234 results about "Potassium fluoride" 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.

The invention relates to the technical field of welding, in particular to a lead-free solder composition and a preparation method thereof. The composition comprises brazing filler metal and a brazing flux, wherein the brazing filler metal comprises 55 to 65 parts of copper, 30 to 40 parts of zinc, 0.5 to 1 part of silver, 0.1 to 1 part of tin, 0.1 to 0.5 part of nickel, 0.02 to 0.15 part of lanthanum, 0.03 to 0.15 part of cerium and 0.05 to 0.2 part of indium; the brazing flux comprises 18-22 parts of borax, 13-17 parts of boric acid, 25-32 parts of a potassium fluoride and potassium fluoborate compound, 3-5 parts of calcium fluoride, 12-16 parts of aluminum oxide and 8-11 parts of magnesium oxide. The lead-free solder composition does not contain toxic lead elements, pollution to the environment and the ecological system is little, the wettability, corrosion resistance, strength, stability and the like of the lead-free solder composition are improved, and the welding quality is comprehensively improved. According to the preparation method, uniform distribution and accurate control of the brazing filler metal and the brazing flux are guaranteed, stability and consistency of product quality are guaranteed, and the preparation method is easy and convenient to operate and suitable for mass production.

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 discloses a method for removing iron impurities in regenerated aluminum alloy, and belongs to the field of non-ferrous metal regeneration, recovery and impurity removal. The method comprises the following steps: weighing an iron removal flux (25-45 wt.% of boron-containing potassium fluoride, 20-30 wt.% of sodium chloride and 20-35 wt.% of potassium chloride) according to the mass percentage, stirring, mixing and drying; according to the method, the aluminum scrap is put into the smelting furnace to be smelted, then the iron removal flux and the permanganate catalyst are added into the aluminum scrap melt, stirring and standing are carried out, the aluminum melt with the iron impurity element removed is obtained, the method does not affect the aluminum obtaining rate, meanwhile, the iron content is remarkably reduced, and the method is applied to aluminum ingots obtained through green regeneration smelting of the aluminum scrap and has the beneficial effects that the cost is low; the environment is not damaged and the steps are simple.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The invention discloses an ultraviolet curing organic silicon conductive adhesive and a preparation method thereof, and relates to the technical field of conductive materials, the ultraviolet curing organic silicon conductive adhesive comprises the specific components of organic silicon matrix resin, a photosensitive curing agent, a conductive filler, a reactive diluent, a coupling agent and a thixotropic agent; the photosensitizer further comprises carborane cluster particles, a phosphazene silane nanocage, a sulfur-doped tungstate nanosheet, a potassium fluoride modified hollow graphene ball and an additive of a germanoxane photosensitizer. The material is prepared based on the materials. According to the preparation method, multiple functional additives are introduced into a traditional ultraviolet curing organic silicon conductive adhesive system, a multi-dimensional conductive path is constructed on the molecular and nanoscale, and the photocuring initiation efficiency and the interface stability are optimized, so that the prepared conductive adhesive not only realizes low resistivity, but also can be rapidly and deeply cured in an adhesive layer with relatively high thickness; and meanwhile, excellent damp-heat resistance and corrosion resistance are achieved.

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 discloses a preparation method of fluoroethylene carbonate, and belongs to the technical field of organic synthesis. According to the method, a three-in-one catalytic system of a fluorine source, a promoter and a phase transfer catalyst is constructed, so that the technical bottleneck of a traditional fluorination process is broken through. The method for in-situ generation of hydrogen fluoride comprises the following steps: taking a fluoro basic salt (such as potassium fluoride) as a fluorine source and concentrated sulfuric acid as a promoter to generate hydrogen fluoride (HF) in situ, and avoiding direct use of dangerous fluorine gas; reaction conditions are optimized: mild reaction and uniform precipitation of a byproduct (potassium chloride) are realized by adopting a composite fluorinating agent, and solid-liquid separation is facilitated. The method is high in reaction selectivity, and the yield reaches 93.5%. Raw materials are cheap and easy to obtain, equipment requirements are low, and large-scale production is facilitated. The FEC purity after rectification is gt; the lithium ion battery electrolyte additive meets the requirements of lithium ion battery electrolyte additives, and is especially suitable for the field of high-performance lithium ion batteries.

