389 results about "Sodium fluoride" patented technology

The invention provides a positive electrode, a low-temperature electrolyte, a low-temperature sodium-ion battery and a preparation method and application of the low-temperature sodium-ion battery, and belongs to the technical field of battery materials. The low-temperature sodium ion battery comprises a positive electrode, a negative electrode and a low-temperature electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder, sodium salt containing fluorine and sulfur and conductive carbon; the positive electrode is improved by adding sodium salt containing fluorine and sulfur, sulfur / fluorine rich in anion derivatives can be formed on a contact interface of the positive electrode and an electrolyte to form a firm SEI film, the internal resistance of the battery is further reduced, and the coulombic efficiency of the battery during charging and discharging at normal and low temperatures is improved. The low-temperature electrolyte comprises an ester solvent and an ether additive, by adding the ether solvent, the physicochemical property of the electrolyte and the composition of an SEI film on a contact interface of an electrode and the electrolyte are optimized, the viscosity of the electrolyte at low temperature is reduced, the ionic conductivity is improved, and formation of the SEI film rich in sodium fluoride on the surface of a negative electrode can be promoted; and thus, the problem of low coulombic efficiency of battery charge-discharge cycle at low temperature is solved.

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.

The invention relates to the technical field of environmental science and engineering, and discloses a method for removing and recycling fluorine ions by promoting calcium fluoride precipitation through sulfate doping, and the method comprises the following steps: S1, preparing sodium fluoride solutions of sulfate with different concentrations, and analyzing the influence of different sulfate concentrations on calcium fluoride precipitation; s2, respectively adding calcium chloride solutions into the prepared sodium fluoride solutions of the sulfates with different concentrations; s3, the two solutions are subjected to a reaction within a set time, filtering is conducted after the reaction is conducted for a period of time, and the fluorine ion removal reaction is completed. By changing the concentration of sulfate in the sodium fluoride solution, the effect of the sulfate in calcium fluoride precipitation and the influence of the sulfate on the fluorine ion removal efficiency are researched; the positive effect and the action mechanism of the low-concentration sulfate in the calcium fluoride precipitation process are defined, and the problems that the influence of the sulfate in the high-fluoride wastewater on calcium fluoride precipitation is ignored, the calcium fluoride purity is low and the recovery difficulty is large are finally solved.

The invention belongs to the technical field of medical materials, and particularly relates to a tooth whitening composition and a preparation method thereof, the tooth whitening composition comprises the following components by weight: 5%-15% of hydrogen peroxide, 0.5%-1.5% of a gel matrix, 0.2%-1.0% of a thickener, 5%-10% of a humectant, 3%-8% of propylene glycol, 0.05%-0.2% of a chelating agent, 1%-3% of a sweetener, 0.1%-0.5% of sodium fluoride, and the balance of water. Aiming at the problems that an existing tooth whitening product is relatively low in pH value (most of 4.0-5.0), easy to irritate gingiva and sensitive in tooth manufacturing, and the existing tooth whitening product needs to be stored in a dark place at a low temperature and is short in whitening validity period, the pH value of the product is adjusted to 5.5-6.5, so that the product is close to oral saliva, the irritation can be reduced, the stability of the product can be ensured, the product is not easy to decompose, and the tooth whitening effect is good. Active ingredients are prevented from losing efficacy in advance, and the whitening validity period is prolonged.

The invention provides a method for solidifying heavy metal ions in lithium slag, and belongs to the technical field of solidified lithium slag treatment. The method for solidifying the heavy metal ions in the lithium slag comprises the steps that lithium slag powder is taken as a base material, sodium fluoride, silicon carbide, sodium tetraborate and hydroxyapatite are added into the base material for dry mixing, and mixed powder is obtained; adding deionized water into the mixed powder to prepare a spherical green body; drying the spherical green body to obtain a dried green body; and sintering the dried green body, and cooling to room temperature to obtain the cured lithium slag ceramsite. According to the method, pollution-free treatment of the lithium slag is achieved, meanwhile, the treatment process is simplified, environmental damage is reduced, and resource utilization of the lithium slag is improved.

