35results about "Zinc halides" patented technology

The invention discloses a solid waste-based zinc chloride preparation process control method and system, and relates to the technical field of zinc chloride preparation, and the method comprises the following steps: obtaining a unified time base line, establishing a bubble phase reference field, collecting a sound-induced echo sequence, a micro-pressure waveform sequence and a light scattering sequence of a reaction liquid under the bubble phase reference field, and calculating the solid waste-based zinc chloride preparation process. Fusing to generate a bubble density space-time matrix; and performing reversible time-frequency rearrangement based on the bubble density space-time matrix, decomposing to obtain different frequency band distributions, extracting a narrow-band resident bubble group, calculating critical volume distribution and collapse precursor indexes, and constructing a dynamic risk fingerprint database. According to the method, a unified time base line and a bubble phase reference field are constructed, the bubble state is perceived in real time, collapse forebodes are recognized, a dynamic risk fingerprint database is established, directional intervention and reverse energy channel collapse nucleus extinguishing are achieved in combination with an energy aggregation node, finally closed-loop regulation is constructed through calibration write-back, the safety and stability of zinc chloride preparation are improved, and the method is suitable for large-scale popularization and application. And efficient utilization and clean production of solid waste are promoted.

The invention discloses a ZnF2 (at) FeF3. 0.33 H2O positive electrode material as well as a preparation method and application of the ZnF2 (at) FeF3. 0.33 H2O positive electrode material. The preparation method comprises the following steps: step 1, uniformly mixing ethanol and PEG-400 to obtain a mixed solvent; 2, ferric nitrate and zinc nitrate are dissolved in a mixed solvent, then an HF aqueous solution is dropwise added into the obtained solution under stirring, after stirring, the obtained mixed solution is transferred into a stainless steel high-pressure kettle to be heated in a closed mode and cooled to the room temperature, a product is washed, centrifuged and dried in vacuum, and powder is obtained; 3, the powder is placed in a tubular furnace and subjected to heat preservation treatment in the argon atmosphere, then the powder is naturally cooled to the room temperature, a product is taken out and ground, and the ZnF2-coated FeF3. 333 H2O material is obtained. By doping ZnF2, FeF3. 0.33 H2O has higher electronic conductivity and a more stable structure, and an all-solid-state lithium battery prepared from the FeF3. 0.33 H2O has higher specific capacity and better cycling stability.

The invention provides an upgrading and purifying method for waste tire pyrolysis carbon black, and belongs to the technical field of upgrading, purifying and high-value utilization of waste tires and waste rubber pyrolysis carbon black. The upgrading and purifying method comprises the following steps: carrying out wet magnetic separation on waste tire pyrolysis carbon black to obtain pyrolysis carbon black subjected to magnetic separation; mixing the cracked carbon black subjected to magnetic separation with hydrobromic acid for acid leaching to obtain first acid leaching filtrate and a first carbon black product; adding zinc particles into the first acid leaching filtrate to obtain second filtrate; evaporating and crystallizing the zinc bromide solution to obtain zinc bromide; zinc bromide is prepared into heavy liquid, the first carbon black product is subjected to reselection, and a pure carbon black product and silicon dioxide tailings are obtained; introducing hydrogen sulfide gas into the ferric ion solution for purification and absorption to obtain sulfur and a third filtrate; and the third filtrate is subjected to electrolytic regeneration, and a regenerated ferric ion solution and hydrogen are obtained after electrolytic regeneration is finished. According to the method, the acid leaching byproduct zinc bromide is used as a reselection medium, and resource recycling is achieved while efficient separation and impurity removal are achieved.

The invention discloses an electronic waste efficient chlorination comprehensive recovery device and method, and relates to the technical field of chemical metallurgy, the electronic waste efficient chlorination comprehensive recovery device comprises a chlorination reaction cavity, a heating system, a vacuum system, an atmosphere control system and a condensation separation system; the heating system is used for controlling the temperature of the chlorination reaction cavity; the vacuum system is communicated with the heating system; the atmosphere control system comprises a chlorine gas source and a protective gas source; and the temperature of the condensation separation system is gradually reduced. Through the high-purity graphite heating assembly, the sealing structure and the atmosphere control system, the highest heating temperature is 1700 DEG C, the temperature limit of 1200 DEG C of a traditional quartz tube furnace can be broken through, the chlorine corrosion problem is solved, chlorine is not leaked, and the environment is not polluted. High-valued recovery of different metal resources can be achieved through low-temperature pyrolysis, high-temperature chlorination volatilization and three-stage condensation settling separation, and the method has the advantages of being low in energy consumption, high in recovery rate, environmentally friendly and the like and is suitable for industrial metal resource recovery.