The invention discloses a modification and grain refiner for Al-Si series die-casting aluminum alloy, which comprises the following components in mass percentage: 60-80% of rare earth aluminum alloy powder, 19-39% of auxiliary agent A, and 0.1-1.0% of auxiliary agent B; in the rare earth aluminum alloy powder, rare earth elements account for 2-20% of the total amount, the total amount of Fe and Si is ≤0.1%, and the balance is aluminum; the rare earth element is any one or a combination of two of La, Ce, Y, Er, and Sc; the auxiliary agent A comprises light calcium carbonate, sodium cryolite, potassium cryolite, sodium fluorosilicate, lithium fluoride, potassium fluoride, sodium fluoride, aluminum fluoride, sodium chloride, potassium chloride, potassium fluoroborate, magnesium chloride, and hexachloroethane; the auxiliary agent B comprises polyethylene glycol and stearamide. The modification and grain refiner obtained by mixing rare earth aluminum alloy powder, additive A and additive B can be evenly dispersed in the aluminum alloy melt to play the role of long-term modification and grain refinement as well as refining and dehydrogenation.

The invention belongs to the technical field of materials, and relates to a preparation method of a fluorinion-induced manganese oxide composite material and application of the fluorinion-induced manganese oxide composite material as a positive electrode material in an aqueous magnesium ion capacitor. The preparation method comprises the following steps: firstly, preparing a MnO2 precursor from a positive electrode through a hydrothermal method, and annealing to obtain a pure-phase MnO2 nanoflower structure; the preparation method comprises the following steps: preparing MnO2 nanoflowers, adding the prepared MnO2 nanoflowers into polyethylene glycol, adding manganese chloride, potassium fluoride and polyvinylpyrrolidone, carrying out ultrasonic dispersion for 30 minutes, continuously stirring for 1 hour, and transferring the obtained mixed solution into a Teflon reaction kettle for hydrothermal reaction to obtain the MnO2 / Mn2O3 / KMnF3 composite material. The composite material is used as a positive electrode and activated carbon is used as a negative electrode to assemble a water-based magnesium ion capacitor device, and the water-based magnesium ion capacitor device can reach relatively high specific capacitance after an electrochemical test. According to the invention, a hydrothermal method is adopted for synthesis, the process is simple, the material cost is low, and the material is non-toxic and harmless, so that the capacitor has high practical application value and is expected to become a novel green energy storage device.

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 invention relates to the technical field of monopotassium phosphate production, and discloses a monopotassium phosphate solution purification method and a device thereof.The monopotassium phosphate solution purification method comprises the following steps that S1, a potassium fluoride solution is tempered, S2, activated carbon decoloration is conducted, S3, filter pressing and impurity removal are conducted, S4, heat treatment and sedimentation are conducted, filtrate is heated to 95-105 DEG C and then fed into a heat sedimentation tank for sedimentation separation, and clear liquid overflows to enter a subsequent concentration procedure; the potassium fluoride solution is used for carrying out hardening and tempering reaction, so that calcium and magnesium ions are effectively removed; and adding a small amount of active carbon for decoloration. The treated solution is subjected to filter pressing to remove impurities, and then the steam consumption is remarkably reduced through the closed and pressurized heat treatment and sedimentation process. The process is high in automation degree and low in production cost, and the purity of the final product is superior to the industrial superior product standard.

The application discloses a potassium fluorotantalate crystallization purification method, and relates to the technical field of tantalum hydrometallurgy and fluorotantalate crystallization purification. The method comprises the following steps: filtering a tantalum-containing fluorine acid solution, adding a potassium source and a tantalum-niobium separation type composite crystallization regulator, stirring and complexing, seed induction, controlled cooling crystallization, graded removal of the regulator, solid-liquid separation, and potassium fluoride containing fluorine acid washing to obtain primary purified potassium fluorotantalate crystals, and then redissolving the primary purified potassium fluorotantalate crystals in a fluorine-containing acid solution, correcting the K / Ta molar ratio, repeatedly regulating and crystallizing, graded removal of the regulator, washing, and drying to obtain high-purity potassium fluorotantalate. The regulator can reduce the entrainment of niobium impurities and reduce the residual amount of the regulator itself, thereby improving the purity of the product and the Ta yield.