The invention relates to the technical field of grouting materials, in particular to a dynamic water environment anti-dispersion micro-expansion grouting material and a preparation method thereof. A component A of the grouting material mainly comprises the following raw materials in parts by weight: 120-160 parts of a gel material with volcanic ash characteristics, 3-5 parts of a retarder, 10-15 parts of magnesium oxide, 0.5-2 parts of citric acid, 5-8 parts of aluminum sulfate, 1-2 parts of sodium fluoride, 0.5-1 part of gelatin and 70-100 parts of water; the component B mainly comprises the following raw materials in parts by weight: 4-8 parts of polyacrylamide, 5-10 parts of polyacrylic acid derivative salt, 1-2 parts of alcohol polysaccharide, 40-100 parts of water glass and 30-50 parts of water; magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the component A are prepared into core-shell anti-dispersion particles in advance; the problems that a traditional cement grouting material is poor in anti-scouring capacity and anti-dispersing capacity, low in retention rate, poor in stone durability and the like can be solved.

The invention discloses a gel composition for improving compatibility and gelling speed of a tooth whitening product. The gel composition comprises whitening gel and a catalyst, respectively filling the whitening glue and the catalyst into a double-barrel injector; when the tooth whitening gel is used, the push rod is pushed, the whitening gel and the catalyst in the double-tube barrel are squeezed out at the same time and mixed at the mixing head to form the tooth whitening gel capable of being smeared on the tooth surface of a patient, and the pH value of the tooth whitening gel is 7.5-10.0. The catalyst comprises potassium salt or strontium salt, sodium fluoride, glycerol, cross-linked polyacrylamide gels, strong alkaline substances, essence and water; the whitening gel comprises a hydrogen peroxide solution, a cross-linked polyacrylamide gel, glycerin, essence and water. The cross-linked polyacrylamide gel is adopted, the gel is resistant to strong-alkalinity and high-pH environment and various inorganic salt ions such as fluoride, sylvite or strontium salt, the prepared gel is stable in form and good in compatibility, the gel preparation process is simple, the gel is rapidly swelled when encountering water and does not huddle, and long-time standing is not needed.

The invention relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

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.

The invention provides a low-temperature sodium ion electrolyte and a preparation method and application thereof, the low-temperature sodium ion electrolyte comprises a sodium salt, an organic solvent and an additive, the additive is triisopropyl silyl trifluoromethanesulfonate, and the sodium salt is sodium trifluoromethanesulfonate. Triisopropyl silyl trifluoromethanesulfonate molecules are used as an electrolyte additive for the low-temperature sodium ion electrolyte, so that further decomposition of sodium salt in the electrolyte can be effectively promoted, stable SEI containing more sodium fluoride is formed to promote mass transfer of sodium ions at low temperature, and finally, a sodium ion battery can effectively circulate at low temperature.

The invention belongs to the technical field of polymer chemical production, and discloses a method for continuously and efficiently preparing polyether-ether-ketone. The method comprises the following steps: dissolving 4, 4 '-difluorobenzophenone and diphenyl sulfone in a first dissolving tank to obtain a 4, 4'-difluorobenzophenone solution; hydroquinone, a catalyst and diphenyl sulfone are placed in a second dissolving tank to be dissolved, and a hydroquinone solution is obtained; the preparation method comprises the following steps: injecting a 4, 4 '-difluorobenzophenone solution and a hydroquinone solution into a reactor for polymerization reaction to obtain a mixed solution; injecting the mixed solution into a separator through a heat exchanger for separation to obtain polyether-ether-ketone and liquid; distilling the liquid to obtain diphenyl sulfone and sodium fluoride, and returning the obtained diphenyl sulfone to participate in dissolution; all the steps are carried out in a protective atmosphere. The preparation process provided by the invention is a brand new PEEK production process flow, and realizes continuous PEEK production and efficient energy recycling.

