1764 results about "Sequestering Agent" patented technology

The invention relates to a method for continuously producing 1, 1, 1, 3-tetrachloropropane, which comprises the following steps: adopting a loop reactor in which a beam pipe is arranged in the reactor, mixing reaction raw materials ethylene and carbon tetrachloride at a Venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and spraying into the reactor filled with a main catalyst. A cocatalyst and a chelating agent are added into a carbon tetrachloride raw material in advance, are pumped into a liquid loop by a feeding pump and then enter a reactor. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. By adopting the method disclosed by the invention, the selectivity and the production efficiency of the 1, 1, 1, 3-tetrachloropropane can be greatly improved, and the method also has the advantages of simplicity in operation, environment friendliness, long service life of the catalyst and low cost.

A compound or molecular complex. The compound or molecular complex comprises: a metal chelator configured for chelation with a radioactive isotope or a non-radioactive isotope; and a trifluoroborate (BF3)-containing moiety configured for 19F / 18F exchange or a precursor thereof; and optionally a cell-targeting domain.

The invention discloses a soil heavy metal chelating agent, the chelating agent comprises a chelating agent I and a chelating agent II, the chelating agent I is composed of fly ash and domestic sludge, and the chelating agent II is a modified sodium alginate compound; the mass ratio of the chelating agent I to the chelating agent II is (15-20): (3-5). According to the invention, the chelating agent I is composed of the fly ash and the domestic sludge, the modified sodium alginate compound is used as the chelating agent II, and the two chelating agents are cooperatively used in the soil reclamation of the strip mine dump, so that a series of environmental problems caused by mining activities can be effectively improved, and the reasonable utilization of land resources is promoted.

The invention relates to a process for recycling and regenerating a waste lithium iron phosphate positive electrode material by using a specific chelating agent. The method comprises the following steps: carrying out heat treatment on a waste lithium iron phosphate positive electrode material, putting separated waste lithium iron phosphate powder into a ball milling tank, adding organic acid and a chelating agent, and carrying out ball milling; after the ball milling is finished, adding hydrogen peroxide, uniformly stirring and mixing, adjusting the pH value to 2-3 by using nitric acid, and filtering to obtain a filter cake which is iron phosphate; adding saturated sodium carbonate into the filtrate, precipitating, and recovering lithium carbonate; putting the iron phosphate, the lithium carbonate, the iron source, the lithium source and the phosphorus source in the step S3 into a ball mill for ball milling, and performing high-temperature solid-phase sintering after ball milling to obtain a regenerated lithium iron phosphate material; the chelating agent disclosed by the invention is prepared from (9ci)-2-(2-propenyl)-1-cyclopentene-1-carboxylic acid, 2-mercaptobenzimidazole carboxylic acid, an ethylene boric anhydride pyridine complex and potassium persulfate. The regenerated lithium iron phosphate material prepared by the method has excellent electrochemical performance.

This application discloses a detergent tablet free of SLS surfactant and its preparation method. The detergent tablet includes a film-forming agent, an anionic surfactant, a non-ionic surfactant, a chelating agent, an enzyme preparation, an auxiliary agent and a essence. The film-forming agent includes one or more of polyvinyl alcohol, cellulose, and dodecenyl succinate starch ester. The anionic surfactant includes at least two of sodium α-olefin sulfonate, sodium fatty acid methyl ester sulfonate, and sodium hydroxyethyl sulfonate. The non-ionic surfactant includes at least two of fatty alcohol polyoxyethylene ethers, fatty acid methyl ester ethoxylate, and oil ethoxylate.

