СПОСОБ ПОЛУЧЕНИЯ ДЕСЯТИВОДНОГО ТРИНАТРИЙФОСФАТА

Изобретение относится к технике получения трехзамещенного фосфата натрия нейтрализацией фосфорной кислоты содой до динатрийфосфата и гидроксидом натрия до тринатрийфосфата, выделением кристаллов тринатрийфосфата после охлаждения нейтрализованного раствора. Способ заключается в нейтрализации раствора динатрийфосфата первоначально насыщенным раствором тринатрийфосфата при температуре 60-65°С до соотношения Na2O/Р2О5=2,3-2,5, а затем при температуре 70-80°С раствором гидроксида натрия и выделении тринатрийфосфата охлаждением нейтрализованного раствора со скоростью 7-9 град./час до температуры 53°С. Применение способа позволяет увеличить скорость фильтрации суспензии фосфата и соответственно производительность процесса в 1,2-1,4 раза, производительность фильтрации в 1,4-1,5 раза и повысить содержание Р2O5 в продукте до 20,3-20,6 мас.%. 1 табл.

КАТОДНЫЙ МАТЕРИАЛ ДЛЯ ЛИТИЙ-ИОННЫХ АККУМУЛЯТОРОВ НА ОСНОВЕ МОДИФИЦИРОВАННЫХ ФОСФАТОВ

Изобретение относится к активному материалу на основе литированного фосфата ванадия с углеродным покрытием для использования в составе положительной активной массы литий-ионных аккумуляторов. Кристаллы литированного фосфата ванадия дополнительно модифицированы катионом Naпо подрешетке лития, одним или несколькими катионами из группы, содержащей Mg, Al, Yи La,по подрешетке ванадия, и анионом Fили Clпо подрешетке фосфата, и представляют собой соединение состава LiNaVM(PO)Hal/C, где М - один или несколько металлов из группы, содержащей Mg, Al, Y, La; Hal = F, Cl; 0 Подробнее

Способ получения фосфатосиликата циркония и натрия со структурой NASICON

Изобретение относится к технологии получения материалов состава Na1+хZr2SiхР3-хO12, где 0<х<3, обладающих суперионной проводимостью, которые могут использоваться в качестве твёрдых электролитов в натрий-ионных батареях, химической очистке, химическом зондировании и обработке радиоактивных отходов. Способ получения фосфатосиликатов циркония и натрия состава Na1+xZr2SixP3–xO12 со структурой NASICON включает последовательное растворение в этиловом спирте ацетилацетоната циркония(IV), олеата натрия, трибутилфосфата, тетраэтоксисилана и канифоли, отгонку растворителя при температуре 80°С, термообработку при 500ºС в течение 30 мин и пиролиз при 1000ºС в течение 30 мин. Технический результат состоит в уменьшении времени синтеза, получении широкого спектра фосфатосиликатов циркония и натрия со структурой NASICON с чистым фазовым составом продукта. 1 табл., 6 пр.

СПОСОБ ПОЛУЧЕНИЯ ТРИНАТРИЙФОСФАТА

Заявляемое изобретение относится к области технологии неорганических веществ, а именно к способам получения тринатрийфосфата на основе фосфорной кислоты, используемого в основном в процессах водоподготовки. Сущность изобретения состоит в нейтрализации фосфорной кислоты при 70-100°С кальцинированной содой, отделении примесных компонентов, охлаждении раствора до 30-35oС с кристаллизацией двенадцативодного гидрата тринатрийфосфата в присутствии кондиционирующей добавки - ортофосфатов щелочноземельных металлов с удельной поверхностью 0, 5 - 2,0 м2/г, количество которых отвечает 0,0005 - 0,0025 моля оксидов соответствующих металлов на 100 мас.ч. осадка, и отделении последнего от маточного раствора. При этом в случае переработки экстракционной фосфорной кислоты заданное количество и качество ортофосфатов щелочноземельных металлов обеспечивают, например, за счет нейтрализации кислоты кальцинированной содой до мольного отношения Na2O : P2O5, равного 5 : 3, и последующего отделения примесных компонентов ...

Способ получения двойного ортофосфата лития и переходного металла

Изобретение относится к литий-ионным аккумуляторам и может быть использовано для получения катодного электродного материала для литий-ионных батарей, используемых в качестве накопителей энергии для портативных электронных устройств, альтернативной энергетики, двигателей автомобилей, силовых машин. Предложен способ получения двойного ортофосфата лития и переходного металла, включающий приготовление прекурсора фосфата переходного металла в виде аммоний фосфата кобальта или никеля, либо гидрофосфата кобальта CoHPO4⋅2H2O или гидрофосфата никеля NiHPO4⋅2H2O в реакционной среде с использованием расплава нитрата лития с добавлением углерода технического в виде ацетиленовой сажи или моногидрата лимонной кислоты в количестве 1-10 мас. % от массы прекурсора для создания внешнего проводящего слоя получаемого нанокомпозита. Способ позволяет снизить энергоемкость процесса и длительность за счет снижения длительности синтеза и сушки и обеспечивает получение монодисперсного нанокомпозита узкого гранулометрического ...

СПОСОБ ПОЛУЧЕНИЯ ТРИНАТРИЙФОСФАТА

... 1. Способ получения тринатрийфосфата, включающий нейтрализацию фосфорной кислоты кальцинированной и каустической содой, отделение примесных компонентов, охлаждение раствора с кристаллизацией двенадцативодного гидрата, его отделение от маточного раствора, отличающийся тем, что кристаллизацию соли проводят в присутствии добавки смеси триполифосфата и пирофосфата натрия при их соотношении в смеси 0,5 - 4:1, взятой в количестве 0,002 - 0,01 мас.ч. на 1 мас.ч. готового продукта. 2. Способ по п.1, отличающийся тем, что указанную смесь конденсированных фосфатов вводят в раствор моно- и динатрийфосфата, получаемый после нейтрализации фосфорной кислоты содой. 3. Способ по п.1, отличающийся тем, что указанную смесь конденсированных фосфатов вводят в нейтрализованный содой и щелочью раствор тринатрийфосфата перед его охлаждением.

Получение двух солей щелочных металлов посредством комбинированного способа ионного обмена и кристаллизации

Способ получения ортофосфатов натрия

Способ получения хлорированного тринатрийфосфата

Способ получения дигидрофосфата калия

Изобретение относитс  к способу получени  дигидрофосфата кали , который используют в качестве удобрени , химического реактива и в электротехнике . Целью изобретени   вл етс  упрощение процесса. Дигидррфос- фат кали  получают обработкой 50-55%- ной ортофосфорной кислоты твердым ацетатом кали  при мол рном соотношении ацетата кали  и фосфорной кислоты , равном (1--1,09):1, в течение 10-15 мин с последующим отделением осадка продукта О Т маточника и его сушкой. Получают дигидрофосфат кали  с содержанием основного вещества 99,7-.00% и выходом 77-90,4%. 1 табл This invention relates to a process for producing potassium dihydrogen phosphate, which is used as a fertilizer, chemical reagent and in electrical engineering. The aim of the invention is to simplify the process. Potassium dihydrphosphate is obtained by treatment of 50-55% orthophosphoric acid with solid potassium acetate at a molar ratio of potassium acetate and phosphoric acid equal to (1--1.09): 1 for 10-15 minutes, followed by separation of the product precipitate About T the mother liquor and its drying. Potassium dihydrogen phosphate is obtained with a basic substance content of 99.7-.00% and a yield of 77-90.4%. 1 tab

Способ получения метафосфатов щелочных и щелочноземельных металлов

Способ получения дигидроортофосфатов щелочных металлов

Способ получения динатрий-фосфата

Способ предотвращения слеживаемостидВЕНАдцАТиВОдНОгО ТРиНАТРийфОСфАТА

Mittel zur Bekaempfung von Nagetieren

VERFAHREN ZUM CHEMISCHEN AUSLAUGEN VON PHOSPHAT AUS PHOSPHATMINERALIEN ENTHALTENDEM MATERIAL

Verfahren zur Herstellung kolloidaler Suspensionen von Phosphaten

Verfahren zur Herstellung von Dinatriumphosphat

VERFAHREN ZUR HERSTELLUNG VON PHOSPHORSAEURE

Verfahren zur Herstellung von Phosphaten aus Metalloxyden und Metallsalzen

Verfahren zur Herstellung von Salzen des 6-wertigen Chroms

PROCESS FOR MANUFACTURING SODIUM PHOSPHATES

... 1284507 Sodium phosphates SOC ITALIANA RESINE SpA 22 Dec 1970 [23 Dec 1969] 60970/70 Heading C1A In the continuous production of a mixture of mono- and disodium phosphates for tripolyphosphate manufacture, the desired Na 2 O/P 2 O 5 ratio is maintained by regulating the quantities of phosphoric acid and aqueous sodium hydroxide fed to an agitated reactor in accordance with the analysis of samples taken from the reaction mixture. The samples are titrated with sufficient standard NaOH to convert the phosphoric acid completely to disodium salt, and are then titrated with sufficient aqueous mineral acid to effect complete conversion to monosodium salt. In practice, the sample is diluted with de-ionized water and is titrated by base and acid to pH 8 and 4 respectively. The relative amounts of NaOH and H 3 PO 4 fed to the reactor, which amounts are such that the theoretical degree of acid neutralization lies between the mono- and disodium salts, is a function of the volumes of acid and base used ...

