27results about "Sulfate preparation" patented technology

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

The invention discloses a comprehensive recovery method and system for multiple components in chemical polishing waste liquid, the chemical polishing waste liquid is obtained by mixing chemical polishing tank liquid and rinse water after chemical polishing so as to adjust the proportion of the chemical polishing waste liquid, and the method further comprises the following steps: carrying out microfiltration treatment on the chemical polishing waste liquid to remove impurities so as to obtain chemical polishing filtrate; carrying out nanofiltration treatment on the chemical throwing filtrate to obtain a percolation acid solution containing phosphoric acid and a concentrated salt solution containing aluminum ions; extracting free phosphoric acid in the concentrated salt solution through acid retardant resin to obtain an aluminum salt solution used for extracting water agent raw materials; and mixing the free phosphoric acid with the percolation acid liquor, and carrying out evaporation and concentration treatment to obtain recovered phosphoric acid. The specific gravity of the waste liquid is adjusted by mixing the chemical polishing tank liquid and the rinsing water, and zero discharge of the waste liquid is realized, phosphoric acid and aluminum salt are efficiently recycled, energy consumption and cost are reduced, environmental pollution is reduced, and the resource utilization rate and economic benefits are improved through microfiltration, nanofiltration, acid retardation resin and evaporation concentration treatment.

The invention discloses an anion-cation synergistic sulfate sodium battery positive electrode material, a preparation method and a sodium ion battery. The anion-cation synergistic sulfate sodium battery positive electrode material is prepared by compounding a sulfate material and a layered oxide material, the general formula of the cation and anion synergistic sulfate sodium battery positive electrode material is Na6LxFey (SO4) 3 + y (MO4) z, wherein 0 < x < = 0.6, 3 < = y < = 5, and 0 < z < = 0.2; l is a cation alkali metal element with the same chemical valence as Na, L is at least one element of Li, K and Rb, and M is at least one element of Si and P. According to the material disclosed by the invention, the characteristics of low cost, high magnification, long circulation and high capacity of a sulfate material are realized through the synergistic effect of anions and cations, and the material has excellent magnification and cycle performance at high and low temperatures, so that the prepared sodium-ion battery has relatively high gram volume and excellent magnification and cycle performance; the application range of the sulfate series sodium electric material in a wide temperature range is greatly expanded.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

A dehumidification method of a moisture-absorbing sulfate-based positive electrode material comprises the following steps: uniformly mixing the moisture-absorbing sulfate-based positive electrode material with a gas-making agent, carrying out heat treatment in an inert atmosphere, and cooling to room temperature along with a furnace to obtain the dehumidified sulfate-based positive electrode material. The method is good in dehumidification effect, simple in process, high in feasibility, low in cost and suitable for industrial application, the obtained dehumidified sulfate-based positive electrode material and a sulfate-based positive electrode material before moisture absorption are consistent in crystal and stable in crystal structure, and an assembled battery is high in specific discharge capacity and stable in cycle performance.

A recycling method based on lithium-ion battery powder includes the following steps: pulping the lithium-ion battery powder to obtain a slurry; mixing sulfuric acid, a reducing agent, and the slurry, followed by a first-stage leaching and filtration operation to obtain a first leachate and a first leaching residue; subjecting the first leachate to P2O4 extraction to remove impurities, obtaining a battery-grade nickel-cobalt-manganese solution; mixing the sulfuric acid, the reducing agent, and the first leaching residue, followed by a second-stage leaching and filtration operation to obtain a second leachate and a second leaching residue; subjecting the second leachate to impurity removal filtration to obtain a filtrate and a filter residue; and subjecting the second leaching residue to high-acid leaching and filtration to obtain battery-grade graphite raw material; wherein the pH value in the first-stage leaching and filtration operation is 4-6; and the pH value in the second-stage leaching and filtration operation is 1-2.

The present invention relates to amorphous silica comprising particles of amorphous silica with a D50 of from 5 µm to 30 µm. The present invention also relates to a method of producing amorphous silica and metal salts, the method comprising mixing olivine, water and acid in a first vessel and reacting the olivine with the acid to produce amorphous silica.

A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.

The present invention discloses an activated carbon and its impurity removal method and application in the preparation of electronic grade sulfate. The impurity removal method of activated carbon provided by the present invention comprises the following steps: S1, primary cleaning: using dilute sulfuric acid to clean the activated carbon raw material and soaking for 20 to 30 hours to obtain primary activated carbon; S2, secondary cleaning: using ultrapure water to clean the primary activated carbon to obtain secondary activated carbon and water washing liquid, the conductivity of the water washing liquid is ≤10μS; S3, tertiary cleaning: using sulfate solution to clean the secondary activated carbon to obtain activated carbon and sulfate washing liquid after impurity removal, the difference between the total content of metal impurities in the sulfate washing liquid and the total content of metal impurities in the sulfate solution is ≤30μg / L. The present invention uses a three-stage cleaning method to remove impurities from the activated carbon raw material, and the total content of metal impurities in the activated carbon after impurity removal is low. It has a good effect when used in the preparation process of electronic grade sulfate, especially can achieve a good TOC removal effect.

