about 70° C.,converting the calcium chloride solution, sulfuric acid and water into azeotropic HCl and calcium sulfate solid crystals.2. The method of claim 1 , wherein the calcium sulfate solid crystals are crystals of at least one of calcium sulfate dihydrate claim 1 , calcium sulfate α-hemihydrate and mixture thereof.3. (canceled)4. The method of claim 1 , wherein up to 30 wt % (9.5 mol/L) of super-azeotropic HCl is obtained.5. The method of claim 1 , wherein the ratio of sulfate to calcium in the reactor is 0.90 to 0.98.6. The method of claim 1 , wherein the temperature of the reactor is about less than 60° C.7. The method of claim 1 , wherein the temperature of the reactor is about 40° C.-70° C.8. The method of claim 1 , wherein the temperature of the reactor is about 40° C. or less.9. The method of claim 1 , wherein the reactor is ...

SYSTEMS AND METHODS FOR IMPROVED METAL RECOVERY USING AMMONIA LEACHING

Systems and methods for basic leaching are provided. In various embodiments, a method is provided comprising leaching a slurry comprising a copper bearing material and an ammonia leach medium, adding copper powder to the slurry, separating the slurry into a pregnant leach solution and solids, and performing a solvent extraction on the pregnant leach solution to produce an loaded aqueous stream. 1. (canceled)2. A method comprising:leaching a slurry comprising a metal bearing material and an ammonia leach medium, wherein the metal bearing material comprises copper and cobalt;adding a reducing agent to the slurry, wherein the reducing agent comprises a copper powder, and wherein the reducing agent is added to the slurry such that a stoichiometric ratio of copper to cobalt is greater than 0.5; andseparating the slurry into a pregnant leach solution and solids; and performing a solvent extraction on the pregnant leach solution to produce a loaded aqueous stream.3. The method of claim 2 , wherein the stoichiometric ratio of copper to cobalt is between about 4 and about 12.4. The method of claim 3 , wherein the stoichiometric ratio of copper to cobalt is about 8.5. The method of claim 2 , further comprising: producing a cobalt precipitate from a raffinate produced by the solvent extraction; and subjecting the cobalt precipitate to a metal recovery process.6. The method of claim 5 , further comprising adding ammonium hydrosulfide to the raffinate produced by the solvent extraction.7. The method of claim 2 , subjecting the loaded aqueous stream to electrowinning.8. The method of claim 2 , further comprising wet grinding the metal bearing material prior to the leaching.9. The method of claim 2 , further comprising adding sulfur dioxide gas to the slurry.10. The method of claim 9 , further comprising adding air to the slurry.11. The method of claim 2 , wherein the solvent extraction comprises subjecting the pregnant leach solution to a copper specific extracting reagent.12. ...

NICKEL EXTRACTION METHOD

In the present invention, nickel is selectively extracted from an acidic solution that contains a high concentration of manganese. This valuable metal extraction agent is represented by the general formula. In the formula, Rand Rare alkyl groups that may be the same or different, Ris a hydrogen atom or an alkyl group, and Ris a hydrogen atom or any group, other than an amino group, bonded to an a carbon atom of an amino acid. The general formula preferably has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit or a n-methylglycine unit. When extracting nickel by using this extraction agent, it is preferable to adjust the pH of the acidic solution to 2.3 to 5.5 inclusive. 2. The nickel extraction method according to claim 1 , wherein the amide derivative is any one or more of glycinamide derivatives claim 1 , histidinamide derivatives claim 1 , lysinamide derivatives claim 1 , aspartic acid amide derivatives and N-methylglycine derivatives.3. The nickel extraction method according to claim 1 , wherein the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.3 or more to 5.5 or less.4. The nickel extraction method according to claim 1 , wherein the acid solution further contains cobalt and the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of from 2.6 or more to 3.5 or less.5. The nickel extraction method according to claim 1 , wherein the acid solution further contains cobalt and the method comprises:the first separation step in which solvent extraction is carried out with the pH of the acid solution adjusted to 3.5 or more and 5.0 or less to separate an organic phase containing nickel and cobalt and an aqueous phase containing manganese, andthe second separation step in which the organic phase after the first separation step is mixed with a starting solution for back extraction adjusted to a pH of 2.6 or more and 3.5 or less to ...

Process for the separation of iron in extraction of titanium in mixed chloride media

