55 results about "Zinc hydroxide" patented technology

The invention discloses a production method of a high-transparency and high-toughness BOPA (Biaxially Oriented Polyamide) film. The BOPA film is prepared from PA6T / 6I, a polyether-b-amide thermoplastic elastomer, POE (Polyolefin Elastomer), bis (tert-butylperoxyisopropyl) benzene, itaconic acid, zinc hydroxide, styrene and an antioxidant. The compatibility of the ITA-grafted POE is obviously improved, the tensile strength and the elongation at break of the blend are obviously improved, the toughening effect is effectively improved, the modified POE neutralized by the zinc hydroxide part not only can improve the compatibility between PA6T / 6I and POE, but also can reduce the influence of stable chemical bonds on the fluidity reduction of the blend, so that the toughness of the blend is improved. The later-stage processability of the blend is facilitated, and the product quality is improved; the polyether-b-amide thermoplastic elastomer, as a multi-block elastomer composed of a hard segment and a soft segment, can further improve the toughness of the blending material.

This invention belongs to the field of secondary utilization technology of metal resources, specifically relating to a method for treating waste liquid from electroplating zinc-nickel alloys. The method includes the following steps: S1, mixing the waste liquid from electroplating zinc-nickel alloys, oxygen, and a catalyst, and performing an oxidation reaction to obtain an intermediate liquid and nitrogen; the oxidation reaction temperature is ≥220℃; S2, adjusting the pH of the intermediate liquid to 13.0-13.5, performing a first filtration separation to obtain nickel hydroxide sludge and filtrate 1; S3, adjusting the pH of filtrate 1, performing a second filtration separation to obtain zinc hydroxide sludge and filtrate 2. This invention first degrades COD to obtain zinc and nickel ions; adjusting a specific pH value generates nickel hydroxide sludge, with zinc ions existing in the system as polyhydroxy zinc anions, achieving separation of nickel and zinc; further adjusting the pH separates zinc from the system as zinc hydroxide sludge precipitate. The operation is simple, with high separation efficiency and high purity.

This invention provides a one-dimensional silver nanostructure / metal hydroxide composite material, its preparation method, and its application. The preparation method includes: adding a one-dimensional silver nanostructure, a metal salt, and an additive to a solvent and stirring to disperse them evenly; adding an acidic or alkaline reagent under stirring conditions to adjust the pH of the solution, causing the metal ions in the solution to convert into metal hydroxide precipitates, obtaining a one-dimensional silver nanostructure-metal hydroxide suspension; then performing solid-liquid separation, washing and drying the obtained solid product to obtain a one-dimensional silver nanostructure / metal hydroxide composite powder; wherein the metal hydroxide is aluminum hydroxide, zinc hydroxide, magnesium hydroxide, iron hydroxide, manganese hydroxide, copper hydroxide, nickel hydroxide, or cobalt hydroxide, and the one-dimensional silver nanostructure is silver nanowire or silver nanoribbon. The resulting composite material uses metal hydroxide as a carrier and separator, inhibiting the drying and agglomeration of silver nanowires from the source, exhibiting high conductivity and good redispersibility, thus improving conductivity.

This utility model discloses a comprehensive treatment system for zinc-containing waste generated in viscose fiber production, belonging to the field of waste treatment in viscose fiber production. The system includes a reaction tank, filter press, pretreatment device, filter, ion exchange resin column, and acid bath preparation tank, ensuring a comprehensive treatment pathway for zinc-containing waste. This facilitates the mixing of highly acidic, high-salt zinc-containing wastewater with zinc-containing sludge. The strong acidity of the wastewater allows for the acid leaching of zinc sulfide and zinc hydroxide in the sludge, simultaneously obtaining a zinc sulfate solution and recovering sulfate to prepare sodium sulfate and sulfuric acid. This reduces the salinity of the wastewater, thereby decreasing the amount of reagents used in treating zinc-containing wastewater, mitigating scaling risks, and reducing the load on subsequent biochemical systems.

