47results about "Sodium/potassium compounds" patented technology

The invention discloses a preparation method of sodium fluorosulfate, which comprises the following steps: mixing sodium pyrosulfate and ammonium fluoride in an aprotic polar solvent, and reacting at 50-200 DEG C to generate sodium fluorosulfate; after the reaction is finished, separating to obtain a solution containing sodium fluorosulfate; concentrating the solution, and adding an anti-solvent to induce sodium fluorosulfate crystallization; and separating to obtain sodium fluorosulfate. According to the invention, safe and easily available ammonium fluoride and sodium pyrosulfate are adopted as raw materials, one-step reaction is carried out in a mild aprotic polar solvent system, and an anti-solvent crystallization process is combined, so that efficient preparation of sodium fluorosulfate with high purity, low acid value and no chloride ion residue is successfully realized; and the problems of dependence on high-risk raw materials and serious pollution of byproducts in the prior art are solved.

The present invention relates to a process for producing salts from brine obtained from the desalination of seawater. The process can also make it possible to selectively recover NaCl, CaSO4, kainite, carnallite, magnesium sulfate, struvite, newberyite, or potassium bitartrate.

A sodium supplement material, a preparation method thereof, positive electrode plate, and sodium-ion battery. The sodium supplement material includes a sodium supplement agent body and first particles exposed on the surface of the sodium supplement agent body. In any 300 nm×200 nm region on the surface of the sodium supplement material, the number of first particles ranges from 2 to 20. The first particles include one or more conductive agent particles and one or more catalyst particles.

A sodium supplementing material, a preparation method therefor, a positive electrode plate, and a sodium-ion battery. The sodium supplementing material comprises a sodium supplementing agent body, and first particles exposed on the surface of the sodium supplementing agent body. In any 300 nm x 200 nm region of the surface of the sodium supplementing material, there are 2-20 first particles, and the first particles comprise conductive agent particles and catalyst particles.

A method for generating / synthesising a metal hexafluorophosphate is disclosed which comprises dissolving ammonium hexafluorophosphate in tetrahydrofuran (THF) solvent, and flowing the resulting dissol

This invention belongs to the field of fly ash treatment technology, specifically disclosing a method for separating potassium and sodium from fly ash, including the following steps: adjusting the acid concentration in the fly ash washing solution to 40-65% and the temperature to 40-65℃, adding a sodium precipitating agent and maintaining the reaction temperature, and filtering to obtain sodium salt and potassium-containing waste liquid. This invention utilizes precipitation to recover sodium ions from fly ash washing solution. After filtration, sodium salt precipitate and potassium-containing waste liquid are obtained. During this process, the reaction is controlled under acidic conditions to prevent potassium ion precipitation. At 40-60℃, the sodium precipitating agent reacts with sodium ions to obtain sodium salt precipitate with large crystals, which allows for more convenient and thorough filtration, resulting in better separation of potassium and sodium ions in the fly ash washing solution. The sodium salt precipitate is further washed with a displacement agent to replace the potassium ions attached to the surface of the sodium salt precipitate with sodium, improving the purity of the sodium salt product. Finally, multiple water washings are performed to reduce the acidity of the sodium salt precipitate, resulting in a sodium salt product with stable quality.

The present disclosure provides a sodium supplement material, its preparation method, positive eletrode plate, and sodium-ion battery. The sodium supplement material includes a sodium supplement agent body and first particles exposed on the surface of the sodium supplement agent body. In any 300 nm × 200 nm region on the surface of the sodium supplement material, the number of first particles ranges from 2 to 20. The first particles include one or more conductive agent particles and one or more catalyst particles.

The invention relates to a process for recovering an electrolyte and co-producing potassium hexafluorophosphate, which comprises the following steps: 1) taking the electrolyte, adding potassium fluoride and potassium carbonate solid, stirring for 0.5-1.5 hours at room temperature, and then stirring for 4-6 hours at 40-50 DEG C; 2) after stirring is finished, carrying out solid-liquid separation, and recovering the solvent from the obtained filtrate in a rectification manner; 3) performing solid-liquid separation to obtain a solid, adding acetonitrile, and stirring at 20-25 DEG C for 30-60 minutes; 4) after stirring, filtering and washing to obtain a lithium fluoride solid; and carrying out rotary evaporation on the obtained filtrate at 60-70 DEG C to obtain a crude potassium hexafluorophosphate solid. According to the process, a step-by-step extraction and hydrolysis process route is adopted, operation is easy, industrial production is easy to achieve, energy consumption and cost are reduced, and the potassium hexafluorophosphate solid is produced while the electrolyte is recycled; and guidance is provided for electrolyte recovery and potassium hexafluorophosphate synthesis in the future.

