110 results about "Electrowinning" patented technology

The invention relates to the technical field of titanium-steel composite plates, and particularly discloses a high-thermal-conductivity titanium-steel cold-rolled composite plate and a preparation method thereof.The preparation method comprises the steps that plasma etching treatment is conducted on a titanium plate, a TiB2-graphene heat conduction layer is arranged on the etched surface in a laser cladding mode, and an aluminum oxide whisker layer is deposited on a stainless steel plate through plasma electrolysis; the preparation method comprises the following steps: spraying nano-copper slurry on the surface of aluminum oxide whiskers, curing, carrying out composite rolling on a modified titanium plate and a stainless steel plate, and carrying out annealing and tempering treatment after rolling to obtain the high-thermal-conductivity titanium steel cold-rolled composite plate.

The invention discloses a method for recovering rare earth and valuable metal from waste rare earth alloy by using ionic liquid, and belongs to the technical field of non-ferrous metal metallurgy. Comprising the following steps that (1) recycled waste rare earth alloy is smashed, and waste rare earth alloy powder is obtained; (2) the waste rare earth alloy powder is put into ionic liquid to be subjected to a leaching reaction, solid-liquid separation is conducted after leaching is completed, and solid rare earth salt and filtrate are obtained; and (3) the filtrate serves as electrolyte, an electrolytic deposition system is constructed for electrodeposition, and valuable metal is obtained. The recovery method also has the advantages of simple process, environmental friendliness, high purity of the regenerated electrolyte and stable performance, and has great popularization and application prospects.

The invention provides a method for comprehensively recovering valuable metals from liquid purified by an antimony-based adsorbent, and belongs to the field of hydrometallurgy. The method comprises the following steps: (1) primary electrodeposition copper removal; (2) primary purification and impurity removal; (3) secondary electrodeposition copper removal; (4) secondary purification and impurity removal; (5) diffusion dialysis; (6) neutralizing to remove iron; (7) nickel precipitation by oxalic acid; and (8) roasting to obtain the high-purity nickel oxide powder. The treated object is the copper electrolyte subjected to purification and impurity removal through the antimony-based adsorbent, and the content of arsenic, antimony and bismuth impurities is remarkably reduced. By means of the method, it can be guaranteed that the quality of electric copper reaches the A-level copper standard, meanwhile, generation of highly toxic H3As gas is avoided, the comprehensive utilization efficiency of valuable metal resources in purified liquid is high, and the method is suitable for industrial application of copper electrolyte purification.

The invention relates to the technical field of zinc-containing solid waste treatment, in particular to a process for preparing zinc powder in a zinc-containing solid waste treatment solution through electrodeposition. The invention discloses a process for preparing zinc powder by electrodeposition in a zinc-containing solid waste treatment solution, which comprises the following steps: adding an impurity removal agent into the zinc-containing solid waste treatment solution, and carrying out solid-liquid separation after impurity removal to obtain an impurity-removed solution; performing extraction treatment on the impurity-removed liquid to obtain a loaded organic phase and raffinate, and performing washing and back extraction on the loaded organic phase to obtain back extraction liquid; and treating the strip liquor as electrolyte, and performing electrolytic deposition to obtain the zinc powder. According to the technology, the technical problems that a traditional zinc-containing solid waste treatment pyrogenic process is high in energy consumption, large in pollution and large in product impurity amount, and a wet process is long in flow, difficult to control and high in cost are solved.

Described herein are methods and systems for additive manufacturing of parts comprising electrolytic deposits and electrophoretic deposits. Such methods and methods provide various new ways for integrating different materials into composite parts. Specifically, an additive manufacturing system comprises an electrode array with individually-addressable electrodes. Each individually-addressable electrode is coupled to a separate deposition control circuit, which selectively connects this electrode to a power supply. When forming a composite part, the electrode array can control the location of each electrolytic deposit (by controlling the current flow through each individually-addressable electrode) and each electrophoretic deposit (by controlling the electric field distribution). An electrolyte solution or an electrophoretic suspension is provided between the electrode array and deposition electrode to form corresponding deposits. In addition to the electrode-array provided control, alternating the electrolytic and electrophoretic deposition operations can be used to locate the corresponding deposits within a composite part.