The utility model discloses a reaction kettle capable of continuously operating. The reaction kettle comprises a reaction kettle body provided with an inner cavity and refrigeration cycle equipment, a stirrer and a baffle plate assembly are arranged in the inner cavity; a mother liquid input pipe, a circulating liquid input pipe, a circulating liquid outlet and an overflow port which are communicated with the inner cavity are arranged on the side wall of the reaction kettle body; the mother liquor input pipe is connected with external mother liquor supply equipment, the circulating liquid input pipe is connected with the output end of the refrigeration circulating equipment, and the circulating liquid outlet is connected with the input end of the refrigeration circulating equipment. According to the continuous cooling crystallization reaction kettle, the technical problems of low efficiency, poor quality control and high energy consumption of the existing reaction kettle in an intermittent cooling crystallization process are solved, and the technical effect that the reaction kettle is adaptive to a continuous cooling crystallization process is achieved.

A process for battery chemical production, where a sodium sulfate stream is treated with an ion exchange process to provide potassium sulfate and sodium chloride. The sodium chloride may be treated with a chlor-alkali to produce sodium hydroxide for use upstream in the battery chemical production process.

The invention belongs to the technical field of waste sulfuric acid resource utilization, and provides a treatment process for preparing microporous carbon from waste sulfuric acid, the waste sulfuric acid is alkylated waste sulfuric acid or waste sulfuric acid containing long-chain structure C8 or above organic matters, and the treatment process comprises the following steps: S1, a hydrated precipitated carbon reaction stage; s2, an aging microporous carbon reaction stage; s3, a separation stage: mixing the solid material generated in S2 with clear water in proportion, washing and separating to obtain microporous carbon A and purified acid; and S4, tail gas treatment. The waste sulfuric acid with high organic matter content is used for preparing the microporous carbon and the purified acid, the purified acid can be used for preparing sulfate, tail gas is reasonably treated, particularly, the microporous carbon can be used as a fuel and an adsorbent of the organic matter, complex and high-cost equipment investment and raw material investment are not needed, and the cost is low. Reduction, recycling and energy reduction of resources can be realized, and products with high additional values can be obtained.

Described herein is a process for the production of potassium sulfate and ammonium sulfate from syngenite. Specifically, the syngenite is produced from waste liquors and low value minerals and is used to produce valuable secondary products. Specifically, instead of performing the decomposition reaction in one step at high temperature, this process performs the reaction in 2 steps at temperatures lower than the decomposition temperature of ammonium bicarbonate: a first step to reach the equilibrium and produce saturated potassium sulfate brine, and a second step to complete the syngenite decomposition reaction.

The invention discloses a preparation method of iron phosphate, and relates to the technical field of lithium ion batteries. According to the method, an electrochemical double-replacement process is adopted, a ferric sulfate solution, a phosphoric acid solution or a phosphate solution is taken as a main raw material, the ferric phosphate mother liquor is prepared through an electrochemical double-replacement system, and meanwhile, sulfuric acid or sulfate is byproduct. Compared with a traditional iron phosphate synthesis system, a complex synthesis reaction kettle system can be reduced, and the influence of sodium ions or ammonia radical ions introduced by a sodium method or an ammonia method on an iron phosphate product is reduced; through an electrochemical double-replacement reaction, kinetic energy driving is provided through electric energy in the system, iron ions and phosphate ions are enriched for synthesis, an iron phosphate product is produced, economic benefits are produced, the amount of wastewater generated in the process is small, and the purpose of green production can be achieved.

The invention provides a separation and purification method and system for a deuterated formic acid electrolyte. The method comprises the following steps: performing cation exchange on a deuterated formic acid electrolyte to obtain a deuterated formic acid heavy water solution containing deuterated sulfuric acid; carrying out atmospheric distillation on the deuterated formic acid heavy water solution containing deuterated sulfuric acid to respectively obtain a dilute deuterated formic acid heavy water solution and deuterated sulfuric acid; carrying out pressurized rectification on the dilute deuterated formic acid heavy water solution to respectively obtain heavy water and primary purified deuterated formic acid; and carrying out reduced pressure rectification on the primary purified deuterated formic acid to respectively obtain secondary purified deuterated formic acid and a deuterated formic acid-heavy water mixed solution. According to the separation and purification method of the deuterated formic acid electrolyte, deuterated formic acid can be purified from the deuterated formic acid electrolyte, heavy water, deuterated sulfuric acid and deuterated sulfate in the deuterated formic acid electrolyte can be recycled, and the economical efficiency of the method is improved.