PROCESS FOR PREPARING ORTHO AND POLYPHOSPHATED COMPOSITION

... 1431314 Preparation of ortho and polyphosphated compositions S A CROS 19 July 1973 [24 July 1872] 34515/73 Heading C1A A process for preparing polymerizable monopotassium phosphate compositions comprises reacting phosphonite at 60-90‹ C. for at least 1 hour with an excess of 98% sulphuric acid and potassium sulphate in proportions corresponding to the equation 2Ca 3 (PO 4 ) 2 +5H 2 SO 4 + K 2 SO 4 #2H 3 PO 4 +2KH 2 PO 4 +6CaSO 4 in the presence of recycled wash waterderived from washing of filter cakes of the separated precipitates from above reaction, the reaction being carried out so that the composition of the aqueous phase is maintained at 16-22% of solubilized total P 2 O 5 , about 50% of which is present as free H 2 PO 4 . In a preferred second stage all the P 2 O 5 extracted in the first stage is converted into monopotassium orthophosphate of high purity by means of treatment of the above mother liquors with lime or phosphorite and K 2 SO 4 in the proportions equivalent to the following ...

SEPARATION BY ELECTROLYSIS

... 1,205,023. Electrolytically purifying solutions; mercury cathode cells. ALBRIGHT & WILSON (MFG) Ltd. Dec.18, 1967 [Dec.19, 1966], No. 56641/66. Heading C7B. A cation impurity having a deposition voltage less than the evolution voltage of hydrogen is separated from an aqueous solution of the cation impurity in admixture with a major proportion of another or other cations all having deposition voltages greater than the evolution voltage of hydrogen by electrolyzing the solution under conditions such that sufficient hydrogen is evolved at the cathode to carry the cation impurity, when deposited on the cathode, to the surface of the electrolyte and the other cations substantially remain in solution. By the process Fe or V cations can be removed from solutions containing alkali metal cations and Cu can be removed from Mg cations. The difference in deposition voltage between the impurity cation and other cation(s) must be at least 0À2 volt. All voltages are those obtained under the conditions ...

PROCESS FOR PRODUCING ALKALI METAL PHOSPHATE SOLUTIONS

... 1311377 Alkali metal phosphate KNAPSACK AG 16 July 1971 [17 July 1970] 33478/71 Heading C1A Alkali metal phosphate solution is obtained by: (1) mixing crude wet process H 3 PO 4 with alkali metal hydroxide or carbonate such that the mixture has a pH of 4-9, and separating a first sludge from the alkali metal phosphate solution; (2) mixing the sludge with (a) a mixture of alkali metal hydroxide solution and alkali metal phosphate solution, and (b) a mixture of water glass and alkali metal phosphate solution, to give a mash containing SiO 2 and Al 2 O 3 in a molar ratio of at least 2 : 1 and dissolved alkali metal oxide and P 2 O 5 in a molar ratio of 2À9 : 1 to 3À3 : 1; (3) heating the mash at 80-100‹ C. to form a solid residue which is discarded, and a solution; (4) cooling the solution to crystallize out an alkali metal phosphatefluoride double salt and separating the salt from the mother liquor which is preferably recycled as alkali metal phosphate to step 2; (5) mixing the salt with ...

PROCESS FOR OBTAINING ACIDS & SALTS IN DISSOLUTION BY ION EXCHANGE RESINS

PROCESS FOR PREPARING CHLORINE AND ALKALI PHOSPHATE SOLUTION BY ELECTROLYSIS AND ELECTROLYTIC CELL FOR CARRYING OUT THE PROCESS

... 1313441 Electrolytic production of chlorine and alkali metal phosphate PROGIL 5 May 1971 [15 May 1970] 13194/71 Heading C7B Chlorine, hydrogen and an aqueous solution of alkali metal phosphate are prepared electrolytically in a cell divided by a cationic selectively permeable membrane and having a porous anode of which only the surface(s) not facing the membrane are electro-chemically active, in which alkali metal chloride solution is continuously introduced into the anode compartment from which chlorine and alkali metal chloride solution are continuously withdrawn; and phosphoric acid or alkali metal phosphate solution is continuously introduced into the cathode compartment from which hydrogen and alkali metal phosphate solution (containing a higher alkali metal to phosphate ratio than the solution introduced into the compartment) are continuously withdrawn. The membrane may be a perfluorinated polymer, e.g. a sulphonated polytetra-fluoroethylene. The perforated anode may be of Ti, Ta, ...

Process for the manufacture of mono-alkali metal phosphates

Mono-alkali metal- or mono-ammonium-phosphates may be prepared by heating, to not above 180 DEG C., H3PO4 with an alkali metal- or ammonium-chloride in a molar ratio of 2:1 respectively, in the presence of vapours of an inert organic solvent having a boiling point at the pressure of the reaction above that of the azeotrope of HCl and H2O at that pressure, and withdrawing a mixture of solvent vapour and HCl from the reaction mixture. The solvent which may be kerosene, white spirit, n-octane, di-n-butyl-, di-sec-butyl-, or di-iso-amyl-ether, or tetrachloroethylene, may be added to the reaction mixture as a liquid, sufficient for the entire reaction or in small quantities throughout the reaction, and evaporated by external heat, or it may be heated separately and contacted as the vapour, in which case the process may be continuous. After removal of the solvent, the crystalline reaction mixture, which in the case of Na or K comprises NaH2PO4.H3PO4 or KH2PO4.H3PO4, can be decomposed by extractive ...

Improvements in the manufacture of alkali metal phosphates

Alkali metal phosphates (e.g. sodium phosphate) are produced from wet process phosphoric acid by neutralizing the acid in a known manner, filtering the neutralized liquor, maintaining the filtrate at least at 60 DEG C. for at least 2 hours to precipitate residual Ca, Mg and Fe, filtering a second time, and evaporating the filtrate to obtain a dry solid product. The filtrate from the second filtration may be evaporated to concentrate it and filtered again before being evaporated to dryness. After the first filtration, chlorine or an alkali metal hypochlorite may be added to the neutralized acid before it is evaporated to dryness. Nitric acid or a metal nitrate may be added to the liquor before or after the first filtration. The amount of chlorine or hypochlorite added is preferably such that the redox potential of the liquor is at least 500 m.v. measured using a Pt electrode and a calomel reference electrode, or alternatively the liquor may contain about 1% by weight of chlorine or hypochlorite ...

Improvements in and relating to the manufacture of alkali phosphates

Tri-alkali phosphates, especially tri-sodium phosphate, are made by heating together crude calcium phosphate and alkali hydroxide or carbonate so that CO2 is excluded or if evolved, is removed as quickly as possible, and extracting the final product. The crude phosphate may be previously purified by treating with HCl gas and chlorine at an elevated temperature thus vaporizing impurities; or by ignition with a small quantity of caustic soda in the presence of an oxidizing agent and leaching. Sufficient alkali is used to convert the phosphate to the trialkali compound and also to react with any impurities. The alkali may be added as a concentrated solution to form a paste which is dried or may be mixed in the form of a powder. The mixture is heated in an externally heated furnace or in an electric furnace, to about 4-500 DEG C. if a caustic alkali, or 8-900 DEG C. if the carbonate is used; in the latter case steam or other inert gas is led through the furnace to remove CO2. The product is ...

PROCESS FOR THE PREPARATION OF ALKALI METAL PHOSPHATE SOLUTIONS HAVING A REDUCED MANGANESE CONTENT

... 1,268,124. Purifying phosphoric acids or phosphates. KNAPSACK A.G. 21 Nov., 1969 [30 Nov., 1968], No. 57147/69. Heading C1A. Manganese is removed from phosphoric acids or acid alkali metal phosphate solutions, containing between 100 and 1000 p.p.m. by wt. manganese, based on P 2 O 5 , by establishing in the solution a concentration of magnesium, calcium or iron (II) cations of more than 2000 p.p.m. by wt., based on P 2 O 5 , neutralizing the acid solution with an alkali metal base, so as to establish an alkali metal oxide to P 2 O 5 molar ratio of more than 1À9, and filtering off the resulting precipitate to leave an alkali metal phosphate solution. The cations may be added in the form of MgSO 4 , CaCl 2 or FeSO 4 . Trivalent iron cations present in the solution may be reduced to the bivalent cation, by, for instance, hydrogen sulphide, or compounds yielding hydrogen sulphide such as sodium or barium sulphide.

Improvements in or relating to transceivers

... 812,082. Combined transmitting and receiving systems. TOKYO SHIBAURA ELECTRIC CO. Ltd. Sept. 14, 1955, No. 26253/55. Class 40 (5). [Also in Group XL (b)] A travelling wave tube is included in the receiver arm 25 of a radar or like transmitterreceiver having a common duplexer (wave guide 18) and antenna so that received signals are amplified by the tube but transmitted pulses, by overloading it, are attenuated. Moreover, received signals are rotated through 45 degrees by a 45 degree twist coupler 21 transforming the waveguide from rectangular to circular and further rotated through 45 degrees by a Faraday rotator 24 so that, being parallel to a conductor plane 26 in the waveguide, they are reflected back to and are accepted by the receiver arm 25, but transmitted signals, being not affected by the plane 26, are substantially rejected by the branch arm 25. The rotations due to the rotator 24 and twist coupler 21 on the transmitter signal, however, both cancel out. An inclined conducting plane ...

Improvements in or relating to a process for the preparation of water-soluble sulfates, phosphates or nitrates

A metal (including ammonium) chloride is reacted with sulphuric, phosphoric or nitric acid or with an acid sulphate or phosphate in an aqueous medium, the resultant hydrochloric acid is extracted with an organic solvent therefor which has limited miscibility with water and does not dissolve the salts present, the solvent phase is separated from the aqueous phase and the sulphate, phosphate, or nitrate contained in the latter is recovered in solid form. Suitable solvents are monohydric alcohols having four or more carbon atoms (e.g. butanols and pentanols), ethers (e.g. diethyl and di-isopropyl ether) and ketones (e.g. methyl ethyl ketone). Examples describe the preparation of potassium sulphate, sodium sulphate, potassium nitrate, disodium hydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate and other salts referred to are magnesium sulphate, zinc sulphate, ferrous sulphate, ferric sulphate and ammonium sulphate, phosphate and nitrate. The extraction may be carried ...