The invention relates to the technical field of developing, in particular to a high-selectivity developing solution for alkali-soluble photoresist and a developing process. The problem that the developing effect and the dissolving effect are poor in the developing process is solved. The developing solution is prepared from the following synthetic raw materials: a modified active agent, a weakly alkaline mixture, a modified defoaming agent, a composite dispersing agent, an improved chelating agent, an organic solvent and deionized water. According to the invention, the dissolution rate of the unexposed photoresist is improved by preparing the modified active agent and the weakly alkaline mixture, and the high selectivity of the developing solution is embodied; the defoaming performance of the developing solution is improved by preparing the modified defoaming agent and adding the composite dispersing agent; the developing effect of the material can be improved through the synergistic effect of the improved chelating agent and the organic solvent in the developing solution; the developing solution is applied to the developing process, and the pH value and process parameters are adjusted, so that the developing effect and efficiency of the material are improved.

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

A method for synthesizing a zirconium complex includes: mixing a solvent containing an organic substance having a dipole moment of 3.0 D or more, a chelating agent solution in which a chelating agent containing a structure represented by General Formula (1) or General Formula (2) is dissolved, and zirconium dissolved in an acidic solution, to obtain a mixed solution; and setting the mixed solution at a predetermined temperature or more to synthesize a zirconium complex.

The invention relates to the technical field of welding cleaning agents, in particular to an aluminum alloy welding cleaning agent and a preparation method and application thereof. The aluminum alloy welding cleaning agent comprises the following raw materials in parts by mass: 10-20 parts of organic acid, 1-3 parts of modified silicon dioxide, 0.1-0.5 part of a chelating agent, 1-2 parts of an acidic dispersant, 2-5 parts of a corrosion inhibitor, 1.1-3 parts of a penetrant, 5-10 parts of a defoaming agent and 60-100 parts of water. The cleaning agent is reasonable and scientific in formula, simple to prepare, free of special equipment, high in cleaning capacity, capable of achieving an excellent cleaning effect at low temperature, short in time, good in working efficiency and extremely high in cleaning efficiency on oil stains on metal surfaces, especially aluminum alloy surfaces, and the corrosivity is obviously reduced.

The invention discloses a sodium ferric pyrophosphate material with a sodium storage dominant crystal face regulated and controlled by cation doping as well as a preparation method and application of the sodium ferric pyrophosphate material. The chemical formula of the prepared sodium ferric pyrophosphate material with the regulated and controlled crystal structure is Na < 4 > Fe < 2.97 > M < 0.03 > (PO4) < 2 > P < 2 > O < 7 >. Wherein M = Sr, or Sr and a second doping element, and the second doping element is selected from one of Cd, Bi, Mo, Ni and Al. The material is prepared by adopting a sol-gel method, an iron source, a chelating agent, a sodium source, a phosphorus source and doping elements are dissolved in deionized water, and stirring is performed until a gel state is formed; and drying and calcining twice to obtain a final product. The sodium ferric pyrophosphate electrode material prepared by the invention has more sodium storage dominant crystal faces, shows good electrochemical performance, has the advantages of simple preparation process, easily available raw materials and low cost, has remarkable industrial application value, and is easy for large-scale production.

The present disclosure provides a unit dose detergent comprising a water-soluble film material comprising a first compartment that is adjacent to a second compartment and separated by at least one layer of the film. The first compartment encloses a liquid composition comprising a non-aqueous solvent, and the second compartment encloses a powder composition comprising a pigment and at least one additive selected from a salt, a flow aid, acid, enzyme, chelating agent, a polymer, and any combination thereof; such that at least one of the liquid composition and the powder composition comprises a surfactant. Also provided is a method of preparing the powder composition for use in the unit dose detergent. The method includes adding the pigment to a salt to provide a pigment-salt combination and adding a flow aid to the pigment-salt combination to form the powder composition.

