38 results about "Phosphate product" patented technology

The invention relates to a washing method of an iron phosphate product, and belongs to the technical field of iron phosphate product preparation, and the washing method comprises the following steps: S1, primary combined washing: putting an iron phosphate material to be treated into water, carrying out heat preservation washing at 80-99 DEG C for a first time, cooling to a second temperature, adding hydrochloric acid, controlling the pH to be 1-2, and carrying out primary combined washing; washing for a second time at a second temperature, and carrying out solid-liquid separation to obtain primary combined washed iron phosphate; s2, phosphoric acid washing: washing the primary combined washing iron phosphate with a phosphoric acid washing solution with a pH value of 0-2 for a third time at a third washing temperature, and carrying out solid-liquid separation to obtain phosphoric acid-washed iron phosphate, the pH value of the phosphoric acid washing solution being lower than the pH value of the primary combined washing; and S3, water washing: washing the phosphoric acid to wash the iron phosphate, and carrying out solid-liquid separation to obtain purified iron phosphate. The treatment method provided by the invention can simply and effectively remove constant amount of impurities in the iron phosphate-containing product and optimize the purity of the iron phosphate product.

Improved partitioning compositions for froth flotation of mineral ores, and improved methods of froth flotation using the partitioning compositions have been developed. The partitioning compositions are suitably added to a mineral ore slurry in a single addition to provide a sparge composition that is ready for sparging. The use of the partitioning compositions obviates the need to adjust the pH of the ore slurry before or after the addition, and further avoids the use of compounds having a flashpoint of 60 °C or less. Meanwhile, the partitioning compositions obtain improved grade and recovery of phosphate product (P2O5) in froth flotation of phosphate ores, when compared to conventional chemistry and methods used for froth flotation of a phosphate ores.

This invention provides a method for preparing ferromanganese phosphate. Using manganese, iron (containing ferric phosphate and / or ferric phosphate dihydrate), and phosphorus as raw materials, a seed induction solution is prepared. The solution is heated to generate NH4Fe(HPO4)2. This new biophase reduces the (Mn+Fe) / P ratio of the product during subsequent recrystallization of ferromanganese phosphate. After aging and recrystallization with ammonium ferromanganese phosphate slurry, a suitable (Mn+Fe) / P ratio of ferromanganese phosphate can be obtained through post-treatment. The preparation method of this invention can control the amount of new phase generated by controlling the amount of ferric phosphate and ferric phosphate dihydrate in the raw materials, thereby controlling the (Mn+Fe) / P ratio in the final product, ferromanganese phosphate. This preparation method is simple to operate, easy to implement, has good process stability, requires no additional surfactant, and offers high controllability of the (Mn+Fe) / P ratio in the product, which can be adjusted according to requirements. The prepared ferromanganese phosphate product has a controllable (Mn+Fe) / P ratio and low impurity content.

The utility model discloses a device that improves food -grade phosphate product packing efficiency, aims at solving the problem of " bin explosion " and unqualified product processing when automatic packing line breaks down. The device is connected with automatic packing hopper and screw conveyer through guide pipe, and the material is conveyed to artificial packing hopper through scraper machine; guide pipe is equipped with switch structure, and the switch structure is driven by electric push rod to control the conduction of piston structure (including plugging ball), and the plugging ball top accommodating groove can reduce abrasion and guarantee sealing; control module adopts time relay and relay module, and realizes the timing extension and contraction of electric push rod. When automatic line breaks down, the device can quickly transfer material, avoid " bin explosion " and unqualified product, and reduce production interruption; when unqualified product is found, the device can be transferred into artificial bin for processing in time. Its simple and reliable structure, controllable cost, not only improves packing efficiency, but also guarantees the continuity of food additive packing link, and is favorable for enterprise benefit improvement.