SOURCE OF PHOSPHATE FOR AGRICULTURE AND THE FOOD INDUSTRY

SOURCE OF PHOSPHATE FOR AGRICULTURE AND THE FOOD INDUSTRY

SOURCE OF PHOSPHATE FOR AGRICULTURE AND THE FOOD INDUSTRY

Soluble phosphate extraction starting from phosphates of iron and aluminium of natural origin, using solutions of hydroxides and alkaline metal carbonates.

Alkaline treatment of phosphates of calcium, aluminium and iron of natural origin.

Production of phosphates starting from phosphate ore treated by alkaline.

VERFAHREN ZUR HERSTELLUNG VANADIUMARMER ALKALIPHOSPHATLOESUNGEN

CLEANING TABLET FOR AUTOMATIC CLEANING FROM ARTIFICIAL DENTURES TO MANUFACTURING A WAESSRIGEN SOLUTION AS WELL AS PROCEDURE FOR YOUR PRODUCTION

PROCEDURE FOR THE PRODUCTION OF VANADIUM-POOR ALKALI PHOSPHATE SOLUTIONS

NATRIUM-ORTHOPHOSPHAT AND PROCEDURE FOR ITS PRODUCTION.

Zusammensetung for fog dispersal

PROCEDURE FOR THE PRODUCTION OF HIGHLY PURE POTASSIUM SALTS

Procedure for the production from salts, in particular alkali mono phosphates and device to the execution of the procedure

Procedure for registering an inorganic carbonate in powder form into an acid liquid

PHOSPHORUS COMPOUNDS

Source of phosphate for agriculture and the food industry

The invention concerns a phosphate salt in solid form of formula M ...

Process for recovering lithium values

A process for recovering lithium phosphate and lithium sulfate from a lithium-bearing solution, such as a brine or pregnant process liquor is described. The process includes adding phosphate to the lithium-bearing solution to precipitate lithium phosphate and then separating the resulting lithium phosphate precipitate from the solution. The separated lithium phosphate precipitate is then digested in sulphuric acid to produce a digestion mixture from which a lithium sulfate precipitate is separated. An alkali metal hydroxide is added to the separated solution to produce an alkali metal phosphate solution and this is recycled for use as phosphate in the first step of the process.

PROCESS FOR REDUCING IRON AND VANADIUM IN PHOSPHORIC ACID SOLUTION

PRODUCTION ELECTROLYTIQUE DE CHLORE ET DE PHOSPHATE ALCALIN EN SOLUTION CONCENTREE

LITHIUM IRON PHOSPHATE HAVING OLIVINE STRUCTURE AND METHOD FOR ANALYZING THE SAME

The present invention relates to a lithium iron phosphate having an olivine crystal structure, and more particularly, to an olivine lithium iron phosphate which has compositions of chemical formula (1) Li1+a Fe1-x Mx(PO4-b) Xb (where M, X, a, x, and b are as defined in the specification), contains 0.1~5 wt % of Li3PO4, and contains no or less than 0.25 wt % of Li2CO3. The lithium iron phosphate according to the present invention contains no lithium carbonate or an extremely small amount of lithium carbonate, and contains Li3PO4 which is very electrochemically stable and excellent in thermal safety and ionic conductivity. Thus, the lithium iron phosphate of the present invention shows superior stability during high temperature and storage conditions, and improved safety and rate capability when used as positive electrode active material for a lithium secondary battery.

PROCESS FOR DEARSENIFYING PHOSPHORIC ACID SOLUTIONS

PROCESS FOR DEARSENIFYING PHOSPHORIC ACID SOLUTIONS Phosphoric acid solutions are dearsenified by treating them with a sulfide and separating the resulting precipitate from the purified solution. The sulfide is at least one compound of the general formula P4Sx in which x stands for a number of 3 to 10.

LIQUID BUFFER SYSTEM

Monosodium phosphate is highly soluble in water and can be used as an ingredient for a low pH liquid buffer in a concentration of about 13-40 percent by weight. Tri potassium phosphate has good solubility in water and is a suitable ingredient for a high pH liquid buffer in a concentration of about 20-50 percent by weight. By a combination of these two ingredients, a system has been developed for using liquid buffer mixes in place of solid phosphate buffers.

PROCESS FOR PREPARING ALKALI METAL PHOSPHATES

PRODUCTION OF ALKALI METAL PHOSPHATE SOLUTIONS OF LOW VANADIUM CONTENT

PRODUCTION OF ALKALI METAL PHOSPHATE; SOLUTIONS OF LOW VANADIUM CONTENT. Alkali metal phosphate solutions of low vanadium content are produced from wet-processed phosphoric acids contaminated with vanadium and iron. The acids containing vanadium and iron in the highest stage of oxidation are treated with a reductant to effect conversion of the vanadium and iron contaminants to a lower stage of oxidation, the resulting acids are neutralized by means of an alkaline liquor and/or alkali metal carbonate down to a pH of at least 3, and the resulting precipitate is separated. The reductant used is the sodium salt of hydroxymethanesulfinic acid.

METHOD FOR PREPARING ALKALI METAL ORTHOPHOSPHATES AND AMMONIA IN A SINGLE STEP

ABSTRACT A selected ammonium phosphate is reacted at elevated temperature and pressure with sodium hydroxide in a vertical column having vapor-liquid contact means to produce an alkali metal orthophosphate having a low alkali metal/P molar ratio which is substantially free of ammonia. Ammonia is taken overhead.

MOISTURIZED COMPOSITIONS OF HYDRATE-FORMING PHOSPHATES AND METHODS FOR PREPARATION THEREOF

... 43-21(6924)A MOISTURIZED COMPOSITIONS OF HYDRATE-FORMING PHOSPHATES AND METHODS FOR PREPARATION THEREOF A composition of matter in particulate, crystalline form. The composition comprises a hydrate-forming phosphate selected from the group consisting of sodium tripolyphosphate, sodium pyrophosphate and trisodium phosphate, between about 0.1% by weight and about 23% by weight added water in the form of water of hydration said water ocntaining in solution sufficient surfactant to provide the composition from about 0.20 ppm and about 125 ppm of a surfactant. Methods for preparing such compositions are also disclosed.

PROCESS FOR MAKING AQUEOUS ALKALI METAL PHOSPHATE SOLUTIONS

CRYSTALLINE ION-CONDUCTING NANOMATERIAL AND METHOD FOR THE PRODUCTION THEREOF

... ²²²The invention relates to a crystalline ion-conducting material made of LiMPO4 ²nanoparticles, wherein M is selected from Cr, Mn, Co, Fe and Ni, in addition ²to mixtures thereof and the nanoparticles have an essentially flat prismatic ²shape. The invention also relates to a method for producing said type of ²crystalline ion-conducting material which consists of the following steps: a ²precursor component is produced in a solution from a lithium compound of a ²component containing metal ions M and a phosphate compound, the precursor ²compound is subsequently precipitated from the solution and, optionally, a ²suspension of the precursor compound is formed, the precursor compound and/or ²the suspension is dispersed and/or ground, and the precursor compound and/or ²the suspension is converted under hydrothermal conditions and subsequently, ²the crystalline material is extracted.² ...

PROCESS FOR RECOVERING LITHIUM PHOSPHATE AND LITHIUM SULFATE FROM LITHIUM-BEARING SILICATES

A process for recovering lithium phosphate and lithium sulfate from a lithium-bearing silicate is described. The process includes adding from 800 kg/t to 1600 kg/t of sulfuric acid to a slurry of the lithium-bearing silicate and from 40 kg/t to 600 kg/t of a source of fluoride to produce a leach mixture and heating said leach mixture. A lithium-bearing solution is then separated from the leach mixture and its pH is increased sequentially to pH 3.5 to 4, pH 5.5 to 6 then pH 10.5 to 11 to precipitate, respectively, a first, second and third set of impurities therefrom. The first, second and third sets of impurities are separated from the lithium-bearing solution and lime is added to maintain a soluble Ca concentration of at least 30 mg/L. The lithium-bearing solution is then softened by adding a two sequential amounts of phosphate to precipitate fluorapatite and apatite, respectively. A third amount of phosphate is added to produce a lithium phosphate precipitate which is then separated.

PROCESS FOR REMOVING MANGANESE FROM PHOSPHORIC ACIDS OR ACID ALKALI METAL PHOSPHATE SOLUTIONS

PRODUCTION OF PHOSPHATES FROM ALKALI-PROCESSED PHOSPHATE ROCK

SYNTHESIS OF METAL COMPOUNDS USEFUL AS CATHODE ACTIVE MATERIALS

Active materials of the invention contain at least one alkali metal and at least one other metal capable of being oxidized to a higher oxidation state. Preferred other metals are accordingly selected from the group consisting of transition metals (defined as Groups 4-11 of the periodic table), as well as certain other non-transition materials such as tin, bismuth, and lead. The active materials may be synthesized in single step reactions or in multi-step reactions. In at least one of the steps of the synthesis reaction, reducing carbon is used a s a starting material. In one aspect, the reducing carbon is provided by elemental carbon, preferably in particulate form such as graphites, amorphous carbon, carbon blacks and the like. In another aspect, reducing carbon may also be provided by an organic precursor material, or by a mixture of elemental carbon and organic precursor material.

FORMULATIONS OF CALCIUM AND PHOSPHATE FOR ORAL INFLAMMATION

The present invention generally relates to liquid compositions and methods for treating oral inflammation by administering a liquid composition to the oral cavity. The liquid composition is prepared from a powder containing calcium glycerophosphate, one or more sodium phosphate salts, sodium chloride, and optionally sodium bicarbonate and silica. The powder is mixed with a quality of water to form a liquid that is supersaturated with calcium ions and phosphate ions and is essentially free of visible particles and precipitate.

Procédé pour la fabrication du carbure de calcium à partir des phosphates de chaux.

Verfahren zur Gewinnung von Alkaliphosphaten.

Verfahren zur Herstellung eines Reinigungs- und Wasserenthärtungsmittels.

Procédé pour la désulfatation des bains de coagulation pour la filature de viscose.