The present disclosure relates to a device comprising: a) a three-dimensional perovskite compound layer; and b) a capping material layer including a capping material and disposed on the three-dimensional perovskite compound layer. The invention also relates to a method for preparing the device and a use of the device. Preferably, the capping material is a compound having the formula (A2) 2M (X2) 4, (A2) 2 (A1) M2 (X2) 7, (A2) mMn (X2) 3n + m, or any mixture thereof, and is preferably substantially free of Pb < 2 + > or Sn < 2 + >.

The invention provides a preparation device for regenerating zinc chloride for vulcanized fiber and a production process thereof, which relates to the technical field of zinc chloride regeneration, and comprises: a base; two groups of stable seats are fixed on the base, an acid dissolving tank is installed at the upper end of the two groups of stable seats, a top cover is installed at the upper end of the acid dissolving tank, a top cover is installed with a top seat through bolts, a stirring shaft is installed inside the acid dissolving tank, and a bracket is arranged above the top seat; in the invention, a crushing roller and a pulverizing roller are rotated by running a No. 3 motor, a filter cake is preliminarily crushed by the crushing roller, and further pulverized by the pulverizing roller, and the surface area of ​​the zinc chloride filter cake is greatly improved through this double pulverizing process, thereby effectively improving its subsequent reaction rate and ensuring the sufficiency of the reaction, and a push rod pushes the hydrochloric acid solution in the push pipe into the acid dissolving tank by contracting a No. 1 hydraulic rod, so that the hydrochloric acid solution is accurately added and the efficient regeneration and utilization of zinc chloride is realized.

The application discloses a recycling method of titanium oxychloride solution by-produced in chlorination method of titanium dioxide, and comprises the following steps: S1, mixing and reacting the titanium oxychloride solution after removing iron with ZnO to generate ZnCl2; S2, beating the metatitanic acid filter cake after two washing and adding alkali to neutralize and remove sulfur; S3, beating the metatitanic acid filter cake after removing sulfur, adding the reaction solution prepared in the step S1 and other salt treatment agents to carry out salt treatment, and then carrying out solid-liquid separation to obtain a filter cake; and S4, calcining the filter cake. The application combines the titanium oxychloride solution with the preparation of the titanium dioxide by sulfuric acid method for the first time, utilizes the reaction of hydrochloric acid and ZnO to prepare the reaction solution containing ZnCl2, replaces the ZnCl2 salt treatment agent in the prior art, is used for the salt treatment of the titanium dioxide by sulfuric acid method, and simultaneously, the pH after the salt treatment makes the titanium oxychloride contained in the reaction solution hydrolyze into titanium dioxide, so that the purpose of recycling titanium in the titanium oxychloride can be achieved.

The application discloses undoped and ion-doped all-inorganic non-lead double-center metal halide materials and preparation and application thereof. The all-inorganic non-lead double-center metal halide materials are synthesized by a solution method in one step, stirring and mixing, and temperature reduction and crystallization, and finally colorless flaky transparent crystals are obtained, and the structural composition of the crystals is A5BB'X8:M, wherein A is an alkali metal ion, B is a divalent metal cation, B' is a monovalent metal cation, X is a halogen ion, A and B' cannot be the same, and M is a doping ion. The preparation method is simple, the metal halide crystal material obtained is environment-friendly, non-toxic, stable, and has high-efficiency visible light wide-spectrum luminescence performance, and has great development potential in the fields of illumination, display, photoelectric detection, solar cells, lasers, sensors, photoelectric catalysis and the like. The application solves the toxicity problem of lead-based perovskite, improves the stability of the new all-inorganic non-lead double-center metal halide through doping, and simultaneously improves the fluorescence performance, and has good application prospect in various fields.