This invention provides a micro-arc oxidation electrolyte for magnesium alloy surface treatment and a method for preparing a micro-arc oxidation film. The micro-arc oxidation electrolyte is an aqueous solution containing sodium silicate, sodium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles; or, an aqueous solution containing sodium silicate, potassium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles. This invention also discloses a method for preparing a micro-arc oxidation film using the aforementioned micro-arc oxidation electrolyte for magnesium alloy surface treatment. The micro-arc oxidation electrolyte of this invention contains conductive ceramic nanoparticles—titanium boron carbon nitride conductive nanoparticles. Using these nanoparticles to perform a micro-arc oxidation reaction on the magnesium alloy surface can improve the microstructure of the micro-arc oxidation film, while simultaneously enhancing the corrosion resistance and wear resistance of the magnesium alloy after micro-arc oxidation treatment, significantly improving the surface protection capability of the magnesium alloy, and extending its service life.

The invention relates to the field of medicine synthesis, in particular to a synthetic method of levofloxacin, which comprises the following steps: (1) adding levofloxacin, N-methyl piperazine, a solvent and potassium fluoride into a reactor, heating to 70-90 DEG C, reacting for 3-6.5 hours, after the reaction is finished, controlling the internal temperature to be below 120 DEG C, recovering under reduced pressure until no distillate is produced, and then continuously recovering for 0.5 hour until the mixture is dry; and adding water into the filtrate, and carrying out reverse heating, cooling and suction filtration to obtain the levofloxacin. According to the synthetic method of levofloxacin provided by the invention, a solvent is added to filter out a byproduct of generated potassium bifluoride, and water is directly added into filtrate for crystallization. In the whole process before crystallization, no water is introduced, no hydrogen fluoride is dissociated, equipment corrosion is avoided, the pipette shrinkage reaction conditions are mild, the reaction time is short, no extraction operation is adopted, three wastes and energy consumption are reduced, the production efficiency is improved, and a crystallization solvent is the same as a reaction solvent and is convenient to recycle and reuse.

The application discloses a methyl sulfonate derivative and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding carboxylic acid, dimethyl sulfoxide (DMSO) and potassium fluoride (KF) into a pressure-resistant reaction bottle, and heating at 180 DEG C for 6 hours through an oil bath; (2) after the reaction is completed, the obtained substance is extracted with ethyl acetate for three times, the organic layer is washed with water for two times in sequence, the washed organic layer is dried with anhydrous sodium sulfate, filtration is conducted, and a filtrate is obtained; (3) the obtained filtrate is concentrated under reduced pressure, the concentrated residue is separated and purified by using a silica gel column chromatography, and the methyl sulfonate derivative is obtained. The preparation method directly uses KF to catalyze the reaction of carboxylic acid and DMSO, does not need to use complex substrates, noble metal catalysts and phosphorus ligands, and has the advantages of simple operation, greenness, low cost and high yield (up to 92%).

This application relates to the field of synthesis technology of lithium-ion battery electrolyte additives, specifically to a synthesis process of 1,3-propanedisulfonyl fluoride. The synthesis process includes the following steps: S1. Adding 1,3-propanedisulfonyl chloride and potassium fluoride to a reaction vessel; S2. Adding distilled water as a reaction solvent to the reaction vessel and refluxing under stirring; S3. After the reaction solution has settled and separated into layers, separating and collecting the oil phase, adding toluene and activated carbon to the oil phase, and refluxing for decolorization; S4. Performing a first crystallization treatment on the decolorized solution, followed by filtration, and washing the filter cake obtained from the filtration; S5. Collecting the filtrate obtained after the first washing and performing a second crystallization treatment, followed by filtration again; S6. Vacuum drying the filter cake obtained in steps S4 and S5 to obtain 1,3-propanedisulfonyl fluoride. This application features mild reaction conditions, simple operation, low cost, and environmental friendliness.