Verfahren zur kontinuierlichen Gewinnung kristallisierter Stoffe

Verfahren zur Herstellung von wasserlöslichen Sulfaten, Phosphaten oder Nitraten

Verfahren zur Herstellung von handelsüblich reinen Alkali-Phosphaten.

Procédé de préparation de sels métalliques d'acides dont la constante de dissociation est supérieure à 10-6

Verfahren zur Herstellung von Phosphaten

Schaltungsanordnung für eine durch jeweils einen von mehreren Markierern zentral gesteuerte Fernmelde-, insbesondere Fernsprechanlage, in der im Falle eines Fehlers das störende, dezentrale Gerät lokalisiert und abgeschaltet wird

Verfahren zur Herstellung von Alkali- und/oder Erdalkaliphosphaten

Verfahren zur gleichzeitigen Herstellung von anorganischen Alkalimetallsalzen und Chlorgas

Procedimento per la preparazione di un prodotto di salificazione parziale dell'acido fosforico costituito essenzialmente dai sali mono- e di-sodico

Verfahren zur Herstellung von Alkalidi- und -triphosphaten

Agglomeriertes Material und Verfahren zu dessen Herstellung

PRAEPARAT ZUR NEBELAUFLOESUNG.

Procédé de préparation d'un phosphate trisodique hydraté

Verfahren und Vorrichtung zur Herstellung von Alkali- und/oder Erdalkaliphosphaten

Verfahren zur Gewinnung von Alkalimonophosphaten

Verfahren zur Herstellung von Alkalimonophosphaten

Verfahren zur Abtrennung von Mangan aus Phosphorsäuren oder sauren Alkaliphosphatlösungen

Tablet for the automatic cleaning of dentures in aqueous solution

METHOD OF REMOVING WATER FROM WET INTUMESCENT MATERIAL MASS, MASS THUS FORMED AND ITS USE IN A FIRE PANEL.

PLANT FOR COMBINED PRODUCTION OF PHOSPHATE SALTS AND POTASSIUM SULFATE

СПОСОБ ПОЛУЧЕНИЯ ФОСФАТОВ НАТРИЯ

Изобретение относится к области получения фосфатов натрия, например триполифосфата натрия, используемых в производстве моющих синтетических средств, пищевых добавок, в теплоэнергетике и нефтяной промышленности. Задачей настоящего изобретения является разработка способа получения фосфатов натрия, например триполифосфата натрия, впервые из низкосортного фосфатного сырья. Технический результат - высокая производительность процесса и высокий выход фосфора в готовый продукт за счет увеличения скорости фильтрации на двухстадийной нейтрализации суспензии и, как следствие, значительное улучшение технико-экономических показателей. Заявляемый технический результат достигается за счет того, что обработку суспензии, полученной из низкосортного фосфатного сырья, ведут частью того же сырья до концентрации CaO=0,8-1,7% и SO4=0,7-0,4%; обработку фильтрата натрийсодержащим раствором ведут до мольного отношения Na2O:P2O5=0,6-0,75, используя в качестве натрийсодержащего раствора раствор соды или фильтрат ...

СПОСОБ ПОЛУЧЕНИЯ ОДНОЗАМЕЩЕННЫХ ФОСФАТОВ ЩЕЛОЧНЫХ МЕТАЛЛОВ

Способ получения однозамещенных фосфатов щелочных металлов, в том числе дейтерированных, предусматривает взаимодействие ортофосфорной кислоты с соответствующим щелочным реагентом, кристаллизацию, отделение кристаллов и сушку полученного продукта. В качестве щелочного реагента используется бикарбонат соответствующего щелочного металла. Изобретение относится к технологии получения фосфорнокислых солей щелочных металлов и может быть использованным в химической промышленности для получения однозамещенных фосфатов щелочных металлов, а также в производстве сырья для оптических кристаллов фосфатной группы.

Method for producing food-grade disodium hydrogen phosphate by using wet-process dilute phosphoric acid

Production method for preparing potassium dihydrogen phosphate and by-producing special fertilizer for gingko seedlings

The invention relates to the technical field of chemical industry, and particularly relates to a production method for preparing potassium dihydrogen phosphate and by-producing a special fertilizer for gingko seedlings. According to the production method, the purity of a potassium dihydrogen phosphate product is enhanced by changing the coefficients, namely temperature and the like, of preparing potassium dihydrogen phosphate from wet-process phosphoric acid, a compounded-form compound fertilizer which contains N, P and K can be produced, and a controlled-release compound fertilizer is prepared by adding formaldehyde to filter liquor. The production method disclosed by the invention can enhance the purity of potassium dihydrogen phosphate, and the produced special fertilizer for the gingko seedlings has good absorptivity; in addition, the produced special fertilizer for the gingko seedlings can meet the requirements for nutrition in all stages of the growth cycle of the gingko seedlings ...

Method for recovering iodine from industrial byproduct containing KI

A method for recovering iodine from an industrial byproduct containing KI relates to a recovery method of iodine. The method comprises the following steps: preparing a raw material into a raw material liquid; conveying the raw material liquid to the inside of a monopotassium phosphate crystallization kettle; obtaining a feed level monopotassium phosphate byproduct by controlling proper conditions; conveying a reaction solution from the kettle to the inside of an iodine crystallization kettle; and at lower temperature, finally obtaining a medical level iodine product by adding proper crystallization improvement agent and composite oxidant. According to the method disclosed by the invention, reaction conditions are mild, the requirement on the material of the equipment is not high, the medical level iodine quality of the obtained main product completely meets national stand and the recovery rate is higher.

A PROCESS FOR THE PREPARATION OF POTASSIC FERTILISER FROM ALCOHOL DISTILLERY EFFLUENT (SPENT WASH)

The present invention provides a method for the preparation of multi-nutrient potassic fertilizer, by recovering potassium from sugarcane molasses based alcohol distillery effluent (commonly known as ‘spent wash’). The process involves pre-treatment of spent wash to clarify the aqueous phase and utilization of the treated spent wash in production of potassic fertilizer. The present invention enables utilisation of spent wash for recovery of value-added product (viz., potash fertiliser of >99% purity) and improves ease of ‘Zero Liquid Discharge’ compliance by subjecting the relatively benign process effluent to industrially practiced techniques for water recovery and salt reclamation. 1. A process for the preparation of multi-nutrient potassic fertiliser , more specifically mono potassium phosphate , by recovering potassium from spent wash , wherein the said process comprising the following steps:(i) lime treatment of spent wash to generate carbon-rich sludge having pH greater than 12.0;(ii) reacting the supernatant/filtrate obtained from step (i) with carbon dioxide till the pH is in the range of 8.0 to 9.0 to reduce calcium content in the solution;(iii) reacting the supernatant/filtrate obtained from step (ii) with sulphuric acid to achieve a pH of less than 2.5 so as to minimise calcium content in solution;(iv) reacting the supernatant/filtrate obtained from step (iii) with tartaric acid and sodium hydroxide to effect precipitation of potassium bitartrate while maintaining the pH in the range of 2.5 to 3.1;(v) treating the supernatant/filtrate obtained from step (iv) with calcium oxide/carbonate till the pH comes in the range of 5.0 to 6.0 to recover residual tartrate as calcium tartrate;(vi) discharging the supernatant/effluent obtained from step (v) as process effluent for subsequent environmental remediation/water recovery/salt reclamation;(vii) reacting the potassium bitartrate obtained from step (iv) with calcium oxide/hydroxide/carbonate and phosphoric acid ...

PROCESS FOR RECOVERING LITHIUM VALUES

A process for recovering lithium phosphate and lithium sulfate from a lithium-bearing solution, such as a brine or pregnant process liquor is described. The process includes adding phosphate to the lithium-bearing solution to precipitate lithium phosphate and then separating the resulting lithium phosphate precipitate from the solution. The separated lithium phosphate precipitate is then digested in sulphuric acid to produce a digestion mixture from which a lithium sulfate precipitate is separated. An alkali metal hydroxide is added to the separated solution to produce an alkali metal phosphate solution and this is recycled for use as phosphate in the first step of the process. 1. A process for recovering lithium phosphate from a lithium-bearing solution comprising:a) adding phosphate to the lithium-bearing solution to produce a lithium phosphate precipitate;b) separating the lithium phosphate precipitate from a solution produced in step a);b1) dissolving the separated lithium phosphate precipitate in a solution comprising phosphoric acid at a pH of about pH 4 to about pH 6 to re-precipitate the lithium phosphate;b2) separating the re-precipitated lithium phosphate from the phosphoric acid solution.2. The process according to claim 1 , further comprising:c) digesting the separated re-precipitated lithium phosphate precipitate in sulfuric acid to produce a digestion mixture and precipitate lithium sulfate therefrom, and separating the lithium sulfate precipitate from the digestion mixture to recover lithium sulfate.3. The process according to claim 1 , further comprising:d) adding alkali metal hydroxide to the separated phosphoric acid solution from step b2) or the separated digestion mixture from step c) to produce an alkali metal phosphate solution and recycling the alkali metal phosphate solution to step a) for use as the phosphate.4. The process according to claim 1 , wherein phosphate is added to the lithium-bearing solution in step a) in stoichiometric excess ...

