34 results about "Oxoacid" patented technology

The present invention relates to the use of at least one oxoacid reducing element, and optionally a salt of the oxoacid reducing element, in a molten chloride fuel salt for a molten-salt nuclear fission reactor (MSR). The present invention also relates to a process of nuclear fission within a molten-salt nuclear fission reactor (MSR), said process being characterized in that it is carried out within the MSR reactor, placed in which is an oxoacid reducing element, and optionally a salt of the oxoacid reducing element. The present invention further relates to a molten-salt nuclear fission reactor (MSR) comprising a molten chloride fuel salt, and a mixture comprising the aluminum metal, and its oxidized form, as an oxoacid reducing element, and optionally a salt of the oxoacid reducing element.

This invention discloses a method for preparing ZSM-5 molecular sieves using a microwave-assisted method with desilication solution, comprising the following steps: First, pretreatment of the desilication solution: the desilication solution is mixed with an oxyacid to adjust the pH to 9-11.5, a template agent is added and mixed evenly to obtain an initial gel; Second, preparation of the ZSM-5 molecular sieve: the initial gel obtained in the first step is placed in a microwave synthesizer for aging with high-speed stirring; the aged solution undergoes a crystallization reaction, followed by filtration, washing, drying, and high-temperature calcination to obtain the ZSM-5 molecular sieve. This invention uses desilication solution as a raw material to prepare ZSM-5 molecular sieves, saving material costs and providing a new approach for the high-value utilization of desilication solution. Furthermore, by utilizing microwave-assisted synthesis on the basis of the traditional hydrothermal method, the time cost is effectively shortened.

The purpose of the present invention is to provide a technique whereby the decomposition of a surfactant can be greatly suppressed without adding a stabilizer. The problem is solved by a method for suppressing decomposition of a surfactant in a cleaning solution for aluminum or an aluminum alloy, the cleaning solution containing an inorganic acid, iron ions, and 0.1-10 g / L of the surfactant, the cleaning solution having a pH of 2 or less. The method includes a step of adding one or more oxoacid salts selected from the group consisting of monooxygenated acid salts and diooxygenated acid salts to the cleaning solution.

This invention belongs to the field of oxyacid synthesis technology of phosphorus, specifically relating to a method for producing phosphorous acid. The production method includes: (1) adding a metal precursor, organic ligand, reaction promoter, structure directing agent and swelling resistant agent to a pore-forming agent and heating to react, to obtain a mixture; then mixing the mixture with a polymer monomer, crosslinking agent and initiator to obtain an oil phase for later use; mixing a dispersant with water and removing oxygen to obtain an aqueous phase for later use; (2) mixing the oil phase and the aqueous phase to carry out a crosslinking reaction to obtain a crude product; (3) washing, acidifying and vacuum drying the crude product to obtain a porous polymer carrier; (4) after the porous polymer carrier swells in water, adding phosphorus trichloride to it, carrying out a heat preservation reaction, and post-treatment to obtain phosphorous acid. This invention improves the production efficiency of phosphorous acid while ensuring a high yield of phosphorous acid by preparing a porous polymer carrier and using it as a medium for the hydrolysis of phosphorus trichloride to prepare phosphorous acid.

The present invention relates to a method of adjusting the oxoacidity of a molten metal hydroxide salt, the method comprising the steps of: estimating a target concentration of at least one of H2O, O2—, and OH— in a molten salt of a metal hydroxide; providing an oxoacidity control component; and contacting the oxoacidity control component with the molten salt of a metal hydroxide to adjust the oxoacidity of the molten salt of a metal hydroxide. The method allows better utilisation of the available temperature range for a molten salt of a metal hydroxide by reducing the corrosive nature of the metal hydroxide.

The present invention relates to a method for obtaining a bath of molten chloride salts comprising at least one actinide in which the oxidation state and / or degree of oxidation of said at least one actinide are predetermined according to the intended application, comprising the following steps: (a) establishing, for said at least one actinide, its potential-oxoacidity diagram at a given temperature T in a bath of molten chloride salts, (b) from the potential-oxoacidity diagram established in step (a), defining the potential-oxoacidity domain in which said at least one actinide is in the predetermined oxidation state and / or degree of oxidation, (c) selecting at least three different compounds which are different from said at least one actinide setting, at the temperature T, the potential and oxoacidity of the bath of molten chloride salts in the domain defined in step (b), it being possible for one of said at least three compounds to be the chloride ion contained in the bath of molten chloride salts, then (d) introducing, into a bath of molten chloride salts comprising said at least one actinide at the temperature T, said at least three compounds selected in step (c). The present invention relates to the use of various mixtures or compositions in the preparation of a nuclear fuel, during its operation or else during its reprocessing.