The invention discloses a method for polishing titanium alloy through magnetic field enhanced electrolytic plasmas for improving uniformity, and belongs to the technical field of metal material surface treatment. The magnetic field enhanced electrolytic plasma titanium alloy polishing method for improving the uniformity comprises the following steps that a magnetic field with the strength being 0.1-0.5 T is applied while electrolytic plasma polishing is conducted on titanium alloy, and polishing of the titanium alloy is achieved; a polishing solution used for electrolytic plasma polishing is a mixed aqueous solution of ammonium fluoride and potassium fluoride; in the mixed aqueous solution, the concentration of ammonium fluoride is 3-18 g / L, and the concentration of potassium fluoride is 25-100 g / L. According to the method, the movement behavior of the electrolytic plasma is guided through the magnetic field, so that fluorine ions and hydroxyl radicals are distributed on the surface of the electrode in a concentrated manner, the uniformity of chemical reaction is optimized, the consistency of material removal is improved, and the phenomenon of local over-polishing or under-polishing is reduced. And the quality of the titanium alloy polished surface is improved.

The utility model relates to a deflurane raw material processing device which comprises a drying box, a heating air box, a material bearing box and a sealing mechanism, when potassium fluoride needs to be dried in the preparation process of desflurane, the potassium fluoride can be placed in the material bearing box, the material bearing box is placed on the partition plate, then the heating air box is operated, the heating air box guides hot air into the drying box through the air inlet and dries the potassium fluoride, and then wet air is exhausted through the exhaust outlet. After drying is completed, the pushing assembly can be operated to drive the sealing plate to move, the sealing plate is inserted into the inserting grooves in the top and the bottom of the material bearing box, the sealing plate seals the material bearing box, then the sealed material bearing box is taken out, and therefore the desflurane raw material can be better dried; in addition, the dried desflurane raw material is prevented from absorbing moisture in air again, and subsequent processing of desflurane is guaranteed.

The invention discloses a low-melting-point high-transference-number electrolyte material for a fluorine ion thermal battery and a preparation method thereof.The preparation method comprises the steps that lithium fluoride, sodium fluoride and potassium fluoride are mixed in proportion and subjected to first calcination treatment for 4-6 h at the temperature of 500-600 DEG C, an obtained product is rapidly cooled, and powdery ternary fluoride eutectic salt is obtained; mixing cesium fluoride with the ternary fluoride eutectic salt in proportion, performing secondary calcination heat treatment for 4-6 hours at the temperature of 600-700 DEG C, and then quickly cooling to obtain powdery quaternary fluoride eutectic salt; and mixing the quaternary fluoride eutectic salt with magnesium oxide of which the mass is 0.8-1.2 times that of the quaternary fluoride eutectic salt, carrying out third calcination treatment at 400-600 DEG C for 3-5 hours, and then rapidly cooling and crushing. By adding the high-atomic-number cation salt, the fluorine ion transference number of the fused salt is improved, the multi-element eutectic salt is obtained, the salt melting point is reduced, the working temperature range of the fluorine ion thermal battery is widened, and the specific energy of the battery is improved.

The present application relates to the technical field of wastewater treatment, and specifically discloses a method for recycling fluorine from copper smelting flue gas, which comprises the following steps: adding water glass with a certain concentration into flue gas scrubbing liquid in a certain proportion, obtaining waste acid original solution by power wave scrubber, adding potassium permanganate into the waste acid original solution, obtaining transformation slag and post-transformation liquid, adding water and alkaline compounds into the transformation slag for hydrolysis, obtaining neutralization liquid, adding oxidizing agent and reducing agent into the neutralization liquid, obtaining purification slag and post-purification liquid, obtaining crude potassium fluoride crystal by concentrating and crystallizing the post-purification liquid, and obtaining refined potassium fluoride crystal and post-recrystallization liquid by recrystallizing the crude potassium fluoride crystal. The method can recycle most of the fluorine-containing pollutants in the copper smelting flue gas, and convert them into potassium fluoride, an important industrial product, which not only solves the corrosion of fluorine to process equipment and the pollution to the environment, but also greatly improves the economic benefits of enterprises.