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溶剂萃取法净化湿法磷酸联产磷酸二氢钾的方法

本发明提供了一种溶剂萃取法净化湿法磷酸联产磷酸二氢钾的方法，包括以下步骤：(1)、湿法磷酸经脱硫脱氟沉降过滤后再用复合有机溶剂萃取得到负载有机相的工艺；或湿法磷酸直接经过沉降后，采用复合有机溶剂进行萃取，然后负载磷酸的有机相中加入脱硫脱氟试剂进行脱硫脱氟得到负载有机相；(2)、负载有机相用湿法净化稀磷酸进行洗涤；(3)、洗涤后的负载有机相采用去离子水反萃(4)、反萃后的有机相采用氢氧化钾溶液洗涤，洗涤后的有机相返回作为萃取溶剂；(5)、洗涤液中加入净化稀磷酸，混合后过滤，除去固形有机杂质，再加入氢氧化钾调节pH,浓缩、结晶、干燥得到磷酸二氢钾。消除萃取剂的长周期运行带来的指标恶化、乳化夹带等现象。

湿法磷酸萃取生产磷酸二氢钾中萃取剂回收装置及其方法

本发明公开了一种湿法磷酸萃取生产磷酸二氢钾中萃取剂回收装置及其方法，涉及萃取法生产磷酸二氢钾技术领域。通过漂浮式回收装置将稠厚器表层的萃合物进行收集，通过潜水泵泵入萃合物收集槽内进行一次反萃后，在萃取剂回收槽静置分相后进行一次排放，向分相后的有机相再次加入反萃剂进行二次反萃，静置分相后进行二次排放，有机相进入板框压滤机内过滤后用于萃取法生产磷酸二氢钾。通过上述装置对萃合物进行反萃回收萃取剂，循环用于生产，减少萃取剂的消耗量，同时避免颗粒杂质随回收后的萃取剂进入萃取系统。采用二次反萃、二次排放，反萃效果更佳。

一种生产磷酸二氢钾的方法

本发明涉及一种生产磷酸二氢钾的方法，将饲料级磷酸氢钙先和工业级磷酸进行预分解反应，再加入硫酸氢钾进行复分解反应，过滤出硫酸钙和滤液，对滤液进行净化处理后浓缩冷却结晶，制备出磷酸二氢钾产品，结晶母液返回到饲料级磷酸氢钙中进行循环操作，或用于无氯复合肥的生产。与现有技术相比，本发明方法采取磷酸与饲料级磷酸氢钙进行预反应大幅度提高了饲料级磷酸氢钙中磷的回收率，达到95％以上，另外硫酸氢钾中钾的收率达到99.5％，同时，本发明中的磷酸实现了循环使用，无废液排放，本工艺流程简单，原料中的磷和钾收率高，可以大幅度地降低生产成本，环保可持续，具有极大的竞争优势。

Manufacturing method of high-concentration lithium solution from lithium phosphate

An embodiment of the present invention relates to a method of manufacturing a high-concentration lithium sulfate solution from lithium phosphate which comprises: (a) a step of mixing lithium phosphate obtained by adding phosphoric acid-containing materials in a lithium solution with sulfur-containing materials and performing a dry reaction; and (b) a step of dissolving a water-soluble sulfur-lithium compound produced by the dry reaction in a solvent. According to an aspect of the present invention, the method of manufacturing the high-concentration lithium sulfate solution from lithium phosphate can be directly applied to lithium extraction in a salt lake, waste water and bittern, and also is applicable to a lithium solution extracted from seawater, lithium ore and waste lithium electrode materials.

A kind of production method of potassium dihydrogen phosphate

本发明公开了一种用盐酸分解磷矿制备磷酸二氢钾的方法。该方法步骤为：第一步，用盐酸和硫酸铵分解磷矿；第二步，用脱氟剂对第一步中的滤液进行脱氟，得到氟硅酸盐和脱氟滤液；第三步，中和脱氟滤液，得到磷酸氢钙；第四步，用硫酸和硫酸氢钾的混合溶液和磷酸氢钙反应；第五步，用石灰浆中和第四步中的过滤液；第六步，对第五步中的过滤液浓缩、结晶、分离，得到成品；蒸发液部分返回系统用于磷酸氢钙分解。本发明过程清晰且易于控制，产品成本远小于现在用热法磷酸制取磷酸二氢钾的成本，且提高了副产盐酸、磷矿的利用效率，而且没有危害环境的产物，生产环境友好，有很好的经济效益和社会效益。

Method for extracting lithium

本发明涉及一种提取锂的方法，所述方法包括以下步骤：准备包含碱土金属的含锂溶液；控制所述含锂溶液中的碱土金属的活性；以及在所述含锂溶液中投入磷供应物质，以析出磷酸锂。

Phosphatic abraum salt recycling processing method

本发明公开了一种含磷酸盐的废盐资源化处理方法。所述方法首先将含磷酸盐的废盐于300℃～500℃热解后与水混合，在80℃～100℃加热条件下使磷酸盐充分溶解并加入活性炭搅拌，过滤得到含有少量氯化钠的磷酸盐溶液，调节盐溶液的pH值至4～12，然后将70℃～90℃的热磷酸盐溶液以15～30℃/h的降温速率冷却结晶析出磷酸盐固体，固液分离后回收滤液，得到磷酸盐。本发明以磷酸二氢钠、磷酸氢二钠和磷酸钠等形式回收磷酸盐，实现了废盐的资源化回收利用，回收的磷酸盐纯度高且晶粒度较好，避免了重结晶过程中降温过快导致结晶效果差的问题，同时，分离得到的活性炭和滤液都可以通过再生重复利用，保证了废水的零排放。

Method of extracting lithium

리튬 추출 방법에 대한 것으로, 알칼리 토금속을 포함하는 리튬 함유 용액을 준비하는 단계; 상기 리튬 함유 용액 내 알칼리 토금속의 활동도를 제어하는 단계; 및 상기 리튬 함유 용액에 인 공급 물질을 투입하여 인산 리튬을 석출시키는 단계;를 포함하는 리튬 추출 방법을 제공한다. A lithium extraction method comprising the steps of: preparing a lithium containing solution comprising an alkaline earth metal; Controlling the activity of alkaline earth metals in the lithium containing solution; And depositing lithium phosphate by adding a phosphorus supply material to the lithium-containing solution.

Manufacturing of sodium phosphate from mixed waste acid

본 발명은 액정 표시 소자 및 반도체 제조공정에서 발생하는 질산, 초산, 알루미늄을 불순물로 함유하는 혼합 인산폐액으로부터 일인산나트륨, 이인산나트륨 및 삼인산나트륨을 제조하는 방법에 관한 것으로, 액정 표시 소자 및 반도체 제조공정에서 발생되는 인산폐액중의 질산 및 초산을 BP(Boiling Point) 차이를 이용한 진공증발법으로 분리, 제거하고, 증발기 내부 반응기에 잔류한 알루미늄을 함유한 인산용액을 확산투석법으로 알루미늄을 분리, 제거하면 순수한 정제 인산용액을 제조하고, 상기 정제인산에 가성소다를 투입하여 일인산나트륨, 이인산나트륨 및 삼인산나트륨을 제조하는 방법에 관한 것이다. LCD 제조폐액, 일인산암모늄, 이인산나트륨, 삼인산나트륨, 진공증발, 확산투석

Method for producing monopotassium phosphate by fluoride salt purification process

本发明涉及用氟化盐净化法生产磷酸二氢钾的方法，以湿法磷酸为原料，加入磷矿粉进行脱硫，再加入磷酸二氢钾进行水浴反应脱氟；将脱氟过程中制得的氟硅酸钾加入氨水反应，制备氟化盐除杂剂；将脱硫脱氟磷酸用氨气中和后加入制得的氟化盐除杂剂，调节pH，反应后趁热过滤，得到的一铵溶液稀释并调节pH后，加入氯化钾，反应结束后滤液加入络合剂，溶解完全后，降温、析晶、过滤，制得磷酸二氢钾晶体。本发明采用多重净化步骤，尤其是在磷酸脱氟净化工艺中提取净化剂氟化盐并将之应用于磷酸二氢钾生产过程中的净化工艺，不仅充分利用脱氟副产物，同时提高了磷酸二氢钾产品的纯度，减少了其他杂质的引入，具有较好的社会和经济效益。

Extracting agent for producing potassium dihydrogen phosphate by solvent extraction method and preparation method and application thereof

本发明公开了一种适用于溶剂萃取法生产磷酸二氢钾的专用萃取剂及其制备方法和应用，所述萃取剂包括主萃取剂和稀释剂，其中，主萃取剂为含羰基的不对称叔胺。在采用溶剂萃取法生产磷酸二氢钾时，使用本发明的萃取剂，能够提高对盐酸的选择性，多萃取盐酸，少萃取磷酸；提高两相的分相性能，尽快分相，不出现乳化现象，不出现两相夹带，具有磷收率高、萃取剂损失小、产品质量好等特点。

A kind of method of double decomposition solution in purifying phosphoric acid potassium dihydrogen production process

本发明涉及一种净化磷酸二氢钾生产过程中复分解溶液的方法，饲料级磷酸氢钙先和工业级磷酸进行预分解反应，再加入硫酸氢钾进行复分解反应，复分解反应后进行第一次过滤，得到一级滤渣硫酸钙和一级滤液；一级滤液进行第一次浓缩，并冷却沉淀，然后进行第二次过滤，得到二级滤渣和二级滤液，二级滤渣返回到复分解反应体系中；二级滤液进行第二次浓缩，然后进行冷却结晶，再进行第三次过滤，得到磷酸二氢钾产品和结晶母液，结晶母液返回到预分解反应体系中，进行循环操作。与现有技术相比，本发明通过对滤液的分步浓缩，实现了不加入除杂试剂对滤液进行净化，另外净化滤液得到的杂质返回到复分解反应体系中，对磷和钾进行回收，避免了磷和钾的损失。

Preparation method of disodium hydrogen phosphate large particles by double-effect crystallization method

本发明公开了一种双效结晶法磷酸氢二钠大颗粒的制备方法，以双效结晶的方式对磷酸钠盐产品进行结晶，结合二次加酸加碱的重结晶工艺，生产出二水磷酸氢二钠大颗粒产品；一方面由于可以连续进料浓缩，从而保证结晶颗粒稳定，提高产品合格率，保证系统蒸汽平衡稳定，并且降低蒸汽消耗；另一方面，双效浓缩结晶工艺结合二次加酸加碱的重结晶工艺，使得细小的结晶颗粒继续成长为中粗颗粒，可生产出二水磷酸氢二钠大颗粒产品。

Manufacture of alkali metal salts via combined ion-exchange/crystallization method