A heat stabilizer additive for reducing thermal degradation and / or surface resistivity of plasticized PVC compounds comprising: 1.0-25.0 wt % of a carbodiimide; and 75.0-99.0 wt % of a heat stabilizer comprising: (1) zinc-containing component selected from neutral or overbased zinc salts of C1-C24 linear, branched, cyclic aliphatic or aromatic organic acids, zinc diketonates, zinc alcoholates, zinc oxide, zinc hydroxide, zinc phosphite, zinc perchlorate, zinc carbonate and mixtures thereof, or metal-free nitrogen-containing compounds selected from thiourea, triethanolamine, 6-amino-1,3-dimethyl-uracil, 6-amino-1,3-di-n-propyl-uracil, 6-amino-1,3-di-n-butyl-uracil, 6-amino-1,3-diethyl-thiouracil, 6-amino-1,3-di-n-butyl-thiouracil or mixtures thereof, and optionally (2) co-stabilizers selected from hydrotalcites, zeolites, nitrogen-containing compounds, organic phosphite esters, diketones, and mixed metal compounds; and polymer compounds comprising: 30.0-89.0 wt % of a PVC homopolymer or PVC copolymer; 10.0-69.0 wt % of a primary plasticizer comprising an epoxidized natural oil or it's blends with epoxidized fatty acid monoesters; 0.01-5.0 wt % of the carbodiimide; and 0.3-5.0 wt % of the heat stabilizer.

Alkaline electrochemical cells are provided, wherein methods to decrease or eliminate shorting in batteries by preventing zinc oxide reaction precipitate from creating a conductive bridge between the two electrodes. The alkaline electrochemical cell comprises solid zinc oxide particles in the anode and dissolved zinc oxide or zinc hydroxide in one or more of the catholyte, the anolyte, and the free electrolyte. Optimally, the solid zinc oxide particles have a large Brunauer, Emmett, and Teller (BET) surface area and / or a large median particle size (D50). The cells may also comprise a certain amount of surfactant in the separator.

The present application relates to the technical field of hydrometallurgy, and discloses a method for preparing hydroxide from reverse copper-manganese solution, which comprises the following steps: controlling the potential of the reverse copper-manganese solution to carry out sulfidation copper deposition, so as to obtain a copper deposition solution; adjusting the pH of the copper deposition solution to 4-6, mixing the copper deposition solution with manganese powder to carry out manganese-zinc replacement, and obtaining zinc-manganese slag and a zinc deposition solution after sufficient reaction; mixing the zinc-manganese slag with sufficient zinc-dissolving alkali solution to carry out reaction, and obtaining manganese slag and the zinc-dissolving solution after solid-liquid separation; adjusting the pH of the zinc-dissolving solution to 7-8, and carrying out solid-liquid separation after sufficient reaction, so as to obtain zinc hydroxide. The method has a short overall process, good separation and purification effect, and can obtain crude manganese hydroxide and zinc hydroxide products.

The application discloses an iron modified ZIF8 nanoparticle encapsulating an antitumor drug and a preparation method and application thereof, and belongs to the technical field of medicines. The preparation method of the nanoparticle comprises the following steps: firstly, preparing a zinc hydroxide loaded antitumor drug, then adding 2-methyl imidazole to obtain a ZIF8 nanoparticle encapsulating the antitumor drug, and finally adding Fe 2+ A methanol solution of a salt is reacted to obtain the iron modified ZIF8 nanoparticle encapsulating the antitumor drug. Through process improvement, the application loads an antitumor chemotherapy drug in the ZIF8 material, so that the ZIF8 material has good acid responsive drug release capacity. Through iron element modification, the nanoparticle is endowed with peroxidase activity, so that the nanoparticle can realize acid and hypoxia responsive chemotherapy and chemical kinetics therapy. The nanoparticle and microorganisms capable of producing lactate oxidase are combined to show super strong non-external field responsive precise tumor treatment capacity.

The invention provides a method and system for removing zinc and extracting zinc from chlor-alkali coupled galvanized waste, and the method for removing zinc and extracting zinc from chlor-alkali coupled galvanized waste comprises the following steps: driving chlor-alkali equipment with green electricity, electrolyzing a sodium chloride solution to prepare hydrogen, chlorine and a sodium hydroxide solution, and synthesizing hydrochloric acid from the hydrogen and chlorine from the chlor-alkali equipment under a heating condition; pickling and soaking the zinc plating waste by using the synthesized hydrochloric acid to obtain a chloride solution and hydrogen; performing multiple-effect evaporation on the chloride solution to obtain a concentrated solution and diluted hydrochloric acid, and reusing the diluted hydrochloric acid for pickling and soaking; performing fractional precipitation on the concentrated solution by using a sodium hydroxide solution from chlor-alkali equipment, and separating zinc hydroxide precipitate and waste liquid; performing heat treatment on the separated zinc hydroxide precipitate to obtain zinc oxide; hydrogen generated by pickling and soaking is used for reducing zinc oxide hydrogen, and zinc metal with the purity larger than 99% is obtained; sodium chloride and sodium hydroxide in the waste liquid obtained through fractional precipitation are recycled, sodium chloride is recycled to chlor-alkali equipment, and sodium hydroxide is recycled to fractional precipitation.

