Method for recovering gold by solvent extraction

Method for recovering gold by solvent extraction

PROCEDURE FOR THE HYDROGENATION OF A CATALYST USED BY INSATIATED CONNECTIONS ON VEGETABLE BASIS AND FOR THE RECOVERY

METHOD AND APPARATUS FOR TREATING LIQUIDS

EXTRACTION PROCESS

A method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

USE OF A WEAKLY SOUR ONE OF CATION EXCHANGER RESIN FOR THE CHROMATROGRAPHI SEPARATION FROM COAL HYDRATES

Extraction process

The invention relates to a method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

Treatment of degraded oxime metal extractants in process organic solutions

The invention relates to a method for regenerating the extractive potential of an organic hydroxyoxime-based ex- traction solution used in the recovery of metals by liquid- liquid extraction. The method is two-stage, in which a solid hydroxylamine is used in the reaction stage, and the removal of the undesirable compounds generated in the re- action occurs in the second stage by adsorption purification. The method of the invention is suitable for treatment of degraded oxime metal extractants in various process organic solutions both in aldehyde and ketoxime extractant solutions. The method can also be used to treat a mixture of degraded oxime extractants.

METHOD AND APPARATUS FOR REGENERATION OF EXTRACTION SOLUTION IN METAL EXTRACTION PROCESSES

The invention relates to a method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank.

EXTRACTION PROCESS

The invention relates to a method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

Method of preparing a gold-containing solution and process arrangement for recovering gold and silver

The invention relates to a method for preparing a gold- containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

METHOD OF PREPARING A GOLD-CONTAINING SOLUTION AND PROCESS ARRANGEMENT FOR RECOVERING GOLD AND SILVER

The invention relates to a method for preparing a gold- containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

PROCESS FOR HYDROGENATING UNSATURATED PLANT-BASED COMPOUNDS AND REGENERATION OF A USED CATALYST

The invention relates to a process for catalytic hydrogenation of non-hormonal unsaturated plant steroids and unsaturated plant-based fatty acids and triglycerides thereof using a metal catalyst bound to a polymer support containing grafted groups. The invention also relates to regeneration of a used catalyst.

PROCEDURE FOR THE PRODUCTION OF ALKALI METAL OR ALKALI METAL ALKALINE EARTH METAL FORMATES

PROCEDURE FOR THE PRODUCTION OF MULTI-VALUED ALCOHOLS

SULFONIERTES POLYMER RESIN AND ITS PRODUCTION

Method and apparatus for regeneration of extraction solution in metal extraction processes

The invention relates to a method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank.

Method for recovering metals from material containing them

The invention relates to a method by which the valuable metals and any possible precious metals are recovered from a material containing them, such as the mixed matte formed in a smelter. The valuable metals in the material formed in the smelter are leached with an acidic solution containing sulphate and chloride, from which each metal is separated by means of solvent extraction. In leaching,any precious metals contained in the material remain undissolved in the leach residue, from which they are leached with a solution containing hydrochloric acid in oxidizing conditions and separated from the solution by solvent extraction.

Process for hydrogenating unsaturated plant-based compounds and regeneration of a used catalyst

METHOD FOR RECOVERY OF COPPER AND ZINC

The present invention provides a method of recovering copper and zinc from an aqueous sulfate and chloride containing solution.In the first process step zinc and copper are simultaneous extracting with an extraction solution comprising a liquid chelating cation exchanger and a liquid anion exchanger. The extraction is followed by consecutive stripping stages. First the anionic species are washed from the organic phase with one or more aqueous solutions and finally the copper is stripped with an aqueous acidic solution.

VERWENDUNG EINES SCHWACH SAUREN KATIONENAUSTAUSCHERHARZES ZUR CHROMATROGRAPHISCHEN TRENNUNG VON KOHLENHYDRATEN

METHOD FOR RECOVERING GOLD BY SOLVENT EXTRACTION

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

APPARATUS AND METHOD FOR REMOVING IMPURITIES IN CONNECTION WITH LIQUID-LIQUID EXTRACTION OF COPPER

The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid- liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.

PROCESS FOR HYDROGENATING UNSATURATED PLANT-BASED COMPOUNDS AND REGENERATION OF A USED CATALYST

The invention relates to a process for catalytic hydrogenation of non-hormonal unsaturated plant steroids and unsaturated plant-based fatty acids and triglycerides thereof using a metal catalyst bound to a polymer support containing grafted groups. The invention also relates to regeneration of a used catalyst.

Tratamiento de extractantes de metal de oxima degradado en soluciones orgánicas de proceso

...

La invención se refiere a un método para regenerar el potencial extractivo de una solución de extracción basada en hidroxioxima orgánica utilizada en la recuperación de metales mediante extracción líquido-líquido. El método es de dos etapas, en el que se utiliza una hidroxilamina sólida en la etapa de reacción, y la eliminación de los compuestos indeseables generados en la reacción se produce en la segunda etapa mediante purificación por adsorción. El método de la invención es adecuado para el tratamiento de extractantes de metal de oxima degradados en diversas soluciones orgánicas de proceso, tanto en soluciones de extractante de aldehído como de cetoxima. El método también se puede usar para tratar una mezcla de extractantes de oxima degradados.

METHOD AND APPARATUS FOR REGENERATION OF EXTRACTION SOLUTION IN METAL EXTRACTION PROCESSES

The invention relates to a method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank.