FIELD: industrial inorganic synthesis. SUBSTANCE: invention relates to a method of manufacturing alkali metal nitrate and alkali metal phosphate from phosphate raw material and nitrate raw material in a single process comprising following stages: (i) interaction of phosphate raw material with nitrate raw material to form aqueous nitro-phosphate reaction mixture optionally followed by separation of solids; (ii) passing aqueous nitro-phosphate reaction mixture to the first ion-exchange phase, carried out in case when alkali metal ion-saturated ion-exchange resin is available to exchange cations present in reaction mixture by alkali metal ions of the resin to form stream enriched by alkali metal ions; (iii) performing first crystallization of the above reaction mixture under conditions favoring crystallization of alkali metal nitrate and separating the latter from liquor solution; (iv) passing the above liquor solution to the second phase of ion exchange carried out in case when alkali metal ion-saturated ion-exchange resin is available to exchange cations present in reaction mixture by alkali metal ions of the resin to form stream containing phosphate enriched by alkali metal ions; and (v) performing second crystallization of stream obtained in stage (iv) under conditions favoring crystallization of alkali metal phosphate and separating crystallized alkali metal phosphate from mother solution. EFFECT: enhanced process efficiency, minimized amount of wastes, and reduced power consumption. 15 cl, 1 dwg, 6 tbl, 4 ex э0о6зЗ$ сс ПЧ сэ РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МПК? ВИ “” 2 238 906. С 01 В 25/30, С 010 9/04, С 13) С2 05 В 11/06, С 050 1/00 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 2002118314/15, 01.12.2000 (24) Дата начала действия патента: 01.12.2000 (30) Приоритет: 03.12.1999 Е 19992606 (43) Дата публикации заявки: 21.01.2004 (45) Дата публикации: 27.10.2004 (56) Ссылки: Ц$ 3993466 А, 23.11.1972. ЗЦ ...

Method of preparing lithium compound

본 발명은 리튬 화합물의 제조 방법에 대한 것으로, 고상의 인산 리튬을 용매에 슬러리 상태로 준비하는 단계, 상기 인산 리튬과 황산을 반응시켜 상기 인산 리튬을 황산 리튬으로 전환하는 단계, 상기 황산 리튬을 고상으로 분리하는 단계, 상기 분리된 고상의 황산 리튬을 세척하는 단계, 및 상기 세척하는 단계에 사용된 세척수를, 상기 고상의 인산 리튬을 용매에 슬러리 상태로 준비하는 단계의 용매로 재사용하는 단계를 포함한다.

Patent FR2541309B1

Monopotassium orthophosphate prepn. - from potassium chloride and a calcium phosphate component

The prepn of KH2PO4 is carried out by reacting KCL in an aqs. medium with a cpd. or mixt of cpds of H3PO4 and CaO in which the CaO=P2O5 molar ratio is 0.7-1.1 (pref. 0.9- 1.0), at a temp low enough for pptn. (esp. -5 to +5 degrees C). The K:P molar ratio of the reactants is pref. 1.1-2.0 (esp. 1.25-1.50). The starting material can be hydrated monocalcium phosphate or a mixt. of H3PO4 and CaCO3, CaO, anhydrous dicalcium phosphate or di- and tricalcium phosphate. The KH2PO4 can be crystallised out of the reaction mixt. in high yield (e.g. 60-75% based on P2O5).

Process for the preparation of alkaline phosphate

Method and apparatus for the preparation of alkaline phosphates

Patent FR2041003A1

Process for the preparation of phosphorus compounds

Process for manufacturing alkaline phosphates and products obtained

Improvements in processes for the manufacture of alkaline orthophosphates

Process for extracting and upgrading phosphoric acid from natural tricalcium salts, in particular from bones

PROCESS FOR THE PREPARATION OF SOLUTIONS OF PURE ALKALINE PHOSPHATES FROM PHOSPHORIC ACIDS BY WET METHOD

Process of making substantially pure alkali metal and ammonium phosphates from crudephosphoric acid

Patent FR2220473B1

Process for treating a steelmaking slag containing oxidised compounds of sodium and of phosphorus

The slag 1 is dispersed in an aqueous solution 3 containing sodium phosphate and sodium monocarbonate and the resulting solution 10 is cooled to jointly crystallise sodium phosphate and sodium carbonate 14. The process is applied to the treatment of dephosphorisation (basic) and desulphurisation slags from smelting with sodium carbonate.

Improvement in manufacturing using inorganic carbonates

Process for obtaining alkaline orthophosphates

New detergent compositions and their preparation

Purification process by neutralization of phosphoric acid obtained by wet route

Patent FR2342249B1

Isomerization catalyst

Potash phosphate manufacturing process

Dry free-flowing detergent composition and method of preparation

Purification of phosphorus-containing solutions

A kind of preparation method and process units of thioacetic acid

本发明公开了一种硫代乙酸的制备方法及生产装置，采用醋酸、五硫化二磷在特定的催化剂的作用下低温反应，固液分离，液相经精馏分离后获得硫代乙酸。本发明进一步对第一次固液分离后得到的固相物质进行提取纯化，得到副产物磷酸钾。本发明采用价格低廉易得的原料及催化剂，在较低的温度和压强下，甚至是常温常压下即可反应合成硫代乙酸，再通过固液分离，得到的液相经精馏分离获得高纯度和高收率的硫代乙酸。本发明通过进一步对第一次固液分离后得到的固相物质进行提取纯化，从废液中获得高纯度和高收率的高附加值副产物磷酸钾，对环境友好，具有较高的经济性。

Production of trisodium phosphate and mixtures containing it

Process for the production of fine flaky goods containing salts containing water of crystallization

Method of producing commercial alkali phosphates

Anodic oxidation of ferrophosphorus

Process for the preparation of alkaline phosphates

Production of pure alkali metal phosphate solutions from wet-processed phosphoric acid

Production of pure alkali metal phosphate solutions by neutralizing wet-processed phosphoric acid with an alkali liquor and/or carbonate. To this end, the wet-processed phosphoric acid is neutralized to a pH from 4 to 9, the resulting neutralization sludge consisting substantially of insoluble aluminum and iron phosphates is separated from the alkali metal phosphate solution and scrubbed with water, the sludge so treated is mixed with alkali liquor, alkali metal phosphate solution and water-glass so as to establish in the resulting suspension a molar ratio of SiO2 to Al2O3 of at least 2 : 1 and a molar ratio of dissolved alkali metal oxide to dissolved P2O5 ranging from 2.9 : 1 to 3.3 : 1, the whole is heated to temperatures from 80 DEG to 100 DEG C to effect breakup of the sludge in the suspension with the resultant formation of a solid matter residue together with a trialkali metal phosphate solution, the solid matter residue is separated from the trialkali metal phosphate solution, water-scrubbed, and discarded. More particularly, crude wet-processed phosphoric acid containing more than 45 weight % of P2O5 is diluted with a portion of the scrubbing water obtained during operation and its P2O5-content is thereby reduced down to 30 to 45 weight %. The acid so treated is neutralized with an alkali liquor and/or carbonate and with the trialkali metal phosphate solution originating from the processed neutralization sludge.

Process of manufacturing monophosphates of alkali metals and alkaline

Continuous process for preparing sodium orthophosphate slurries from natural soda ash orthophosphoric acid

Unmilled commercially available granular "natural" soda ash is reacted with orthophosphoric acid to produce a highly concentrated slurry at a molar Na:P ratio of about 1.5 in a continuous process. Problems associated with incomplete reaction are solved and the slurry can be dried to the double salt Na 3 H 3 (PO 4 ) 2 or reacted with aqueous sodium hydroxide to produce a superior precursor for manufacturing sodium tripolyphosphate.

Process for obtaining alkaline orthophosphates

PROCESS FOR THE PREPARATION OF LOW-VANADIUM ALKALINE METAL PHOSPHATE SOLUTIONS.

Process for the production of alkali phosphates

Alkali phosphates and sulphates; iron oxide and sulphide; copper and zinc chlorides; hydrochloric acid; ferrophosphorus.--Alkali phosphates, especially trisodium phosphate, are obtained in a cyclic process, by heating ferrous sulphide with alkali chloride, oxygen and steam to form ferric oxide, hydrogen chloride and alkali sulphate; this latter is then heated with a metal-phosphorus alloy, especially ferrophosphorus, to produce the alkali phosphate and ferrous sulphide, which is reemployed in the first reaction. This first reaction may be carried out in combination with the chloridizing roasting of roasted zinciferous or cupriferous pyrites, ferrous sulphide being added in place of all or part of the usual addition of green pyrites. The ferric oxide may be converted into ferro-phosphorus by heating with coal and calcium or aluminium phosphate, the silicate slag obtained being suitable for conversion into cement.

Production of alkali phosphates from metal-phosphorus alloys

Process for the preparation of water-soluble potassium salts

Dehydration of diols using lithium phosphate catalyst

As a new dehydration catalyst for epoxides or diols, lithium phosphate having a ratio of the numbers of Li to P atoms between 2,2 and 3; a process for preparing the catalyst and its uses have also been disclosed.

Continuous production of crystalline sodium orthophosphate, used e.g. for water treatment or in pharmaceutical or food industry, has zone for mixing neutralized solution, saturated solution and crystal suspension at high Reynolds number

In continuous production of crystalline sodium orthophosphate (I) from phosphoric acid and aqueous sodium hydroxide or sodium carbonate solution, (I) solution from the neutralization zone is mixed with saturated (I) solution containing crystals and with (I) crystal suspension; and a flow rate of 0.5-2.0 m/second and Reynolds number of 3000-60000 are maintained in the mixing zone between the neutralization and separation zones. Continuous production of crystalline sodium orthophosphate (I) involves reacting phosphoric acid with aqueous sodium hydroxide or sodium carbonate solution in a neutralization zone to give a dilute (I) solution compared with the saturation concentration; forming a crystal suspension; separating this into a crystal product and mother liquor in a separation zone; and optionally recycling the mother liquor. The novelty is that, in a mixing zone between the neutralization and separation zones, the (I) solution (A) from the neutralization zone is mixed with saturated (I) solution (B) containing crystals and with (I) crystal suspension (C); and a flow rate of 0.5-2.0 m/second and Reynolds number of 3000-60000 are maintained in the mixing zone. An Independent claim is also included for the apparatus used in this process which includes a neutralization vessel, a separator and a pipe for recycling mother liquor from the separator. The apparatus further comprises a reaction tube, between the neutralization vessel and separator, which is connected to the neutralization vessel and has inlets for recycled mother liquor and (I) suspension.

