247results about "Alkali metal fluorides" patented technology

The invention relates to a comprehensive utilization method of fluosilicic acid containing hydrogen fluoride, which comprises the following steps: 1) reacting a stock solution containing fluosilicic acid with a potassium fluoride raw material, and carrying out solid-liquid separation to obtain potassium fluosilicate and a hydrofluoric acid solution; 2) reacting potassium fluosilicate with a sodium hydroxide raw material, and carrying out solid-liquid separation to obtain a mixture of a potassium fluoride solution, sodium fluoride and silicon dioxide; and returning the potassium fluoride solution to the step 1) to be recycled as a potassium fluoride raw material. According to the scheme, hydrofluoric acid is prepared from fluosilicic acid containing hydrogen fluoride, sodium fluoride and water glass products are produced at the same time, no other byproduct waste is produced, and the raw material utilization rate is high. And meanwhile, the method has the advantages of low raw material cost, low equipment cost and low energy consumption cost, can generate remarkable economic benefits, and is suitable for popularization and application.

To provide a fluorinating agent that can be produced using a simple method, and a fluorination method that uses a fluorinating agent that can be produced using a simple method.SOLUTION: The present disclosure provides a fluorinating agent that comprises a fluorine-containing compound and fluoride ions.SELECTED DRAWING: None

The invention relates to an electrolytic fluorine-making nickel-containing waste electrolyte treatment method which comprises the following steps: heating a fluorine-making electrolytic cell to 80-95 DEG C, completely melting the electrolyte, standing for layering, and taking out the colorless electrolyte on the upper layer; excessive fluorine gas is introduced into the electrolytic cell, and ferrous ions in the remaining electrolyte are converted into iron ions; electrolyte in the electrolytic bath is guided into an anti-corrosion container, deionized water is added into the anti-corrosion container, and the electrolyte is completely dissolved; adjusting the pH value of the solution in the container to 3-4, fully precipitating, and carrying out solid-liquid separation to obtain a solid A and a filtrate A; adjusting the pH value of the filtrate A to 9-11, fully precipitating, and carrying out solid-liquid separation to obtain a solid B and a filtrate B; and adjusting the ion molar ratio of F <-> to K < + > in the filtrate B to be 2: 1, then carrying out evaporative crystallization, and drying obtained crystals to obtain products of potassium hydrogen difluoride and potassium fluoride. The waste electrolyte can be effectively treated, and resources are efficiently recycled and reutilized.

The invention relates to the field of waste polymer material recovery and resource utilization, and particularly discloses a method for realizing ultra-fast recovery of fluorine-containing organic waste through a self-propagating reaction. According to the method, liquid sodium-potassium alloy (NaK) is used as a reaction medium, under the protection of inert atmosphere, fluorine-containing organic solid waste is in contact with NaK, electron transfer is induced through mechanical friction, C-F bond breakage is catalyzed and induced, a defluorination reaction is triggered, reaction heat is released, a self-propagating combustion reaction is initiated, and finally, carbon materials and metal fluoride products are recycled. The method is rapid in reaction, does not need external heating, can efficiently recover fluorine-containing waste and prepare high-added-value materials, and is suitable for green large-scale treatment of waste fluoropolymers and preparation of functional materials.

The present application provides a method for comprehensive recycling of aluminum electrolysis waste cathode water leaching and pressurized purification, which relates to the field of solid waste recycling. The method comprises: mixing raw materials including aluminum electrolysis waste cathode, water and hydrogen peroxide, heating for water leaching, and then performing solid-liquid separation to obtain filtrate and water-leached material; mixing the water-leached material with concentrated sulfuric acid for a first high-pressure closed acid leaching, and performing solid-liquid separation on the reaction system to obtain filtrate residue; mixing the filtrate residue, concentrated sulfuric acid, concentrated hydrochloric acid, hydrogen peroxide solution and water, and performing a second high-pressure closed acid leaching, and performing solid-liquid separation on the reaction system to obtain artificial graphite. The method is simple to operate, has little corrosion to the equipment, and can not only obtain a graphite particle product with a fixed carbon content of more than 97%, but also recover the fluorine in the waste cathode in the form of hydrofluoric acid. On the basis of effectively solving the problem of fluoride pollution in the waste cathode, it also realizes the high-quality utilization of fluoride and graphite in the waste cathode.