RENEWABLE ISOPARAFFINS AS DILUENT IN HYDROMETALLURGICAL LIQUID-LIQUID EXTRACTION PROCESS

The present invention relates to hydrometallurgical technologies wherein liquid-liquid extraction, also called solvent extraction, is used to separate and concentrate metal ions. More particularly the invention relates to solvent extraction of copper and a diluent useful in copper solvent extraction. The invention provides a bio-based composition which fulfills physico-chemical properties that are required for solvent extraction. Moreover, the invention provides a composition, which in addition to providing more environmental friendly alternative, also improves the solvent extraction process of copper.

APPARATUS AND METHOD FOR REMOVING IMPURITIES IN CONNECTION WITH LIQUID-LIQUID EXTRACTION OF COPPER

The invention relates to an apparatus and method for purifying an organic extraction solution containing copper from impurities, including molybdenum, iron, manganese, chloride and nitrite, in an organic extraction solution storage tank (1) having a front wall (5), side walls (6) (7), a back wall (8) and bottom (9), wherein the apparatus is built into the tank, the apparatus comprising at least one removal unit (2,3,41,42) and a mixing device attached to it (11,22,43,44) for mixing together an aqueous solution and the extraction solution into a dispersion; an aqueous solution suction pipe (14,24,45) connected to the mixing device and located in the bottom section of the removal unit and an extraction solution suction pipe (15,27,47) arranged in the extraction solution as well as a dispersion distribution pipe (18,30,51) connected to the mixing device, and directed to counter-flow against the flow of extraction solution fed into the removal unit (2,3,41,42) for scrubbing the extraction solution ...

VERFAHREN ZUR HERSTELLUNG MEHRWERTIGER ALKOHOLE

Method and apparatus for treating liquids

Extraction process

The invention relates to a method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

Method for manufacturing alkali metal or alkaline-earth metal formate

A method for manufacturing alkali metal or alkaline-earth metal formate, starting from a formate anion comprises at least the following sequential steps: A) conversion of a solid anion exchanger to formate form by feeding into it a solution containing a formate anion, B) exchanging the formate anion in the anion exchanger for a replacing anion by feeding into it an alkali metal or alkaline-earth metal salt solution of this replacing anion, C) recovering the alkali metal or alkaline-earth metal formate solution eluted from the anion exchanger during the exchange of the formate anion. The anion exchanger is converted to formate form by feeding into it a sodium formate solution, a formic acid solution or a solution which contains both sodium formate and formic acid. The method can be used for production of potassium formate or calcium formate.

EXTRACTION PROCESS

Process for separation of ammonia gas and a solid adsorbent composition

EXTRACTION PROCESS

The invention relates to a method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

METHOD FOR RECOVERING GOLD BY SOLVENT EXTRACTION

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

METHOD OF PREPARING A GOLD-CONTAINING SOLUTION AND PROCESS ARRANGEMENT FOR RECOVERING GOLD AND SILVER

The invention relates to a method for preparing a gold- containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

Apparatus and method for removing impurities in connection with liquid-liquid extraction of copper

The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid- liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.

RENEWABLE ISOPARAFFINS AS DILUENT IN HYDROMETALLURGICAL LIQUID-LIQUID EXTRACTION PROCESS

The present invention relates to hydrometallurgical technologies wherein liquid-liquid extraction, also called solvent extraction, is used to separate and concentrate metal ions. More particularly the invention relates to solvent extraction of copper and a diluent useful in copper solvent extraction. The invention provides a bio-based composition which fulfills physico-chemical properties that are required for solvent extraction. Moreover, the invention provides a composition, which in addition to providing more environmental friendly alternative, also improves the solvent extraction process of copper.

VERFAHREN ZUR HERSTELLUNG VON ALKALIMETALL- ODER ALKALIMETALL-ERDALKALIMETALLFORMIATEN

Method for recovering metals from material containing them

The invention relates to a method by which the valuable metals and any possible precious metals are recovered from a material containing them, such as the mixed matte formed in a smelter. The valuable metals in the material formed in the smelter are leached with an acidic solution containing sulphate and chloride, from which each metal is separated by means of solvent extraction. In leaching,any precious metals contained in the material remain undissolved in the leach residue, from which they are leached with a solution containing hydrochloric acid in oxidizing conditions and separated from the solution by solvent extraction.

Process for hydrogenating unsaturated plant-based compounds and regeneration of a used catalyst

Sulphonated polymer resin and preparation thereof

The invention relates to sulphonated polymer resins, particularly polymer resins with a sulphonated shell layer, and the preparation thereof. Resins according to the invention are prepared by sulphonating a polymer in a non-swollen state with substantially pure gaseous sulphur trioxide substantially in the shell layer of the polymer particles. The polymer to be sulphonated can be for example a styrene-DVB copolymer. The resins according to the invention can be used for example as chromatographic resins, ion-exchange resins and catalyst resins.

Plant sterol derivatives and use thereof

VERFAHREN ZUR HYDRIERUNG VON UNGESÄTTIGTEN VERBINDUNGEN AUF PFLANZLICHER BASIS UND ZUR REGENERIERUNG EINES VERWENDETEN KATALYSATORS

Sulphonated polymer resin and preparation thereof

Method for recovering gold by solvent extraction

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

Process for the preparation of polyvalent alcohols

Use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates

Method for recovering gold by solvent extraction

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

Treatment of degraded oxime metal extractants in process organic solutions

The invention relates to a method for regenerating the extractive potential of an organic hydroxyoxime-based ex- traction solution used in the recovery of metals by liquid- liquid extraction. The method is two-stage, in which a solid hydroxylamine is used in the reaction stage, and the removal of the undesirable compounds generated in the re- action occurs in the second stage by adsorption purification. The method of the invention is suitable for treatment of degraded oxime metal extractants in various process organic solutions both in aldehyde and ketoxime extractant solutions. The method can also be used to treat a mixture of degraded oxime extractants.