This invention relates to the field of organic synthesis and discloses a method for preparing bifenthrin. The method includes: contacting kungfu acid and 2-methyl-3-phenylbenzyl alcohol in the presence of a catalyst composition to carry out an esterification reaction; wherein the catalyst composition includes component A and component B; wherein component A is selected from oxyacid esters of group IVB elements and / or compounds formed by group IVB elements and alcohols; wherein component B is selected from at least one of inorganic salts of copper, oxides of copper, oxides of tin, and inorganic salts of tin. The bifenthrin prepared by this method has a high yield (>98%), high purity (up to 99.4%), and produces fewer bifenthrin isomers (<0.5%), meeting market requirements. The entire process is highly efficient and environmentally friendly.

This invention provides a high-temperature stabilizer for sulfonated drilling fluids, its preparation method, and its application. The stabilizer comprises low-valent sulfur oxyacid salts and hydroxyalkyl sulfonates. The high-temperature stabilizer for sulfonated drilling fluids is prepared according to the following steps: mixing low-valent sulfur oxyacid salts and carbonyl compounds in water, adding an inorganic alkali to adjust the pH to 8-10, and reacting under high-temperature sealed conditions to obtain the high-temperature stabilizer for sulfonated drilling fluids. The low-valent sulfur oxyacid salts include divalent sulfur oxyacid salts and / or tetravalent sulfur oxyacid salts; the carbonyl compounds include aldehydes and / or ketones; the molar ratio of sulfur in the low-valent sulfur oxyacid salts to the carbonyl groups in the carbonyl compounds is (1.2-2.0):1. The high-temperature stabilizer in this invention is a composition formed by low-valent sulfates and hydroxyalkyl sulfonates. This composition can simultaneously eliminate the active hydroxymethyl and hydrogen atoms on the phenolic ring structure of the sulfonated material and can also inhibit the desulfonation reaction of the treatment agent.

The invention discloses an isocyanate curing agent, which is prepared from the following components in parts by weight: 100 parts of isocyanate, 0.03 to 0.11 part of oxyacid polymerization inhibitor, 8 to 35 parts of ester organic compound solvent and 0.10 to 0.16 part of polyol ester modifier. According to the isocyanate curing agent disclosed by the invention, a proper amount of oxyacid is added as a polymerization inhibitor, so that the self-polymerization reaction of isocyanate can be effectively inhibited; a chemical environment for inhibiting reaction with water can be established in an isocyanate system, so that the isocyanate and the water are effectively prevented from chemical reaction, the generation of carbon dioxide gas is reduced, the defects of bubbles, bubbling and the like of a product are avoided, and the appearance quality of the product is improved. The isocyanate curing agent disclosed by the invention is applied to casting production of steel castings, and the mechanical property, the curing property and the like are obviously improved. In the actual molding process, compared with an unmodified isocyanate curing agent, the isocyanate curing agent disclosed by the invention has the advantages that the molding sand strength is improved by more than 10%, and the sand mold curing and drawing time is shortened by about 15%.

This invention relates to the field of battery technology, specifically to a lithium iron phosphate (LFP) cathode material and its preparation method, cathode sheet, battery, and power device. The LFP cathode material comprises: active particles, each containing a core of lithium iron phosphate; a first coating layer covering the surface of the core, and a second coating layer covering at least a portion of the surface of the first coating layer; wherein the first coating layer comprises a bismuth-based oxyacid salt, and the second coating layer comprises a platinum-based compound. The LFP cathode material of this invention, by sequentially providing a first coating layer containing a bismuth-based oxyacid salt and a second coating layer containing a platinum-based compound on the core of lithium iron phosphate, can effectively improve the ionic and electronic conductivity of the LFP cathode material under extreme low-temperature conditions, thereby improving its discharge capacity, cycle life, and rate performance.

The invention relates to the technical field of corrosion protection, in particular to an aluminum alloy surface pretreatment method based on corrosion inhibitor impregnation reaction, which comprises the following steps: before growing an LDH film layer, immersing an aluminum alloy in an oxyacid salt corrosion inhibitor solution for pretreatment to generate a protective film on the surface so as to reduce the potential difference between different areas on the surface of the aluminum alloy; more uniform electrochemical distribution is promoted, so that compact and uniform growth of a subsequent Zn-Al-LDH film layer is promoted. The corrosion inhibitor reacts with metal cations generated by dissolving active IMC on the surface of the aluminum alloy to form a protective film, the protective film covers the IMC, the potential uniformity of the surface of the aluminum alloy is improved, the defects of a generated LDH film layer are reduced, the quality is improved, and the corrosion resistance is improved.