The invention provides a zinc-copper-nickel-copper smelting deslagging agent and a preparation method and a use method thereof. The zinc-copper-nickel-copper smelting deslagging agent comprises the following raw materials in percentage by mass: 5-15% of calcium fluoride, 20-30% of sodium carbonate, 5-15% of sodium fluoride, 10-20% of sodium hexafluoroaluminate and the balance of borax. Compared with the prior art, the zinc-copper-nickel-copper slag remover prepared by mixing the raw materials can effectively reduce impurities to be less than 0.14% of Fe, less than 0.005% of Pb and less than 0.003% of Si in the smelting process, the impurity components are obviously reduced, the number of times of component adjustment and unqualified sampling is reduced, impurities mixed in a casting blank are reduced, and finally the metal purity and the casting quality are improved. Meanwhile, loss of zinc and nickel is reduced to the maximum extent; and adverse effects on the zinc-copper-nickel alloy are avoided.

The application provides a preparation method of sodium bisfluorosulfonimide, which comprises the following steps: (1) sulfuryl fluoride and hexamethylsilazane are reacted in an inert atmosphere to obtain a crude product, and the crude product is subjected to gas phase separation to obtain bisfluorosulfonimide; (2) the bisfluorosulfonimide obtained in the step (1) is reacted with sodium fluoride to obtain the sodium bisfluorosulfonimide. The sulfuryl fluoride and the hexamethylsilazane are used as raw materials to prepare the bisfluorosulfonimide by one-step method, the cost is reduced, and the production safety is improved, then the sodium bisfluorosulfonimide is prepared by ion exchange reaction of the bisfluorosulfonimide and sodium fluoride, the three wastes and solvent use are reduced, the impurities are reduced, and the production safety and product quality are improved.

The invention relates to a battery material preparation technology, in particular to a method for preparing high-purity cobaltous sulfate from crude cobaltous hydroxide, which comprises the following steps: S1, reacting the crude cobaltous hydroxide with sulfuric acid to generate magnesium sulfate; s2, washing to remove magnesium; s3, adding sulfuric acid and hydrogen peroxide into the crude cobalt hydroxide after magnesium washing; adding crude cobalt hydroxide to adjust the pH value to obtain a purified solution; s4, adding sodium fluoride into the purified liquid, and filtering after reaction to obtain filtrate; s5, saponifying with sodium hydroxide by using an acidic extractant, then performing soap conversion by using a cobalt sulfate solution, extracting manganese in the filtrate by using an obtained organic phase, and then performing reverse extraction on the organic phase by using sulfuric acid to obtain a manganese sulfate solution; s6, the raffinate obtained after manganese extraction is introduced into an adsorption tower loaded with a zirconium-based composite fluorine adsorbent; and S7, concentrating and crystallizing the defluorinated solution. According to the method, the zirconium-based composite fluorine adsorbent is introduced to be coupled with the process, fluorine ions can be removed, and cobalt loss caused by cobalt fluoride precipitation and the influence of the fluorine ions on the quality of a cobalt sulfate product are avoided.

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

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 provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The invention discloses a novel sodium ion battery halide solid electrolyte, and belongs to the technical field of electrolyte materials, the molecular formula of the halide solid electrolyte is NaXTaCl5FX, X is equal to 1-3, the halide solid electrolyte is weighed according to the molar ratio of tantalum chloride to sodium fluoride under the protection of argon, and electrolyte matrix mixed powder is obtained through high-energy ball milling; carrying out ball milling on nano silicon dioxide and zinc bromide according to a molar ratio to prepare a sintering aid; the electrolyte matrix mixed powder is pressed into a biscuit piece, and the biscuit piece is subjected to heat treatment in argon to obtain a halide electrolyte matrix; and finally, grinding the halide electrolyte matrix, doping a sintering aid, tabletting, sintering and ball-milling to obtain the novel sodium-ion battery halide solid electrolyte. And densification and structural stability of the material are synergistically realized, and finally the solid electrolyte with high ionic conductivity and wide electrochemical window is obtained.