Method of preparing a gold-containing solution and process arrangement for recovering gold and silver

The invention relates to a method for preparing a gold- containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

METHOD FOR RECOVERING GOLD BY SOLVENT EXTRACTION

EXTRACTION PROCESS

Metodo para tratar solucion organica de extraccion utilizada en extraccion liquido-liquido que comprende etapa de reaccion en la cual solucion de extraccion se pone en contacto con solucion acuosa de hidroxilamina, etapa de separacion y etapa de purificacion por adsorcion de sustancias dañinas de reacciones de re-oximacion, y aparato.

Método para tratar solución orgánica de extracción utilizada en extracción líquido-líquido que comprende etapa de reacción en la cual solución de extracción se pone en contacto con solución acuosa de hidroxilamina, etapa de separación y etapa de purificación por adsorción de sustancias dañinas de reacción de re-oximación, y aparato.

VERFAHREN ZUR HERSTELLUNG VON ALKALIMETALL- ODER ALKALIMETALL-ERDALKALIMETALLFORMIATEN

PROCESS FOR HYDROGENATING UNSATURATED PLANT-BASED COMPOUNDS AND REGENERATION OF A USED CATALYST

The invention relates to a process for catalytic hydrogenation of non- hormonal unsaturated plant steroids and unsaturated plant-based fatty acids and triglycerides thereof using a metal catalyst bound to a polymer support containing grafted groups. The invention also relates to regeneration of a used catalyst. © KIPO & WIPO 2007 ...

VERFAHREN ZUR HYDRIERUNG VON UNGESÄTTIGTEN VERBINDUNGEN AUF PFLANZLICHER BASIS UND ZUR REGENERIERUNG EINES VERWENDETEN KATALYSATORS

Method for recovering gold by solvent extraction

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

Apparatus and method for removing impurities in connection with liquid-liquid extraction of copper

The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid-liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.

METHOD AND APPARATUS FOR REGENERATION OF EXTRACTION SOLUTION IN METAL EXTRACTION PROCESSES

The invention relates to a method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank. 1. A method for treating organic extraction solution used in liquid-liquid extraction , where the extraction reagent of the solution is hydroxyoxime-based and where the metal extraction properties of said solution have been changed chemically in the process conditions , wherein treatment of the extraction solution to restore the physical and metal extraction properties of the extraction solution to the original level takes place in two stages , of which the first stage is a reaction stage in which the extraction solution is contacted with an aqueous solution of hydroxylamine or a compound thereof , whereby the aldehydes and/or ketones formed in the solution under process conditions are reoximated , after which the solutions are separated and the extraction solution is treated in a second stage or adsorption purification stage , in which the extraction solution is brought into contact with some adsorption material in solid form , by means of which the extraction solution is purified from compounds of the harmful substances generated in the reoximation reactions.2. A method according to claim 1 , wherein the adsorption material in solid form is at least one of the following: bentonite claim 1 , diatomite claim 1 , aluminium silicate claim 1 , metal oxide claim 1 , non-metal oxide claim 1 , activated carbon claim 1 , polymeric adsorbent and polymeric ion exchange resin.3. A method according to claim 1 , wherein the hydroxylamine compound is at ...

Metodo para extraer oro mediante solucion acuosa basada en cloruro acido o suspension que comprende un diester 2,2,4-trialquil-1,3-pentanodiol, en que la solucion aurifera formada es depurada en solucion acida, luego el oro se separa en agua desde donde se reduce formando oro puro.

SULFONIERTES POLYMERHARZ UND DESSEN HERSTELLUNG

Isoparafinas renovables como diluyente en el proceso de extracción hidrometalúrgica líquido-líquido.

LA PRESENTE INVENCIÓN SE REFIERE A TECNOLOGÍAS HIDROMETALÚRGICAS EN LAS QUE LA EXTRACCIÓN LÍQUIDO-LÍQUIDO, TAMBIÉN LLAMADA EXTRACCIÓN CON SOLVENTE, SE UTILIZA PARA SEPARAR Y CONCENTRAR IONES METÁLICOS. MÁS PARTICULARMENTE, LA INVENCIÓN SE REFIERE A LA EXTRACCIÓN CON SOLVENTE DE COBRE Y UN DILUYENTE ÚTIL EN LA EXTRACCIÓN CON SOLVENTE DE COBRE. LA INVENCIÓN PROPORCIONA UNA COMPOSICIÓN DE BASE BIOLÓGICA QUE CUMPLE CON LAS PROPIEDADES FÍSICO-QUÍMICAS QUE SE REQUIEREN PARA LA EXTRACCIÓN CON SOLVENTE. ADEMÁS, LA INVENCIÓN PROPORCIONA UNA COMPOSICIÓN QUE, ADEMÁS DE PROPORCIONAR UNA ALTERNATIVA MÁS AMIGABLE CON EL MEDIO AMBIENTE, TAMBIÉN MEJORA EL PROCESO DE EXTRACCIÓN CON SOLVENTE DEL COBRE.

Method for manufacturing alkali metal or alkaline-earth metal formate

A method for manufacturing alkali metal or alkaline-earth metal formate, starting from a formate anion comprises at least the following sequential steps: A) conversion of a solid anion exchanger to formate form by feeding into it a solution containing a formate anion, B) exchanging the formate anion in the anion exchanger for a replacing anion by feeding into it an alkali metal or alkaline-earth metal salt solution of this replacing anion, C) recovering the alkali metal or alkaline-earth metal formate solution eluted from the anion exchanger during the exchange of the formate anion. The anion exchanger is converted to formate form by feeding into it a sodium formate solution, a formic acid solution or a solution which contains both sodium formate and formic acid. The method can be used for production of potassium formate or calcium formate.