The invention discloses a preparation method of high-purity 2-fluoroethanol, and particularly relates to the technical field of preparation of 2-fluoroethanol, which comprises the following steps: S1, in a dual-catalyst system consisting of a phase transfer catalyst and a Lewis acid catalyst and an organic solvent, carrying out fluoridation reaction on 2-chloroethanol and anhydrous potassium fluoride at 60-120 DEG C for 2-10 hours to obtain 2-chloroethanol; and S2, sequentially carrying out integrated purification of filtration, reduced pressure distillation, adsorption treatment and rectification on the reaction mixture. According to the invention, through synergistic activation and mass transfer of double catalysts, the reaction rate and selectivity are significantly improved, the water segregator is utilized to remove reaction water to push equilibrium movement, the conversion rate is improved, and water and impurities are systematically removed by virtue of composite adsorption and precise rectification of molecular sieves and activated carbon, so that high-quality 2-fluoroethanol with high purity and low moisture is finally obtained. The whole preparation process is mild in condition, high in yield, good in safety and suitable for industrial production.

The utility model relates to a low vibration receiving hopper for discharging potassium fluoride, which comprises a hopper body, the upper end of the hopper body is communicated with a feeding pipe, the lower end of the hopper body is provided with an outlet, the low vibration receiving hopper further comprises a buffer structure, and the buffer structure comprises a buffer disc and a positioning plate. The positioning plate is transversely and fixedly arranged in the middle of the hopper body, the buffer disc is transversely arranged and located above the positioning plate, the buffer disc is correspondingly arranged below the communicating position of the feeding pipe and the hopper body and longitudinally arranged in the hopper body in a sliding mode, a spring is arranged between the buffer disc and the positioning plate, and the spring drives the buffer disc to move upwards. The utility model aims to solve or at least alleviate the problems of dust raising and blockage of potassium fluoride particles at the position of the receiving hopper, and provides the low-vibration receiving hopper for discharging potassium fluoride.

The application provides a preparation method of fluoroethylene carbonate. The method comprises the following steps: uniformly mixing potassium fluoride, a novel solid base catalyst and an organic solvent, then adding chloroethylene carbonate to perform fluorination reaction; after the reaction is completed, the obtained reaction liquid is filtered and distilled to obtain a crude product, and the obtained crude product is subjected to rectification and crystallization to obtain fluoroethylene carbonate; the novel solid base catalyst is composed of a magnesium-aluminum composite oxide coated magnetic nano Fe3O4 carrier and a double-metal fluoride, and the double metal in the double-metal fluoride is a combination of Rb and Co. Compared with the prior art, the application has the following prominent points: (1) less solvent can be used for reaction, and the reaction condition is mild; (2) high selectivity, high activity, less side reaction and high product yield; (3) simple post-treatment, the solvent can be recycled after being evaporated, the generation of three wastes is less, and the industrial production is green and environmentally friendly.

The invention discloses a reagent for removing a chromium-free fingerprint-resistant film layer on the surface of a hot-dip aluminum-zinc steel plate. The reagent mainly solves the problem that the chromium-free fingerprint-resistant film layer on the surface of an existing hot-dip aluminum-zinc steel plate is difficult to remove. According to the technical scheme, the reagent for removing the chromium-free fingerprint-resistant film layer on the surface of the hot-dip aluminum-zinc plated steel plate comprises the following components in percentage by weight: 25%-35% of benzaldehyde, 15%-25% of diethylene glycol monobutyl ether, 5%-10% of trichloromethane, 0.5%-1.0% of ethanol, 5%-8% of OP-10, 10%-15% of potassium fluoride and 20%-30% of water, and the sum of the weight percentages of the components is 100%. The reagent disclosed by the invention is suitable for the chromium-free fingerprint-resistant film layer on the surface of the hot-dip aluminum-zinc steel plate, and the chromium-free fingerprint-resistant film layer takes polyurethane resin, acrylic resin or silane resin as a main body; the reagent is low in volatility and good in using effect.