The invention relates to the technical field of uranium hexafluoride recovery, in particular to a two-stage recovery uranium hexafluoride recovery system. The uranium hexafluoride recovery system comprises a carbon reactor, an inlet of which is connected with a feeding pipeline through an electromagnetic valve and an outlet of which is connected with a condensing device; the condensing device comprises a first outlet, a second outlet and at least one condenser, and the condenser is used for condensing uranium hexafluoride into a solid state or a liquid state; the first outlet is connected with a recovery pipeline, and the second outlet is connected with a tail gas treatment system; the recovery pipeline is provided with heating medium heat tracing and is used for heating the solid uranium hexafluoride in the recovery pipeline to be in a gas state or a liquid state; and the recovery container is arranged in the cooling container filled with the cooling medium and is used for cooling the uranium hexafluoride entering the recovery container into a solid state for storage. According to the uranium hexafluoride recovery system with the two-stage recovery function, uranium hexafluoride can be safely and efficiently recovered.

The invention provides lithium fluoride as well as a preparation method and application thereof. The mass content of carbonate in the lithium fluoride is less than or equal to 1000mg / kg; d10 of the lithium fluoride is smaller than or equal to 10 microns, D50 of the lithium fluoride is smaller than or equal to 20 microns, and the bulk density of the lithium fluoride is 0.9-1.2 g / cm < 3 >. The lithium fluoride provided by the invention has a specific size specification and relatively low carbonate impurity content, and the lithium fluoride is beneficial to preparation of electrolyte salt capable of improving the electrical performance of a battery.

The invention provides a manganese electrolysis anolyte purification and purification residue utilization method which comprises the following steps: adding sodium fluoride into a manganese electrolysis anolyte for precipitation and purification to obtain a purification solution and purification residues; adding a sodium hydroxide solution into the purified slag, and carrying out wet grinding alkali transfer to obtain alkali transfer slag and alkali transfer liquid; adding sulfuric acid into the alkali transfer slag for acid leaching to obtain magnesium sulfate and calcium sulfate slag; adding hydrofluoric acid into the alkali transfer solution for neutralization to obtain a neutralized solution; the neutralization liquid is subjected to evaporative crystallization, sodium fluoride is obtained, and the sodium fluoride is used for precipitation purification. According to the method, the manganese electrolysis anolyte is precipitated and purified through sodium fluoride to separate calcium and magnesium elements and manganese ions, then the calcium element and the magnesium element are separated through sodium hydroxide solution wet ball milling and sulfuric acid leaching, and the starting material sodium fluoride is recycled, so that waste liquid generated in the technological process is reduced, and the production cost is reduced. The cyclic utilization of resources is promoted, and the concept of green sustainable development is met.

The present invention relates to a method for co - processing and resource utilization of overhaul slag, fly ash, and desulfurized gypsum. The method comprises the following steps: Step 1) dehydrate and then dry the desulfurized gypsum, add calcium carbonate to the dried desulfurized gypsum, and collect SO3 gas; Step 2) carry out an autoclave reaction on the SO3 gas obtained in Step 1, water, and fly ash. After solid - liquid separation, silicon dioxide and an aluminum sulfate solution are obtained; Step 3) crush and ball - mill the overhaul slag, and carry out first - stage roasting with a peroxide at high temperature to obtain clinker 1; leach out sodium fluoride from clinker 1 by water immersion, and then add it to the aluminum sulfate for second - stage roasting to obtain clinker 2; Step 4) mix clinker 2 with water for leaching to obtain a filtrate and a filter residue; Step 5) calcine calcium oxide and the filter residue to obtain calcium aluminate. The beneficial effect of the present invention aims to synergistically utilize the sodium, aluminum, fluorine, and lithium elements, the aluminum and silicon elements of fly ash, and the calcium element in desulfurized gypsum to achieve the purpose of resource conversion.