VERFAHREN ZUR HERSTELLUNG MEHRWERTIGER ALKOHOLE

SULFONIERTES POLYMERHARZ UND DESSEN HERSTELLUNG

METHOD AND APPARATUS FOR REGENERATION OF EXTRACTION SOLUTION IN METAL EXTRACTION PROCESSES

A method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction are provided. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank. 1. An apparatus for treating organic extraction solution used in liquid-liquid extraction , where the extraction reagent of the solution is hydroxyoxime-based and where the metal extraction properties of said solution have been changed chemically in the process conditions , wherein in order to restore the physical and metal extraction properties of the extraction solution said solution is treated in two stages , whereby in the first of which , the reaction stage , the mixing of the extraction solution to be reoximated and an aqueous solution of hydroxylamine or a compound thereof , takes place in a mixing tank , which is equipped with a spiral-shaped mixer , after which the solutions are separated from each other and the extraction solution is treated in an adsorption purification stage mixing tank , in which the mixing of the extraction solution and some adsorption material in solid form is carried out with a spiral-shaped mixer.2. An apparatus according to claim 1 , wherein a pH electrode is installed in the apparatus for measuring the pH value of the aqueous hydroxylamine solution.3. An apparatus according to claim 1 , wherein a pH electrode is installed in the mixing tank.4. An apparatus according to claim 1 , wherein the apparatus comprises one mixing tank claim 1 , whereby both the reaction stage and the adsorption stage are implemented in the same mixing tank.5. An apparatus according to claim 1 , wherein the apparatus comprises two mixing tanks: ...

Method for recovery of copper and zinc

The present invention provides a method of recovering copper and zinc from an aqueous sulfate and chloride containing solution. In the first process step zinc and copper are simultaneous extracting with an extraction solution comprising a liquid chelating cation exchanger and a liquid anion exchanger. The extraction is followed by consecutive stripping stages. First the anionic species are washed from the organic phase with one or more aqueous solutions and finally the copper is stripped with an aqueous acidic solution.

Aparato para purificar una solucion de extraccion organica que contiene cobre de sustancias de impurezas tales como el molibdeno, dicho aparato esta construido en el tanque, comprendiendo por lo menos una unidad de remocion y un dispositivo mezclador unido a este; y metodo asociado.

SE DESCRIBE UN APARATO SIMPLE, PARA PURIFICAR UNA SOLUCIÓN DE EXTRACCIÓN ORGÁNICA QUE CONTIENE COBRE
DE SUSTANCIAS DE IMPUREZAS TALES COMO EL MOLIBDENO, QUE OMITE COMPLETAMENTE LA ETAPA DE DEPURACIÓN
QUE COMPRENDE MEZCLADORES Y UN SEDIMENTADOR QUE USUALMENTE SE INCLUYE EN LA EXTRACCIÓN DE LIQUIDO-LIQUIDO,
QUE CONSISTE EN UN TANQUE DE ALMACENAMIENTO DE LA SOLUCIÓN DE EXTRACCIÓN ORGÁNICA (1), EL CUAL
POSEE UNA PARED FRONTAL (5), PAREDES LATERALES (6) Y (7) MÁS UNA PARED POSTERIOR (8) Y UN FONDO (9), EN
DONDE EL APARATO ESTÁ CONSTRUIDO EN EL TANQUE, COMPRENDIENDO POR LO MENOS UNA UNIDAD DE REMOCIÓN
(2,3,41,42) Y UN DISPOSITIVO MEZCLADOR UNIDO A ESTE (11,22,43,44) PARA MEZCLAR ENTRE SI LA SOLUCIÓN
ACUOSA Y LA SOLUCIÓN DE EXTRACCIÓN EN UNA DISPERSIÓN; UN TUBO DE SUCCIÓN DE LA SOLUCIÓN ACUOSA (14, 24,
45) CONECTADO CON EL DISPOSITIVO MEZCLADOR Y LOCALIZADO EN LA SECCIÓN DE FONDO DE LA UNIDAD DE
REMOCIÓN Y UN TUBO DE SUCCIÓN DE LA SOLUCIÓN ...

Renewable isoparaffins as diluent in hydrometallurgical liquid-liquid extraction process

The present disclosure relates to hydrometallurgical technologies wherein liquid-liquid extraction, also called solvent extraction, is used to separate and concentrate metal ions. Exemplary embodiments relate to solvent extraction of copper and a diluent useful in copper solvent extraction. A bio-based composition can fulfil physico-chemical properties that are desired for solvent extraction. Moreover, a composition is disclosed, which in addition to providing more environmental friendly alternative, can also improve the solvent extraction process of copper.

APPARATUS AND METHOD FOR REMOVING IMPURITIES IN CONNECTION WITH LIQUID-LIQUID EXTRACTION OF COPPER

The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid-liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.