The invention relates to a fluorine-containing binder for a sulfide all-solid-state battery and a preparation method and application thereof.The binder is formed by copolymerizing isoprene and lithium perfluorovinyl ether sulfonate, specifically, the lithium perfluorovinyl ether sulfonate, a chelating agent, an emulsifying agent, ferrous sulfate, a reducing agent and an acid-base buffering agent are dissolved in water, cooling is conducted in the inert atmosphere, and the fluorine-containing binder for the sulfide all-solid-state battery is obtained. And adding isoprene, an initiator and a molecular weight regulator, and carrying out polymerization reaction to obtain the fluorine-containing binder. The isoprene can enhance the solubility of the lithium perfluorovinyl ether sulfonate fragment in the non-polar solvent, so that the whole polymer is dissolved in the non-polar solvent; the perfluorovinyl ether lithium sulfonate has a large space proportion of fluorocarbon groups, and has a shielding effect on hydrocarbon groups on isoprene, so that the stability of the whole polymer can be improved. The fluorine-containing binder prepared by the preparation method disclosed by the invention is a binder with high elasticity, high ionic conductivity and high stability.

To provide an efficient separation and recovery method for laminated materials suitable for plastic recycling, which has excellent detachability of the printing layer and adhesive layer, and also suppresses reattachment of components detached from the detached layer, and furthermore, it is to provide a method for manufacturing molding materials obtained by melting and kneading the recovered plastic base materials, and a method for manufacturing high-grade molded bodies obtained by heating and molding the molding materials.SOLUTION: The method for separating and recovering laminates includes the process of immersing a laminate with at least a plastic substrate layer and a desorption layer in contact with the plastic substrate layer in a desorption solution containing a chelating compound and / or chelating agent (except when it is a surfactant) to desorb the desorption layer and recover the plastic substrate.SELECTED DRAWING: None

The invention discloses a method for enriching light metal ions in a pore channel based on carbon nanofiber / carbon fiber nano confinement, and belongs to the technical field of sample pretreatment, and the method comprises the following steps: S1, preparing a carbon nanofiber / carbon fiber confinement material; and S2, putting the carbon nanofiber / carbon fiber confinement material obtained in S1 into a light metal ion solution, and stirring. According to the method for enriching the light metal ions in the pore channel based on the carbon nanofiber / carbon fiber nano confinement, the carbon nanofiber / carbon fiber is used as a confinement fluid carrier, ultrapure water, methanol or n-hexane is used as an extracting agent, a chelating agent does not need to be introduced, the method is green and environmentally friendly, the mass transfer rate is increased, and the method is suitable for large-scale industrial production. Therefore, high enrichment of light metal ions in water is realized.

The invention discloses an ammonia nitrogen detection system and an application method thereof, and ammonia nitrogen detection test paper, the ammonia nitrogen detection system is prepared by the following steps: step SA1) preparing a dipping mixed solution, the dipping mixed solution comprises: a potassium sodium tartrate solution with a concentration of 3-60 g / L; a sodium salicylate solution with a concentration of 20-320 g / L; the concentration of the sodium nitroprusside solution is 0.1 to 0.8 g / L; and deionized water. On the basis of the principle of salicylic acid-pypocholoride spectrophotometry, the impregnated test paper, the reagent tube and the standard colorimetric card are combined, and the rapid ammonia nitrogen detection system special for medium-concentration sewage detection is successfully developed. The toxicity problem of mercury iodide in a Nessler reagent method and the toxicity problem of phenol in a phenol-pypocholoride spectrophotometric method are avoided, main reagents are non-toxic and harmless to a human body, interference of metal ions in a water sample can be effectively eliminated by adopting sodium potassium tartrate tetrahydrate as a chelating agent, and the detection stability and accuracy are improved.

The invention discloses a tooth repair composition containing mesoporous hydroxyapatite, a tooth repair product and a preparation method and application of the tooth repair composition and the tooth repair product. The tooth repair composition comprises nano-hydroxyapatite, fluoride and a chelating agent, the logarithm value logK of the stability constant K of the chelating agent to calcium ions is 1 < = logK < = 5, and K is measured in an aqueous solution with the temperature of 25 DEG C, the pH value of 7.0 and the ionic strength of 0.1 M; the nano-hydroxyapatite is prepared from nano-scale mesoporous hydroxyapatite, and the nano-hydroxyapatite contains nano-scale mesoporous hydroxyapatite. By adding the specific chelating agent, dynamic balance is formed in the tooth repairing composition, slow release protection can be formed on free calcium ions, the double inactivation effect possibly occurring when hydroxyapatite and fluoride exist at the same time is effectively avoided, the synergistic repairing effect of hydroxyapatite and fluoride is fully exerted, and the tooth repairing effect is improved. The use of fluorides can be greatly reduced, and safety and reliability are achieved.