The application discloses a resource utilization method of high-fluorine and high-chlorine soot, and belongs to the technical field of metallurgical solid waste treatment. The resource utilization method of high-fluorine and high-chlorine soot comprises the following steps: performing alkali leaching treatment on the high-fluorine and high-chlorine soot to obtain an alkali leaching solution and an alkali leaching residue; performing one-stage acid leaching on the alkali leaching residue to obtain a one-stage leaching solution and a one-stage leaching residue; performing two-stage acid leaching on the one-stage leaching residue to obtain a two-stage leaching solution and a two-stage leaching residue; recycling the two-stage leaching solution to the one-stage acid leaching system, and outputting at least part of the two-stage leaching residue as lead residue; sequentially performing indium displacement and cadmium displacement on the one-stage leaching solution to obtain indium residue, cadmium residue and cadmium displacement solution; respectively recovering thallium from the alkali leaching solution, recovering indium from the indium residue, recovering cadmium from the cadmium residue, and recovering zinc from the cadmium displacement solution. The method realizes efficient separation and resource utilization of thallium, indium, cadmium, zinc and lead in the high-fluorine and high-chlorine soot.

The present invention relates to the technical field of supercapacitors, and particularly to MOF-derived highly porous carbon aerogels and their application to supercapacitors. The MOF-derived highly porous carbon aerogels are obtained by pyrolytic decomposition of the MOF-ZX-5 material, and the MOF-ZX-5 material is [Zn(tppa)2Cl2]. The present invention uses a novel MOF-ZX-5 as a precursor to design and synthesize a novel carbon aerogel material (MOF-derived highly porous carbon aerogel) as an electrode material for supercapacitors. The MOF-ZX-5-derived highly porous carbon aerogels have high porosity, a large specific surface area, and excellent capacitance performance. Their use as supercapacitor electrode materials features high specific capacitance, power density, and energy density, as well as fast charge and discharge rates and excellent cycle stability.

The invention relates to the technical field of chemical engineering, in particular to a method for preparing antibacterial functional core-shell silicon dioxide from fluorine-containing silicon slag, which comprises the following steps: S1, silicon slag pretreatment: mixing silicon slag with water to prepare slurry, sanding the slurry, and controlling the particle size D50 of SiO2 in the sanded silicon slag to be less than 200nm; s2, alkali activation and silicon release: mixing the sanded slurry with an alkali solution, carrying out a hydrothermal reaction, and controlling the silicon dissolution rate to be within a preset range; s3, constructing a gradient pH core shell: firstly, adjusting the pH of the system to an alkaline interval, and carrying out reaction to form a compact inner shell; adjusting the pH value of the system to an acidic interval, and adding a solution containing zinc and fluorine for reaction to form a composite shell; s4, post-treatment: washing and calcining a product obtained in the step S3 to obtain the core-shell silicon dioxide with the antibacterial function. The silicon slag is purified by a one-step method through a four-step integrated process of pretreatment, activation, gradient coating and post-treatment, and the fluorine-containing waste slag is directionally converted into a high-added-value functional material.

The invention belongs to the technical field of lithium metal batteries, and particularly relates to a preparation method and application of laser-induced ZnO / ZnF2 heterogeneous carbon cloth. The preparation method comprises the following steps: adding zinc trifluoroacetate powder into N, N-dimethylformamide, uniformly stirring to obtain a precursor solution containing ZnO / ZnF2, soaking carbon cloth (CC) in the precursor solution, standing at room temperature to obtain a ZnO / ZnF2-coated CC precursor, drying overnight, carrying out laser treatment, and forming ZnO / ZnF2-containing composite nanoparticles by laser induction to obtain the laser-induced ZnO / ZnF2 heterogeneous carbon cloth. The ZnO / ZnF2 heterogeneous interface and a built-in electric field formed by the ZnO / ZnF2 heterogeneous interface can induce ordered and uniform deposition of metal lithium and inhibit growth of lithium dendrites. Meanwhile, the prepared ZnO / ZnF2 composite nanoparticles can be used as a host material of a negative electrode of a lithium metal battery, the nucleation overpotential is reduced, the cycling stability is improved, the cycle life of the lithium metal battery is prolonged, and the stability of the lithium metal battery is improved.