This electrode contains a compound which contains Li, at least one element selected from among Group 3 to Group 15 elements, and S, wherein a peak intensity Ra of SO3- and a peak intensity Rb of SO4- obtained by negative ion analysis through time-of-flight secondary ion mass spectrometry satisfy Ra>Rb.

A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

The present invention relates to a sodium iron sulfate material and a preparation method and application thereof, belonging to the field of energy storage technology. The sodium iron sulfate material provided by the present invention comprises a sodium iron sulfate crystalline phase, and at least a portion of the surface of the sodium iron sulfate crystalline phase is coated with a sodium iron sulfate amorphous phase. The present invention coats at least a portion of the surface of the sodium iron sulfate crystalline phase with a highly stable sodium iron sulfate amorphous phase, effectively isolating the contact between the internal sodium iron sulfate crystalline phase particles and the air, and improving the air stability of the sodium iron sulfate material; and the amorphous amorphous phase provides abundant vacancy defects, making metal migration easier than in the crystalline phase, thereby promoting electrode kinetics. The sodium iron sulfate material provided by the present invention has good air stability, rate performance and long cycle performance. The material can be left in the air for a long time, and the electrochemical performance after being left for 12 months has no obvious decline. The material can be used to prepare a high-performance sodium ion battery.

The present invention relates to amorphous silica comprising particles of amorphous silica with a D50 of from 1 µm to 30 µm (or from 5 µm to 30 µm). The present invention also relates to a method of producing amorphous silica and metal salts, the method comprising mixing olivine, water and acid in a first vessel and reacting the olivine with the acid to produce amorphous silica.

The invention relates to a dehumidification method and application of a moisture-absorbing sulfate-based positive electrode material, which comprises the following steps: uniformly mixing the moisture-absorbing sulfate-based positive electrode material with a gas-making agent, carrying out heat treatment in an inert atmosphere, and cooling to room temperature along with a furnace to obtain the dehumidified sulfate-based positive electrode material. A positive pole piece prepared from the dehumidified sulfate-based positive pole material obtained by the dehumidification method is used for assembling button-type, cylindrical, square or soft-package sodium ion batteries. The method is good in dehumidification effect, simple in process, high in feasibility, low in cost and suitable for industrial application, the obtained dehumidified sulfate-based positive electrode material and a sulfate-based positive electrode material before moisture absorption are consistent in crystal and stable in crystal structure, and an assembled battery is high in specific discharge capacity and stable in cycle performance.

This electrode comprises a compound that includes Li, one or more elements selected from Group 3–15 elements, and S. The peak intensity Ra of SO3 - and the peak intensity Rb of SO4 -, which are obtained through negative ion analysis by a time-of-flight secondary ion mass spectrometry, satisfy the relationship Ra > Rb.

The electrode contains a compound that contains Li, one or more elements selected from the group consisting of Group 3 to Group 15 elements, and S, and in which the peak intensity Ra of SO3-and the peak intensity Rb of SO4-as obtained by anion analysis by time-of-flight secondary ion mass spectrometry satisfy Ra > Rb.

This application discloses a nanoparticle, a thin film, an optoelectronic device, and an electronic device. The nanoparticle includes a core and a shell coating the surface of the core. The core is made of a metal oxide, and the shell is made of a first compound with the general formula A. x (SO4) y (OH) 3x‑2y A is the first metallic element, 1≤x≤4, 1≤y≤5, where x and y are integers, decimals, or fractions, respectively. The nanoparticles have good solution processing properties and performance stability, and can be used as materials for preparing optoelectronic devices.

A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.

The invention relates to a process method for zero discharge treatment of acrylonitrile flue gas desulfurization wastewater. The process method comprises a pretreatment section, a main reaction section and a deep treatment section, the pretreatment section comprises a molybdenum removal unit, an adjusting hardness removal unit, a tubular microfiltration unit and a sludge thickening, dewatering and drying unit; the main reaction section comprises an electrodialysis unit, a primary anaerobic unit, a secondary anaerobic unit, an incineration boiler unit, a flue gas desulfurization unit, a multi-effect evaporation unit and a crystallization and salt separation system; the deep treatment section comprises a Fenton oxidation unit, a nanofiltration unit and a neutralization unit; the electrodialysis unit adopts a polydopamine modified anion exchange membrane; the improved electrodialysis realizes the separation of organic matters and salt and the concentration of the salt, so that the anti-pollution capability is greatly improved, the subsequent anaerobic treatment is facilitated, and the content of the organic matters in the salt separation section is also reduced; in the whole process method, waste water is recycled, waste gas can be used as fuel, salt is converted into sodium sulfate and sodium chloride products, and water, gas and solid are integrally recycled.

The present disclosure relates to integrated systems and processes to produce lithium products, including battery grade lithium carbonate and lithium hydroxide.