The present invention provides an amino acid cleansing product and a preparation method thereof, and belongs to the technical field of cosmetics. Relative to 100% by mass of the amino acid cleansing product, the amino acid cleansing product is composed of 25-35% by mass of glycerol, 5-20% by mass of diglycerol, 15-35% by mass of amino acid surfactant, 5-10% by mass of non-amino acid surfactant and the remainder of auxiliary components, wherein the auxiliary components are one or more of a neutralizer, a preservative, a chelating agent, a thickener, and deionized water. The amino acid cleansing product of the present invention can improve stability while avoiding increasing production costs, maintaining a refreshing washing feeling and having skin mildness, and the preparation method of the amino acid cleansing product is simple and suitable for large-scale production.

The invention discloses positive electrode slurry for preventing formation of gel and a preparation method of the positive electrode slurry. The method comprises the following steps: S1, drying a positive electrode active material under the protection of inert gas; s2, carrying out surface modification by using a functionalized silane coupling agent; s3, drying the conductive agent under a high-temperature vacuum condition; s4, under the protection of inert gas, lithium alkyl sulfonate, a polyhydric alcohol chelating agent and polyvinylidene fluoride are subjected to a reaction to prepare a modified binder; s5, mixing and dispersing the modified active material, the conductive agent, the modified binder and the acidic buffer agent in a low-dew-point drying chamber; s6, performing ultrasonic treatment on the slurry under a vacuum condition; and S7, adding a cross-linked fluorosilane coupling agent, mixing at a low speed and precisely filtering to obtain the anti-gel positive electrode slurry. According to the invention, through a multi-synergistic anti-gel mechanism, the problem that the positive electrode material slurry is easy to form gel is solved, and the prepared slurry has excellent stability, rheological property and coating performance, so that the electrochemical performance of the battery is improved.

The invention relates to the technical field of bamboo pulp bleaching, and particularly discloses a method for preparing all-chlorine-free bleached bamboo pulp and application. The method adopts a three-section enhanced bleaching process and comprises the following steps: firstly, decomposing lignin under an alkaline condition of 100-115 DEG C through oxygen delignification (Op section); removing transition metal ions by using sulfuric acid and a metal chelating agent with a specific structure by adopting acid pickling chelation (AQ section); and finally, deeply oxidizing the residual lignin in a high-pressure oxygen environment through oxygen enhanced bleaching (Po section). In each stage, hydrogen peroxide is used as a main bleaching agent, sodium hydroxide, sodium silicate and other assistants are matched, and ineffective decomposition of hydrogen peroxide is effectively inhibited through staged pH regulation and a metal chelation technology. The whiteness of the obtained bamboo pulp is larger than or equal to 83% ISO, the kappa number is smaller than or equal to 3.0, and the requirements of high-grade paper products are completely met.

The invention discloses a polishing solution for lithium niobate CMP (Chemical Mechanical Polishing). The polishing solution is prepared from the following raw materials in percentage by weight: 10 to 30 percent of grinding material, 0.1 to 2 percent of dispersing agent, 1 to 3 percent of lubricating agent, 0.1 to 3 percent of chelating agent, 0.5 to 2 percent of surfactant and the balance of water. Through the chemical mechanical polishing solution provided by the invention, the single-sided rough polishing rate of lithium niobate can reach 12 [mu] m / h or above, the optimal single-sided rough polishing rate can reach 20 [mu] m / h, and the optimal surface roughness Sa can reach 0.9 nm or below. According to the lithium niobate rough machining technology, the polishing rate is remarkably increased, and high-precision polishing without surface defects is achieved on the basis of efficient polishing. Compared with the prior art, the method has the beneficial effects that the operation process is simple and convenient, industrialization is easy to realize, the polishing solution is neutral and slightly alkalescent, the universality to equipment is high, and the method is suitable for the field of efficient polishing of lithium niobate.