The invention discloses a production method and a co-production method of a monoammonium phosphate production device, the production device comprises a first device and a second device, and the co-production method is characterized in that the first device and the second device are partially connected, so that the effect that the two devices are simultaneously matched for production is achieved. The method provided by the invention can break through the limitation of the processing capacity of the existing production equipment. The first device and the second device can separately produce monoammonium phosphate, after the first device and the second device are linked for production, part of slurry can be introduced into the second device for drying and other links, and the pressure of the first device is relieved, so that the production load is increased, and the yield is increased. Meanwhile, indexes such as the moisture content of the monoammonium phosphate can be optimized, the moisture of the monoammonium phosphate product is further reduced and is more stable through reasonable treatment of a drying link of the second device, and the stability and consistency of the quality of the monoammonium phosphate are improved.

The method for producing powdery high-concentration monoammonium phosphate by two-stage neutralization of high-impurity raffinate acid is as follows: the by-product raffinate acid generated in the production process of wet purified phosphoric acid is preheated to 65-75 DEG C, ammonia gas is first introduced to perform a first-stage neutralization reaction, the pre-stable impurity neutralization slurry is obtained after constant temperature ripening, ammonia gas is introduced to perform a second-stage neutralization reaction on the pre-stable impurity neutralization slurry, the qualified monoammonium phosphate slurry is obtained after constant temperature ripening, the qualified monoammonium phosphate slurry is continuously subjected to grading concentration, drying is performed after the slurry solid content is concentrated to 70-75%, and the powdery high-concentration monoammonium phosphate product is prepared. The present application takes the by-product high-impurity raffinate acid generated in the production process of wet purified phosphoric acid as the only phosphorus source, realizes full-value utilization of the raffinate acid, the process is green and environmentally friendly, and is suitable for industrialized continuous production.

The utility model relates to the technical field of inositol production, in particular to a production system for preparing magnesium dihydrogen phosphate by utilizing inositol hydrolysis residues, which comprises a hydrolysis residue storage tank, a discharge port of the hydrolysis residue storage tank is communicated with a smashing device, a discharge port of the smashing device is communicated with a reaction kettle, and a discharge port of the reaction kettle is communicated with a filtering device. A liquid outlet of the filtering device is communicated with a first buffer kettle, a discharge port of the first buffer kettle is communicated with a decolorizing kettle, a decolorizing liquid outlet of the decolorizing kettle is communicated with a second buffer kettle, a discharge port of the second buffer kettle is communicated with a crystallization kettle, a crystal outlet of the crystallization kettle is communicated with a drying device, and a discharge port of the drying device is communicated with a product storage tank. According to the production system with the structure, continuous operation can be realized, phosphate in the inositol hydrolysis residues can be recycled, resource waste is avoided, and a high-yield, high-yield and high-purity monopotassium phosphate product can be obtained.

The present application relates to waste resource utilization technical field, specifically to a method for preparing aluminum dihydrogen phosphate from municipal sludge gasification slag, wherein the gasification slag is first crushed and then subjected to acid leaching treatment, so that the phosphorus and aluminum in the gasification slag are partially in the form of ions into the solution, the obtained acid leaching solution is removed from Fe 3+ and other impurity ions through an activated carbon adsorption column, then the aluminum and phosphorus in the solution are precipitated and separated in the form of aluminum phosphate by adjusting the pH value, and finally the obtained aluminum phosphate precipitate is mixed with phosphoric acid at a certain ratio to synthesize aluminum dihydrogen phosphate under heating conditions. The method has simple process and mild conditions, effectively solves the disposal problem of municipal sludge gasification slag, realizes the high-value recovery of phosphorus and aluminum resources, and the prepared aluminum dihydrogen phosphate product has high purity, which has significant environmental and economic benefits.