The present application relates to the technical field of lithium ion battery recycling, in particular to a method for stripping lithium ion battery pole piece and application thereof. The method for stripping lithium ion battery pole piece comprises: immersing the pole piece into a mixed solution containing a stripping agent and a stripping aid for reaction, and obtaining the separated active material layer and the current collector layer after a period of time; the stripping agent comprises a carboxylic acid containing at least two carboxyl groups; the stripping aid comprises at least one of sodium fluoride, potassium fluoride, ammonium fluoride, phosphoric acid, sodium phosphate, monosodium phosphate, sodium metaphosphate, potassium phosphate, monopotassium phosphate, potassium metaphosphate, ammonium phosphate, disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, inositol hexaphosphate and its salt, inositol pentaphosphate and its salt, inositol tetraphosphate and its salt, and inositol triphosphate and its salt. The method can realize the separation of the active material and the current collector, the hydrogen production amount is small during the whole stripping process, the current collector obtained after stripping is intact, the separation time is short, and the separation efficiency is high.

The invention relates to the technical field of metal welding, and discloses a memory alloy welding process, which comprises surface treatment, solder preparation, welding and post-treatment, a matching device comprises a precision positioning clamp, a dynamic gas protection module and an online quality detection system, and the specific operation steps are as follows. And surface treatment: selecting the memory alloy, placing the memory alloy in a high-temperature molten salt bath mixed with chloride (such as copper chloride) and fluoride (such as potassium fluoride), and carrying out chemical cleaning on the surface of the memory alloy. According to the memory alloy welding process, chlorides (such as copper chloride) and fluorides (such as potassium fluoride) are mixed in the high-temperature molten salt bath to perform chemical cleaning on the surface of the memory alloy, an oxidation film is thoroughly removed, meanwhile, impurities are prevented from being introduced, argon is injected into a welding area in the welding process, the welding area is driven to form an oxygen-free state, and the welding quality of the memory alloy is improved. An anaerobic state can be effectively created, and heat input is accurately controlled to maintain the stability of a crystal structure.

Provided is a device for producing an electrolyte solution for fluorine gas production having a low vapor pressure of hydrogen fluoride gas. An electrolyte solution production device (1) is provided with: an anode (3) having a nickel electrode (31) and a carbon electrode (32); a cathode having a metal electrode; and an electrolyte solution production tank (2) capable of accommodating a liquid to be treated (8) containing potassium fluoride and hydrogen fluoride and performing electrolytic treatment of the liquid to be treated (8) using the anode (3) and the cathode (4). The electrolyte solution production device (1) has a configuration capable of applying a direct current to both the nickel electrode (31) and the carbon electrode (32).

The present invention provides a preparation method of (2-fluoro-6-hydroxyphenyl) potassium trifluoroborate. The preparation method comprises the following steps: (1) reacting 3-fluorophenol and chloromethyl ether to obtain a compound shown in Formula I; (2) in the presence of a lithium reagent, reacting the compound shown in Formula I obtained in step (1) with isopropyl alcohol pinacol borate to obtain a compound shown in Formula II; (3) in the presence of an acid, reacting the compound shown in Formula II obtained in step (2) with potassium fluoride to obtain (2-fluoro-6-hydroxyphenyl) potassium trifluoroborate. The preparation process of the present invention does not require the use of a hazardous reagent, boron tribromide, and the yield is also greatly improved, the process is simple, convenient to operate, and is easy to industrialize.

The invention relates to the technical field of welding, in particular to high-corrosion-resistance and high-strength welding flux and a preparation method thereof.The welding flux comprises brazing filler metal and brazing flux, and the brazing filler metal comprises 40-55 parts of aluminum, 12-16 parts of aluminum-silicon alloy, 27-33 parts of copper, 0.5-5 parts of germanium, 0.6-1 part of manganese, 0.2-0.6 part of titanium, 2-5 parts of tin and 0.1-0.5 part of rare earth elements; the brazing flux comprises 25 to 50 parts of potassium chloride, 10 to 35 parts of sodium chloride, 4.0 to 30.0 parts of lithium chloride, 10 to 20 parts of a potassium fluoride-aluminum fluoride compound, 0.5 to 6 parts of zinc chloride, 2 to 6 parts of zinc fluoride, 0.05 to 3 parts of sodium fluoride, 0.05 to 3 parts of lithium fluoride, 0.05 to 2 parts of potassium hexafluorosilicate and 0.05 to 1.5 parts of potassium bifluoride. According to the welding flux, through mutual cooperation of the brazing filler metal and the brazing flux, the strength, corrosion resistance and stability of a welded joint are jointly improved.