The invention relates to the technical field of roadbed engineering, and provides multi-element solid waste foam light soil and application thereof.The multi-element solid waste foam light soil is prepared from, by weight, 60-80 parts of red mud, 25-35 parts of blast furnace slag, 10-20 parts of steel slag, 20-30 parts of cement, 1.5-3 parts of sodium silicate, 5-8 parts of zinc hydroxide, 5-8 parts of modified glass fiber, 60-80 parts of water, 8-10 parts of foaming agent and 0.6-0.8 part of water reducing agent; the modified glass fibers are obtained by coating glass fibers with magnesium hydroxide. According to the technical scheme, the problem that the strength of the multi-element solid waste foam light soil is poor in the prior art is solved.

This invention discloses a composite nano-zinc oxide material for the degradation of organic pollutants in water and its preparation method, belonging to the field of wastewater treatment agent preparation technology. A dispersion is obtained by mixing p-phenylenediamine, terephthalic acid, deionized water, and a mesoporous conditioner. An aqueous solution of zinc chloride is added to the dispersion, and the mixture reacts to obtain a porous polymer material. The porous polymer material is then impregnated in an alkaline solution to obtain zinc hydroxide@porous material. A mixed solution is obtained by mixing and dissolving ammonium molybdate, thiourea, and deionized water. The zinc hydroxide@porous material and the mixed solution are then subjected to a co-heating reaction and calcination to obtain the composite nano-zinc oxide material. This invention prepares a zinc hydroxide@porous material with a porous structure, and then reacts it with a molybdenum disulfide precursor solution to obtain a composite nano-zinc oxide material with good degradation effect on organic pollutants.

The invention discloses a preparation method of a polyfluorinated arylamine compound, and belongs to the technical field of chemical synthesis. The method comprises the following steps: by taking polyfluoroaryl zinc carboxylate as a raw material or a reaction system consisting of polyfluoroaryl carboxylic acid and zinc hydroxide as a raw material, mixing the raw material with an O-benzoyl hydroxylamine compound, and reacting in a solvent at 40-100 DEG C for 8-14 hours under the synergistic effect of a copper-based catalyst and a bipyridine / phenanthroline ligand, the polyfluorinated arylamine compound is efficiently prepared through decarboxylation and C-N coupling reaction. The process does not need strong base and harsh anhydrous and anaerobic conditions, can be compatible with substrates containing various substituent groups such as bromine, phenyl, methoxyl and the like, has the target product yield of 54-82%, has the advantages of wide substrate universality, mild reaction conditions, simplicity and convenience in operation, controllable cost and the like, and provides an efficient and feasible solution for large-scale production in the fields of medicines and materials.

The invention discloses a deep red light perovskite light-emitting diode device based on interface modification and a preparation method, and relates to the technical field of light-emitting display, a perovskite light-emitting diode adopts an inversion structure, and comprises a glass substrate, a bottom electrode, an electron injection layer, an electron transport layer, a perovskite light-emitting layer, an interface modification layer, a hole transport layer and a top electrode from bottom to top in sequence; and the electron transmission layer is a zinc oxide film formed by spin-coating zinc hydroxide on the electron injection layer and then annealing and converting. The electron injection layer is spin-coated and annealed, and Zn (OH) 2 is converted into a thin film, so that a harmful interface deprotonation reaction between the electron transport layer and the perovskite layer is blocked, and the operation stability of the perovskite light-emitting diode is remarkably improved; and the interface modification layer is introduced, so that the potential barrier between the hole transport layer and the perovskite light-emitting layer is reduced, and a perovskite thin film with low defect density and good morphology can be formed.

Alkaline electrochemical cells are provided, wherein methods to decrease or eliminate shorting in batteries by preventing zinc oxide reaction precipitate from creating a conductive bridge between the two electrodes. The alkaline electrochemical cell comprises solid zinc oxide particles in the anode and dissolved zinc oxide or zinc hydroxide in one or more of the catholyte, the anolyte, and the free electrolyte. Optimally, the solid zinc oxide particles have a large Brunauer, Emmett, and Teller (BET) surface area and / or a large median particle size (D50). The cells may also comprise a certain amount of surfactant in the separator.