A method for purifying sodium fluoride by using complexing crystallization belongs to the technical field of sodium fluoride purification, and comprises the following steps: preparing a dissolving solution; complexing the dissolving solution with a complexing agent to obtain a complexing solution; the complexing solution is pumped into membrane separators, the complexing solution passes through the first membrane separator, a mixed solution of complexing precipitation and a complexing agent is filtered and intercepted through a tube pass of the first membrane separator, and a filtrate enters other membrane separators through a shell pass of the first membrane separator to be subjected to multi-stage separation to obtain a membrane separation solution; performing pure crystallization on the membrane separation liquid; and centrifugally separating to obtain purified sodium fluoride, and drying the purified sodium fluoride to remove the residual solvent, thereby obtaining the high-purity sodium fluoride. According to the method, the content of cation impurities and the content of anion impurities in sodium fluoride are effectively reduced at the same time, high-purity sodium fluoride is obtained through a pure crystallization method, the centrifugal separation liquid, the complexing agent and the alcohol crystallizing agent can be recycled, and the purposes of high efficiency, environment friendliness and low cost of purification are achieved.

The invention belongs to the technical field of rare earth ore concentrate treatment, and particularly relates to a method for recycling fluorine, phosphorus and rare earth through mixed rare earth ore concentrate hydrochloric acid leaching and two-step alkaline decomposition. The method comprises the following steps: mixing hydrochloric acid and mixed rare earth concentrate, reacting and leaching to obtain acid leached mixed ore and an acidic rare earth chloride solution; uniformly stirring the acid-leached mixed ore and a sodium hydroxide solution A, heating for reaction, adding water for washing, filtering to obtain a first-step alkali cake and a first-step alkali liquor, and concentrating the first-step alkali liquor to obtain sodium fluoride; uniformly stirring the first-step alkali cake and a sodium hydroxide solution B, and treating to obtain a second-step alkali cake and a second-step alkali solution; treating the two-step alkali liquor to obtain trisodium phosphate dodecahydrate; and putting the two-step alkali cake into an acidic rare earth chloride solution, and treating to obtain rare earth chloride feed liquid. The method for recycling fluorine, phosphorus and rare earth through hydrochloric acid leaching and two-step alkaline decomposition of the mixed rare earth concentrate has the advantages of being low in production cost, small in three-waste generation amount, easy to operate and high in rare earth, fluorine and phosphorus recycling rate.

The invention discloses a clean production process for cyclic utilization of nickel-containing waste, which comprises the following steps: placing nitrogen trifluoride electrolysis nickel-containing waste residue in an electrothermal furnace, sublimating or decomposing ammonium bifluoride in the nickel-containing waste residue, condensing, liquefying and crystallizing through a condensing system to re-synthesize ammonium bifluoride for sale or reuse; the main components of the material a heated and volatilized by the electrothermal furnace are nickel fluoride, ferric fluoride and copper fluoride; adding the material a into an alkaline material solution for conversion leaching to obtain nickel hydroxide, ferric hydroxide and copper hydroxide, and converting a sodium hydroxide or potassium hydroxide solution into a sodium fluoride or potassium fluoride solution; adding an acid-carrying anolyte of a nickel electrolysis system into the obtained nickel hydroxide, ferric hydroxide and copper hydroxide slag, dissolving nickel hydroxide, ferric hydroxide and copper hydroxide into an electrolyte by using acid in the anolyte, removing metal impurities, and filtering to obtain a pure nickel electrolysis pre-solution; and electrolytic nickel with the nickel content larger than 99.96% of Ni is produced through insoluble anode electrolysis.

The invention provides a lithium bis (fluorosulfonyl) imide heavy slag treatment method which comprises the following steps: reacting bis (fluorosulfonyl) imide heavy slag to be treated with an aqueous solution of an alkaline compound to obtain a reaction solution containing a salt compound and ammonia gas; and recovering the reaction liquid to obtain the salt compound. By means of the method, resource recycling can be conducted on the lithium bis (fluorosulfonyl) imide heavy slag, economic benefits are improved, and the method has important significance in promoting sustainable development and circular economy.

