470 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 discloses a film coating agent for accelerating stabilization of a weathering resistant steel rust layer in a severe atmospheric environment. The film coating agent comprises a film-forming agent and a spraying agent, the film-forming agent comprises a gel agent and a transforming agent; the gel is prepared from one or more of tannic acid, carbomer, chitosan and gelatin; the transforming agent comprises one or more of magnesium sulfate, zinc sulfate and sodium molybdate; the spraying agent comprises an accelerant and an aggressive agent; the accelerant comprises one or more of sodium sulfate, potassium sulfate and chromium sulfate; the aggressive agent comprises one or more of sodium chloride, aluminum chloride and sodium fluoride. The film coating agent provided by the invention can form a stable and uniform rust layer on the surface of the weathering resistant steel, so that the corrosion resistance of the weathering resistant steel is improved.

According to the impurity removal method for the ferrophosphorus slag, impurities such as Al, Cu, Ti, carbon and organic electrolyte in the ferrophosphorus slag can be effectively removed through the method. The method comprises the following steps: (1) carrying out high-temperature calcination on ferrophosphorus slag A and chloride under a reduction condition to obtain ferrophosphorus slag B; (2) leaching the ferrophosphorus slag B to obtain ferrophosphorus liquid A and filter slag A; (3) adding sodium fluoride into the ferrophosphorus liquid A to obtain ferrophosphorus liquid B and filter residues B; and (4) adding iron powder into the ferrophosphorus liquid B, and carrying out solid-liquid separation to obtain the high-purity ferrophosphorus liquid. Meanwhile, the invention provides a method for preparing a ferromanganese phosphate precursor and an iron phosphate precursor by adopting the high-purity ferrophosphorus liquid obtained by the method.

The invention discloses a high-adhesiveness corrosion-resistant powder coating and a preparation method thereof, and belongs to the technical field of coatings. The powder coating is prepared from the following raw materials: modified epoxy resin, composite modified filler, a curing agent, a flatting agent, a dispersing agent, benzoin, sodium fluoride and the like. The epoxy resin is modified, amino is introduced to enhance the interaction with the grafted phosphate nano-silica, and BYK-163 is introduced, so that the compatibility is improved. In the composite modified filler, nano silicon dioxide A is grafted with a phosphate group, and can form a chemical bond with metal and quickly form a passive film; the nano silicon dioxide B is grafted with a fluorine-containing group, so that the coating is endowed with low surface energy and chemical stability, and long-acting protection is realized. Sodium fluoride destroys metal lattices at high temperature to form anchor points, and adhesive force is improved. The problem that a traditional powder coating is insufficient in adhesive force and corrosion resistance is solved, and the powder coating is suitable for metal protection in various complex environments and has wide application prospects.

A seamless flux-cored wire for 10CrNiCu steel for ships, applied to welding of continuous casting 907A steel for a main hull and composed of a low-carbon steel sheath and a flux core. The diameter of the wire is 1.0-1.4 mm; the filling rate of flux-cored powder is 14%-16%; measured as the mass percentage of the flux-cored wire, the flux core contains rutile, aluminum oxide, ferroboron, zircon sand, quartz, bismuth oxide, potassium titanate, sodium fluoride, electrolytic manganese, ferrotitanium, magnesium powder, manganese-silicon alloy, nickel powder, metal chromium, copper powder, and iron powder. The seamless flux-cored wire for 10CrNiCu steel for ships has the advantages of good welding performance, stable mechanical properties, good crack resistance, low diffusion hydrogen content, high moisture absorption resistance, excellent rust resistance, and the like. Also provided is a method for manufacturing the seamless flux-cored wire for 10CrNiCu steel for ships