The invention provides a preparation method of an emulsified cutting fluid and a product thereof. According to the method, n-alkane chloride is added, and bis (2-ethylhexyl) hydrogen phosphate is added, so that the friction coefficient of the cutting fluid is reduced; zinc chloride is added, zinc hydroxide nanoparticles are generated in situ, the friction coefficient of the cutting fluid is reduced, and the dispersion stability of the zinc hydroxide nanoparticles in the cutting fluid can be improved; water-soluble polyether is adopted to inhibit silicon-water reaction, so that the surface roughness of the silicon-containing material is reduced, and the smoothness is improved; 1-dodecene hydrogenated oligomer is added, so that the shearing resistance of the cutting fluid is improved, the biodegradation rate is increased, and the environmental friendliness is improved; the cutting temperature in the cutting process is reduced by adopting the endothermic reaction liquid, and the service life of the cutting tool is prolonged.

The present invention discloses a method for preparing zinc-doped metatitanic acid and a method for producing titanium dioxide using a sulfuric acid process. The method comprises the following steps: S1, mixing or dissolving a zinc-containing compound with a sodium hydroxide solution having a concentration of not less than 1 mol / L, removing impurities and diluting the solution to obtain a diluted zinc-containing alkali solution having a sodium hydroxide concentration of 0.1 to 0.5 mol / L; S2, adding industrial titanium solution to the diluted zinc-containing alkali solution so that the pH value of the system is 4.7 to 5.3 and the system temperature is 30 to 40°C after the addition is completed, thereby obtaining a zinc hydroxide suspension; S3, heating the zinc hydroxide suspension to 70 to 90°C, then transferring the solution to preheated industrial titanium solution and stirring and mixing the solution to obtain a mixed solution; S4, heating the mixed solution to boiling and hydrolyzing the solution to obtain zinc-doped metatitanic acid. The present invention is advantageous for effectively regulating the calcination temperature and rutile grains, and does not require salt treatment of the zinc-doped metatitanic acid. The conversion to rutile titanium dioxide can be completed by direct calcination at a relatively low temperature.

The invention relates to a method for selectively separating zinc and magnesium from a zinc hydrometallurgy solution crystallization product, and belongs to the field of metallurgical solid waste recycling, the zinc hydrometallurgy solution crystallization product is dissolved in water at room temperature to obtain a mixed solution, magnesium sulfide powder is slowly and uniformly added into the mixed solution in a stirring state, a reaction is carried out at room temperature, and magnesium sulfide powder is obtained; zinc is converted into zinc sulfide and zinc hydroxide to be precipitated and separated out, liquid-solid separation is conducted, zinc sulfide and zinc hydroxide solids mixed with a small amount of magnesium and a magnesium sulfate solution containing a small amount of zinc are obtained, the zinc sulfide and zinc hydroxide solids are returned to a zinc smelting system to be utilized, and the magnesium sulfate solution is directly recycled to obtain magnesium sulfate; selective separation and resource utilization of zinc hydrometallurgy solution crystallization products zinc sulfate and magnesium sulfate are achieved, the process is simple, no waste water or waste residue is discharged, and the process is clean and environmentally friendly.

The invention discloses an amino acid-zinc complex catalyst as well as preparation and application thereof in PET (Polyethylene Terephthalate) degradation. The amino acid-zinc complex catalyst is formed by complexing nitrogen-terminal protected amino acid and zinc oxide or zinc hydroxide. Carbonyl groups in PET molecules can be effectively activated through a complex structure formed by amino acid and zinc, breakage of C-O bonds is promoted, and efficient degradation is achieved under relatively mild conditions.

Alkaline electrochemical cells are provided, wherein methods to decrease or eliminate shorting in batteries by preventing zinc oxide reaction precipitate from creating a conductive bridge between the two electrodes. The alkaline electrochemical cell comprises solid zinc oxide particles in the anode and dissolved zinc oxide or zinc hydroxide in one or more of the catholyte, the anolyte, and the free electrolyte. Optimally, the solid zinc oxide particles have a large Brunauer, Emmett, and Teller (BET) surface area and / or a large median particle size (D50). The cells may also comprise a certain amount of surfactant in the separator.