The invention provides a method for preparing lithium ferromanganese phosphate from ferrous phosphate composite ferromanganese phosphate. The method comprises the following steps: stirring and mixing an iron source, a manganese source, phosphoric acid, and an inorganic carbon source, and then adding an antioxidant and a phosphorus source to obtain a mixed solution; dripping an ammonia solution into the mixed solution, washing with water, filtering, and co-precipitating to obtain a ferromanganese phosphate precursor; crushing the ferromanganese phosphate precursor, adding it into a reactor and heating it, then adding a phosphoric acid solution, a lithium source, a phosphorus source, and an alkaline solution, reacting, filtering, and washing to obtain a filter cake; adding the filter cake, an antioxidant, a ferrous sulfate solution, phosphoric acid, an ammonium dihydrogen phosphate solution, and ammonia water into the reactor to form a mixed slurry; washing and filtering the mixed slurry with water to form a ferrous phosphate composite ferromanganese phosphate precursor; mixing the ferrous phosphate composite ferromanganese phosphate precursor with nano-sized lithium phosphate, an organic carbon source, an additive, and deionized water to form a mixture, and performing ball milling, drying, sintering, screening, batching, packaging, and other processes to obtain a finished lithium ferromanganese phosphate product.

This invention provides a method for preparing lithium iron phosphate from hydroxyferric phosphate and lithium iron phosphate electrode material. Ferrous sulfate is purified to form a ferrous sulfate solution. Hydrogen peroxide, phosphoric acid, ammonium dihydrogen phosphate solution, and ammonia are added to the ferrous sulfate solution to form a mixed slurry. The mixed slurry is kept at room temperature for a period of time, then washed with water and filtered to form hydroxyferric phosphate precursors with different iron-phosphorus ratios. These precursors are then flash-dried and sintered at high temperature to obtain hydroxyferric phosphate precursors with different iron-phosphorus ratios and specific surface areas. The hydroxyferric phosphate precursors are pulverized and mixed to obtain the finished hydroxyferric phosphate product. High-iron-phosphorus ratio hydroxyferric phosphate and low-iron-phosphorus ratio hydroxyferric phosphate are mixed in a certain proportion and then formulated with lithium phosphate, lithium iron phosphate, and electrode material in a specific ratio, with the addition of a carbon source and additives to form a mixture. The mixture is then subjected to ball milling, sand milling, spray drying, sintering, pulverizing, sieving, batching, and packaging processes to obtain the finished lithium iron phosphate product.

The invention discloses a gas chromatography method for detecting the content of trioctyl phosphate products and impurities, and belongs to the technical field of organic chemical detection. The core of the method is that (trimethylsilyl) diazomethane (TMSCH2N2) is adopted as a derivatization reagent, and dioctyl phosphate (P204) in a sample is subjected to rapid and safe derivatization at room temperature; an optimized dichloromethane-hexane mixed solvent system is adopted for dilution, so that the solubility is remarkably improved, and the toxicity is reduced; a first-order heating rapid screening method (17min) is suitable for industrial quality control, a multi-order heating accurate quantification method (29min) is suitable for small-scale test process research and development, and trioctyl phosphate (TOP), P204, isooctyl alcohol, isooctyl ether and chloro-isooctane can be accurately quantified at the same time. The method solves the problems of high toxicity, low efficiency, narrow detection range, single mode and the like in the prior art, and has the remarkable advantages of safety, high efficiency, accuracy, environmental protection and wide adaptability.

The application provides a method for preparing lithium iron phosphate from iron hydroxyl phosphate and ferrous oxalate. The ferrous sulfate is purified to form a ferrous sulfate solution. Hydrogen peroxide, phosphoric acid, ammonium dihydrogen phosphate solution and ammonia water are sequentially added to the solution to form a mixed slurry. The mixed slurry is heated and kept warm, and then washed with water and filtered under pressure to form an iron hydroxyl phosphate precursor with different iron and phosphorus ratios. The iron hydroxyl phosphate precursor is dried by flash evaporation and sintered at high temperature and then crushed to obtain an iron hydroxyl phosphate precursor with different iron and phosphorus ratios and different specific surface areas. The iron hydroxyl phosphate precursor is crushed and mixed to obtain an iron hydroxyl phosphate product. The high-iron and low-iron ratio iron hydroxyl phosphate is mixed with ferrous oxalate, lithium phosphate, lithium carbonate and ammonium dihydrogen phosphate in a certain proportion, and a carbon source and an additive are added to form a mixture. The mixture is subjected to a series of processes such as ball milling, sand milling, spray drying, sintering, crushing, screening, batching and packaging to obtain a lithium iron phosphate product.

