207results about "Phosphates" patented technology

In one aspect, a lithium manganese iron phosphate material includes a core, and a material of the core is represented by a general formula of LixMgyMnzFeaAlbPO4, where x is ranged from 1.008 to 1.05, y is ranged from 0 to 0.006, z is ranged from 0.4 to 0.6, a is ranged from 0.388 to 0.6, and b is ranged from 0 to 0.012.

The invention belongs to the technical field of lithium ion battery materials, and discloses a composite modified negative electrode material and a preparation method and application thereof, the composite modified negative electrode material comprises a Mn2Si (P2O7) 2 nanometer material, nanometer silicon and layered graphite, and the Mn2Si (P2O7) 2 nanometer material, the nanometer silicon and the layered graphite material are uniformly distributed. The composite modified negative electrode material has good structural stability, and silicon element and nano silicon in pyrophosphate silicate in the negative electrode material can form Si-Si covalent bonds, so that the adhesive force of a surface composite layer of the negative electrode material can be greatly improved, polymer of the nano silicon can be inhibited, the volume expansion of a silicon negative electrode can be relieved, and the cycle performance of the battery can be improved.

The utility model relates to an ammonium phosphate evaporation and concentration system and belongs to the field of chemical engineering. The system comprises a concentrated ammonium phosphate pump, a concentrated ammonium phosphate storage tank, an I-effect evaporation chamber, an I-effect heater, an I-effect circulating pump, an I-effect charging pump, an II-effect evaporation chamber, an II-effect heater, an II-effect circulating pump, an II-effect charging pump, an III-effect evaporation chamber, an III-effect heater and an III-effect circulating pump. By adopting the system and the method, low-pressure saturated live steam is utilized to indirectly heat dilute ammonium phosphate to generate secondary steam and tertiary steam to continuously heat the dilute ammonium phosphate to produce concentrated ammonium phosphate. Compared with a two-effect evaporation concentration process flow which is widely used at present, the three-effect countercurrent evaporation concentration process flow saves energy by 47%. The utility model aims at saving energy, reducing consumption, reducing carbon emission of a production device and protecting the environment.

The invention discloses an organophosphorus degradation and synchronous recovery system based on a double-cathode induced electro-Fenton reaction. An induced iron electrode plate and an electrochemical assembly with double cathode plates are arranged in an electrolytic tank; the double cathode plates are a gas diffusion cathode plate and an iron reduction cathode plate; the gas diffusion cathode is used for reducing oxygen to generate hydrogen peroxide, the induction iron electrode releases ferrous ions under the action of an electric field, the ferrous ions and the hydrogen peroxide are subjected to a Fenton reaction, organic phosphorus is degraded into PO4 < 3->, Fenton reaction by-products Fe < 3 + > and PO4 < 3-> form iron phosphorus precipitates, and degradation of the organic phosphorus and synchronous recovery of orthophosphate are realized; excessive Fe < 3 + > is adsorbed by the iron reduction cathode and is further reduced into Fe < 2 + > which enters the solution again to participate in the Fenton reaction, so that the reaction efficiency is improved, and Fe < 3 + > / Fe < 2 + > circulation is promoted while slow release of iron is realized. The device is simple in structure, low in maintenance cost and high in operability, and the purpose of efficiently recycling phosphorus resources is achieved.

The invention relates to the technical field of ammonium dihydrogen phosphate preparation, and discloses a high-purity ammonium dihydrogen phosphate crystallization device and a method thereof.The high-purity ammonium dihydrogen phosphate crystallization device comprises a first-stage crystallization system, a first-stage centrifugal separation system, a second-stage crystallization system and a second-stage centrifugal separation system which are connected in series. The primary crystallization system comprises a crystal elimination heater, a crystal elimination mixer, a bag filter and a DTB flash cooling crystallizer which are connected in sequence, and is used for primarily purifying a concentrated solution; the primary centrifugal separation system is used for separating primary crystals; the second-stage crystallization system comprises a crystal dissolving tank, an OSLO cooling crystallizer and the like, and deep crystallization is carried out after the first-stage crystal is dissolved; the secondary centrifugal separation system is used for separating secondary crystals; through two-stage crystallization coupling, mother liquor graded circulation, a unique gradient washing process and active impurity control, efficient and continuous production of battery-grade ammonium dihydrogen phosphate with wet-process phosphoric acid as a raw material is realized, the product purity is high, the process flow is simplified, the cost is low, and the system operation is stable.