This invention relates to the field of sodium hexafluorophosphate production, and particularly to a sodium hexafluorophosphate production apparatus, comprising a base plate and tanks. Several support columns are arranged at the upper end of the base plate, and three tanks are arranged at equal intervals above the support columns. Adjacent tanks are connected by several arc-shaped support plates. A stirring unit for preliminary mixing of chemical agents is installed in the lower tank. This invention uses a storage unit to store and preliminarily stir hydrogen fluoride and tetrapolyphosphoric acid raw materials. The mixed raw materials are then pumped to the lower tank via a water pump, where the stirring unit further stirs the raw materials. The preliminarily mixed raw materials are then transferred to the middle tank via a transfer assembly and the stirring unit. A water temperature unit regulates the temperature inside the corresponding tank, ensuring thorough mixing of the raw materials.

Provided herein are compositions and methods of making compositions useful in the production of battery electrolyte precursors and battery electrolytes.

This disclosure relates to a process for preparing ultra-high-purity alkali metal hexafluorophosphate (MPF6), comprising the steps of: (a) filling a first reactor "B" with alkali metal fluoride (MF) and flowing nitrogen gas through the first reactor "B"; (b) cooling the first reactor "B" to a predetermined temperature, then filling it with anhydrous hydrogen fluoride (AHF) gas and stirring the mixture containing alkali metal fluoride (MF) dissolved in AHF within the first reactor "B"; (c) cooling the mixture containing alkali metal fluoride (MF) dissolved in AHF within the first reactor "B" to a predetermined temperature; and (d) filling a second reactor "A" with phosphorus pentachloride (PCl5) and adding AHF in lots to achieve high purity The present invention relates to a process comprising: (e) generating phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas; (f) reacting alkali metal fluoride (MF) dissolved in AHF in a first reactor "B" with the mixture of phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas obtained in step (d) to obtain an alkali metal hexafluorophosphate mother liquor dissolved in AHF under a PF5 gas atmosphere; and (f) cooling the first reactor "B" to a predetermined temperature, maintaining the temperature of the alkali metal hexafluorophosphate mother liquor dissolved in AHF for a predetermined time, followed by filtration and drying at a predetermined temperature to obtain an alkali metal hexafluorophosphate (MPF6) selected from NaPF6, KPF6, or CsPF6.

To provide a method for producing a positive electrode active material excellent in cycle characteristics.SOLUTION: A method for producing a positive electrode active material includes obtaining second particles containing a lithium transition metal composite oxide having a layered structure and a composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is 0.7 or more and less than 1 by bringing the first particles containing the lithium transition metal composite oxide into contact with a solution containing sodium ions, obtaining a mixture by mixing the second particles with a boron compound, and heat-treating the mixture at a temperature of 100 °C or higher and 450 °C or lower.SELECTED DRAWING: Figure 1

An aqueous coating composition for a separator in a secondary battery is provided. The coating composition includes: a) at least one polymeric binder, b) at least one alkali metal silicate, c) optionally, at least one alkali metal siliconate, and d) inorganic particles. A coated separator is also provided.

The invention provides fluoride fluorescent particles, fluoride fluorescent powder and a preparation method thereof, a light-emitting element and a light-emitting device, and belongs to the technical field of fluorescent powder and light-emitting devices. The chemical formula of the fluoride fluorescent particle is Na2Si (1-X) F6: Mn4 + X, x is greater than 0 and less than 0.1, the fluoride fluorescent particle is of a polyhedral structure, and the polyhedral structure comprises an upper prismatic table, a lower prismatic table and prisms, the upper prismatic table and the lower prismatic table are symmetrically arranged, and the prisms are positioned between the upper prismatic table and the lower prismatic table and are respectively jointed with the lower bottom surface of the upper prismatic table and the lower bottom surface of the lower prismatic table. The fluorescent particle with the polyhedral structure has the characteristics of high emission intensity and high stability, and compared with a rod-shaped structure and an amorphous structure, the fluorescent particle with the polyhedral structure has the advantages that the contact area with water / water vapor after LED packaging is reduced, the dissociation speed is reduced, and the service life of an LED device is prolonged.