Production of potassium phosphates by ion exchange

ABSTRACT OF THE DISCLOSURE A process for producing potassium phosphates by ion exchange using an Advanced Separation Device (ASD) is disclosed. The process is carried out by supplying a phosphate salt solution, a washing solution and a potassium salt regeneration solution to respec-tive fixed feed ports in periodic fluid communication with a plurality of resin-filled chambers moving about a circular path. Passage of the phosphate salt solu-tion through potassium loaded resin forms potassium phosphates and cation loaded resin by ion exchange. After washing out residual salts, the cation loaded resin is regenerated by adding a potassium salt which loads the resin with potassium and strips it of the cation in the form of a soluble cation salt. By virtue of the ASD, potassium phosphate may be produced continuously and with greater efficiency than is possible with conventional ion exchange processes since the potassium salt and phosphate salt feed solutions may be fortified in an intra-stage fashion, i.e. during the course of the ion exchange or regeneration stages. In similar fashion, the pH may be adjusted in an intra-stage fashion.

Method of producing potassium phosphate

A kind of preparation facilities and preparation method of high density anhydrous potassium dihydrogen phosphate

一种高密度无水磷酸氢二钾的制备装置，该装置包括第一喷雾干燥塔、第二喷雾干燥塔和用于盛装磷酸氢二钾浓缩液的浓缩罐，第一喷雾干燥塔内由上至下设有若干浓缩液喷雾器，第二喷雾干燥塔的上部或顶部设有浓缩液喷雾器，第一喷雾干燥塔与第二喷雾干燥塔内的浓缩液喷雾器均通过浓缩液输送管道与浓缩罐连接；所述第二喷雾干燥塔的底部设有出料口，出料口处连通有另一端伸入第一喷雾干燥塔上部的出料管道，第二喷雾干燥塔内的出料管道的端部设有便于磷酸氢二钾分散输出的分散器。本发明设计合理、可生产出密度高、颗粒粗、无粉尘、纯度高的磷酸氢二钾，极大的降低了运输成本，增强了市场竞争力。

Double-effect continuous crystallization method of trisodium phosphate

本发明提供了一种磷酸三钠的双效连续结晶方法，包括以下步骤：(1)磷酸三钠溶液由真空泵泵入二效加热器进行加热，在二效分离器中进行气相和液相的分离，磷酸三钠溶液泵入一效加热器。初始蒸汽从一效加热器中进入，出来的二次蒸汽余热给二效加热器供热。(2)一效加热装置在高速循环泵的作用下进行蒸发，经蒸发达到过饱和状态时有部份晶体析出，在晶体达到一定质量，结晶器内晶体的沉降速度大于循环速度，沉入晶体槽达到出料质量时，采用化工流程泵送入到闪蒸结晶罐中进一步闪蒸结晶。(3)母液重新回到设备进行蒸发结晶，晶体进入离心机中进行固液分离。本发明降低了蒸汽消耗量和生产成本，提高了磷酸三钠的产出效率。

Making sodium phosphates

Production of sodium phosphates

Production of alkali metal phosphate

Procedure for the preparation of phosphoric acid and soluble phosphates in water. (Machine-translation by Google Translate, not legally binding)

Process for the preparation of phosphoric acid and water-soluble phosphates, starting from phosphatic minerals, characterized in that a phosphate mineral and a cation exchange resin are reacted with stirring. (Machine-translation by Google Translate, not legally binding)

Patent DE2528895C3

Manufacture of alkali metal phosphates

Alkali metal phosphates can be prepared by adding an alkali metal halide to a solution of phosphoric and nitric acids. The resulting gases can be recovered. After removal of halogen, as by boiling, the solution can be adjusted in nitric acid content and neutralized to yield a fertilizer. Alternatively, the solution can be substantially denitrated, yielding an alkali metal phosphate. Additionally, after denitration the resulting residue can be calcined to yield a water soluble fertilizer. Micronutrients incorporated in the phosphoric acid-nitric acid solution also can be rendered water soluble by this process.

Process for the manufacture of neutralization products from phosphoric acid and sodium carbonate

Production of mixtures containing alkali phosphate and alkali carbonate

Process for the production of trialkali phosphates

Preparation device and method of pharmaceutical grade nutrient phosphate

本发明公开了一种药用级营养磷酸盐的制备装置，包括设置在底座的上端侧壁上的特种燃烧塔、熔磷槽和水化塔，所述熔磷槽与特种燃烧塔之间连通设有喷磷枪，所述特种燃烧塔与水化塔之间连通设有出口输送管道。本发明采用热法磷酸盐工艺制备磷酸盐，无需配合多种净化工艺就能达到质量要求，且制备装置结构合理，设备成本低，操作简便，提高了效率，同时制备装置上设有余热回收机构，在制备的同时利用了制备过程中产生的热能，不但将回收的热能利用在热法磷酸生产自身的工艺中，还可将蒸汽外供其他化工工艺使用，有效地提高了余热回收的效率，避免了热能资源的大量流失。

Process for the production of trisodium phosphate hydrates

Ways to produce pure disodium phosphate.

A kind of method of potassium-bearing shale and low-grade phosphate ore comprehensive utilization

本发明的目的是提供一种利用含钾页岩与中低品位及边界品位磷矿生产磷酸二氢钾的方法。首先将磷矿、含钾页岩、煤在干燥器中分别进行干燥，送入球磨机，磨至粒径≤100μm占90%以上，并将磷矿、含钾页岩、煤以1~5:1~8:1质量比配料并混合均匀成混合料，利用制团机制成直径为2cm球；然后将原料球送入到反应温度为1000~1200℃的反应器，反应后得到的渣利用螺旋排渣机把渣排出来生产水泥熟料当建筑材料使用；反应后得到的气体送入冷凝系统，从冷凝系统出来气体送入到反应器中，同时加入氧气，经过合成反应后得到磷酸二氢钾。

PROCESS FOR PREPARING HIGH PURE ALKALINE PHOSPHATES

Process for defluorinating alkali metal phosphate solutions

PROCESS FOR DEFLUORINATING ALKALI METAL PHOSPHATE SOLUTIONS ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the dis-closure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60 to 120°C into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of par-ticles of which more than 50 % have a size of less than 8 µm. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified al-kali metal phosphate solution.

Drying process

Patent RO59453A

Preparation of detergent grade sodium tripolyphosphate from wet process phosphoric acid and soda ash

A process for preparing detergent grade sodium tripolyphosphate from wet process phosphoric acid comprising neutralizing said acid to a pH at which the Na:P ratio is about 5:3, contacting the resultant mixture of mono- and disodium orthophosphates with an oxidizing agent selected from the group consisting of ozone, hydrogen peroxide and mixtures thereof, in amounts sufficient to oxidize color causing impurities, and drying and heating said orthophosphates to effect the change to sodium tripolyphosphate.

Manufacturing method for lithium phosphate

본 발명은, 리튬 함유 용액에 전해질을 투입하여 제1 용액을 제조하는 단계, 상기 제1 용액에 침전제 및 pH 조절제를 투입하여 pH를 8 이상의 제2 용액을 제조하는 단계 및 상기 제2 용액을 반응시킨 후 고액 분리하여 인산리튬을 수득하는 단계를 포함하고, 상기 전해질의 투입량은, 상기 리튬 함유 용액 1L를 기준으로 , 150g 내지 500g 범위가 되도록 투입되는 인산리튬의 제조방법에 관한 것이다. The present invention provides a step of preparing a first solution by adding an electrolyte to a lithium-containing solution, preparing a second solution having a pH of 8 or more by adding a precipitant and a pH adjusting agent to the first solution, and reacting the second solution. Loading of the electrolyte after a step of obtaining lithium phosphate by solid-liquid separation, and which is, with respect to the lithium-containing solution 1L, a method of manufacturing a lithium phosphate is added to the 150g to 500g range.

Process for the preparation of alkali mono-, di- and triphosphates

Process for the production of trisodium phosphate

A free-flowing crystalline noncaking trisodium phosphate dodecahydrate product is formed by crystallization from water solution in the presence of a small amount of sodium sulfate so that the product formed by evaporation will actually have cocrystallized therewith about 0.25 to 0.80 percent by weight of sodium sulfate on the dry crystal basis. The product prepared by this method of cocrystallizing the trisodium phosphate with a trace of sodium sulfate has the advantage of being a noncaking material under storage conditions of ordinary variable atmospheric temperature and humidity.

Process for the production of phosphoric acid alkali salts

Preparation of colorless alkaline phosphates

Production of two alkali metal salts by a combined ion exchange and crystallisation process

A process for producing an alkali metal nitrate and an alkali metal phosphate in the same process from a phosphate raw material and a nitrate raw material comprising the steps of: a) reacting the phosphate raw material with the nitrate raw material to provide an aqueous nitrophosphate feed, optionally followed by the separation of solid material, b) introducing the aqueous nitrophosphate feed into a first ion exchange step comprising an alkali metal-loaded cationic exchange resin for exchanging cations present in the feed with alkali metal ions present on the resin to obtain a stream enriched in alkali metal ions, c) subjecting the stream from step (b) to a first crystallisation under such conditions that an alkali metal nitrate is crystallised and separating the crystallised alkali metal nitrate from the mother liquor, d) introducing the mother liquor from step (c) into a second ion exchange step comprising an alkali metal-loaded cationic exchange resin for exchanging cations present in the mother liquor with alkali metal ions present on the resin to obtain a phosphate containing stream enriched in alkali metal ions, and e) subjecting the stream from step (d) to a second crystallisation under such conditions that an alkali metal phoshate is crystallised and separating the crystallised alkali metal phosphate from the mother liquor.