This invention discloses a method for using metal oxyacid anions to inhibit chlorine corrosion of metals and its application. Specifically, it discloses a novel use of metal oxyacid anions to alleviate the chemical or electrochemical corrosion of metals by chlorine-containing solutions. In this invention, metal oxyacid anions form polymetallic oxyacid anion clusters during electrolytic or electrochemical corrosion, revealing that these clusters possess specific chemical adsorption properties on the surface of metal electrodes or metal substrates, and exhibit strong resistance to chlorine corrosion. ‑ The electrostatic repulsion and steric hindrance effects of the Cl- at the interface can reduce the interfacial Cl- ‑ The concentration can thus alleviate chlorine corrosion of metals and extend the service life of metal materials in chlorine-containing environments.

The invention relates to a method for reducing nitrate in waste water, and the method comprises the following steps: adding a first reducing agent into the waste water, and adjusting the pH value of the waste water to 6.5-7.5 to obtain waste water to be treated; carrying out contact catalytic reduction reaction on the wastewater to be treated and a catalyst; wherein the first reducing agent comprises oxysalt of sulfur; the catalyst comprises a carrier and an active component loaded on the carrier, the active component comprises an iron element and a noble metal element, and the noble metal element is one or more of ruthenium, palladium and tin. The method disclosed by the invention is simple and easy to implement, mild in operation condition, free of an oxygen-free environment and limitation of an over-high or over-low pH value, relatively high in tolerance to the content of organic matters in the wastewater and salinity, and high in removal rate of nitrate.

The invention discloses a method for reducing the viscosity of a zinc salt treatment system slurry single aluminum coating. The method comprises the following steps: grinding a titanium dioxide kiln product treated by depolymerized zinc oxide salt, adding a dispersing agent in a pulping process before wet grinding, and carrying out wet grinding including ball milling and sanding; pre-treating the wet-ground slurry, adding oxyacid and salt compounds of silicon and a precipitant into a coating tank in a parallel flow manner, and generating a silicon precipitate on the surface of titanium dioxide; and carrying out aluminum oxide inorganic coating on the pretreated titanium dioxide slurry. According to the scheme, the method comprises a pretreatment step carried out before single aluminum coating, and silicon precipitates are generated on the surface of titanium dioxide. The method can solve the problem of stirring failure caused by overhigh slurry viscosity in the single aluminum coating process of titanium dioxide in a zinc salt treatment system in the prior art.

The invention belongs to the technical field of electrochemical wastewater treatment, and relates to a Sm diatomic electrocatalyst, a preparation method thereof and a method for treating oxysalt wastewater. The catalyst takes nitrogen-doped carbon as a carrier, and Sm-Sm diatomic sites are anchored in a carbon skeleton in an atomic scale manner through Sm-N coordination. The preparation method comprises the following steps: self-assembling Sm2O3 and a nitrogen-containing organic matter in a buffer solution to obtain a precursor, carrying out high-temperature carbonization in an inert atmosphere, and then carrying out acid etching to remove redundant oxides so as to obtain the high-density Sm diatomic site. The catalyst is loaded on a conductive substrate as a cathode, and negative potential is applied to an aqueous solution containing nitrate, bromate and / or perchlorate, so that the nitrate can be efficiently reduced into nitrogen, the bromate and the perchlorate are reduced into corresponding halide ions, and the catalyst is prepared. The catalyst has the advantages of hydrogen evolution reaction inhibition, high oxysalt removal rate, good target product selectivity, excellent stability and the like.

The application provides a high-temperature durable organic silicon defoaming composition, which comprises alkyl polysiloxane, phenylsiloxane, fluorine-containing siloxane, hydrophobic modified silicon dioxide, an antioxidant and a dispersant; various groups, such as alkyl, benzene rings and fluorine-containing groups, are introduced into the side chains of the polysiloxane; in the defoaming composition, the introduction of the phenylsiloxane makes the molecular structure more stable, the defoaming composition can keep low volatility and excellent chemical stability under high-temperature conditions; the fluorine-containing groups further enhance the thermal stability of the polysiloxane at the molecular level, reduce the surface energy and increase the adhesion capacity of the defoaming agent at the gas-liquid interface. The optimized combination of the modified groups, the dispersant and the antioxidant endows the defoaming agent with strong oxidation resistance and chemical resistance, and the defoaming agent can also work stably in a production environment with strong oxygen, acidity or alkalinity.