The present invention belongs to the field of environmental protection technology and specifically relates to a high-temperature, high-pressure steam extraction and dechlorination system for high-chloride waste. The system comprises a high-chloride waste pretreatment unit, a high-chloride waste transfer-extraction unit, and a low-chloride waste collection unit. The high-chloride waste transfer-extraction unit includes a first transfer assembly, a second transfer assembly, a steam extraction assembly, and an extrusion assembly. The first transfer assembly includes a first transfer filter cloth, the second transfer assembly includes a second transfer filter cloth, and the steam extraction assembly includes a high-temperature, high-pressure steam injection device. The system extracts chloride ions through high-temperature, high-pressure steam extraction, and then extrudes the chlorine-containing wastewater for centralized collection and discharge, thereby reducing the chlorine content in the high-chloride waste.

The application relates to a preparation method of a hexafluorophosphate, and belongs to the field of battery electrolytes. The preparation method comprises the following steps: carrying out an electrolysis reaction on anhydrous HF, phosphorus powder and an alkali metal fluoride salt to generate the hexafluorophosphate. The weak fluorine is electrolyzed from the anhydrous HF, and then the weak fluorine, the phosphorus powder and the alkali metal fluoride salt are reacted to directly synthesize the hexafluorophosphate by one-pot method, so that the yield is higher and the operation is simple. Compared with the reaction of fluorine gas and elemental phosphorus, the reaction of the weak fluorine obtained by the electrolysis method and the phosphorus powder is more moderate, easy to control and high in safety.

This invention belongs to the field of solid electrolyte materials technology, and particularly relates to a Ca / Sr / Ba doped modified sodium-rich anti-perovskite solid electrolyte material and method. The material uses sodium-rich anti-perovskite Na3SI as a matrix, and is obtained by doping with at least one metal atom selected from Ca, Sr, and Ba to replace some of the Na atoms in the matrix. The crystal structure of the material belongs to the Pm-3m space group, with lattice parameters satisfying a=b=c=10.0-11.0 Å, α=β=γ=90°, formation energy ≤-1.14 eV, band gap of 3.27-3.40 eV, and room temperature ionic conductivity.

The application provides a method for preparing sodium hexafluorophosphate for sodium batteries from sodium bifluoride, which comprises the following steps: taking electronic-grade sodium hydroxide and electronic-grade hydrofluoric acid as raw materials to generate an intermediate product sodium fluoride, and then reacting the intermediate product with phosphorus pentafluoride to obtain high-purity sodium hexafluorophosphate for sodium batteries. The particle size distribution and yield of sodium fluoride crystals are controlled by adjusting the stirring rate and cooling conditions, and then the purity and yield of sodium hexafluorophosphate are controlled, so that the purity of the finally obtained sodium hexafluorophosphate can reach more than 99.8%, the yield can reach more than 85%, the sodium hexafluorophosphate has the advantages of low cost and high yield, and is beneficial to industrialized production.