The invention provides a method for synthesizing a Y-type molecular sieve by using fluorine-containing silicon powder and recovering fluorine resources, 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; the molar ratio of SiO2 to Na2O in the clear solution is 1.9 to 2.4; b) mixing a part of the clarified solution with a high-alkali sodium metaaluminate solution, and activating to obtain an activated directing agent; c) mixing the residual clear solution, the activated guiding agent, the aluminum sulfate solution and the sodium sulfate solution, and stirring to obtain gel; and D) heating and crystallizing the gel to obtain the Y-type molecular sieve. According to the invention, the removal of organic impurities in the fluorine-containing silicon powder, the efficient separation of fluorine and silicon and the synthesis of the Y-type molecular sieve with high purity and few crystal defects are realized by preparing and filtering the low-modulus sodium silicate and removing a small amount of residual fluorine in the sodium silicate.

The application provides a zinc phosphide negative electrode material, which comprises a zinc sheet substrate and a zinc phosphate protective layer; the zinc phosphate protective layer is obtained in situ on the surface of the zinc sheet by immersing the zinc sheet in a phosphoric acid solution; the phosphoric acid solution comprises phosphoric acid, zinc oxide, sodium fluoride, zinc nitrate, sodium perchlorate, organic ammonium and ammonia water. The zinc phosphide negative electrode material has good reversible deposition / dissolution performance, excellent energy storage performance, high stability and can be stably cycled for a long time.

The invention discloses a process method for preparing aluminum fluoride by recovering electrolytic aluminum electrolyte, and relates to the technical field of waste material recovery. The invention relates to a process method for preparing aluminum fluoride by recovering electrolytic aluminum electrolyte. The preparation method comprises the following steps: firstly, grinding the carbon residue or electrolyte into powder, wherein the fineness is greater than 150 meshes; adding water into the powder, pulping, and adding a certain amount of aluminum sulfate or aluminum hydroxide; sulfuric acid is added for leaching under the stirring condition, the leaching temperature ranges from 70 DEG C to 100 DEG C, the leaching time ranges from 2 h to 5 h, and the pH of the leaching end point ranges from 1 to 2; adding water to dilute the filtrate, adding caustic soda flakes to adjust the pH value to 12-14 to remove impurities, and filtering out insoluble hydroxides to obtain a mixed salt solution of sodium fluoride and sodium metaaluminate; adding sulfuric acid into the mixed salt solution while stirring to adjust the pH value to 3-6, and reacting at the temperature of 60-100 DEG C for 2-5 hours to obtain aluminum fluoride slurry; and filtering and washing the slurry to obtain aluminum fluoride trihydrate, and calcining at 500-700 DEG C to obtain anhydrous aluminum fluoride with the purity of more than 95%. The method turns waste into wealth, recycles resources, and is short in process flow, low in cost and high in recovery rate.

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 application discloses a preparation method and application of a fluoride sodium ion battery positive electrode material, and belongs to the technical field of sodium ion battery positive electrode material preparation, and comprises the following steps: (1) dissolving an iron salt in deionized water to obtain an A solution; uniformly mixing sodium fluoride and an inorganic acid in water to obtain a B solution; (2) dropping the A and B solutions into a co-precipitation reaction kettle at the same flow rate, and reacting under heating and stirring, and monitoring the pH value of the reaction system in real time; and washing and drying to obtain a precursor Na3FeF6; (3) mixing the precursor with a carbon source, and sintering under an inert atmosphere to obtain a sodium ion battery positive electrode material NaFeF3@C coated with a carbon layer; the application effectively solves the capacity attenuation and cycle stability problems of the sodium ion battery positive electrode material, and provides a solution with high performance, low cost and environmental friendliness for development of the sodium ion battery positive electrode material.