The present application relates to a chelated iron desulfurizer, which is composed of a high-price soluble iron salt, a chelating agent, a pH buffer and water, wherein the chelating agent is a compound of sodium polyetheramine tetraacetate and at least one of N,N-diethylcarboxylic acid-based ethylenediamino-3-hydroxysuccinic acid, a polycarboxylic acid chelating agent or an amino acid-derived chelating agent; or the chelating agent is a compound of tetrasodium N,N-diethylcarboxylic acid-based ethylenediamino-3-hydroxysuccinic acid and at least one of sodium polyetheramine tetraacetate, a polycarboxylic acid chelating agent or an amino acid-derived chelating agent. Compared with the existing commonly used desulfurizers EDTA or NTA, the chelating ability of the present application's chelated iron desulfurizer is significantly improved, the iron ion regeneration ability is significantly enhanced, and the desulfurization effect is comparable to EDTA or NTA.

The invention relates to the technical field of chemical mechanical polishing, particularly discloses a method for controlling the surface concave-convex rate difference by adopting an abrasive-free copper CMP (Chemical Mechanical Polishing) solution, aims to realize abrasive-free chemical mechanical polishing so as to solve the problem of surface scratch caused by the abrasive action in the polishing process, and is suitable for a substrate polishing solution containing a copper metal layer. The polishing solution comprises a macromolecular chelating agent with the molecular weight of 300-500 g / mol, wherein the optimal molecular weight is 400 g / mol. The alkalescent copper polishing solution prepared by utilizing the macromolecular chelating agent has the advantages that the removal rate of concave parts is low and the polishing rate of convex parts is high through strong chemical reaction under the conditions of no abrasive and no corrosion inhibitor, so that the high-speed difference of the concave parts and the convex parts is generated, and the planarization is realized. Under the condition of alkalescence, no grinding material and no corrosion inhibitor, the polishing solution has high correction capacity on the height difference of the copper surface, and the problems of high polishing pressure, many surface scratches and difficulty in cleaning caused by a traditional method are solved.

The present invention belongs to the technical field of petroleum fracturing production enhancement and modification, and specifically discloses a fracturing fluid pre-fluid for optimizing the size of in-situ autogenous proppant and its application, which is used to solve the problem of small particle size of proppant particles generated by hydrothermal reaction of formation minerals. The fracturing fluid pre-fluid is suitable for calcium-rich reservoirs and is composed of clean water, phosphate, pH regulator and Ca 2+ The chelating agent composition comprises 1 to 10 parts by weight of phosphate relative to 100 parts by weight of clean water, a volume molar concentration of the pH regulator is 1 to 5 mol / L, and Ca 2+ The molar concentration of the chelating agent is 0.001~1mol / L; the pH regulator is urea, ammonia, propionamide, etc. 2+ The chelating agent is EDTA, glutamic acid, etc. The present invention increases the average particle size of proppant particles generated by hydrothermal reaction of formation minerals, thereby improving the supporting effect thereof in micro-fractures of the formation.

The invention discloses application of a hydroxylamine compound cleaning solution. In particular to application of a hydroxylamine compound cleaning solution in cleaning plasma etched and ashed wafers. The hydroxylamine compound cleaning solution is prepared from the following components in percentage by mass: 1 to 30 percent of a hydroxylamine compound, 1 to 5 percent of a corrosion inhibitor, 0.1 to 5 percent of a chelating agent, 0.01 to 5 percent of a nonionic surfactant and 1 to 50 percent of a water-soluble organic solvent and water. The sum of the mass fractions of the components is 100%. The hydroxylamine compound cleaning fluid is safe and environment-friendly, solves the problem of high cost caused by fixed raw material sources, reduces the cost, and is safe and reliable.