The invention relates to a method for preparing high-purity nano zinc oxide by electrochemically dissolving zinc, and belongs to the technical field of powder material preparation. Comprising the following steps: (1) electrochemically dissolving zinc, and preparing a zinc-containing solution under the action of direct current; (2) solution adjustment: adding a neutralizer into the zinc-containing solution to adjust the pH value to 4.0-6.0, and diluting the zinc ion concentration to 0.1-0.3 mol / L; (3) hydro-thermal synthesis: transferring the adjusted solution into a high-pressure reaction kettle, adding a slow-release weak base and a surfactant, and reacting at 120-150 DEG C for 4-8 hours to obtain a zinc hydroxide precipitate; and (4) calcining treatment: calcining the zinc hydroxide to obtain the high-purity nano zinc oxide. The method is green, environment-friendly, simple and convenient in process, low in energy consumption and suitable for large-scale preparation.

The invention discloses a hydrotalcite-like catalyst and a preparation method and application thereof, the hydrotalcite-like catalyst comprises Ni hydroxide, Zn hydroxide and Al hydroxide, the Ni hydroxide is metered by Ni, the Zn hydroxide is metered by Zn, the Al hydroxide is metered by Al, and the molar ratio of the Ni hydroxide to the Zn hydroxide to the Al hydroxide is (0.5-2): (0.5-2): 1. The preparation method of the hydrotalcite-like catalyst comprises the following steps: preparing a nickel salt, a zinc salt and an aluminum salt into a solution, then mixing the solution with a precipitant solution, controlling the pH value to be 7-11, collecting a precipitate, and drying to obtain the hydrotalcite-like catalyst. The NiZnAl hydrotalcite-like catalyst is prepared through a coprecipitation method, and the catalyst has a good catalytic effect on synthesis of N-alkylindole and derivatives of N-alkylindole. Moreover, the NiZnAl hydrotalcite-like catalyst disclosed by the invention does not contain noble metal, is a heterogeneous catalyst, can be repeatedly recycled and is suitable for industrial application.

The present disclosure relates a filter system for an air decontamination device for the removal of volatile organosulfur compounds (VOSCs) from indoor air at room temperature, comprising a filter cartridge, the filter cartridge containing granules and / or pellets made of two zinc compounds, the two zinc compounds being zinc hydroxide, Zn(OH)2, and zinc peroxide, ZnO2, and wherein the filter acts as an absorption filter, reacting irreversibly with the volatile organosulfur compounds that may contaminate the indoor air, either vapors of liquid organic thiols (RSH), of liquid dialkyl oligosulfides (RS-SR and RS–S-SR, including those present in Allium species), and of the solvent carbon disulfide (CS2). The disclosure also relates to a method for removing these groups of volatile organosulfur compounds from indoor air, wherein a controlled airflow of the indoor air is passed through a filter system comprising granules or pellets prepared from zinc hydroxide, Zn(OH)2, and zinc peroxide, ZnO2, and wherein the volatile organosulfur compounds irreversibly react with the hydroxide and peroxide ions of the aggregates (either pellets or granules) to yield solid and innocuous zinc salts, and are thereby captured in the filter system.

To provide an alkaline electrochemical battery.SOLUTION: Alkaline electrochemical cells are provided, wherein dissolved zinc oxide or zinc hydroxide is included at least in the free electrolyte solution, and / or solid zinc oxide or zinc hydroxide is included in the anode, so as to slow formation of a zinc oxide passivation layer on a zinc electrode. Methods for preparing such cells are also provided.SELECTED DRAWING: Figure 1

A personal care composition may include a water-soluble zinc hydroxychloride having a chemical formula Zn(OH)2-xClx, where x is from 0.67 to 1.89. The personal care composition may further include glycine. The personal care composition may be an antiperspirant or a deodorant. The water-soluble zinc hydroxychloride may be made by a method including reacting zinc chloride with a base to form a reaction product comprising the water-soluble zinc hydroxychloride. The water-soluble zinc hydroxychloride may also be made by a method including reacting zinc oxide or a water-insoluble zinc hydroxide with an acid to form a reaction product comprising the water-soluble zinc hydroxychloride.

This invention provides an alkaline electrochemical battery, wherein at least the free electrolyte solution contains dissolved zinc oxide or zinc hydroxide, and / or the anode contains solid zinc oxide or zinc hydroxide to slow down the formation of a zinc oxide passivation layer on the zinc electrode. Furthermore, this invention also provides a method for preparing the alkaline electrochemical battery.