This invention relates to a sodium-supplementing material capable of simultaneously replenishing active sodium and sodium hexafluorophosphate, and its preparation and application. The sodium-supplementing material comprises the following raw material components by weight percentage: 10-50% elemental phosphorus, 50-90% sodium fluoride, and 1-5% Ketjen Black. Compared with existing technologies, the phosphorus-based bifunctional sodium-supplementing separator and sodium-supplementing cathode provided by this invention not only possess higher theoretical capacity, effectively compensating for irreversible capacity loss during the first cycle of the battery, but also generate NaPF6 in situ under electrochemical conditions through the synergistic reaction of red phosphorus and sodium fluoride, achieving simultaneous replenishment of active sodium and electrolyte sodium salts, thereby improving the initial coulombic efficiency and long-term cycle performance of the battery.

The invention relates to a method for recovering an antimony resource in arsenic-removed lead anode slime by a fluorination conversion method, which comprises the following steps of: grinding fluoride, a slag former, a reducing agent and the arsenic-removed lead anode slime to a certain particle size, and mixing according to a certain proportion to obtain a mixed material; the mixed material is subjected to high-temperature reduction smelting, the adding amount of fluoride, the adding amount of a slag former, the adding amount of a reducing agent, the smelting temperature and the smelting time are controlled, sodium antimonate in the arsenic-removed lead anode slime reacts with fluoride to generate sodium fluoride and antimony pentoxide, antimony pentoxide is reduced into metal antimony by the reducing agent, and lead-antimony alloy is formed; antimony resources in the arsenic-removed lead anode slime are recycled, and other components become smelting slag; and the addition amount of the fluoride relative to the arsenic-removed lead anode slime is 5-10 wt%. Compared with the prior art, the recovery efficiency of antimony resources in the arsenic-removed lead anode slime is improved.

The invention relates to the technical field of zinc hydrometallurgy, and discloses an analysis method for measuring high cobalt content by an EDTA complexing back titration method, which is based on the following steps: oxidizing Co < 2 + > into Co < 3 + > by using potassium nitrite in an acetic acid medium to form cobalt potassium nitrite precipitate so as to realize separation of cobalt and interfering ions, dissolving the precipitate, complexing with excessive EDTA, and performing back titration by using a zinc standard solution. Xylenol orange is used as an indicator, and determination is completed at room temperature in a hexamethylenetetramine buffer system with the pH value being approximately equal to 5.8. Coexisting ion interference is effectively eliminated through tartaric acid, sodium fluoride, thiourea and other masking agents, the method has the advantages of being easy and convenient to operate, sensitive in end point, high in accuracy and low in cost, and the requirement for conventional analysis of high-cobalt materials can be met.

The application provides an automatic titration analysis method for measuring the aluminum content in high aluminum alloy, which adopts direct reaction of fluoride with a test solution to realize one-step direct titration, and determines the aluminum content in the range of 2.00% to 100.00%, and comprises the following steps: sample decomposition; precipitation of interfering ions; calibration of sodium fluoride standard solution; calibration of automatic potentiometric titrator; and measurement of the sample to be tested. The application solves the problems of sample pretreatment and how to avoid the influence of interfering ions on the determination of aluminum content. The titration operation, reading and calculation are automatically completed by the instrument, effectively reducing human errors, and the application has the advantages of simple operation, accurate and rapid results, wide application range and the like.

The present disclosure provides a method for solidifying heavy metal ions in lithium slag, belonging to the technical field of lithium slag treatment. The method for solidifying heavy metal ions in lithium slag comprises: taking lithium slag powder as a base material, adding sodium fluoride, silicon carbide, sodium tetraborate and hydroxyapatite to the base material for dry mixing to obtain a mixed powder; adding deionized water to the mixed powder to prepare a spherical green body; drying the spherical green body to obtain a dry green body; and performing sintering treatment on the dry green body, and cooling to room temperature to obtain solidified lithium slag ceramsite. The method realizes nuisance-free treatment of lithium slag, simplifies the treatment process, reduces environmental damage, and improves the resource utilization of lithium slag.

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