The present disclosure relates to a process for the preparation of ultra high purity alkali metal hexafluorophosphate (MPF6) comprising the steps of (a) charging alkali metal fluoride (MF) into a first reactor 'B' and flushing the first reactor 'B' with nitrogen, (b) cooling the first reactor 'B' to a predetermined temperature, the method comprises the following steps: (a) dissolving an alkali metal fluoride (MF) into a first reactor 'A', then charging anhydrous hydrogen fluoride (AHF) gas into a first reactor 'B' and stirring the mixture comprising the alkali metal fluoride (MF) dissolved in the AHF, (c) cooling the mixture comprising the alkali metal fluoride (MF) dissolved in the AHF in the first reactor 'B' to a predetermined temperature, (d) charging phosphorus pentachloride (PCl5) into a second reactor 'A' and adding the AHF in batches, the invention relates to a method for producing phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas, (e) reacting alkali metal fluoride (MF) dissolved in AHF in a first reactor 'B' with a mixture of phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas obtained in step (d) to obtain an alkali metal hexafluorophosphate mother liquor dissolved in AHF under the coverage of PF5 gas, (f) cooling the first reactor 'B' to a predetermined temperature, and (f) separating the alkali metal hexafluorophosphate mother liquor from the first reactor 'B' to obtain the phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas. The present invention relates to a method for preparing an alkali metal hexafluorophosphate (MPF6), characterized in that the alkali metal hexafluorophosphate (MPF6), selected from NaPF6 or KPF6 or CsPF6, is dissolved in AHF, and the alkali metal hexafluorophosphate mother liquor dissolved in AHF is maintained at said temperature for a predetermined time, followed by filtration and drying at a predetermined temperature, to obtain the alkali metal hexafluorophosphate (MPF6) selected from the group consisting of NaPF6 or KPF6 or CsPF6.

The present invention relates to a process for preparing potassium bitartrate by treating a brine typically containing NaCl, KCl, CaSO4 and / or MgSO4 salts.

The invention provides a method for recovering waste acid and waste salt in chlorine drug intermediate production wastewater, and belongs to the technical field of industrial wastewater treatment. The method comprises the following steps: adsorbing homogenized production wastewater by macroporous resin in an adsorption column to remove residual organic phases in the production wastewater so as to obtain inorganic waste liquid; inorganic waste liquid enters a chromatographic column, and free acid is adsorbed by an adsorption filler to obtain high-salt waste liquid; eluting with the chromatographic column, and recovering concentrated acid; the high-salt waste liquid meeting the expected pH value enters a multi-effect evaporation system to be subjected to evaporative crystallization, and sodium salt crystals are recycled respectively; the multi-effect evaporation system at least adopts a triple-effect parallel-flow feeding evaporation system, and the temperature adopted for evaporation in the material liquid flowing direction is gradually reduced; the macroporous resin adopts chloromethylated resin; the adsorption filler is a microsphere filler of which the surface is crosslinked with a biquaternary ammonium salt group. The waste acid and the waste salt in the chlorine drug intermediate production wastewater are efficiently recovered by adopting a mode of adsorbing an organic phase, separating free acid by a chromatographic column and performing multi-effect parallel flow feeding evaporative crystallization.

The invention aims to provide a method for improving the reversible press-clamping effect of plastic crystal materials under a low driving field by controlling the granularity. The plastic crystal materials with different particle sizes are prepared by mechanical grinding. Specifically, the particle size of the plastic crystal material is controlled through a sieve, the plastic crystal material is subjected to cold press molding through a hydraulic machine and a mold, and therefore the plastic crystal material with the low phase change thermal hysteresis and the large reversible piezocaloric effect is prepared, and the reversible piezocaloric effect of the plastic crystal material under the low driving field is effectively improved through the method.

According to one aspect of the present disclosure, a method of producing purified silicon comprises providing an alkali or alkaline earth metal and a metallic or aminated halide salt of silicon; combining the alkali or alkaline earth metal and metallic or aminated halide salt of silicon in a liquid medium to form a precipitate; combining the precipitate with sulfuric acid or another acid to form a byproduct and silicon; and recovering the purified silicon. In some embodiments, the liquid medium is an amine or ammonia. In some embodiments, the alkali or alkaline earth metal and metallic or aminated halide salt of silicon are combined at a low temperature such that the amine or ammonia are in a liquid phase.

This application discloses a capacity compensation additive and a method for preparing the same, a positive electrode sheet, a battery, and a power consumption device, wherein the capacity compensation additive comprises a capacity compensating agent and a catalyst-containing carbon material, and the catalyst-containing carbon material is coated on at least a portion of the surface of the capacity compensating agent.