The invention belongs to the technical field of sodium-ion battery positive electrode material preparation, and particularly discloses a double-modified sodium-ion battery layered oxide positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: S1, synthesizing a P2-type sodium-ion battery nickel-manganese-based layered oxide by using a high-temperature solid-phase method; s2, uniformly mixing two or more of lithium fluoride, sodium fluoride, calcium fluoride or magnesium fluoride in proportion to prepare a multi-element fluoride coating material; and S3, uniformly mixing the P2-type sodium-ion battery nickel-manganese-based layered oxide and the multi-fluoride coating material according to a ratio, and then carrying out high-temperature quenching treatment to obtain the surface fluoride-coated and near-bulk-phase-doped dual-modified sodium-ion battery layered oxide positive electrode material. According to the dual-modified layered oxide positive electrode material for the sodium-ion battery and the preparation method, surface fluoride coating and near bulk phase doping are cooperatively utilized, so that the high-voltage cycle performance of the layered oxide positive electrode material for the sodium-ion battery is improved.

The invention provides a waste lithium iron phosphate battery recovery process, and relates to the technical field of battery recovery, the waste lithium iron phosphate battery recovery process comprises the following steps: pre-treating waste lithium iron phosphate batteries to obtain battery powder; mixing the battery powder with a lithium source, and carrying out aerobic roasting and water leaching at 400-600 DEG C to obtain a first lithium-containing solution and modified battery powder; 90-120 g / t of sodium hexametaphosphate, 400-1000 g / t of sulfuric acid, 400-600 g / t of kerosene and 100-200 g / t of 2 # oil are added into the modified battery powder for flotation, and a graphite product and lithium iron phosphate battery powder are obtained. The process can effectively improve the recovery rate and recovery purity of graphite and lithium iron phosphate materials in the battery powder, and is suitable for large-scale industrial recovery treatment.

The invention relates to the technical field of sodium silicate production, and particularly discloses a method for preparing sodium silicate by dissolving fluorine-containing silicon dioxide with alkali lye, which comprises the following steps: step 1, adding fluorine-containing silicon dioxide, sodium carbonate and water into a reaction kettle with a stirrer and a heating device to obtain a mixed material; 2, fully and uniformly stirring the mixed material obtained in the step 1, heating the mixed material by using a reaction kettle, and controlling the reaction temperature and the reaction time for reaction; and 3, filtering and separating the reaction product obtained in the step 2 to obtain a sodium fluoride filter cake and a sodium silicate solution. Sodium carbonate and sodium bicarbonate are used for dissolving silicon dioxide in a liquid phase reaction to prepare sodium silicate, the process is green and environment-friendly, sodium carbonate in chemical production can be effectively utilized, energy is saved, consumption is reduced, and the environment is protected. The technical problems that in the prior art, the temperature is high in the reaction process, a large amount of heat needs to be consumed, and energy consumption is high are solved.

The invention belongs to the technical field of chemical production, and particularly discloses a preparation method of high-purity silicon dioxide, which comprises the following steps: S1, grinding: crushing and grinding minerals or waste residues containing silicon dioxide or silicate; s2, leaching: mixing with a leaching agent according to a ratio, carrying out a leaching reaction, and carrying out solid-liquid separation to obtain a fluorine ion complex solution containing fluosilicic acid; s3, extraction: separating fluosilicic acid from fluorine ion complex impurities by adopting an extraction method to obtain a high-purity fluosilicic acid or fluosilicate solution; s4, pH adjustment: carrying out a double decomposition reaction by adjusting the pH, and carrying out solid-liquid separation to obtain a silicic acid solid and soluble fluoride; and S5, obtaining high-purity silicon dioxide. The preparation method of the high-purity silicon dioxide is suitable for most silicon-containing raw materials, the content of impurities in the silicon slag is effectively reduced, and the purity of the prepared high-purity silicon dioxide can reach 99.99%.