The invention belongs to the technical field of oxygen-containing acid synthesis of phosphorus, and particularly relates to a phosphorous acid evaporation and concentration process. According to the phosphorous acid evaporation and concentration process, a phosphorous acid crude product is treated by an evaporation and concentration system to obtain a phosphorous acid finished product; wherein the evaporation and concentration system comprises a first-stage falling film evaporator, a second-stage falling film evaporator and a third-stage falling film evaporator which are connected in sequence, auxiliaries are added from the third-stage falling film evaporator, and the auxiliaries comprise polyethylene glycol diamine, N, N-diethyl hydroxylamine and sodium octyl sulfosuccinate. According to the invention, the evaporation and concentration system is designed and the auxiliary agent is supplemented, so that the residual quantity of hydrogen chloride in the phosphorous acid crude product is further reduced, the high-purity phosphorous acid finished product is prepared, and the phosphorous acid finished product can be used in the fields with high purity requirements, such as semiconductor wafer cleaning agents.

The present disclosure discloses a chlorine-nitrogen co-coordinated single-atom zirconium adsorbent and use thereof in selective fluoride removal from high-salinity wastewater, belonging to the technol field of fluoride-containing wastewater treatment. The present disclosure involves the self-assembly of melamine and cyanuric acid to obtain a supermolecule, followed by ball milling of the supermolecule with zirconium chloride and subsequent pyrolysis twice to obtain the chlorine-nitrogen co-coordinated single-atom zirconium adsorbent. The adsorbent achieves selective capture of low concentrations of fluoride ions in the high-salinity wastewater by exerting strong electrostatic repulsion on oxygen-containing acid radicals by negatively charged nitrogen ligands and exerting strong coordination on fluoride ions by positively charged zirconium atoms.

This invention discloses a method for preparing a bismuth-based material and its application in the treatment of iodine-containing wastewater. The bismuth-based material is a bismuth-based oxoacid salt material and / or a bismuth-based oxoacid salt composite material; the bismuth-based material is used to remove iodide ions and iodate ions from iodine-containing wastewater. This invention provides a method for the simultaneous and efficient removal of iodide ions based on bismuth-based oxoacid salt materials and / or bismuth-based oxoacid salt composite materials. ‑ and IO3 ‑ The proposed method for treating iodine-containing wastewater has advantages such as high treatment efficiency, large adsorption capacity, high efficiency in removing iodine-containing wastewater of different concentrations, strong resistance to interference from coexisting anions, and a wide applicable pH range. The bismuth-based material of this invention exhibits good stability, is safe to use, and poses no risk of secondary pollution.

The invention discloses a method for preparing benzophenone aromatic hydrocarbon by directly oxidizing diphenylmethane aromatic hydrocarbon, which comprises the following steps: mixing a reaction substrate, a reaction solvent, a main catalyst and a cocatalyst to obtain a reaction raw material, introducing the reaction raw material into an oxidation reactor, heating to a reaction temperature under the protection of nitrogen and / or inert gas, and reacting for 1-2 hours to obtain the benzophenone aromatic hydrocarbon. Introducing oxygen-containing gas to carry out oxidation reaction to obtain benzophenone aromatic hydrocarbon; the main catalyst comprises a transition metal salt; the cocatalyst is one or more of alkali metal halide, alkaline earth metal halide and nonmetal oxyacid; and the oxidation reactor is a bubble tower oxidation reactor provided with a jet flow gas-liquid mixer. By optimizing the reactor and the catalytic system, the efficiency of the oxidation reaction process and the yield of the benzophenone aromatic hydrocarbon are remarkably improved, and the method has the universality of preparing the benzophenone aromatic hydrocarbon by oxidizing the diphenylmethane aromatic hydrocarbon.