Disclosed are a room-temperature and ambient-pressure superconducting ceramic and methods for producing the same. The superconducting ceramic is represented by Formula 1: A10-xBx(PO4)6O wherein A is Ca, Ba, Sr, Sn or Pb, B is Cu, Cd, Zn, Mn, Fe, Ni or Ag, and x is 0.1 to 2.0. The superconducting ceramic exhibits superconductivity at room temperature and ambient pressure. The methods are suitable for producing the superconducting ceramic.

The utility model relates to the technical field of phosphorite treatment, in particular to a device and system for preparing ammonium phosphate and byproduct nitrophosphate fertilizer by decomposing phosphorite with nitric acid. The device comprises an acidolysis tank, the acidolysis tank is connected to a first separator, the first separator is connected to a first crystallizer, the first crystallizer is connected to a second separator, the second separator is connected to a decalcification tank, the decalcification tank is connected to a denitration tank, and the denitration tank is connected to a second crystallizer. The denitration tank is respectively connected to the repulping tank and the purification equipment; the re-pulping tank is connected to a neutralizing tank, and the neutralizing tank is connected to a first concentrator; and the purification equipment is connected to the second concentrator. According to the device disclosed by the invention, the mother liquor generated by the acidolysis tank is deeply processed to prepare monoammonium phosphate and purified phosphoric acid, meanwhile, a byproduct white fertilizer can be processed into a phosphorus (potassium) nitrate fertilizer, and a byproduct white gypsum is obtained.

The invention discloses a resourceful treatment method of a lithium iron phosphate waste liquid, which comprises the following steps: filtering the lithium iron phosphate waste liquid to obtain a lithium iron phosphate filtrate; adding an oxidizing agent into the lithium iron phosphate filtrate until the redox potential value reaches a potential preset value to obtain redox liquid; adding phosphate into the redox solution for precipitation, and filtering to obtain an iron phosphate crystal product and a lithium ion filtrate; adding sodium carbonate into the lithium ion filtrate for precipitation, and filtering to obtain a lithium carbonate crystal product and wastewater. According to the method, redox reaction and chemical precipitation are combined, effective resource utilization of the lithium iron phosphate waste liquid is achieved, iron elements and lithium elements are subjected to fractional precipitation, the resource recovery rate can be effectively increased, the resource recovery benefit is high, the recovery purity can be effectively improved, the operation difficulty is low, and the method is suitable for industrial production. And the recovery cost and the equipment cost can be effectively saved.

A method for production of pure phosphates comprises providing (S10) of a strip solution being an aqueous solution of one of monoammonium phosphate and monopotassium phosphate, loaded with stripped phosphate from a feed liquid comprising phosphoric acid contaminated by heavy metals and iron A base is added (S20) into the separated strip solution raising the pH to 2 – 5.5, forming of a heated solution and causing compounds comprising iron and phosphate to precipitate. A precipitant, precipitating heavy metals, is added (S30). Precipitated compounds comprising iron and phosphate and precipitated heavy metal compounds are separated (S40). The heated filtered solution is thereafter cooled off (S50) into a cooled solution, causing precipitation of phosphate compounds. The precipitated phosphate compounds are removed (S60) from the cooled solution. The cooled solution is recirculated (S70) for use as input strip solution in the stripping operation. A system for production of pure phosphates is also disclosed.