METHOD FOR RECOVERY OF COPPER AND ZINC

The present invention provides a method of recovering copper and zinc from an aqueous sulfate and chloride containing solution. In the first process step zinc and copper are simultaneous extracting with an extraction solution comprising a liquid chelating cation exchanger and a liquid anion exchanger. The extraction is followed by consecutive stripping stages. First the anionic species are washed from the organic phase with one or more aqueous solutions and finally the copper is stripped with an aqueous acidic solution. 1. A method of recovering copper and zinc from an aqueous sulfate and chloride containing solution , comprising the steps of:(a) providing an aqueous sulfate and chloride containing solution comprising copper and zinc;(b) extracting the aqueous sulfate and chloride containing solution with an extraction solution comprising a liquid chelating cation exchanger and a liquid anion exchanger to obtain a loaded organic phase comprising zinc and copper and a first aqueous phase;(c) washing zinc from the loaded organic phase with an aqueous solution to obtain a zinc-depleted organic phase and zinc and chloride containing second aqueous phase;(d) stripping copper from the zinc-depleted organic phase with an aqueous acidic solution to obtain a zinc and copper depleted organic phase and a copper-containing third aqueous phase;(e) recovering zinc from the zinc and chloride containing second aqueous phase and recovering copper from the copper containing third aqueous phase.2. The method as claimed in claim 1 , wherein the chloride concentration of the aqueous sulfate and chloride containing solution comprising copper and zinc is from 1 to 175 g/L.3. The method as claimed in claim 1 , wherein the sulfate concentration of the aqueous sulfate and chloride containing solution comprising copper and zinc is from 40 to 300 g/L.4. The method as claimed in claim 1 , wherein the liquid chelating cation exchanger is hydroxyoxime.5. The method as claimed in claim 4 , wherein ...

Método de recuperación de cobre y zinc.

Método para la recuperación selectiva de uranio de una solución de uranio acuosa acida que comprende una concentracion de uranio menor a 50 mg/l, introducir un agente de reduccion realizar la etapa de extraccion y dividir la solucion de extraccion cargada en una primera parte que se recicla y en una segunda parte que va a una etapa de depuracion.

Método para la recuperación selectiva de uranio de una solución de uranio acuosa ácida que comprende una concentración de uranio menor a 50 mg/l, introducir un agente de reducción realizar la etapa de extracción en una o dos etapas y dividir la solución de extracción en una primera parte que se recicla antes que la etapa de depuración regrese a la etapa de extracción y en una segunda parte que va a la etapa de depuración.

Método para preparar una solución que contiene oro y disposición de proceso para recuperar oro y plata

METODO PARA PREPARAR UNA SOLUCION QUE CONTIENE ORO A PARTIR DE MATERIAS PRIMAS AURIFERAS, QUE COMPRENDE: (A) UNA ETAPA DE LIXIVIACION DE ORO, DONDE LA MATERIA PRIMA AURIFERA SE SOMETE A LIXIVIACION CON CLORURO OXIDATIVO EN UN LICOR DE LIXIVIACION ACUOSA EN LAS SIGUIENTES CONDICIONES: EL LICOR DE LIXIVIACION ACUOSA CONTIENE IONES CUPRICOS DISUELTOS (Cu+2 ), CLORURO (Cl-) Y BROMURO (Br-), EL PH ESTA DENTRO DEL RANGO DONDE EL ION CUPRICO NO SE PRECIPITA, EL POTENCIAL DE OXIDACION ES POR LO MENOS 450 mV PT vs. Ag/AgCl, PARA PROPORCIONAR UNA SOLUCION QUE CONTIENE ORO CONTENIENDO OPCIONALMENTE ADEMAS PLATA, (B) UNA ETAPA DE SEPARACION LIQUIDO/SOLIDO, DONDE LA SOLUCION QUE CONTIENE ORO SE SEPARA DEL MATERIAL SOLIDO NO DISUELTO; (C) UNA ETAPA DE RECUPERACION DE ORO, DONDE EL ORO SE RECUPERA DE LA SOLUCION QUE CONTIENE ORO DE LA ETAPA (B) PARA OBTENER UNA SOLUCION ORGANICA AURIFERA Y UNA SOLUCION DE LIXIVIACION AGOTADA DE ORO QUE CONTIENE Cu+2 , Cl- Y Br-; Y (C') UNA ETAPA DE EVAPORACION, DONDE ...

Process for the preparation of polyvalent alcohols

The invention relates to a process for the preparation of polyvalent alcohols by hydrogenation of an aldehyde. According to the invention said aldehyde is obtained by aldolisation reaction of an aldehyde containing an α hydrogen atom and having the formula R 1 CHO, or the mixture of said aldehyde with a second different aldehyde having the formula or R 2 CHO, wherein R 1 is selected from alkyl having 1-12 carbon atoms, cycloalkyl, aryl and aralkyl having 1-14 carbon atoms, and R 2 is selected from H, alkyl having 1-12 carbon atoms, cycloalkyl, aryl and aralkyl having 1-14 carbon atoms, said aldolisation being carried out in the presence of a weak base anion exchange resin, and the hydrogenation being carried out in the presence of a solvent and a hydrogenation catalyst.

Method of preparing a gold-containing solution and process arrangement for recovering gold and silver

The invention relates to a method for preparing a gold-containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

Method of regeneration an organic extraction solution that has been used in a liquid-liquid extraction process

The invention relates to a method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank.