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 provides an ultra-low carbon duplex stainless steel all-position welding flux-cored wire and a welding method thereof.The outer skin of the flux-cored wire is a stainless steel strip, the flux-cored wire is filled with powder, and the powder comprises, by mass, 18-25% of natural rutile, 20-30% of stainless steel powder, 20-30% of stainless steel powder, 20-30% of stainless steel powder and the balance stainless steel powder. 3-5% of sodium titanate; 5-10% of quartz sand; 0.5 to 4 percent of zircon sand; 1-3% of sodium fluoride; 15 to 25 percent of ferromolybdenum; 3-6% of nitrided ferrochrome; 2-4% of electrolytic manganese; 5-8% of nickel powder; 27 to 32 percent of metal chromium; 0.5-2% of magnesium powder; 0.5 to 1.5 percent of bismuth oxide; and 1-4% of silicon iron. The flux-cored wire is used for all-position welding of third-generation duplex stainless steel, welding spatter is small, and weld joint forming is good; the carbon content of a weld joint is extremely low, and through component and welding process control, weld joint metal has strength, plasticity, toughness and corrosion resistance equivalent to those of base metal. And the double requirements of high strength and toughness and high corrosion resistance in the manufacturing fields of submarine pipeline laying, shipbuilding, marine gas field exploitation and the like are ensured.

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 discloses bloom ultrahigh-carbon wear-resistant ball steel continuous casting covering slag and a preparation method thereof, and belongs to the technical field of steelmaking metallurgy auxiliary materials. The high-temperature-resistant electric smelting material is prepared from the following raw materials in parts by weight: 15-28 parts of wollastonite powder, 20-40 parts of an electric smelting pre-melting material, 3-6 parts of lithium metaborate, 2-8 parts of boron glass, 2-4 parts of sodium fluoride, 5-13 parts of sodium carbonate, 2-7 parts of barium fluoride, 7-11 parts of fluorite powder, 2-5 parts of electrode graphite, 2-5 parts of high-carbon amorphous graphite, 2-4 parts of N660 carbon black and 2-4 parts of dextrin. According to the mode, the casting liquid has relatively low viscosity, relatively low melting point and relatively high alkalinity, the lubrication of a casting blank is improved, the capability of absorbing floating inclusions in molten steel is improved, the occurrence rate of cracks and bleed-out on the surface of the casting blank is reduced, the surface and subcutaneous quality of the casting blank is improved, and the production efficiency of continuous casting is improved; the casting powder is particularly suitable for continuous casting production of bloom ultrahigh-carbon wear-resistant ball steel.

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.

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 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 invention belongs to the technical field of electrochemical energy storage, and particularly relates to a battery capable of supplementing lithium or sodium in situ, which comprises a positive plate, a negative plate and an electrolyte, and is characterized in that the electrolyte contains a component A, and a positive electrode and / or a negative electrode contains a component B; the structural general formula of the component A is X-Y, and X is lithium fluorosulfonate, sodium fluorosulfonate, lithium difluorophosphate or sodium difluorophosphate; y is boron trifluoride or phosphorus pentafluoride; the component B is at least one of lithium oxalate, sodium oxalate, lithium fluoride and sodium fluoride. Compared with the prior art, the component A and the component B are simultaneously added into the battery disclosed by the invention, so that the battery shows more excellent cycle performance and high-temperature performance. The combination mode has better performance compared with the mode that the component B is independently used in the electrode material or the component A is independently used in the electrolyte.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a photocatalysis and biodegradation coupled catalytic material as well as a preparation method and application thereof. The photocatalysis and biodegradation coupled catalytic material comprises a polyurethane sponge and a sodium fluoride based TiO2 / reduced graphene oxide composite material loaded on the polyurethane sponge, and the polyurethane sponge and the sodium fluoride based TiO2 / reduced graphene oxide composite material are connected through a thermoplastic resin adhesive; the preparation method comprises the following steps: adding the alcohol compound into the thermoplastic resin adhesive, heating, stirring until the alcohol compound is dissolved, adding the polyurethane sponge, uniformly stirring, adding the turbid liquid of the sodium fluoride-based TiO2 / reduced graphene oxide composite material, uniformly mixing, drying, and cleaning. Biofilm formation is carried out on the basis of the obtained photocatalysis and biodegradation coupled catalytic material, and the obtained ICPB system is applied to treatment of ciprofloxacin wastewater and has good degradation efficiency on antibiotics.