The present application relates to the technical field of immobilized enzyme production, and particularly relates to a phosphate waste liquid treatment process in immobilized enzyme production, which comprises the following steps: (1) the phosphate waste liquid enters a cation resin column and an anion resin column in sequence, and a second effluent is collected; (2) a potassium hydroxide solution elutes the anion resin column, and the collected desorption liquid is subjected to concentration, cooling, filtration and washing, and dipotassium hydrogen phosphate crystals and a first mother liquor are collected respectively; (3) a phosphoric acid solution elutes the cation resin column, and the collected desorption liquid is subjected to concentration and other operations, and dipotassium hydrogen phosphate crystals and a second mother liquor are collected respectively; (4) the first and second mother liquors are combined, and filtration, pH adjustment and other operations are performed to obtain a potassium dihydrogen phosphate product; and (5) the dipotassium hydrogen phosphate crystals are combined, water and a decoloring agent are added, and stirring and other operations are performed to obtain a dipotassium hydrogen phosphate product. The above treatment process can effectively treat the phosphate waste liquid in the immobilized enzyme production, and two products, the potassium dihydrogen phosphate and the dipotassium hydrogen phosphate, are obtained.

The invention relates to a method for preparing ferrous phosphate by using reduced titanium, which comprises the following steps: 1) detecting the components of the reduced titanium to obtain the iron content in the reduced titanium, and controlling the iron content in the reduced titanium to be 30-60wt%; (2) carrying out acid leaching on the reduced titanium by using dilute phosphoric acid, carrying out solid-liquid separation to obtain a leaching solution and filter residues, washing the filter residues with water, preparing titanium dioxide, and preparing ferrous phosphate by using the leaching solution; dilute phosphoric acid with the mass fraction of 10% is adopted during acid leaching, and the molar ratio of Fe to P is controlled to be 1: 1.9. According to the method, the titanium-iron separation efficiency of reduced titanium can be improved, and a battery-grade ferrous phosphate product with relatively high value can be obtained.

The invention relates to a reaction-membrane absorption coupling device for synthesizing trioctyl phosphate and recovering HCl and a process technology thereof. A phosphorus oxychloride-isooctanol method is generally adopted to synthesize trioctyl phosphate industrially, a byproduct HCl gas in a reaction system is removed under high-temperature and vacuum conditions to improve the yield of trioctyl phosphate, but the problems of high energy consumption, more byproducts, large wastewater amount and the like still exist. By establishing a reaction-membrane absorption coupling device, continuous removal of the byproduct HCl gas in the synthesis process of trioctyl phosphate is realized under mild reaction conditions, side reactions are inhibited, the yield of trioctyl phosphate is improved, high-purity HCl gas is recovered, and the method is suitable for industrial production. And after the reaction is finished, carrying out post-treatment to obtain a high-purity trioctyl ester product. The device has the advantages of high yield of trioctyl phosphate, recoverable HCl, low energy consumption, less three wastes and the like, and is expected to replace the existing production device for green synthesis of trioctyl phosphate.

The present application belongs to the technical field of solid waste resource utilization, and particularly relates to a sludge incineration slag resource utilization method. The present application mixes sludge incineration slag, water and acid for acid leaching to obtain an acid leaching solution; the acid leaching solution is adjusted to a pH value of 3-5 by alkali for first alkali treatment to obtain first alkali treatment slag; the first alkali treatment slag is adjusted to a pH value of 11.5-13.5 by alkali for second alkali treatment to obtain a second alkali treatment solution; and the second alkali treatment solution is used as a raw material to prepare a ferric phosphate product and / or a superphosphate product. The present application realizes a high dissolution rate of phosphorus in the sludge incineration slag, thereby effectively realizing resource recycling of phosphorus in the incineration slag waste, and simultaneously obtaining a ferric hydroxide precipitate product and an aluminum hydroxide precipitate product, with low recovery cost, saving consumption of phosphorus ore and other raw materials, and realizing resource utilization of the sludge incineration slag.