The invention belongs to the technical field of batteries, and particularly discloses a lithium manganese iron phosphate material and a preparation method thereof, a secondary battery and an electric device. The lithium iron manganese phosphate material comprises an inner core and a shell, wherein the inner core is lithium iron manganese phosphate coated with lithium iron phosphate; the shell is positioned on at least part of the surface of the inner core; the shell comprises a fluorine-containing passivator and a carbon material, and based on the total mass of the lithium manganese iron phosphate material, the mass percentage content of fluorine is 0.5%-2.0%, and the mass percentage content of carbon is 1.0%-2.0%. The lithium manganese iron phosphate material has good structural stability and strong conductivity, and is convenient for the battery to give consideration to cyclicity and gram volume exertion at the same time.

The invention relates to a waste circuit board resourceful treatment technology, in particular to a method for recovering sodium fluoride, sodium chloride and sodium bromide from smelting flue gas absorption liquid, which comprises the following steps: (1) carrying out primary evaporative crystallization on the absorption liquid, and separating after the bromine content reaches a first target value to obtain sodium fluoride, primary crystallization mother liquor and condensed water, (2) dissolving sodium bromide in the primary crystallization mother liquor for phase equilibrium blending; (3) carrying out secondary evaporative crystallization on the blended liquid, and separating after the bromine content reaches a second target value to obtain sodium chloride, secondary crystallization mother liquor and condensed water; and (4) carrying out tertiary evaporative crystallization on the secondary crystallization mother liquor, and separating to obtain sodium bromide, tertiary crystallization mother liquor and condensed water. According to the method, high-value sodium fluoride, sodium chloride and sodium bromide can be separated and recycled from the waste circuit board smelting flue gas absorption liquid, condensate water is recycled, no waste liquid is discharged, and good economic and environment-friendly benefits are achieved.

The invention provides a method for recovering fluorine in tailings containing fluorine, tantalum and niobium. The recovery method comprises the following steps: mixing and leaching the fluorine-containing tantalum-niobium ore tailings and a sulfuric acid solution, and carrying out solid-liquid separation to obtain a leachate; mixing and reacting a reducing agent with the leaching solution to reduce iron ions in the leaching solution into ferrous ions, so as to obtain an extraction material solution; mixing the extraction feed liquid with an organic phase, carrying out extraction treatment, and carrying out phase splitting to obtain a fluorine-containing extraction liquid; the organic phase comprises trioctylamine, an additive and a diluent; and mixing the fluorine-containing extraction liquid with an alkali solution, carrying out reverse extraction treatment, and carrying out phase splitting to obtain a fluorine-containing reverse extraction liquid and a no-load organic phase.

The invention belongs to the technical field of aluminum electrolysis waste recovery treatment, and particularly relates to a comprehensive utilization method for aluminum electrolysis waste. The method comprises the following steps: after crushing the aluminum electrolysis waste, reacting the crushed aluminum electrolysis waste with an alkaline solution to generate a mixed solution containing a sodium metaaluminate component and filter residues A; washing the filter residue A for multiple times, and extracting a sodium fluoride saturated solution and a filter residue B; heating and evaporating the mixed solution to separate out sodium fluoride; the pH value of the solution is adjusted through carbon dioxide, and a high-purity aluminum hydroxide and sodium carbonate solution is prepared; separating the washed mixed solution by adopting an electrochemical method to obtain a hydrogen fluoride / ammonium fluoride solution and a sodium hydroxide / sodium carbonate / sodium bicarbonate solution; reacting the filter residue B with dilute acid to prepare a lithium-containing solution, purifying and concentrating, adding sodium carbonate to precipitate lithium to prepare a lithium carbonate product, and reacting aluminum hydroxide with hydrogen fluoride to prepare high-purity aluminum fluoride. According to the method, comprehensive recovery of the aluminum electrolysis waste is achieved, environmental pollution is effectively reduced, and the utilization rate of resources is increased.