The invention relates to the technical field of solder paste, in particular to halogen-free soldering flux for solder paste and a preparation method of the halogen-free soldering flux. The halogen-free soldering flux for the solder paste comprises the following raw materials in parts by mass: 20-40 parts of hydrogenated rosin, 1-5 parts of maleic anhydride, 0.1-0.4 part of p-toluenesulfonic acid, 1-5 parts of activated mesoporous silica, 10-20 parts of a composite organic acid active agent, 5-10 parts of a thixotropic agent, 1-3 parts of a tackifier, 1-2 parts of a pH regulator, 1-2 parts of a surfactant, 1-2 parts of a chelating agent, 1-2 parts of an antioxidant and 50-80 parts of an organic solvent. Through the innovative component design and the preparation process, the technical contradiction existing in the field of halogen-free scaling powder for a long time is effectively solved, and an ideal material solution is provided for high-reliability electronic packaging.

The invention discloses a carbon-based catalyst and a preparation method and application thereof to isomerization of glucose into fructose, the catalyst comprises an active component loaded on a carbon-based catalyst carrier and a chelating agent complexed with the active component, metal salts in the active component are Mg and K, the chelating agent is one or more of citric acid, triacetic acid, triethylamine ethylenediamine and potassium sodium tartrate. The chelating agent adjusts alkali active sites of a reaction system through acidic functional groups of the chelating agent, maintains an acid-base environment required by the reaction, and promotes an isomerization reaction from glucose to fructose. Meanwhile, the chelating agent and the metal ions form a stable complex to prevent metal salt from inactivation, and the metal ions are ensured to be uniformly distributed on the surface of the carrier and prevented from being agglomerated through the dispersity of the chelating agent, so that the activity and stability of the catalyst are improved. By controlling the dosage of the chelating agent and coordination of metal ions, the selectivity of the glucose isomerization reaction and the fructose yield are effectively improved, side reactions are inhibited, and the overall efficiency of the reaction is remarkably improved.

The invention provides an efficient and environment-friendly reverse osmosis membrane scale inhibition cleaning agent based on a composite formula, and relates to the field of reverse osmosis membrane cleaning. Comprising effective components and water, and the effective components comprise the following raw materials in percentage by mass: 10-15% of a surfactant, 10-15% of a sterilizing agent, 30-40% of a composite chelating agent, 10-20% of slow-release organic acid, 5-10% of compound enzyme, 5-10% of an oxidizing agent and 1-5% of a defoaming agent; the composite chelating agent is a compound which takes attapulgite and montmorillonite as carriers and is loaded with hydroxyethyl ethylenediamine triacetic acid trisodium salt; the slow-release organic acid is citric acid modified by carboxymethyl chitosan. The cleaning agent provided by the invention contains the composite chelating agent, the slow-release organic acid, the compound enzyme, the surfactant, the sterilizing agent and the like in effective components, is prepared into the cleaning agent with water, has the effect of efficiently cleaning the reverse osmosis membrane, and is high in cleaning efficiency and small in damage to the reverse osmosis membrane.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention discloses an amino acid-amide-saccharide composite leaching agent and application thereof, and belongs to the technical field of industrial solid waste recycling and carbon dioxide capture and utilization, the composite leaching agent is formed by compounding a main leaching agent amino acid, an auxiliary leaching agent amide compound and an auxiliary chelating agent saccharide or a derivative thereof. According to the method, through the synergistic effect of the amino acid, the amide and the saccharide chelating agent, the calcium ions in the calcium-containing solid waste can be efficiently and highly selectively leached under the mild condition without additional acid. According to the composite system, through multiple coordination and spatial screening effects, the leaching selectivity of calcium ions can reach 99.5% or above, and dissolution of impurities is effectively inhibited; the zwitterionic characteristics of amino acid and the coordination of amide are utilized to realize proton self-sufficiency in the system and simplify the process; all the components have good biocompatibility and are green and environment-friendly; the composite system can also be used as a crystal modifier to induce high-purity calcium carbonate.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.