A method and system for preparing ferric phosphate, comprising the steps of: using a purified ferrous by-product solution as the iron source and a wet-process phosphoric acid purified solution as the phosphorus source, mixing an oxidant for a full oxidation reaction to obtain an oxidized solution; subjecting the oxidized solution to a precipitation reaction and aging, followed by washing and drying to obtain the ferric phosphate product; during the precipitation reaction and aging process, a mixture of ammonia and air is used as the alkali source and aeration source to adjust the pH value of the oxidized solution and generate an air flotation effect, reducing the settling velocity of the generated solid particles. This invention achieves resource utilization of by-product ferrous salts, reduces raw material costs, minimizes the impact of raw material solubility on production efficiency, and produces a ferric phosphate slurry with a solid content exceeding 20%, while also exhibiting a high concentration of by-product salts, thus reducing energy consumption costs in subsequent evaporation and concentration processes and improving the production efficiency of ferric phosphate.

The invention belongs to the technical field of batteries, and provides a phosphate product, an electrolyte and a battery, the phosphate product comprises a silicon-based fluorophosphate compound and a siloxane compound, and the siloxane compound is obtained by hydrolyzing the silicon-based fluorophosphate compound; based on the mass of the silicon-based fluorophosphate compound, the content m of the siloxane compound is more than 0 and less than or equal to 1.0%; the silicon-based fluorophosphate compound is shown as a formula 1, the siloxane compound is shown as a formula 2; the formula 2 is shown in the specification; wherein R1, R2, R3, R '1, R' 2 and R '3 are respectively and independently selected from any one of H, F, C1-C4 alkyl groups, C1-C4 fluoroalkyl groups, C2-C4 alkenyl groups, C2-C4 fluoroalkenyl groups, C2-C4 alkynyl groups, C2-C4 fluoroalkynyl groups, C5-C7 cycloalkyl groups, R4 substituted phenyl groups and R5 substituted benzyl groups. The silicon-based fluorophosphate product is applied to batteries and shows good low-temperature performance and high-temperature performance.

Improved partitioning compositions for froth flotation of mineral ores, and improved methods of froth flotation using the partitioning compositions have been developed. The partitioning compositions are suitably added to a mineral ore slurry in a single addition to provide a sparge composition that is ready for sparging. The use of the partitioning compositions obviates the need to adjust the pH of the ore slurry before or after the addition, and further avoids the use of compounds having a flashpoint of 60° C. or less. Meanwhile, the partitioning compositions obtain improved grade and recovery of phosphate product (P2O5) in froth flotation of phosphate ores, when compared to conventional chemistry and methods used for froth flotation of a phosphate ores.

This invention discloses a process for producing pharmaceutical-grade potassium dihydrogen phosphate using corn soaking water. It relates to the field of potassium dihydrogen phosphate production technology. The process involves potassium phytate adsorption and desorption, potassium phytate concentration, potassium phytate hydrolysis, separation, concentration, decolorization and filtration, wet preparation of potassium dihydrogen phosphate, drying, and packaging. The process effectively removes divalent and polyvalent metal ions, chloride ions, and organic impurities, resulting in a high-purity potassium dihydrogen phosphate product that meets pharmaceutical-grade standards.

This invention relates to a method for the comprehensive utilization of components from the crystallization mother liquor of 13X molecular sieve. The method uses these components to replace part of the liquid alkali in the synthesis of ferric phosphate, and utilizes non-commercially applicable micro-particle 13X molecular sieve as seed crystals for ferric phosphate preparation, thus fully utilizing the components of the 13X molecular sieve crystallization mother liquor. This invention rationally utilizes the liquid alkali component and non-commercially applicable micro-particles in the 13X molecular sieve mother liquor, saving on ferric phosphate production costs, improving the utilization rate of by-products, and simultaneously improving the morphology and tap density of the ferric phosphate product. It also achieves zero-waste production of 13X molecular sieve. The preparation method of this invention is simple to operate and can obtain high-quality ferric phosphate.