The invention relates to the field of tantalum powder mixed salt utilization, and discloses a method for recycling a byproduct fluorine-chlorine-sodium-potassium-containing mixed salt in tantalum powder production. The method comprises the following steps: (1) leaching fluorine, chlorine, sodium and potassium-containing mixed salt in the presence of a leaching agent to obtain a solid mixture A and a salt solution B; (2) sorting the solid mixture A obtained in the step (1) to obtain a tantalum pentoxide crude product and a sodium fluoride product; (3) reacting the salt solution B obtained in the step (1) with a composite fluorine removal agent to obtain a fluorine-containing solid and a salt solution C; and (4) crystallizing the salt solution C obtained in the step (3) to obtain a potassium chloride product and a salt solution D. The method can realize separation and recovery of valuable elements to the greatest extent.

The invention discloses a mixed rare earth concentrate treatment method. The treatment method comprises the following steps that mixed rare earth concentrate reacts with first hydrochloric acid, and chemical separation ore and chemical separation liquid are obtained; roasting the chemical ore to obtain roasted ore; carrying out primary alkaline hydrolysis reaction on the roasted ore and a first alkaline solution to obtain a primary alkaline hydrolysis product; washing the primary alkaline hydrolysis solid product with water to obtain an alkali cake I and alkali washing liquid I; sodium fluoride in the washing alkali liquid I is separated out, and sodium fluoride and residual alkali I are obtained; carrying out a secondary alkaline hydrolysis reaction on raw materials comprising a phosphorus-containing material and a second alkaline solution to obtain a secondary alkaline hydrolysis product; washing the secondary alkaline hydrolysis solid product with water to obtain an alkali cake II and an alkali washing solution II; and separating out trisodium phosphate in the alkali washing liquid II to obtain trisodium phosphate and residual alkali II. According to the method, the fluorine element and the phosphorus element in the mixed rare earth concentrate can be recycled respectively, and the purity of the obtained sodium fluoride and trisodium phosphate is high.

The invention discloses an impurity-containing lithium fluoride mother liquor treatment method which comprises the following steps: filtering the impurity-containing lithium fluoride mother liquor to remove impurities, carrying out replacement electrodialysis to remove salt, and sequentially carrying out reverse osmosis concentration, electrodialysis concentration and resin defluorination on lithium chloride feed liquid subjected to replacement electrodialysis to remove salt, so as to obtain high-quality lithium chloride mother liquor; sequentially carrying out reverse osmosis concentration and electrodialysis concentration on the potassium fluoride feed liquid subjected to replacement electrodialysis salt removal to obtain high-quality potassium fluoride mother liquor; and the diluted lithium fluoride mother liquor subjected to replacement electrodialysis salt removal is sequentially subjected to reverse osmosis concentration and resin weight removal, is softened and then flows back to replacement electrodialysis. The method is simple in treatment process, high in treatment efficiency, high in lithium ion and fluorine ion recovery rate and high in product mother liquor purity. The lithium fluoride mother liquor can be treated in a low-energy-consumption and pollution-free manner, lithium and fluorine resources of the lithium fluoride mother liquor can be effectively utilized, and secondary economic benefits can be generated.

The present invention relates to novel fluorinated compounds and their preparation methods. The invention also relates to the use of said compounds for the preparation of active materials for fluorine batteries, in particular for fluorine battery anodes, for the preparation of fluorine batteries themselves, as well as said active materials and said batteries per se. The compounds have the following formula (I): AxNiF2(I), in which: A is at least one metal selected from Na, K, Li, Rb, Cs, Mg, Ca, Sr, or Ba; and x is such that 0 < x ≤ 1. (no figure)

The invention relates to the technical field of electrode materials, in particular to a Na / SnF2 electrode and a preparation method and application thereof. The first purpose of the invention is to provide a preparation method of a Na / SnF2 electrode, which comprises the following steps: in a glove box protected by inert atmosphere, uniformly coating the surface of a sodium metal sheet with dried SnF2 powder to form a SnF2 layer, and then carrying out heating reaction to enable the SnF2 layer to completely react with Na to obtain the Na / SnF2 electrode. On one hand, a uniform, compact, mechanically firm and NaF-rich SEI protection layer is directly generated on the Na surface, and on the other hand, the metal Na and SnF2 are subjected to a chemical reaction to generate a sodium-tin alloy as a sodium-philic site to guide uniform deposition of sodium. The Na / SnF2 composite electrode prepared by the preparation method disclosed by the invention shows relatively small overpotential and excellent cycling stability in a symmetrical battery.