A method of recovery of ammonium phosphate comprises providing a start material (100) comprising struvite into a first aqueous process liquid (101) comprising monoammonium phosphate. The first aqueous process liquid (101) is mixed. Thereby the start material (100) comprising struvite is converted into monoammonium phosphate and / or diammonium phosphate in solution and a residue (103) comprising newberyite as a precipitate. The residue (103) is separated from the first aqueous process liquid (101), thereby giving a second aqueous process liquid (104) comprising monoammonium phosphate and / or diammonium phosphate. At least a part of said second aqueous process liquid (104) or a part of an aqueous process liquid (107, 112) emanating therefrom is returned into the first aqueous process liquid. Phosphoric acid (110) is added. A method for extracting nitrogen from reject water, an arrangement (1) for recovery of monoammonium phosphate and a system for extracting nitrogen from reject water is also disclosed.

The present invention relates to a method for producing liquid NPK fertilizer, characterized in that the reactants K2CO3 or KHCO3, NH4HCO3, and H3PO4 are reacted in an aqueous solution to produce potassium and ammonium phosphate salts, particularly K3PO4 and (NH4)3PO4; the reaction is carried out in multiple steps and includes at least one exothermic reaction and at least one endothermic reaction; and the temperature of the reaction is controlled by adjusting the amount and rate of addition of each reactant in the various steps so as to maintain the reaction mixture within a desired temperature range, preferably between 5°C and 50°C, throughout the reaction, without the need for external cooling or heating devices to control the temperature of the reaction. In a more specific embodiment, the method according to the invention is characterized in that at least one exothermic reaction comprises the reaction of K2CO3 with HO to produce KHCO3 and KOH and / or the reaction of KHCO3 with H3PO4 to produce K3PO4, CO2, and HO, and at least one endothermic reaction comprises the reaction of NH4HCO3 with H3PO4 to produce (NH4)3PO4, CO2, and HO.

The invention discloses a method for producing 55% powdery monoammonium phosphate by using filter-press white fertilizer and phosphoric acid sludge acid, and belongs to the technical field of production of powdery monoammonium phosphate. According to the method for producing novel 55% powdery monoammonium phosphate in a tubular reactor by using waste white fertilizer and phosphoric acid sludge acid which cannot be treated in the filter-press production process, the production process flow is greatly shortened, the production cost is reduced, and the production efficiency is improved. The number of process pipelines and production equipment is reduced, the length of the process pipelines is shortened, the energy consumption and the equipment maintenance cost are greatly reduced, and the effects of saving energy, reducing consumption and improving quality and efficiency are achieved; meanwhile, the waste white fertilizer which cannot be treated in the filter pressing production process and the waste phosphoric acid slag slurry generated in phosphoric acid production are treated, and the production cost is reduced.

The invention relates to the field of wastewater treatment, in particular to a method for treating wastewater containing phosphorus, aluminum, silicon and organic amine generated in a molecular sieve preparation process, which comprises the following steps: 1) adding a pH regulator and an optional silicon-aluminum component regulator into the wastewater to enable the pH of the wastewater to be 10-14 and the molar ratio of silicon to aluminum in the wastewater to be (1.0-1.8): 1, obtaining a first mixture containing an oil phase; 2) distilling the first mixture obtained in the step 1) to obtain a gas phase and a second mixture; 3) performing solid-liquid separation on the second mixture obtained in the step 2) to obtain a first solid phase and a third mixture; and 4) crystallizing the third mixture obtained in the step 3) to obtain a second solid phase. According to the method, harmless treatment can be conducted on the wastewater, organic amine, phosphorus, aluminum, silicon and the like in the wastewater can be efficiently recovered, and the recovery rate and the purity of the recovered product are high.

The invention discloses a phosphoric acid ammoniation evaporator and a phosphoric acid ammoniation neutralization system and method.The phosphoric acid ammoniation neutralization system comprises a heat exchanger and a phosphoric acid ammoniation evaporator, and the phosphoric acid ammoniation evaporator comprises an evaporator body and a circulating ammonium phosphate pipeline connected with the evaporator body; a circulating ammonium phosphate inlet and an ammonium phosphate product outlet are formed in the two side faces of the evaporator body respectively, the position of the ammonium phosphate product outlet is higher than that of the circulating ammonium phosphate inlet, a gas outlet is formed in the top of the evaporator body, a circulating ammonium phosphate outlet is formed in the bottom of the evaporator body, and the two ends of a circulating ammonium phosphate pipeline are communicated with the circulating ammonium phosphate inlet and the circulating ammonium phosphate outlet respectively. An ammonia inlet and an acid inlet are respectively formed in the circulating ammonium phosphate pipeline, and the ammonia inlet is positioned behind the acid inlet along the circulating direction of ammonium phosphate; a heating medium inlet of the heat exchanger is connected with a gas outlet of the evaporator body, a heating medium outlet of the heat exchanger is connected with a condensate pipeline, a refrigerant inlet of the heat exchanger is connected with a phosphoric acid liquid pipeline, and a refrigerant outlet of the heat exchanger is connected with the acid inlet through a pipeline.