The invention discloses an improved device and method for preparing monopotassium phosphate and co-producing ammonium chloride and a phosphorus-potassium fertilizer through an organic extraction method, and relates to the technical field of monopotassium phosphate production. The raw material preparation device comprises a solution preparation device and a strip liquor preparation device; the monopotassium phosphate feed liquid preparation device comprises a monopotassium phosphate extraction device, a salt washing device, a reverse extraction device and a water washing device which are connected in sequence, the solution preparation device is connected with the monopotassium phosphate extraction device, and the reverse extraction liquid preparation device is connected with the reverse extraction device; the monopotassium phosphate product production device is used for carrying out filtering, size mixing, concentration crystallization, separation, drying and packaging on monopotassium phosphate; the ammonium chloride product production device is used for filtering, concentrating, crystallizing, separating, drying and packaging ammonium chloride; and the phosphorus-potassium fertilizer deep processing and utilizing device is used for drying and packaging the phosphorus-potassium fertilizer. Three products can be produced at the same time, and the purposes of the optimal quality of the monopotassium phosphate product and the most economical cost are achieved.

The invention provides a preparation method of high-pressure-density battery-grade iron phosphate and an aging device thereof, and the preparation method comprises the following steps: S1, primary reaction: adding a monoammonium phosphate solution and hydrogen peroxide into a ferrous sulfate solution at the same time, and stirring; s2, ammonia water is added into the mixture obtained in the S1, the pH is adjusted, and the reaction is as follows; s3, filtering and washing the mixture obtained in the step S2 to obtain a basic iron phosphate yellow material; s4, aging reaction: stirring and scattering the basic iron phosphate yellow material obtained in S3, adding phosphoric acid, heating and stirring for crystal transformation, and S5, washing and drying the iron phosphate dihydrate white material, and calcining to obtain a high-compaction iron phosphate finished product. According to the preparation method and the aging device of the high-pressure-density battery-grade iron phosphate, the production cost can be reduced.

The application belongs to the field of biotechnology separation, and discloses a desalination method in the production process of sodium mannose phosphate, which comprises the following steps: centrifugal ultrafiltration is performed on the sodium mannose phosphate reaction solution obtained through enzyme catalysis reaction, so that the membrane-passing clear liquid is obtained; and the membrane-passing clear liquid is subjected to desalination through electrodialysis, so that the sodium mannose phosphate product is obtained. The method is suitable for the removal of phosphate, hypophosphite and other ions with small molecular weight, and the method is simple in operation, efficient in desalination and green in environmental protection.

This invention belongs to the field of biotechnology separation and discloses a purification method for crude sodium mannose phosphate. The method includes: centrifuging and ultrafiltration of the sodium mannose phosphate reaction solution obtained from a catalytic reaction to obtain a membrane-filtered supernatant; purifying the supernatant using a two-step electrodialysis method, repeating the purification 2-5 times to obtain an aqueous solution of sodium mannose phosphate; and then drying the solution to obtain a high-purity sodium mannose phosphate product. Different ion exchange membranes are used in the two-step electrodialysis method. This method, through electrodialysis, combines a homogeneous membrane and an alloy membrane to achieve effective separation of nonionic impurities such as mannose, as well as various phosphates, from sodium mannose phosphate.

The application discloses a process method for producing superfine powder potassium dihydrogen phosphate by using corn soaking water and relates to the technical field of potassium dihydrogen phosphate production. Corn soaking water is subjected to anion exchange resin column, nanofiltration membrane, hydrolysis tank and simulated moving bed chromatographic separation to obtain potassium dihydrogen phosphate solution and inositol solution. The potassium dihydrogen phosphate solution is concentrated by a multi-effect concentrator and a crystallizer to obtain high-concentration potassium dihydrogen phosphate raw material solution. Then, the raw material solution is rapidly cooled under the double actions of vacuum evaporation and refrigerated water to obtain a crystallization material solution. The crystallization material solution is subjected to dehydration in a centrifugal machine. The centrifugal wet product after dehydration is subjected to drying and sieving in a flash evaporation dryer to obtain potassium dihydrogen phosphate products.