The application relates to a low-temperature sulfur-resistant denitration catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gas purification. The preparation method comprises the following steps: soaking NS-HPC in acid liquor to obtain modified NS-HPC; impregnating the modified NS-HPC in a molybdenum source solution; then, preparing a mixed solution of a cerium source, a manganese source and a cobalt source, and impregnating the material in the mixed solution; and then, calcining the impregnated material under a protective atmosphere at 250-300 DEG C for 2-4 hours, and then calcining the impregnated material under an oxidizing atmosphere at 350-450 DEG C for 10-20 minutes. The catalyst adopts acid liquor to introduce oxygen-containing acidic functional groups in the inner wall of micropores, then makes Mo species preferentially anchor in the defect sites and part of the mesopores of the carrier, then loads cerium, manganese and cobalt in the second impregnation, then makes the metal nitrate decompose into oxides, and then calcines at a higher temperature for a short time to form a stable composite oxide structure. After long-time operation under a high-sulfur atmosphere, the catalyst has extremely small activity attenuation.

The invention discloses a hollow nanocage hydrogen evolution catalyst with an ordered three-dimensional structure of ultrathin nanosheets rich in metal / oxide interfaces and a preparation method of the hollow nanocage hydrogen evolution catalyst. The preparation method comprises the following steps: directly preparing a metal hydroxide-organic ligand compound with nanorod morphology through an aqueous solution; carrying out secondary hydrothermal preparation to obtain a hollow metal oxysalt hollow nanocage compound; and finally, carrying out controllable reduction to obtain the electrolytic water hydrogen evolution catalyst rich in the metal / oxide interface. The water electrolysis hydrogen evolution catalyst prepared by the method has a nanocage structure formed by vertically and orderly stacking ultrathin nanosheets, is large in specific surface area, high in electrocatalytic activity and good in stability, and has very high industrial application value.

The application relates to a C3 direct oxidation acrylic acid multi-metal oxide catalyst and a preparation method thereof. The application discloses a modification strategy of acid treatment of a catalyst precursor. Specifically, in the preparation stage of the catalyst precursor, a specific oxygen-containing acid (such as boric acid, selenic acid, phosphoric acid or sulfuric acid) solution containing Y elements is introduced into a mixed metal salt solution system to form a uniform slurry under heating and stirring. The acidic environment plays a role in dissolving and dispersing and cooperatively controls the hydrolysis-condensation process of the precursor. After one of rotary evaporation, freeze-drying, spray drying and hydrothermal methods is performed, the catalyst is obtained through calcination. The catalyst is applied to the preparation of acrylic acid through C3 direct oxidation. The propane conversion rate is 55-75%, the propylene conversion rate is 75-85%, and the acrylic acid selectivity is 85-95%. The catalyst prepared by the method has high catalytic activity and good selectivity.

This invention discloses a method for preparing a NaNbO3 / Co3O4 electrocatalyst for the acidic oxygen evolution reaction (OER) and its application, belonging to the field of electrochemical energy conversion and catalytic materials. The preparation method includes: selecting cobalt oxyacid salts and sodium niobate as metal sources; mixing a complexing agent with deionized water at a predetermined molar ratio; adjusting the pH; and heating and stirring to form a metal complex sol; followed by hydrothermal treatment, ultrasonic cleaning, centrifugation, drying to form a gel, and high-temperature calcination to obtain the NaNbO3 / Co3O4 electrocatalyst. The application method includes: pretreating titanium felt and loading the catalyst to obtain a working electrode; constructing a three-electrode electrolysis system; realizing the acidic OER through electrochemical testing; and also applying the catalyst to a PEM water electrolysis hydrogen production system. This invention achieves molecular-level uniform composite through the sol-gel method, optimizes the electronic structure and stability of the catalyst, and provides a controllable and repeatable preparation process suitable for large-scale production, offering a high-performance, low-cost non-precious metal catalytic solution for acidic water electrolysis hydrogen production.

The invention provides an anion-doped ruthenium oxide bifunctional catalyst as well as a preparation method and application thereof, belongs to the technical field of electro-catalysis water splitting, and is used for solving the technical problem that a ruthenium oxide-based catalyst is difficult to realize efficient OER and HER reactions at the same time in a wide pH range. Anions in the anion-doped ruthenium oxide bifunctional catalyst exist in the form of oxyacid radical ions, and the preparation method of the anion-doped ruthenium oxide bifunctional catalyst comprises the following steps: dispersing and dissolving a ruthenium source, a doping element compound and a chelating agent into a solvent to prepare a precursor solution, and performing thermal reaction to prepare a ruthenium oxide precursor; and calcining the ruthenium oxide precursor to prepare the anion-doped ruthenium oxide bifunctional catalyst. The doping element compound is a sulfur source, a phosphorus source or a selenium source. The catalyst disclosed by the invention is applied to a proton exchange membrane electrolytic cell, shows relatively low polarization voltage (the voltage is only 1.63 V under 1A cm <-2 >), can stably run for 100 hours at 300mA cm <-2 >, realizes no Pt / Ir of cathode and anode catalysts, reduces the cost of the catalyst, and shows a good application prospect.