Manufacture of alkali metal phosphates

Preparation method of monopotassium phosphate crystal and crystallization tank

本发明公开了磷酸二氢钾晶体制备方法及结晶罐，涉及晶体材料生产技术领域，一种磷酸二氢钾晶体制备方法，具体步骤如下：步骤一、根据溶解度计算纯净水量和磷酸二氢钾原料的投放量，配置饱和度为58‑62％的第一磷酸二氢钾饱和溶液；步骤二、将第一磷酸二氢钾饱和溶液置于提纯设备进行提纯处理，提纯温度控制在90‑100℃，除去其中杂质，将磷酸二氢钾饱和溶液的饱和度控制在59‑61%，得到第二磷酸二氢钾饱和溶液的；通过上述方式，磷酸二氢钾晶体制备方法的生长速度快，缩短生长周期，降低了生产成本，同时，实现可逆剪切流，提升迎流滞止区覆盖面，有助于提高晶体生长质量和速度。

Device and method for recovering extractant in production of monopotassium phosphate by wet-process phosphoric acid extraction

本发明公开了一种湿法磷酸萃取生产磷酸二氢钾中萃取剂回收装置及其方法，涉及萃取法生产磷酸二氢钾技术领域。通过漂浮式回收装置将稠厚器表层的萃合物进行收集，通过潜水泵泵入萃合物收集槽内进行一次反萃后，在萃取剂回收槽静置分相后进行一次排放，向分相后的有机相再次加入反萃剂进行二次反萃，静置分相后进行二次排放，有机相进入板框压滤机内过滤后用于萃取法生产磷酸二氢钾。通过上述装置对萃合物进行反萃回收萃取剂，循环用于生产，减少萃取剂的消耗量，同时避免颗粒杂质随回收后的萃取剂进入萃取系统。采用二次反萃、二次排放，反萃效果更佳。

Detergent compositions

Method for combined treatment of hard alloy grinding waste and scheelite

本发明公开了一种联合处理硬质合金磨削废料和白钨矿的方法，该方法包括：将硬质合金磨削废料与磷酸搅拌混合浸出后固液分离，得到含有碳化钨的固体渣和含有磷酸钴的浸出液；将上述浸出液与碱液搅拌混合反应后固液分离，得到含有钴盐的固体渣和碱性磷酸钠溶液；将碱性磷酸钠溶液降温后固液分离，得到饱和磷酸钠溶液和磷酸钠晶体；将白钨矿与饱和磷酸钠溶液混合球磨，并将得到的矿浆与磷酸钠晶体和水浸出反应后固液分离，得到含有磷酸钙和碱式磷酸钙的白钨分解渣及含有粗钨酸钠的溶液。由此，实现了磷酸‑磷酸钠循环高效分解硬质合金磨削废料和白钨矿，实现了钨一次资源和二次资源的联合处理，降低了生产成本，提升了钨资源利用率。

Pure alkali metal phosphate soln. prodn. - by wet phosphoric acid treatment with alkali metal hydroxide

In prodn. of pure di-alkali metal phosphate soln., with an alkali metal oxide (Me2O):P2O5 ratio of 1.9-2.2:1 from wet phosphoric acid, involving vanadium redn. pretreatment by iron or iron (II) salt addn. and adjsutment to a Me2O:P2O5 ratio of 0.8-1.0:1 at 60-90 deg.C, the novelty is that the pretreated phosphoric acid (stream A) is split into three substreams (B,C,D) and treated by (a) alkali metal hydroxide addn. to substream (B) to achieve a Me2O:P2O5 ratio of 3-4:1; (b) stirring of the treated substream (B) into substream (C) to achieve a Me2O:P2O5 ratio of 2.3-2.8:1; (c) stirring of the mixed streams (B,C) into substream (D) to achieve a Me2O:P2O5 ratio of 1.9-2.2:1; and (d) sepn. of the ppte. from the combined streams (B,C,D). ADVANTAGE - The process increases P2O5 yields in neutralisation purificn. of wet phosphoric acid, without the need for special ppte. treatment. Conversions of 97-99.5 wt.% P2O5 of the wet phosphoric acid into pure di-alkali metal phosphate soln. can be achieved and the ppte. has good filtration properties.

With the method for Wet-process Phosphoric Acid Production potassium dihydrogen phosphate

本发明公开了一种用湿法磷酸生产磷酸二氢钾的方法，向湿法磷酸中依次加入磷矿浆和碳酸钡，使磷酸中硫酸根离子的浓度降至0.5g/L,静置沉降后取上层清液酸为精脱硫稀磷酸，用辛胺和辛醇按照任意比例混合而成的复合萃取剂萃取上述精脱硫稀磷酸，静置分相，耦合磷酸的有机相为萃取液，剩余磷酸为萃余液；向上述萃取液中加入氯化钾进行反应，静置分相，下层为磷酸二氢钾粗溶液、上层为富含盐酸及少量磷酸和氯化钾的有机相；磷酸二氢钾粗溶液过滤后，向滤液中加入氢氧化钾调节溶液pH约为6，静置沉降后滤去杂质得磷酸二氢钾精溶液；向上述磷酸二氢钾精溶液中加净化磷酸调节pH为4‑5，所得溶液浓缩结晶过滤干燥得到磷酸二氢钾产品。工艺流程简单，成本低。

A kind of method using half water law Wet-process Phosphoric Acid Production fertilizer potassium dihydrogen phosphate

一种利用半水法湿法磷酸生产肥料磷酸二氢钾的方法，其特征是,包括如下工艺过程：将半水法湿法磷酸加入磷矿粉进行脱硫，脱硫后的料浆进行过滤，滤渣送入磷酸系统，滤液进入一次中和槽，加入氢氧化钾中和，调节一次中和料浆pH值为2.0‑2.5等，本发明的益效果是：半水湿法磷酸与干磷矿粉反应脱硫，降低半水湿法磷酸SO 4 2‑ ，同时溶入2‑5％的CaO。可减少一、二次中和除杂氢氧化钾的用量。使得磷和钾得到充分利用。以此提高了P 2 O 5 的收率。三次中和过滤母液返回一、二次中和氢氧化钾的配制用水，减少生产过程用水量，同时回收母液的残留的磷和钾，使得磷和钾充分利用，提高磷和钾的收率。

Process for making alkali metal phosphate solutions containing little vanadium

PROCESS FOR MAKING ALKALI METAL PHOSPHATE SOLUTIONS CONTAINING LITTLE VANADIUM ABSTRACT OF THE DISCLOSURE Alkali metal phosphate solutions containing little vanadium are made from phosphoric acid containing vana-dium. To this end, a negative redox potential is estab-lished in the phosphoric acid by addition of a reductant the acid is partially neutralized and an alkali metal-phosphorus-molar ratio between 0.85 and 1.0 is estab-lished, the partial neutralization being continued over a period of at least 10 minutes. The partially neutralized acid is not filtered intermediarily and the alkali metal/ phosphorus-molar ratio is increased to 1.9 to 2.1 in a second neutralization stage, collected precipitate is separated and processed, if desired.

Process for making granulated alkali metal orthophosphates

PROCESS FOR MAKING GRANULATED ALKALI METAL ORTHOPHOSPHATES ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making granu-lated, hydrated alkali metal orthophosphates, To this end, the disclosure provides for one or more anhydrous or par-tially hydrated alkali metal orthophosphates presenting a degree of hydration of less than 90 %, based on the theo-retically possible degree of hydration, and containing an at least 20 % proportion of particles with a size of less than 0.045 mm, to be intensively mixed and granulated with water and an ammonium polyphosphate.

Process for the manufacture of monopotassium phosphate

ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the manufacture of monopotassium phosphate of a high purity without utilizing organic solvents. According to the process, monopotassium sulfate is reacted, at a temperature in the range of between 40 to 100 degrees with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides present in the starting phosphate rock are substantially elininated, with the calcium sulfate resulted thereto. After separating out the calcium sulfate, the filtrate is neutralized to a pH in the range of between 3 to 7, with a calcium-containing compound comprising Ca(OH)2, CaO or CaCO3, or mixtures thereof. From the filtrate obtained, pure monopotassium phosphate is crystallized out. The process is characterized by a high recovery of the P2O5 and K2O values, the monopotassium phosphate produced being completely free of chloride ion.

Improvements in or relating to the manufacture of trisodium phosphate

Crystallized trisodium phosphate dodecahydrate is caused to contain a small amount, say up to 1 per cent, of a soap as an integral part of its crystals, as by crystallizing a concentrated solution of the phosphate containing a small amount of a fatty acid soap, or by introducing a fatty acid into the phosphoric acid before its neutralization. A spraying process may be used for producing the crystals, if desired. The product is characterized by its non-caking properties. The Specification as open to inspection under Sect. 91 comprises also the application of the process to hydrates other than the dodecahydrate. This subject-matter does not appear in the Specification as accepted.

Preparing alkali metal orthophosphates

1512279 Alkali metal orthophosphates: NH 3 OLIN CORP 24 Dec 1975 [30 Dec 1974] 52811/75 Heading C1A A solution of a.m. orthophosphate is prepared, and NH 3 simultaneously recovered by, (a) contacting an aqueous solution or suspension of a monoammonium phosphate, an a.m. ammonium phosphate, or a mixture thereof with a.m. hydroxide in aqueous solution or slurry to provide an aqueous reaction mixture having an a.m.: P mole ratio of 1 to 2, (b) stripping NH 3 from the mix at 130-500 p.s.i.g. in a vertical vapour-liquid contact column, (c) withdrawing an overhead product from the column comprising NH 3 and a bottoms product comprising the a.m. orthophosphate.