RENEWABLE ISOPARAFFINS AS DILUENT IN HYDROMETALLURGICAL LIQUID-LIQUID EXTRACTION PROCESS

The present disclosure relates to hydrometallurgical technologies wherein liquid-liquid extraction, also called solvent extraction, is used to separate and concentrate metal ions. Exemplary embodiments relate to solvent extraction of copper and a diluent useful in copper solvent extraction. A bio-based composition can fulfil physico-chemical properties that are desired for solvent extraction. Moreover, a composition is disclosed, which in addition to providing more environmental friendly alternative, can also improve the solvent extraction process of copper. 1. A biobased composition for liquid-liquid extraction of metals , the biobased composition comprising:5-40 vol-% metal extraction reagent; and60-95 vol % diluent, wherein the diluent includes:10%-100 wt % first organic diluent containing hydrocarbons having 80-98 wt % C15-C20 hydrocarbons with at least 60 wt % isoparaffins from a total amount of the hydrocarbons; andoptionally, 0-90 wt % second organic diluent component having naphthenes more than 10 wt %.2. The composition of claim 1 , wherein the first organic diluent comprises:0 wt %-5 wt % naphthenes, and 100-95 wt % paraffins.3. The composition of claim 1 , wherein a 14C isotope content of the first organic diluent is more than 90%.4. The composition of claim 2 , wherein the first organic diluent comprises:paraffins, wherein of the total paraffins 5-15 wt % is C15, 10-35 wt % is C16, 10-30 wt % is C17, 25-45 wt % is C18, more than 0-5 wt % is C19 and more than 0-5 wt % is C20.5. The composition of claim 1 , wherein a total amount of isoparaffins in the first organic diluent is at least 85 wt % claim 1 , 90 wt % claim 1 , 93 wt % and 95 wt %.6. The composition of claim 1 , wherein the first organic diluent comprises:C15 hydrocarbons having 5 wt %-20 wt % n-paraffins and 80 wt %-95 wt % i-paraffins;C16 hydrocarbons having 0.5 wt %-15 wt % n-paraffins and 85 wt %-99.5 wt % i-paraffins;C17 hydrocarbons having 3 wt %-15 wt % n-paraffins and 85 wt %-97 wt % i- ...

Treatment of degraded oxime metal extractants in process organic solutions

The invention relates to a method for regenerating the extractive potential of an organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which a solid hydroxylamine is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The method of the invention is suitable for treatment of degraded oxime metal extractants in various process organic solutions both in aldehyde and ketoxime extractant solutions. The method can also be used to treat a mixture of degraded oxime extractants.

Use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates

The invention relates to the use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates. In the invention the hydrophilic/hydrophobic interaction of carbohydrates, sugars and sugar alcohols with the weakly acid cation exchange resin is utilized. The weakly acid cation exchange resin is used for separation of hydrophobic saccharides, such as deoxy, methyl and anhydrosugars and anhydrosugaralcohols from more hydrophilic saccharides.

Extraction process

A method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

Method for recovering metals from material containing them

The invention relates to a method by which the valuable metals and any possible precious metals are recovered from a material containing them, such as the mixed matte formed in a smelter. The valuable metals in the material formed in the smelter are leached with an acidic solution containing sulphate and chloride, from which each metal is separated by means of solvent extraction. In leaching, any precious metals contained in the material remain undissolved in the leach residue, from which they are leached with a solution containing hydrochloric acid in oxidizing conditions and separated from the solution by solvent extraction.

Method for recovering gold by solvent extraction

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

METHOD OF PREPARING A GOLD-CONTAINING SOLUTION AND PROCESS ARRANGEMENT FOR RECOVERING GOLD AND SILVER

The invention relates to a method for preparing a gold-containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver. 1. A method of preparing a gold-containing solution froth gold-bearing raw materials , wherein the method comprises(a) a gold leaching step, wherein the gold-bearing raw material is subjected to oxidative chloride leaching in an aqueous leaching liquor in the following conditions:(i) the aqueous leaching liquor contains dissolved cupric ions (Cu2+), chloride (CI″) and bromide (Br″),(ii) pH is within a range wherein the cupric ion does not precipitate, (iii) the oxidation potential is at least 450 mV Pt vs. Ag/AgCI, to provide a gold-containing solution optionally further containing silver,(b) a liquid/solid separation step, wherein the gold-containing solution is separated from the undissolved solid material;(c) a gold recovery step, wherein gold is recovered from the gold-containing solution from step (b) to obtain a gold-bearing organic solution and a gold-depleted leach solution containing Cu2+, CI″ and Br″; and(c′) an evaporation step, wherein gold-depleted leach solution from step (c) containing Cu2+, CI″ and Br″ is evaporated for removing excess water; and(d) a circulation step, wherein the gold-depleted leach solution obtained from the evaporation step containing Cu2+, CI″ and Br″ is circulated to the leaching step (a).2. The method as claimed in claim 1 , wherein the gold-bearing raw material is selected from ores claim 1 , concentrates claim 1 , scraps claim 1 , recycled materials leach residues claim 1 , tailings claim 1 , such as flotation tailings claim 1 , and refractory gold materials claim 1 , which refractory gold materials have been pretreated by pressure oxidation claim 1 , roasting and/ ...

Treatment of degraded oxime metal extractants in process organic solutions

The invention relates to a method for regenerating the extractive potential of an organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which a solid hydroxylamine is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The method of the invention is suitable for treatment of degraded oxime metal extractants in various process organic solutions both in aldehyde and ketoxime extractant solutions. The method can also be used to treat a mixture of degraded oxime extractants.

Plant sterol derivatives and use thereof

The invention relates to hydrophilic sterol derivatives that consist of naturally occurring molecules and that are esters of a plant sterol and a fruit acid. The invention further relates to the preparation and use of these sterol derivatives.

Treatment of decomposed oxime metal extracts in organic process solutions

Renewable isoparaffins as diluent in hydrometallurgical liquid-liquid extraction process

Use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates

The invention relates to the use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates. In the invention the hydrophilic/hydrophobic interaction of carbohydrates, sugars and sugar alcohols with the weakly acid cation exchange resin is utilised. The weakly acid cation exchange resin is used for separation of hydrophobic saccharides, such as deoxy, methyl and anhydrosugars and anhydrosugaralcohols from more hydrophilic saccharides.