The invention relates to crystallizer casting powder and application thereof. The crystallizer casting powder is applied to the surface of molten steel in a crystallizer. The casting powder comprises the following chemical components in percentage by mass: 35.08% to 39.08% of CaO, 24.08% to 28.08% of SiO2, 0.31% to 0.51% of Li2O, 6.08% to 8.08% of Na2O, 8.33% to 10.9% of F, 2.36% to 3.36% of Al2O3, 0.55% to 1.15% of MgO, 0 to 0.8% of Fe2O3, 3.45% to 5.45% of solid C and the balance of inevitable impurities, and the sum of the mass of carbonate and the mass of oxysalt in the crystallizer casting powder is less than or equal to 5%. According to the crystallizer casting powder, rapid heat transfer in a crystallizer is facilitated, heat transfer uniformity is guaranteed, effective lubrication is achieved, bonding breakout is reduced, alarming is conducted, and continuous and stable production and the surface quality of a continuous casting blank are both considered.

This invention provides a method for extracting scandium from red mud using an acid-salt synergistic extraction technique, belonging to the field of rare earth metal extraction and recovery technology. This invention employs an acid-salt synergistic extraction strategy, introducing sulfate ions from the salt to convert the insoluble isomorphous scandium into water-soluble scandium sulfate, which can then be leached with water, significantly reducing acid consumption and increasing the scandium leaching rate. The salt used in this invention is a sulfur-containing oxyacid sodium salt; sodium ions effectively solidify impurities such as Al and Fe in the mineral lattice, thereby improving the purity of the scandium leachate. This extraction method uses small amounts of sulfur-containing oxyacid sodium salt and concentrated sulfuric acid, making it environmentally friendly; the weak acidity of the leachate greatly reduces the consumption of alkali in the subsequent scandium extraction and impurity removal process, significantly lowering the scandium extraction process cost and making it suitable for industrial application.

The invention belongs to the technical field of copper electrolytic refining, and particularly relates to a method for preparing ultra-high-purity copper through ultrasonic-assisted electro-deposition and the ultra-high-purity copper. The method comprises the steps that a cathode and an anode are immersed in electrolyte, electro-deposition is carried out under the ultrasonic-assisted condition, and electrolytic copper is obtained on the cathode; the electrolytic copper is cleaned and dried, and ultra-high-purity copper is obtained; the electrolyte comprises water-soluble copper salt, oxyacid, deionized water and inorganic additives, wherein the inorganic additives comprise hydrochloric acid and hydrogen peroxide. According to the method, an inorganic additive and ultrasonic synergistic strengthening effect is adopted, no organic additive is needed, a diffusion boundary layer is broken through the cavitation effect and the acoustic streaming effect of ultrasonic waves, uniform deposition of copper ions and efficient separation of impurities are achieved, the 7N-grade ultra-high-purity copper is prepared, meanwhile, production energy consumption and cost are considered, and the method is suitable for industrial production. And the high-end requirements of the fields of electronic information, aerospace and the like on the ultrahigh-purity copper are met.

The invention relates to the field of waste lithium battery recovery, and discloses a molten salt which comprises oxysulfate and a urea compound, in the molten salt, the molar ratio of the oxysulfate in terms of acid radical to the urea compound in terms of ureido is (1-10): 1. The molten salt comprises oxysulfate and a urea compound, the lithium extraction rate of the positive electrode material is high through synergism of the oxysulfate and the urea compound, the purity of the obtained lithium salt product is high, and the consumption of the oxysulfate and the roasting temperature during recovery of the waste lithium battery can be reduced.

The invention discloses an amorphous metal hydroxide and a preparation method and application thereof.The preparation method comprises the steps that firstly, a nucleation reactor is used for rapid nucleation, a metal salt solution and an oxyacid radical solution are co-precipitated, and an amorphous precursor is obtained; and carrying out anion exchange treatment to finally obtain the amorphous metal hydroxide catalyst with the long-range disordered structure. The method provided by the invention has the characteristics of simple, continuous and controllable process, no need of high-temperature calcination, low energy consumption and large-scale preparation of the catalyst, and the amorphous metal hydroxide catalyst prepared by the method has excellent catalytic activity and structural stability; in addition, the catalyst has excellent selectivity and Faraday efficiency in an oxidation reaction of coupling electrolyzed water with 5-hydroxymethylfurfural.