The invention discloses a DAP production system and method.The DAP production system comprises a DAP pelletizer, an MAP pelletizer, a classifying screen and a crusher which are sequentially arranged, the DAP pelletizer and the MAP pelletizer are internally connected with a first tubular reactor and a second tubular reactor respectively, phosphoric acid with the low concentration reacts with ammonia in the first tubular reactor, and phosphoric acid with the low concentration reacts with ammonia in the second tubular reactor; then spraying the ammonium phosphate slurry on a material in a DAP granulator for granulation, burying an ammonia distributor in the material, ammonifying and neutralizing ammonium phosphate in the material, and feeding the neutralized and granulated granular DAP material into an MAP granulator; the method comprises the following steps of: reacting phosphoric acid with high concentration with ammonia in a second tubular reactor to generate ammonium phosphate slurry, spraying the ammonium phosphate slurry into an MAP granulator, forming MAP fine particles from the slurry in airflow in the MAP granulator, drying and granulating the material by using reaction heat, screening the dried material, and taking the qualified material as a target product.

The invention discloses a process for reducing rare earth loss in value adjustment of phosphorus-containing rare earth feed liquid by using an iron phosphorus removal and segmented value adjustment method, and belongs to the field of rare earth hydrometallurgy. The process comprises the following steps: preparing iron, heating, adding carbon for material settling, controlling REO concentration, performing primary value adjustment, performing solid-liquid separation, performing secondary value adjustment and performing solid-liquid separation again. The method comprises the following steps: adding an iron material of which the stoichiometric ratio is 1-2 times that of a phosphorus-containing rare earth feed liquid into the phosphorus-containing rare earth feed liquid, raising the temperature to 50 DEG C or above, adding a carbon precipitation material to regulate the acidity to 0.1-0.6 mol / L, controlling REO to be less than or equal to 200g / L, regulating the pH to 0.5-2, carrying out primary phosphorus removal, separating to obtain iron phosphate slag with low rare earth content, and regulating the pH of clear liquid to 4-5 to further remove impurities; according to the method, the rare earth content in the value-adjusted slag is remarkably reduced, the dry basis CeO content of the primary value-adjusted slag can be as low as 1.61%, the rare earth yield is increased, the occupied area of a slag warehouse is reduced, recycling of phosphorus resources is achieved, and the production cost is reduced.

Embodiments of the present invention relate to olivine-type cathode materials useful in lithium-ion batteries. More specifically, embodiments of the present invention comprise methods for the application of carbon coatings to oxidized olivine-type lithium-transition metal-phosphate (LMP) products synthesized using various synthesis routes.

The present invention relates to olivine-type cathode materials useful in lithium-ion batteries. More specifically, the present invention includes methods for stoichiometrically balancing olivine-type lithium-transition metal-phosphate materials synthesized using one of the various synthesis routes known in the art.

The utility model discloses an ammonium sulfate and monoammonium phosphate mixed solution evaporative crystallization salt separation treatment system which comprises a preheating unit, an ammonium sulfate evaporation concentration unit, an ammonium sulfate evaporation crystallization unit, a recovery heat exchange unit, an ammonium sulfate post-treatment unit, a monoammonium phosphate cooling crystallization unit, a monoammonium phosphate post-treatment unit and a carnallite treatment unit. According to the technical scheme adopted by the utility model, a mixed solution containing ammonium sulfate and monoammonium phosphate is subjected to combined treatment, so that qualified ammonium sulfate crystal salt, monoammonium phosphate crystal salt and mixed salt can be obtained, and the by-product benefit of a wastewater treatment system can be effectively improved.