The utility model provides impurity removal equipment for zinc chloride production, which comprises a separation tank, an oxidation tank is arranged above the separation tank, an upper coil pipe and a lower coil pipe which are distributed up and down are fixed in the oxidation tank, and a feeding end of the upper coil pipe penetrates through the top of the oxidation tank. The discharge end of the lower coil pipe penetrates through the bottom of the oxidation tank and is communicated with a discharge pipe penetrating through the top of the separation tank; a connecting shell is fixed in the oxidation tank through a fixing block, the discharging end of the upper coil pipe and the feeding end of the lower coil pipe are communicated with the top and the bottom of the connecting shell respectively, and two baffle plates located between the discharging end of the upper coil pipe and the feeding end of the lower coil pipe respectively are fixed in the connecting shell. According to the utility model, a zinc chloride raw material solution can be effectively preheated and then effectively and comprehensively mixed with air, so that sulfite radicals are thoroughly desulfurized after being subjected to a sufficient oxidation reaction, and the quality of subsequent zinc chloride production is ensured.

Provided are new and improved novel processes and continuous ion exchange / continuous ion chromatography (CIX / CIC) systems for the separation of iron and zinc from electric arc furnace baghouse dust.

The present disclosure provides various characteristics of a method for the production of an ultra-pure zinc bromide and zinc chloride fluid blend in a reactor system, having reduced metal impurities for the use in battery electrolyte blends, by reacting chlorine with a mixture of zinc bromide and zinc. The method disclosed can be used in continuous flow or batch processing and uses a zinc bromide to aqueous solution as catalyst in a reaction with chlorine. Chlorine, whether in liquid or gas form, added into a reactor at a controlled rate reacts with bromide to generate bromine in a much faster rate that when the zinc bromide to aqueous solution would not be present. Any un-reacted zinc is then filtered out which will ultimately result in the ultra-pure zinc bromide and zinc chloride fluid blend.

The present invention relates to the technical field of supercapacitors, and particularly to MOF-derived highly porous carbon aerogels and their application to supercapacitors. The MOF-derived highly porous carbon aerogels are obtained by pyrolytic decomposition of the MOF-ZX-5 material, and the MOF-ZX-5 material is [Zn(tppa)2Cl2]. The present invention uses a novel MOF-ZX-5 as a precursor to design and synthesize a novel carbon aerogel material (MOF-derived highly porous carbon aerogel) as an electrode material for supercapacitors. The MOF-ZX-5-derived highly porous carbon aerogels have high porosity, a large specific surface area, and excellent capacitance performance. Their use as supercapacitor electrode materials features high specific capacitance, power density, and energy density, as well as fast charge and discharge rates and excellent cycle stability.

The application provides a positive electrode material, a preparation method thereof, a positive electrode sheet, a secondary battery and an electric device. The positive electrode material comprises an inner core, a first coating layer covering at least part of the outer surface of the inner core, and a second coating layer covering at least part of the outer surface of the inner core with the first coating layer. The material of the first coating layer comprises lithium and an X element. The material of the second coating layer comprises the X element and a Z element. By forming the first coating layer, residual lithium on the surface of the inner core can be eliminated. The first coating layer has a high oxygen vacancy formation energy, which can reduce or even avoid oxygen dissolution in the inner core, reduce or even avoid the side reaction between oxygen and electrolyte due to oxygen dissolution, and improve the cycle life and safety of the secondary battery. By forming a uniform protective film on the surface of the inner core with the first coating layer, the overflow of oxygen from the position without the first coating layer can be reduced or even avoided.

The invention relates to a system for solid-state electricity storage and solid-state electricity generation that allows electricity to be stored when the renewable energy sources produce excess electricity and electricity to be generated when the electricity demand on the market exceeds the electricity production from renewable energy sources. The system comprises a solid-state electricity storage device (1) having a first electrolysis device (6) for producing chlorine from a melt of zinc chloride and solid zinc, a second electrolysis device (8) for producing hydrogen from water, a first reactor (10) for producing hydrogen chloride, and a vessel (13) with a water sprayer (14) for producing hydrochloric acid. The system further comprises a solid-state electricity generation device having a second reactor for reacting zinc and hydrochloric acid to produce hydrogen and a fuel cell for generating electricity.

This invention discloses a high-conductivity melt material for sodium salt energy storage batteries, its preparation method, and its application, belonging to the field of battery material technology. The invention involves mixing zinc chloride and sodium chloride under vacuum to obtain a mixture; adding the resulting mixture to a melting vessel, heating, and stirring after complete melting to ensure no molten material splashing; ultimately, a high-conductivity melt material is obtained. This invention proposes binary and ternary molten salt systems based on NaCl-ZnCl2 as a new generation of melt materials. The NaCl-ZnCl2 system exhibits higher electronic conductivity, ionic conductivity, ionic activity, and hydrolysis resistance. Using sodium chloride and zinc chloride as raw materials, and lithium chloride and lithium fluoride as additives, this invention employs a melt-overflow process to prepare a high-purity, hydrolysis-free NaCl-ZnCl2 melt, which can be used for the mass production of sodium salt battery melts.