A process for leaching a value metal from a titaniferous ore material comprising the step of leaching the ore material at atmospheric pressure with a lixiviant comprising magnesium chloride and hydrochloric acid is disclosed. Iron and titanium are leached into solution. Iron in the ferric state may be separated from titanium in solution using extraction with alkyl ketone. More effective separation of titanium with lower contamination with iron is obtained. 1. A process for leaching of titanium from a titaniferous ore material selected from the group consisting of a titanium-bearing ore , concentrate thereof , modified ore thereof and tailings thereof , and mixtures thereof , said process comprising the steps of:(a) leaching the titanium-bearing ore material at atmospheric pressure with a lixiviant comprising hydrochloric acid and magnesium chloride, said leach being carried out under conditions such that titanium and iron values leached from the titaniferous ore material remain in solution and iron values are converted to ferric iron;(b) subjecting the leach solution so obtained to liquid/solids separation to obtain a leachate and solids; and(c) subjecting the leachate to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate, said raffinate containing titanium values.2. The process of in which the temperature is less than 85° C.3. The process of in which the temperature is less than 80° C.4. The process of in which the temperature is in the range of 65-80° C.5. The process of in which the hydrochloric acid is at a concentration of less than 20% (mass ratio).6. The process of in which the titanium-bearing ore material is ilmenite.7. The process of in which the redox potential (Eh) of the leach solution is at least 350 mV.8. The process of in which the concentration of magnesium chloride is at least 100 g/L.9. The process of in which the total concentration of chloride ions is in the range of 100-400 g/L claim 8 , said total ...

Novel Method for Extracting Ultra High Purity Alumina from Wastewater

An object of the present invention is to provide a novel method for extracting ultra high purity alumina from wastewater. Wastewater is recycled, filtered, concentrated and pretreated in order to mix with alkali solution and extraction agent PX-17, undergoing 2 times of purification, adding control agent SX-1 and high temperature heat treatment to finally obtain ultra high purity nano-alumina particles which purity reaches as 99.999% and particle size reaches as 20-200 nm. 1. A novel method for extracting ultra high purity nano-alumina from wastewater , characterized in that it comprises the following steps:{'sup': 3+', '3+, '(1) filter the raw material waste containing aluminum (Al) by Teflon mesh, and concentrate it to maintain aluminum ions (Al) mass fraction of 3%˜18%; Then, the concentrated solution is dropped into the alkaline solution while the alkali mass fraction reaches 10%˜60%.'}(2) add extraction agent PX-17 into mixed solution and stir, during extraction process, keep the pH value always at 1-9, maintain the temperature at 10° C.˜90° C.; add extraction agent PX-17 in the preliminary extraction for a secondary extraction, the initial dosage is 1˜5 g/L, and stirring time is 30 min˜5 h in the preliminary extraction; the second dosage is 0.1˜3 g/L, and stirring time is 0.5 h˜5 h in the secondary extraction.(3) add the control agent SX-1 into above extract solution and stir, dosage is 0.1˜5 g/L, stir for 1 h˜24 h at 20° C.˜280° C.; and add the alkali solution under the pH value as 1 to 10 to precipitate the aluminum hydroxide; then cooling, filtering and washing with ultra-pure water for 3˜5 times, drying under 80° C.˜120° C. to obtain pure aluminum hydroxide precursor.(4) heat the pure aluminum hydroxide precursor under 600° C.˜1200° C. for 0.5˜4 hours; then obtain the ultra high purity nano alumina by cooling down under a certain temperature.Wherein the waste water in step (1) contains the surface treatment waste liquid of various aluminum, aluminum plate, ...

SYSTEM AND METHOD INCLUDING MULTI-CIRCUIT SOLUTION EXTRACTION FOR RECOVERY OF METAL VALUES FROM METAL-BEARING MATERIALS

The present disclosure relates to a metal recovery process comprising a solvent extraction process. In an exemplary embodiment, the solution extraction system comprises a plant with a first and second circuit. A high-grade pregnant leach solution (“HGPLS”) is provided to the first and second circuit, and a low-grade pregnant leach solution (“LGPLS”) is provided to the second circuit. The first circuit produces a rich electrolyte, which can be forwarded to a primary metal recovery, and a low-grade raffinate, which can be forwarded to a secondary metal recovery process. The second circuit produces a rich electrolyte, which can also be forwarded to the primary metal recovery process. The first and second circuits are in fluid communication with each other. 1. (canceled)2. A system for extracting metal value comprising: wherein the first circuit comprises a first first circuit extractor, a second first circuit extractor, a third first circuit extractor, a fourth first circuit extractor, and at least two first circuit stripping units, and', 'wherein the second circuit comprises a first second circuit extractor, a second second circuit extractor and at least one second circuit stripping unit;, 'a solution extraction plant comprising a first circuit and a second circuit,'}a first electrolyte forwarded to a primary electrowinning circuit; and wherein the third first circuit extractor is in fluid communication with the first second circuit extractor, and', 'wherein the fourth first circuit extractor is in fluid communication with the second second circuit extractor., 'a second electrolyte forwarded to a second electrowinning circuit,'}3. The system of claim 2 , wherein a first portion of a first metal-bearing solution is provided to the first circuit claim 2 , a second portion of the first metal-bearing solution is provided to the second circuit claim 2 , and a second metal-bearing solution is provided to the second circuit.4. The system of claim 3 , wherein the first metal- ...