The invention relates to the technical field of wet-process phosphoric acid purification, in particular to a strong phosphoric acid purification device for high-quality ammonium dihydrogen phosphate production and a method thereof.The strong phosphoric acid purification device comprises a settling tank, the settling tank is connected with a desulfurization reaction tank, the desulfurization reaction tank is connected with a de-heavy component, the de-heavy component is connected with the settling tank through a return pipe, and the settling tank is further connected with a flocculant compounding tank; the settling tank is connected with the filter, a liquid outlet end of the filter and the hydrogen peroxide storage tank are respectively connected with two inlets of the static mixer, and an outlet of the static mixer is connected with the filler reaction tower; the heavy component is further connected with a tail gas washing assembly through a tail gas pipe, the tail gas washing assembly is further connected with a lye tank, the tail gas washing assembly is connected with a sodium sulfide storage tank through a liquid outlet pipe, and the sodium sulfide storage tank is connected with the heavy component; alkali liquor used by the tail gas washing assembly absorbs hydrogen sulfide gas to generate a sodium sulfide solution which is used as a heavy component removal agent for heavy component removal reaction, so that efficient coordination of tail gas washing and heavy component removal reaction is realized, and consumption of the alkali liquor and the sodium sulfide solution is reduced.

The invention discloses an anti-blocking screening material passing pipe of an ammonium phosphate external loop reactor, and relates to the field of ammonium phosphate crystal screening, the anti-blocking screening material passing pipe comprises a circulating screening box and a circulating pipeline, the circulating pipeline comprises a pressurizing pipe, a circulating pipe, a feeding pipe and a circulating pump, one end of the pressurizing pipe is connected with the circulating screening box, and a screening plate is arranged in the circulating screening box; a circulating pipe is connected to the circulating screening box and used for being connected with a reaction kettle, the side wall of the pressurizing pipe is connected with a circulating pump through a feeding pipe, the circulating pump is connected with the reaction kettle through a pipeline, a material crushing mechanism is arranged at one end of the pressurizing pipe and comprises a movable column, a locking pipe and a hollow material crushing pipe, and one end of the movable column penetrates into the pressurizing pipe in a sliding mode. The hollow material crushing pipe rotatably penetrates through the movable column body, the hollow material crushing pipe is fixedly sleeved with a material crushing frustum, one end of the locking pipe penetrates through the hollow material crushing pipe to be connected with a material crushing cone, and a plurality of material locking nails slidably penetrate through the side wall of the material crushing cone, so that the precipitation content of ammonium phosphate crystals is higher, and the recovery rate of ammonium phosphate materials is improved.

Provided are electrolytes suitable for use in secondary cells, optionally lithium-ion secondary cells wherein the electrolytes provide excellent cycle life optionally in NMC based lithium-ion cells that are initially formed with a charge cutoff voltage of >4.3 V and subsequently cycled with a charge cutoff of ≤4.65 V during cell operation. The electrolyte optionally excludes ethylene carbonate and / or additives toxic to humans at the concentration used in the electrolyte.

The invention discloses a process method for producing battery-grade ammonium dihydrogen phosphate by using a solvent extraction method, which comprises the following steps: 1) respectively introducing industrial-grade refined phosphoric acid and liquid ammonia into a tubular reactor for primary reaction to obtain primary reaction slurry, introducing the primary reaction slurry into a neutralization reactor, and carrying out secondary reaction to obtain secondary reaction slurry; carrying out secondary reaction with circulating liquid ammonia in the neutralization reactor to obtain secondary reaction slurry; (2) the crystallizer is communicated with a thickener through a pipeline, a slurry outlet of the thickener is communicated with a first centrifugal machine and a second centrifugal machine through pipelines, discharging is conducted when the solid content of slurry in the thickener is 25-40%, and the first centrifugal machine and the second centrifugal machine are communicated with a drying fluidized bed conveying belt; and (3) the dried materials enter a plate cooler to be cooled for 20-40 minutes and then are cooled to 35 DEG C or below, a dehumidifier is arranged in the environment where the plate cooler is located, the dew point temperature of the dehumidifier is controlled within 15 DEG C, and the air pressure of the dehumidifier is larger than 7 KPa. The indexes of the battery grade ammonium dihydrogen phosphate product obtained by the method meet the requirements of the main quality index (GB / T 5742-2020) of ammonium dihydrogen phosphate for batteries.