To provide a method of producing a positive electrode active material with good cycle characteristics.SOLUTION: A method of producing a positive electrode active material includes: bringing first particles that contain a lithium transition metal composite oxide into contact with a solution containing sodium ions to obtain second particles containing the lithium transition metal composite oxide and sodium elements, the lithium transition metal composite oxide having a layered structure and having a composition ratio of a number of moles of nickel to a total number of moles of metals other than lithium in a range of from 0.7 or more to less than 1; mixing the second particles and a boron compound to obtain a mixture; and heat-treating the mixture at a temperature in a range of from 100°C or more to 450°C or less.SELECTED DRAWING: Figure 1

A process for the chemical insertion of cations of an alkali metal into a solid compound of formula (I): A1-x1MmTO4, in which: A is chosen from lithium (Li) and sodium (Na), M is chosen from manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), magnesium (Mg) and mixtures thereof, T is chosen from phosphorus (P), arsenic (As) and mixtures thereof, 0 < x1 ≤ 1, and m = 1, the process comprising at least one step, called step (a), of bringing the solid compound of formula (I) into contact in an aqueous solution with a reducing agent and a source of cations of the alkali metal, whereby a solid compound of formula (II) is obtained: A1-x2MmTO4, in which: A, M, T and m are as defined above, 0 ≤ x2 < 1, and x2 < x1.

Disclosed in the present disclosure are a method for preparing sodium hexafluorophosphate, and a sodium-ion battery electrolyte. The method for preparing sodium hexafluorophosphate comprises: adding sodium fluoride into an organic solvent, and introducing phosphorus pentafluoride to cause the phosphorus pentafluoride to react with the sodium fluoride; filtering the reaction product to obtain a filtrate; evaporating and concentrating the filtrate at a first temperature so that a mass content of the sodium hexafluorophosphate in the filtrate is 20% to 60%; crystallizing and filtering the evaporated and concentrated filtrate at a second temperature to obtain a filter cake and a sodium hexafluorophosphate concentrate product, wherein the second temperature is lower than the first temperature; and drying the filter cake to obtain a sodium hexafluorophosphate solid product.

This invention discloses a continuous refining apparatus for sodium hexafluorophosphate, including a precooler. The precooler is sequentially connected to at least one refining unit, a buffer unit, and a solid-liquid separation unit. The liquid outlet of each refining unit is connected to the feed inlet via a heat exchanger, and the liquid outlet of the solid-liquid separation unit is connected to the feed inlet of the final refining unit. The invention also relates to a continuous refining apparatus and method for sodium hexafluorophosphate. The sodium hexafluorophosphate raw material liquid obtained from reaction synthesis is cooled by the precooler and then injected into the first-stage refining unit. The temperature inside the refining unit is controlled, and the slurry is continuously discharged from the outlet of the first-stage refining unit and sequentially injected into the buffer unit and the solid-liquid separation unit. Simultaneously, the mother liquor from each refining unit is cooled by the heat exchanger and then enters the feed inlet. The solid discharged from the solid-liquid separation unit is collected to obtain sodium hexafluorophosphate crystals, and the mother liquor discharged from the solid-liquid separation unit is returned to the final refining unit. This method can improve the quality of sodium hexafluorophosphate products.

Provided herein are compositions and methods of manufacturing compositions useful in producing battery electrolyte precursors and battery electrolytes.

The application belongs to the technical field of sodium hexafluorophosphate and particularly relates to a one-pot preparation process of sodium hexafluorophosphate. The one-pot preparation process of sodium hexafluorophosphate comprises the following steps: (1) reaction: anhydrous hydrogen fluoride is put into a reactor, a sodium source and a phosphorus source are sequentially added at a temperature of -60 to -20 DEG C, then the temperature is increased to 0 to 10 DEG C for reaction, volatile substances are evaporated after the reaction is completed, and a sodium hexafluorophosphate primary product is obtained; (2) neutralization: an organic solvent is added to the sodium hexafluorophosphate primary product for dissolution, then an alkaline substance is added to adjust the pH value of the solution system to 7 to 9, filtration is performed, a sodium hexafluorophosphate solution is obtained, the organic solvent is evaporated by increasing the temperature, and a sodium hexafluorophosphate crude product is obtained after drying. The one-pot preparation process has the advantages of mild conditions, simple operation, fast reaction rate, easy separation of the product, high purity and high yield of the prepared sodium hexafluorophosphate crude product, and is suitable for industrial production.