The invention belongs to the technical field of CFRP composite material recovery, and particularly relates to a method for treating waste liquid generated during carbon fiber recovery from CFRP based on low temperature and dialysis. According to the method, zinc chloride in the waste liquid can be separated out, and a solid epoxy resin degradation product can be separated out, so that the problems of environmental pollution and resource waste caused by recycling the carbon fibers from the waste CFRP are effectively solved. The method does not need large instruments and equipment, and is low in cost and simple and effective to operate.

The utility model discloses a rubber sealing strip production waste recycling device, and relates to the technical field of rubber sealing strip production, an inlet of a dissolving tank is respectively communicated with a waste tank and a cyclohexane tank through pipelines, and an outlet of the dissolving tank is communicated with a centrifugal machine through a pipeline. A liquid phase outlet of the centrifugal machine is communicated with a first distillation retort through a pipeline, and a bottom outlet of the first distillation retort is communicated with a first sizing material recovery tank. By means of the dissolving tank, the waste materials are dissolved in cyclohexane, and soluble rubber components enter the solution. According to the rubber recycling system, cyclohexane is recycled, solid-liquid separation is conducted through the centrifugal machine, the liquid phase enters the first distillation tank, cyclohexane and rubber are separated, and finally recycled rubber is collected in the first rubber recycling tank, so that preliminary recycling of rubber resources is achieved, waste of rubber waste is reduced, and the production cost is reduced.

The invention discloses a method for recycling zinc chloride from galvanized scrap steel, and the steps include: sorting treatment, pretreatment, first rinsing treatment, corrosion inhibition and dezincification treatment, second rinsing treatment, material cutting treatment, composite impurity removal treatment and evaporation treatment. The invention adopts a multi-step method of wet dezincification and oxidation, zinc powder reduction, and distillation concentration to achieve short-process zinc-iron separation and direct recovery of all zinc resources, and has a short-process treatment process with obvious iron suppression, zinc dissolution, and no non-zinc impurities introduced. The synergistic effect of multi-step and step parameter control realizes the complete and effective separation of zinc and iron and the acquisition of high-concentration zinc chloride dezincification liquid, and realizes the direct recovery of zinc resources while realizing the short-process wet separation of zinc and iron, ensuring the quality reliability and stability of galvanized scrap steel added as furnace charge in steel smelting enterprises, and is conducive to the purity of raw materials for recycling galvanized scrap steel as furnace charge.

The present disclosure provides various characteristics of a method for the production of an ultra-pure zinc bromide and zinc chloride fluid blend in a reactor system, having reduced metal impurities for the use in battery electrolyte blends, by reacting chlorine with a mixture of zinc bromide and zinc. The method disclosed can be used in continuous flow or batch processing and uses a zinc bromide to aqueous solution as catalyst in a reaction with chlorine. Chlorine, whether in liquid or gas form, added into a reactor at a controlled rate reacts with bromide to generate bromine in a much faster rate that when the zinc bromide to aqueous solution would not be present. Any un-reacted zinc is then filtered out which will ultimately result in the ultra-pure zinc bromide and zinc chloride fluid blend.

The present invention relates to the technical field of industrial wastewater treatment, and discloses a method for treating waste hydrochloric acid containing iron and zinc, comprising the following steps: step 1, reducing the organic content of waste hydrochloric acid containing zinc and iron by absorption on activated carbon to obtain a low COD feed liquid; step 2, mixing the low COD feed liquid with an extractant for multi-stage extraction and separation to obtain an organic phase and a waste hydrochloric acid solution containing iron; the organic phase is stripped with water to obtain a zinc chloride solution; step 3, catalytically oxidizing and adjusting the basicity of the waste hydrochloric acid solution containing iron in sequence to obtain a water treatment agent; step 4, the zinc chloride solution is used to produce a zinc chloride product. This scheme can quickly prepare a qualified ferric chloride or polyferric chloride water treatment agent product by sequentially subjecting the waste hydrochloric acid containing zinc and iron to activated carbon pretreatment, extraction and separation, catalytic oxidation, and basicity adjustment, effectively simplifying the treatment process, improving production efficiency, and quickly realizing the resource utilization of waste hydrochloric acid containing zinc and iron.