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 invention provides a flux-cored wire for marine crack arrest steel and a preparation method and application of the flux-cored wire, and particularly relates to the technical field of welding materials. The flux-cored wire comprises a steel strip and a flux core filled in the steel strip, and the flux core comprises the following components in parts by weight: 10-15 parts of rutile, 5-6 parts of quartz, 2-4 parts of ferrotitanium, 20-40 parts of sodium fluoride, 20-40 parts of potassium feldspar, 6-18 parts of manganese-silicon alloy, 4-8 parts of low-carbon ferromanganese, 1.5-2.5 parts of magnesium powder, 1.5-2 parts of rare earth ferrosilicon, 0.2-0.4 part of ferroboron, 1-2 parts of metallic nickel and 1.5-6 parts of iron powder. The ship crack arrest steel flux-cored wire has the advantages of being high in strength, good in low-temperature toughness, good in crack resistance, high in deposition rate, stable in electric arc, little in splashing, easy in slag removal and attractive in weld joint forming, and is suitable for welding of crack arrest steel at a core structure part of an ultra-large container ship.

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 provides a method for treating waste water containing fluorine and aluminum, which comprises the following steps: S1, first treatment: reacting a first mixed solution, and carrying out solid-liquid separation to obtain a first treated solution and first treated slag; wherein the first mixed solution comprises waste water containing fluorine and aluminum and ammonia water, and the pH value of the first mixed solution is 7-8; s2, second treatment, wherein the second treatment comprises the steps S2'and S2 ''; s2 ', the first treatment slag and a hydrofluoric acid solution are mixed for acid dissolution, and an acid solution is obtained; mixing an acid solution and sodium fluoride, and carrying out precipitation treatment to obtain cryolite; s2 '', mixing the first treatment liquid with calcium chloride, performing defluorination treatment, and performing solid-liquid separation to obtain calcium fluoride and defluorination waste liquid. By the treatment method, cryolite with high yield and high purity can be prepared, and meanwhile, the low-aluminum and low-fluorine discharge requirements can be met.

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 field of pickling wastewater treatment in the iron and steel industry, and discloses a method and a system for resourceful treatment of industrial wastewater containing fluorine and heavy metal ions. The method comprises the following steps: converting heavy metal ions and fluorine ions in wastewater into hydroxide and fluorine-containing complex co-precipitation by using sodium hydroxide, separating the hydroxide and fluorine-containing complex co-precipitation from a water phase, and converting the heavy metal fluorine-containing complex in the co-precipitation into water-insoluble heavy metal hydroxide and water-soluble sodium fluoride by using sodium hydroxide; sodium fluoride in the water is converted into calcium fluoride precipitate and water-soluble sodium hydroxide by using calcium hydroxide, the obtained NaOH aqueous solution is reused as a part of the sodium hydroxide in the previous step, a small amount of residual heavy metal ions and fluorine ions in the wastewater are completely precipitated by using calcium hydroxide, and the generated wastewater enters a biochemical system for denitration treatment. The method greatly reduces the consumption of sodium hydroxide and the output of solid hazardous wastes, relieves the burden of biochemical treatment, and reduces the cost of whole wastewater treatment.

The invention relates to a preparation method of a solid electrolyte, which comprises the following steps: preparing a filler: adding reactants 2, 5-dihydroxy terephthalaldehyde and triaminoguanidine hydrochloride into a solvent, mixing, and stirring to react to obtain a reaction product; adding the reaction product into a saturated sodium fluoride aqueous solution, and stirring to obtain a product; washing and drying the product to obtain a filler; the preparation method comprises the following steps: mixing lithium bis (trifluoromethylsulfonyl) imide, vinylene carbonate, a polyvinylidene fluoride-hexafluoropropylene copolymer, a filler and an organic solvent, and then adding an initiator azodiisobutyronitrile to obtain mixed slurry; and drying the mixed slurry to obtain the solid electrolyte. The invention also provides the composite solid electrolyte, a battery and an electric device. The solid electrolyte integrates the characteristics of the polymer electrolyte and the filler, and has better mechanical properties while improving the ionic conductivity.