This invention discloses a method for the resource-based treatment of chlorine- and COD-containing phosphoric acid waste liquid, comprising the following steps: (1) vacuum distillation: passing the phosphoric acid waste liquid into a vacuum distillation device for vacuum distillation treatment; (2) blending: adding water to the blending vessel for dilution treatment; (3) neutralization; (4) settling and stratification: the neutralized waste liquid is settling and stratified in an oil separator; (5) one-step impurity removal reaction and filtration; (6) two-step impurity removal reaction and filtration; (7) synthesis of dihydrate ferric phosphate; (8) water washing and aging; (9) drying and calcination. This invention, through multi-stage treatment, can efficiently remove high chloride ions and high COD from phosphoric acid waste liquid, with a removal rate of over 98%; at the same time, through further processing, a 30% hydrochloric acid solution product and a sodium phosphate solution are obtained, and after further reaction and treatment, a qualified anhydrous ferric phosphate product is obtained, enabling the waste to be recycled and reused. This invention has outstanding effects, simple process equipment, convenient operation, and is easy to apply in industrial production.

The invention discloses iron phosphate and a production method thereof, and belongs to the technical field of iron phosphate. The production method comprises the following steps: continuously introducing part of a raw material solution into a first reaction container with first bottom water, and carrying out a primary reaction to obtain a first reaction product; continuously introducing the first reaction product into a second reaction container with second bottom water, continuously adding the remaining raw material solution into the second reaction container for deep reaction to obtain a second reaction product, and carrying out solid-liquid separation; and when the raw material solution in a certain period is completely added, supplementing bottom water into each reaction container, and repeating the charging and reaction processes in the previous period to carry out continuous production. The method is simple in process and easy to operate, continuous production can be achieved, the production time is effectively shortened, an oxidizing agent and alkali liquor are not needed in the production process, use of chemical reagents is reduced, and generation and treatment of by-products are avoided. The iron phosphate product obtained by the method is controllable in particle size and meets the battery grade standard.

The invention relates to a method for separating heavy metals and recovering phosphorus and iron from sludge incineration ash. The method comprises the following steps: carrying out water washing pretreatment on the sludge incineration ash; leaching the washed ash with an organic acid solution to obtain a leaching solution rich in phosphorus and heavy metals and first residues; adjusting the pH value of the leachate to 5.0-7.0, and separating heavy metal precipitates; the pH of the heavy metal removal liquid is adjusted to 8.5-10.5, and a phosphate product is precipitated and recovered; and the first residues are subjected to magnetic separation to recover iron. Effective separation of heavy metal in the sludge incineration ash and efficient recovery of phosphorus and iron are achieved, and the method has the advantages of being simple in technological process, environmentally friendly, high in resource recovery rate and the like.

This application relates to the field of phosphoric acid preparation technology, and more particularly to a method for preparing industrial-grade phosphoric acid based on hydrochloric acid decomposition of phosphate rock. The method includes: pulping phosphate rock to obtain a phosphate rock slurry; acidifying the phosphate rock slurry with hydrochloric acid to obtain an acid-hydrolyzed slurry; filtering the acid-hydrolyzed slurry to obtain an intermediate filter material; extracting the intermediate filter material using a composite extractant to obtain calcium chloride product and a supported organic phase; and reverse-extracting the supported organic phase with water to obtain dicalcium phosphate product and industrial-grade phosphoric acid. The extraction is performed in a rotary microchannel device. The composite extractant comprises a mixed organic phase of trioctylamine, tributyl phosphate, and triethylamine in decreasing mass concentrations. This method, through the synergistic effect of multi-stage gradient impurity removal throughout the entire process and deep purification by a core innovative unit, improves the purity and yield of phosphoric acid produced by wet acid hydrolysis from three dimensions: pre-removal of impurities at the source, selective separation of core soluble impurities, and precise interception of trace impurities at the terminal stage, while achieving full recovery of phosphate rock.