BRINE LEACHING PROCESS FOR RECOVERING VALUABLE METALS FROM OXIDE MATERIALS

A process is provided in which a silver- and base metal-containing material is contacted with an aqueous solution comprising an alkali and/or alkaline earth metal halide and an oxidant at a solution pH of at least about pH 6 to dissolve the silver into a pregnant leach solution while maintaining at least most of the base metal in the silver- and base metal-containing material. 1. A process , comprising:contacting a metal-containing material comprising silver and a base metal with an aqueous solution comprising an alkali and/or alkaline earth metal halide and an oxidant, wherein the aqueous solution has a solution pH of at least about pH 6 during the contacting of the metal-containing material and wherein the contacting of the aqueous solution with the metal-containing material dissolves the silver into a pregnant leach solution while maintaining 50 wt. % or more the base metal in the metal-containing material; andrecovering the dissolved silver from the pregnant leach solution.2. The process of claim 1 , wherein the halide is chloride and wherein the aqueous solution has a solution pH from about pH 6.0 to about pH 10.5 during the contacting of the metal-containing material.3. The process of claim 1 , wherein the aqueous solution has a solution pH from about pH 7 to about pH 9 during the contacting of the metal-containing material.4. The process of claim 1 , wherein during the contacting of the metal-containing material and aqueous solution claim 1 , the metal-containing material and aqueous solution are at ambient temperature.5. The process of claim 1 , wherein during the contacting of the metal-containing material and aqueous solution claim 1 , the metal-containing material and aqueous solution have a temperature of one or more of:i) from about 30 to about 110 degrees Fahrenheit; andii) from about 40 to about 100 degrees Fahrenheit.6. The process of claim 1 , wherein an oxidation/reduction potential of the aqueous solution during the contacting step is from about ...

Methods for Controlling Iron via Magnetite Formation in Hydrometallurgical Processes

A method of controlling iron in a hydrometallurgical process is disclosed. The method may comprise the steps of: leaching () a feed slurry (); forming a pregnant leach solution (); removing a first leach residue () from the pregnant leach solution (); and sending a portion () of the pregnant leach solution () and/or raffinate () produced therefrom, to an iron removal process (). According to some preferred embodiments, the iron removal process () may comprise the steps of: sequentially processing the pregnant leach solution () and/or raffinate () produced therefrom in a first reactor (R) a second reactor (R), and a third reactor (R); maintaining a pH level of the first reactor (R) above 4, by virtue of the addition of a first base; maintaining a pH level of the second (R) and/or third (R) reactors above 8.5, by virtue of a second base; and forming solids () comprising magnetite (). The method may further comprise the steps of performing a solid liquid separation step () after the iron removal process (); and performing a magnetic separation step () to remove magnetite () from said solids comprising magnetite (), without limitation. A system for performing the method is also disclosed. 1. (canceled)2. (canceled)31. A method of controlling iron in a hydrometallurgical leach process () comprising the steps of:{'b': 14', '114', '2', '102, 'leaching (, ) a feed slurry (, );'}{'b': 12', '12', '112', '112, 'i': a', 'b', 'a', 'b, 'forming a pregnant leach solution (, ; , );'}{'b': 18', '118', '12', '12, 'i': a', 'b, 'removing a first leach residue (, ) from the pregnant leach solution (, ); and'}{'b': 12', '112', '12', '12', '22', '122', '34', '134', '34', '134, 'i': b', 'b', 'a', 'b, 'claim-text': [{'b': 12', '12', '22', '122, 'i': a', 'b, 'sub': 1', '2', '3, 'sequentially processing the pregnant leach solution (, ) and/or raffinate (, ) produced therefrom in a first reactor (R) a second reactor (R), and a third reactor (R);'}, {'sub': '1', 'maintaining a pH level of the ...

SELECTIVE EXTRACTION OF CERIUM FROM OTHER METALS

Methods for the extraction of cerium and/or thorium from metal compounds and solutions. A single step or two-step extraction method may be applied to selectively precipitate thorium and/or cerium as hydroxides under controlled pH conditions such that a substantially thorium-free and/or cerium-free rare earth element (REE) solution may be formed, such as for the subsequent separation of individual rare earth elements. 1. A method for the extraction of cerium from a cerium-containing acidic solution , comprising the steps of:contacting the cerium-containing acidic solution with ammonium hydroxide to precipitate at least a portion of the cerium as cerium hydroxide and form a cerium-depleted solution and a cerium hydroxide product; andseparating at least a portion of the cerium hydroxide product from the cerium depleted solution.2. The method recited in claim 1 , wherein the cerium-containing acidic solution is formed by digesting a cerium-containing solid product in an acid.3. The method recited in claim 1 , wherein the cerium-containing acidic solution comprises nitric acid.4. The method recited in claim 1 , wherein claim 1 , before the step of contacting the cerium-containing acidic solution with ammonium hydroxide claim 1 , the cerium-containing acidic solution has a free acid content that is sufficient to dissolve a majority of the cerium and to maintain a majority of the cerium as Ce.5. The method recited in claim 1 , wherein claim 1 , before the step of contacting the cerium-containing acidic solution with ammonium hydroxide claim 1 , the cerium-containing acidic solution has a free acid content that is sufficient to dissolve at least about 95% of the cerium and maintain at least about 95% of the cerium as Ce.6. The method recited in claim 1 , wherein claim 1 , before the step of contacting the cerium-containing acidic solution with ammonium hydroxide claim 1 , the cerium-containing acidic solution has a free acid content of at least about 18%.7. The method ...