The invention discloses a wet-process phosphoric acid defluorination residue recycling coupling device and a production method, the coupling device is arranged in a wet-process phosphoric acid production system, and the coupling device comprises a spiral mixing reactor (1), a mixing reactor (2) and a fluorine-containing gas washing and recycling device (3) which are sequentially arranged and connected; the production method comprises the following steps: adding concentrated sulfuric acid with the temperature of 80-90 DEG C into the wet-process phosphoric acid defluorination residues and silica fume in a spiral mixing reactor according to the mass ratio of 100: (5-10), reacting for 40-60 minutes, controlling the reaction temperature to be 90-100 DEG C, returning slurry B to a wet-process phosphoric acid production pre-extraction system, and separating and purifying the slurry B to obtain the wet-process phosphoric acid defluorination residues. Fluorine-containing gases SiF and HF generated by the mixing reaction are sent to a fluorine-containing gas washing and recycling device through a waste gas main pipe to be washed to obtain a 8-15% fluosilicic acid solution. The coupling device is coupled with an existing wet-process phosphoric acid production system, a large number of newly-added equipment and procedures are reduced, the whole process is free of three-waste emission, the method is simple in process, the fluorine recovery rate is larger than or equal to 83%, meanwhile, phosphorus is efficiently recovered, and pollution of fluorine resources to the environment is reduced.

A method for mineralizing a perfluorinated compound by using a molten alkali is provided. The method includes the following steps: mixing NaOH and KOH to obtain a mixed alkali, and heating the mixed alkali to a temperature of 150° C. to 300° C. to a molten state obtain a molten alkali; adding the perfluorinated compound to the molten alkali to obtain a molten reaction system, and holding the molten reaction system at the temperature of 150° C. to 300° C.; and subjecting the molten reaction system to reaction for 15 min to 60 min to mineralizing the perfluorinated compound.

The invention provides a method for recovering fluorine resources by using fluorine-containing silicon powder and synthesizing an A-type molecular sieve, which comprises the following steps: A) mixing the fluorine-containing silicon powder with a sodium hydroxide solution, and heating for reaction to obtain a clear solution and a precipitate sodium fluoride; silicon and sodium in the settled solution are metered by SiO2 and Na2O, and the molar ratio of SiO2 to Na2O is 1.9-2.4; b) mixing sodium aluminate with a sodium hydroxide solution to obtain an alkaline solution of the sodium aluminate, mixing the settled solution in the step A) with the alkaline solution of the sodium aluminate, and stirring to obtain a gel solution; and C) heating and crystallizing the gel solution to obtain the A-type molecular sieve. The removal of organic impurities in the fluorine-containing silicon powder, the efficient separation of fluorine and silicon and the synthesis of the 4A molecular sieve with high purity and few crystal defects are completed through the preparation of low-modulus sodium silicate, filtration and separation and the removal of a small amount of residual fluorine in sodium silicate gel.

To provide a manufacturing method of a hydrogen fluoride remover unlikely to cause deterioration nor cause a necessity of replacement.SOLUTION: A manufacturing method of a hydrogen fluoride remover manufactures a hydrogen fluoride remover configured to remove hydrogen fluoride from a crude fluorine gas being a fluorine gas containing hydrogen fluoride. The manufacturing method includes a sintering step of sintering a molded body of the sodium fluoride at a temperature of 700°C to 900°C to obtain a sintered body.SELECTED DRAWING: None