The extraction process

Treatment of degraded oxime metal extractants in process organic solutions

Use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates

Renewable isoparaffins as diluent in hydrometallurgical liquid-liquid extraction process

The present invention relates to hydrometallurgical technologies wherein liquid-liquid extraction, also called solvent extraction, is used to separate and concentrate metal ions. More particularly the invention relates to solvent extraction of copper and a diluent useful in copper solvent extraction. The invention provides a bio-based composition which fulfills physico-chemical properties that are required for solvent extraction. Moreover, the invention provides a composition, which in addition to providing more environmental friendly alternative, also improves the solvent extraction process of copper.

Method for recovering gold by solvent extraction

Plant sterol derivatives and use thereof

The invention relates to hydrophilic sterol derivatives that consist of naturally occurring molecules and that are esters of a plant sterol and a fruit acid. The invention further relates to the preparation and use of these sterol derivatives.

Process for hydrogenating unsturated plant-based compounds and regeneration of a used catalyst.

A method and an arrangement for monitoring of a metallurgical separation process

The present invention relates to the field of mineral engineering and metallurgy and metallurgical technologies in general and to extraction of metal com¬ pounds from ores or concentrates by metallurgical processes, and more particularly to a method and an arrangement for monitoring of a metallurgical separation process. An arrangement for monitoring of a metallurgical separation process according to the present invention comprises at least one X-ray tube (23), (25), (27), (29), (34), (40), (42) arranged to transmit X-ray radiation into of said metallurgical process separation equipment (7), (19), (31), (36), and at least one X-ray sensor unit (24), (26), (28), (30), (35), (41), (43) arranged opposite to said at least one X-ray tube (23), (25), (27), (29), (34), (40), (42), said at least one X-ray sensor unit (24), (26), (28), (30), (35), (41), (43) arranged to detect X-ray radiation travelling inside said metallurgical separation process equipment (7), (19), (31), (36) and through at least a portion of said metallurgical separation process medium (8), (11), (12), (22), (33), (38), (39).

TREATMENT OF DEGRADED OXIME METAL EXTRACTANTS IN ORGANIC PROCESS SOLUTIONS

La invencion se refiere a un metodo para regenerar el potencial extractivo de una solucion de extraccion basada en hidroxioxima organica utilizada en la recuperacion de metales mediante extraccion liquido-liquido. El metodo es de dos etapas, en el que se utiliza una hidroxilamina solida en la etapa de reaccion, y la eliminacion de los compuestos indeseables generados en la reaccion se produce en la segunda etapa mediante purificacion por adsorcion. El metodo de la invencion es adecuado para el tratamiento de extractantes de metal de oxima degradados en diversas soluciones organicas de proceso, tanto en soluciones de extractante de aldehido como de cetoxima. El metodo tambien se puede usar para tratar una mezcla de extractantes de oxima degradados

A method and an arrangement for monitoring of a metallurgical froth flotation process in a metallurgical flotation cell

The present invention relates to the field of mineral engineering and metallurgy and metallurgical technologies in general and to extraction of metal compounds from ores or concentrates by metallurgical processes, and more particularly to a method and an arrangement for monitoring of a metallurgical froth flotation process in a metallurgical flotation cell. An arrangement for monitoring of a metallurgical froth flotation process in a metallurgical flotation cell (4) according to the present invention comprises at least one X-ray tube (10), (12), (14), (16), said at least one X-ray tube (10), (12), (14), (16) being arranged to transmit X-ray radiation into said metallurgical flotation cell (4); at least one X-ray sensor unit (11), (13), (15), (17) arranged to detect X-ray radiation travelling inside said metallurgical flotation cell (4); and a sensor data processing unit, which said sensor data processing unit provides a two- or three dimensional image related to the attenuation of X-rays by the process slurry (5) and metallurgical flotation froth (8) inside said metallurgical flotation cell (4) based on the detected X-ray radiation data; wherein at least one of said at least one X-ray tube (10), (12), (14), (16) and at least one X-ray sensor unit (11), (13), (15), (17) is arranged inside said metallurgical flotation cell (4).

Treatment of degraded oxime metal extractants in process organic solutions

The invention relates to a method for regenerating the extractive potential of an organic hydroxyoxime-based ex- traction solution used in the recovery of metals by liquid- liquid extraction. The method is two-stage, in which a solid hydroxylamine is used in the reaction stage, and the removal of the undesirable compounds generated in the re- action occurs in the second stage by adsorption purification. The method of the invention is suitable for treatment of degraded oxime metal extractants in various process organic solutions both in aldehyde and ketoxime extractant solutions. The method can also be used to treat a mixture of degraded oxime extractants.