The application discloses a method for stabilizing a ZnOHF protective layer in zinc sulfate and application of the method to a water-based zinc ion battery, only introduces an external ion, that is, the existence of ZnOHF is stabilized in 2M ZnSO4 through electrolyte regulation, so that the ZnOHF can synergize, a uniform electric field is achieved, and the purpose of uniform zinc deposition is achieved, meanwhile, the protective layer in the solution is continuously repaired, so that the method for stabilizing a zinc negative electrode is realized. The electrolyte solvent is water, and the solute is zinc fluoride (ZnF2) and zinc sulfate (ZnSO4). The protective layer is zinc hydroxide fluoride (ZnOHF). The zinc negative electrode comprises zinc sheets, zinc foils, zinc powders, zinc meshes, porous zinc or zinc alloys. Under the synergistic effect of the electrolyte and the protective layer, the zinc negative electrode exhibits excellent deposition-dissolution reversibility, the dendrite growth is inhibited, the hydrogen evolution reaction is inhibited, and the generation of by-products is slowed down. The method is simple and low in cost, and can significantly improve the cycle stability of the zinc negative electrode in the water-based zinc ion battery.

The application discloses a preparation method of a nano zinc oxide / graphene composite photocatalyst based on vapor deposition, and particularly relates to the following steps: S1, preparation of a precursor solution; S2, placing the precursor solution obtained in the step S1 into a thermostat for heat treatment; S3, soaking and washing the wet gel obtained in the step S2 with distilled water; S4, placing the wet gel after soaking and washing into a freeze dryer for rapid freezing and vacuum drying; S5, preparation of a zinc hydroxide aqueous solution; S6, vacuum filtration of the zinc hydroxide aqueous solution; S7, heat treatment of the zinc hydroxide powder obtained in the step S6 to obtain zinc oxide powder; S8, crushing the graphene aerogel obtained in the step S4; and S9, preparation of the nano zinc oxide / graphene composite photocatalyst. The photocatalyst prepared by the method has greatly improved degradation efficiency of organic dyes compared with nano zinc oxide. The application also discloses the nano zinc oxide / graphene composite photocatalyst based on vapor deposition.

The application provides a preparation process of a high-oxidation-resistance circuit board, and belongs to the technical field of printed circuit boards; the process comprises the following steps: pretreating a copper foil; performing surface oxidation-resistance treatment; preparing a composite board; and preparing a high-oxidation-resistance circuit board.The formaldehyde resin is generated through the addition condensation reaction of the chlormequin diterpene polyphenol in the Taraxacum mongolicum Hand.-Mazz and formaldehyde under the catalysis of ammonia water, meanwhile, the zinc sulfate heptahydrate is converted into zinc oxide nanoparticles through "zinc-ammonia complex-zinc hydroxide-zinc oxide", and the zinc oxide nanoparticles are driven to form zinc oxide composite microspheres through surface tension and the force between zinc oxide and formaldehyde resin, and the zinc oxide composite microspheres are added into the protective layer resin, so that the oxidation resistance of the protective layer resin and the oxidation resistance of the circuit board are effectively improved, in addition, the uniform dispersion of the zinc oxide nanoparticles is facilitated, and the local oxidation of the protective layer in the use process is prevented.

The present invention provides a novel and efficient method for recovering manganese and producing manganese dioxide from hot cake wastes of zinc production industries. In this process, the waste is first subjected to three stages of leaching with sulfuric acid to extract zinc from it. Then, the leaching solution is separated by filtration and by adding lime water, zinc hydroxide precipitate is obtained. These precipitates are used for the next stage, i.e., modified leaching. In the next step, using ferrous sulfate and sulfuric acid, the conditions for manganese extraction are optimized and the purification process is carried out by removing impurities such as iron, nickel and cadmium. Finally, manganese dioxide is produced with high purity using ammonium persulfate as an oxidant. This method is applicable as an economical and sustainable solution for the metal recycling industry by increasing extraction efficiency, reducing costs and reducing environmental impacts.

Provided is a zinc-based desulfurizing agent having excellent desulfurizing performance at around room temperature. This method for producing the zinc-based desulfurizing agent comprises: a neutralization step for neutralizing a zinc ion-containing aqueous solution to precipitate a zinc component; a solid-liquid separation step for subjecting the precipitated zinc component to solid-liquid separation to obtain a zinc hydroxide-containing dehydrated cake; and a drying step for drying the zinc hydroxide-containing dehydrated cake at a temperature equal to or lower than the decomposition temperature of zinc hydroxide to obtain a zinc hydroxide-containing solid.