Provided are a method of recovering phosphoric acid in the form of ammonium phosphate or a hydrate thereof from a fermentation broth or a waste liquid thereof, and / or a method of reusing the recovered phosphoric acid in fermentation.

A method for producing pure phosphate comprises providing (S10) a reextraction solution carrying a reextracted phosphate from a feed liquid comprising phosphoric acid contaminated with a heavy metal and iron, the reextraction solution being an aqueous solution of one of monoammonium phosphate and monopotassium phosphate. A base is added (S20) to the separated reextraction solution, raising the pH to 2-5.5, forming a heated solution and causing precipitation of a compound comprising iron and phosphate. And adding (S30) a precipitating agent for precipitating heavy metals. Separating (S40) the precipitated compound comprising iron and phosphate and the precipitated heavy metal compound. Thereafter, the heated filtered solution is cooled (S50) into a cooled solution, causing precipitation of the phosphate compound. The precipitated phosphate compound is removed from the cooled solution (S60). The cooled solution is recycled (S70) for use as an input back extraction solution in the back extraction operation. A system for producing pure phosphates is also disclosed.

The present invention provides a method for preparing crystalline ammonium polyphosphate type II with a layered structure and its application. The method includes: S1: Add phosphorus pentoxide and diammonium hydrogen phosphate, stir evenly, then introduce ammonia. The ammonia introduction amount is in a ratio with the reactants, and the ammonia introduction amount per 100 kg of reactants is 0.5 - 2 m³ / h. Heat and react for 1 h - 3 h, then stop introducing ammonia; S2: Open the vacuum, stir the product obtained in step S1, and spray and add an aqueous urea solution preheated to 65°C - 70°C within 0.5 h - 2 h. After adding, continue to stir for 10 minutes - 20 minutes, and then close the vacuum; S3: Stir, introduce preheated ammonia gas at 120°C - 150°C, and the ammonia introduction amount is in a ratio with the reactants, and the ammonia introduction amount per 100 kg of reactants is 1 m³ / h - 6 m³ / h. Heat and react; S4: Stop heating and stir, introduce un-preheated ammonia gas, and the ammonia introduction amount is in a ratio with the reactants, and the ammonia introduction amount per 100 kg of reactants is 0.5 m³ / h - 2 m³ / h. When the material temperature drops below 150°C, discharge, cool, and pulverize to obtain crystalline ammonium polyphosphate type II with a layered structure.

The present disclosure is generally directed to methods for forming anhydrous rare earth and actinide phosphate minerals. In some embodiments of the present disclosure, the method generally comprises subjecting rare earth or actinide phosphates or salts thereof to microwave radiation.

Provided herein are systems and methods for producing nitrophosphates and mineralized carbon. Advantageously, the systems and methods are capable of sequestering carbon from the atmosphere. The systems generally include a first reactor for producing nitric acid; a mixer for mixing the nitric acid produced in the first reactor with a phosphate source, thereby producing nitro-phosphoric acid; and a second reactor for producing a solution comprising nitrophosphates and mineralized carbon, wherein the second reactor is operable to receive: the nitro-phosphoric acid from the mixer, ammonia, water, and carbon dioxide.

A method can include: processing precursors, electrochemically oxidizing an anolyte and reducing a catholyte in an electrolyzer, and cooperatively using the oxidized anolyte and reduced catholyte in a downstream process. The electrolyzer can include an anode, a cathode, and a separator. The anode can include an anolyte, an electrode, an anolyte reaction region. The cathode can include a catholyte, an electrode, a catholyte reaction region.