EXTRACTION PROCESS

SE REFIERE A UN METODO PARA LA RECUPERACION SELECTIVA DE URANIO DE UNA SOLUCION DE URANIO ACUOSA ACIDA BASADA EN SULFATO QUE CONTIENE HIERRO Y OTROS METALES POR MEDIO DE EXTRACCION CON SOLVENTE, EN EL QUE EL EXTRACTANTE USADO EN LA SOLUCION DE EXTRACCION ORGANICA ES BIS (2-ETILEXIL) FOSFATO Y UN OXIDO DE TRIALQUIL FOSFINA LIQUIDO Y RAMIFICADO ES EL AGENTE DE MODIFICACION. LA CONCENTRACION DE URANIO EN LA SOLUCION DE ALIMENTACION ES MENOS DE 50 mg/L Y UN AGENTE DE REDUCCION SE INTRODUCE EN LA SOLUCION ACUOSA Y/O DE EXTRACCION PARA PREVENIR LA OXIDACION PERMANENTE DE HIERRO A TRIVALENTE. EN EL METODO LA MAYOR PARTE DE LA SOLUCION DE EXTRACCION SE HACE CIRCULAR EN UN CIRCUITO QUE CONSISTE DE LA ETAPA DE EXTRACCION Y EL TANQUE DE ALMACENAMIENTO Y SOLAMENTE UNA PEQUENA PARTE DE LA SOLUCION DE EXTRACCION CARGADA DE URANIO ES DIRIGIDA A LA DEPURACION Y EXTRACCION REFERS TO A METHOD FOR THE SELECTIVE RECOVERY OF URANIUM FROM A SULPHATE-BASED ACIDIC AQUEOUS URANIUM SOLUTION CONTAINING IRON AND OTHER METALS BY MEANS OF SOLVENT EXTRACTION, IN WHICH THE EXTRACTANT USED IN THE EXTRACTION SOLUTION IS ORGANIC -ETILEXIL) PHOSPHATE AND A LIQUID AND BRANCHED TRIALKYL PHOSPHINE OXIDE IS THE MODIFICATION AGENT. THE CONCENTRATION OF URANIUM IN THE FEEDING SOLUTION IS LESS THAN 50 mg / L AND A REDUCING AGENT IS INTRODUCED IN THE AQUEOUS AND / OR EXTRACTION SOLUTION TO PREVENT PERMANENT OXIDATION OF IRON TO TRIVALENT. IN THE METHOD, THE MOST PART OF THE EXTRACTION SOLUTION IS MADE CIRCULATED IN A CIRCUIT THAT CONSISTS OF THE EXTRACTION STAGE AND THE STORAGE TANK AND ONLY A SMALL PART OF THE URANIUM-LOADED EXTRACTION SOLUTION IS DIRECTED TO DEPURIFICATION.

Renewable isoparaffins as diluent in hydrometallurgical liquid-liquid extraction process

Apparatus and method for removing impurities in connection with liquid-liquid extraction of copper

The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid- liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.

Method of preparing a gold-containing solution and process arrangement for recovering gold and silver

The invention relates to a method for preparing a gold- containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

Ανανεωσιμες ισοπαραφινες ως αραιωτικα στην υδρομεταλλουργικη διαδικασια εκχυλισης υγρου-υγρου

Η παρούσα κοινοποίηση αφορά στις υδρομεταλλουργικές τεχνολογίες, όπου η εκχύλιση υγρού-υγρού, αποκαλούμενη επίσης εκχύλιση με διαλύτη, χρησιμοποιείται για τον διαχωρισμό και τη συμπύκνωση ιόντων μετάλλων. Οι υποδειγματικές ενσωματώσεις αφορούν στην εκχύλιση χαλκού με διαλύτη και σε ένα αραιωτικό χρήσιμο στην εκχύλιση χαλκού με διαλύτη. Μια βιολογικής βάσης σύνθεση μπορεί να εκπληρώνει τις φυσικοχημικές ιδιότητες που επιδιώκονται για την εκχύλιση διαλύτη. Επιπλέον, κοινοποιείται σύνθεση, η οποία εκτός από την παροχή περισσότερο φιλικής προς το περιβάλλον εναλλακτικής λύσης, μπορεί επίσης να βελτιώνει τη διαδικασία εκχύλισης χαλκού με διαλύτη.

Menetelmä kaliumformiaatin valmistamiseksi

Verfahren zur herstellung mehrwertiger alkohole

Fremgangsmåde til fremstilling af alkalimetal- eller jordalkalimetalformiater

Verfahren zur hydrierung von ungesättigten verbindungen auf pflanzlicher basis und zur regenerierung eines verwendeten katalysators

Method and Arrangements for Monitoring a Hydrometallurgical Liquid-Liquid Extraction Process

Fremgangsmåte for å fremstille alkalimetall- eller jordalkalimetall-formiat

Metodo para fabricar formiato de un metal alcalino o de un metal alcalinoterreo.

Un método para la fabricación de formiato de metal alcalino o metal alcalinotérreo, a partir de un anión formiato, caracterizado porque el método comprende al menos las siguientes etapas secuenciales: A) Convertir un intercambiador aniónico sólido de base fuerte a la forma formiato alimentándole una disolución que contiene un anión formiato, B) Intercambiar del anión formiato por un anión reemplazante en el intercambiador aniónico, alimentándole una disolución de sal de metal alcalino o metal alcalinotérreo de este anión reemplazante, C) Recuperar de la disolución de formiato de metal alcalino o metal alcalinotérreo eluído del intercambiador aniónico durante el intercambio del anión formiato.

Method for manufacturing alkali metal or alkaline-earth metal formate

A method for manufacturing alkali metal or alkaline-earth metal formate, starting from a formate anion comprises at least the following sequential steps: A) conversion of a solid anion exchanger to formate form by feeding into it a solution containing a formate anion, B) exchanging the formate anion in the anion exchanger for a replacing anion by feeding into it an alkali metal or alkaline-earth metal salt solution of this replacing anion, C) recovering the alkali metal or alkaline-earth metal formate solution eluted from the anion exchanger during the exchange of the formate anion. The anion exchanger is converted to formate form by feeding into it a sodium formate solution, a formic acid solution or a solution which contains both sodium formate and formic acid. The method can be used for production of potassium formate or calcium formate.

Metodo para a manufactura do formiato de um metal alcalino ou metal alcalinoterroso

Menetelmä kaliumformiaatin valmistamiseksi

Verfahren zur herstellung von alkalimetall- oder alkalimetall-erdalkalimetallformiaten

Menetelmä ja järjestely hydrometallurgisen neste-nesteuuttoprosessin valvontaan

Sulfoniertes polymerharz und dessen herstellung

Uuttoprosessi

Menetelmä ja järjestely hydrometallurgisen prosessin valvontaan