The invention belongs to the technical field of low carbon, and particularly relates to a double-acid functionalized ionic liquid and a preparation method thereof and a method for desorbing CO2 in an organic amine solution, the double-acid functionalized ionic liquid comprises two acidic sites, the anion part is metal chloride with Lewis acid sites; when in use, the double-acid functionalized ionic liquid is added into an organic amine solution, and then CO2 in the organic amine solution is desorbed. Compared with the prior art, the problems that in the prior art, when CO2 in organic amine is desorbed through solid acid or a molecular sieve, the acid site is prone to inactivation, metal pollution is prone to occurring, and operation is complex are solved. The ionic liquid provided by the scheme has two acidic sites, so that the CO2 release amount and the desorption rate during desorption can be effectively improved, the regeneration energy consumption of a saturated CO2 amine solution is reduced, and the cost of a carbon capture process is reduced.

The invention discloses a Sb < 3 + > activated zinc-based zero-dimensional organic-inorganic hybrid metal halide and a preparation method thereof. The chemical formula of the Sb < 3 + > activated zero-dimensional organic-inorganic hybrid metal halide is A2ZnBr4: xSb < 3 + >, wherein A < + > is a cation of benzyl triethyl ammonium bromide (C13H22NBr) or a cation of isopropyl triphenyl phosphorus bromide (C21H22BrP); 0 lt; xlt; and 40 mol%. The excitation wavelength of the organic-inorganic hybrid metal halide ranges from 250 nm to 500 nm, the emission wavelength ranges from 550 nm to 800 nm, emission peaks are located at 720 nm and 730 nm respectively, and the organic-inorganic hybrid metal halide can be matched with blue light LED chips, can be used for manufacturing near-infrared light-emitting devices and can be applied to the fields of biological imaging, agricultural product nondestructive quality analysis and the like.

Methods for the formulation of biodegradable microparticles for delivery of protein drugs, such as botulinum toxin, have been developed. The methods include the steps of precipitating and washing proteins with organic solvent to remove water prior to dispersing in polymer-dissolved organic solvent to prevent exposure to water / solvent interfaces and maintain bioactivity of the protein drugs and fabrication of microparticles by either template or emulsion method. Biodegradable microparticles, formed of one or more biodegradable polymers having entrapped in the polymer one or more protein agents, such as botulinum toxin, are also provided. Precipitated botulinum toxin and botulinum toxin-loaded microparticles can also be formulated into thermogels or crosslinked hydrogels. The stability of the protein within these microparticles, as well as the controlled release of the entrapped agents, provides for sustained efficacy of the agents.

The present invention discloses a system and method for comprehensively treating zinc dross. Among them, the system for comprehensively treating zinc dross includes: a screening device, a ball mill, a powder-ash separation unit, a pickling device, a first solid-liquid separation device, and an evaporation and crystallization device. Using this system to comprehensively treat zinc dross enables thorough separation of each material component in the zinc dross, significantly improving the zinc recovery rate (the zinc recovery rate is as high as over 99%), and the process flow is simple, the operation is convenient, the energy consumption is low, and it is environmentally friendly; in addition, the impurity element chlorine in the zinc dross is well discharged, avoiding adverse effects on the hydrometallurgical zinc system, and the zinc chloride obtained by comprehensive treatment can also be sold as a product, having good economic benefits and environmental emission reduction benefits.

The invention discloses a recovery treatment process for hot-dip galvanized steel. The recovery treatment process comprises the steps of pretreatment, dezincification treatment, rinsing treatment, continuous impurity removal treatment and evaporation treatment. The recovery treatment process for the hot-dip galvanized steel provided by the invention belongs to a short-process special process for inhibiting iron, dissolving zinc and not introducing non-zinc ions; the complete separation of a zinc coating on the surface of the hot-dip galvanized steel and the preparation of zinc chloride crystals with the zinc chloride content of not less than 95% and the iron content of 0.05-0.2% are realized through the synergistic effect of all treatment steps and parameter control; and no zinc residue is left on the surface of the hot-dip galvanized steel after dezincification, the quality reliability and stability of a steel matrix as foundry returns are guaranteed, and various defects and problems caused by the fact that traditional hot-dip galvanized steel enters furnace charges at present are solved.