The application discloses a method for preferentially extracting antimony from lead-antimony co-associated ores, comprising the following steps: mixing lead-antimony co-associated ore materials with sulfides and alkali according to certain proportions to obtain mixed materials; low-temperature roasting the mixed materials to obtain roasted materials; water leaching and solid-liquid separation treatment of the roasted materials to obtain water leaching solution; configuring the water leaching solution into an electrodeposition solution; and electrolytic deposition treatment of the electrodeposition solution to obtain antimony on a cathode. The low-temperature roasting-water leaching-electrodeposition process can realize preferential extraction of antimony and efficient separation of lead and antimony. Lead is enriched in the water leaching residue, which is helpful for subsequent extraction and smelting of lead, and avoids the industry common problem that lead-antimony intermediate alloy is difficult to separate in the traditional process. In the application, sulfides of antimony fully react with sodium sulfide and sodium hydroxide in the roasting process, and the reaction rate is faster than that in water solution leaching. Not only the reaction time is shortened, but also the consumption of sodium sulfide is significantly lower than the amount required in conventional alkaline hydrometallurgy of antimony.

A system for dynamic oxidation of a heap of copper ore includes a “process island” for formulating and dispensing oxidizing reactive mixtures having predetermined compositions, and irrigating the heap with the mixtures to progressively transform the ore and maintain conditions for enhanced recovery of metal by heap leaching, solvent-extraction and electrowinning. In embodiments, the system is adapted to obtain copper metal from the refractory copper mineral chalcopyrite.

The invention discloses a short process method for extracting precious metals by integrating thiosulfate electrochemical leaching and recovery, which includes: dissolving thiosulfate and an electrolyte, adding an alkaline solution, stirring evenly to obtain an electrolytic solution; adjusting the pH of the electrolytic solution to 7-13, then placing the electrolytic solution and materials containing precious metals in the electrolytic cell, and using an electrode system set in an electrolytic cell for electrolysis reaction, so that precious metals are leached at the anode and deposited at the cathode; collecting precious metals deposited on the cathode. This invention can simultaneously achieve the integrated extraction of anode precious metal leaching and cathode precious metal ion electrolytic deposition, as well as precious metal leaching and recovery in one reaction device; It has the advantages of high extraction efficiency, short process flow, low reagent consumption, low energy consumption, and no pollution.

This invention provides a method for recovering copper from waste circuit boards, belonging to the field of waste circuit board recycling technology. The method for recovering copper from waste circuit boards according to this invention includes the following steps: (1) Crushing and sorting: mechanically crushing and sorting the waste circuit boards to obtain copper-enriched metal particles; (2) Pre-leaching: mixing the metal particles with a dilute sulfuric acid solution to perform a pre-leaching reaction, obtaining pre-leaching residue and pre-leaching solution; (3) Electrolytic deposition: using the pre-leaching solution as an electrolyte for electrolytic deposition to obtain high-purity copper deposits; (4) Post-treatment: washing and drying the copper deposits to obtain recovered copper. The entire recycling process of the technical solution described in this invention does not generate harmful gases or wastewater, resulting in minimal environmental pollution. Furthermore, this invention allows for copper leaching and electrodeposition within the same device, shortening the process flow and reducing energy consumption.

The present invention relates to a preparation device and preparation method of an electrolytic metal foil, wherein the preparation device of the electrolytic metal foil comprises: an electrolytic cell, a cathode system, an anode system and an insulating partition; wherein the cathode system comprises a rotating device and a cathode; the cathode is located in the electrolytic cell; the rotating device is connected to the cathode to drive the cathode to rotate during the electrolytic deposition process; the anode system comprises an anode; wherein the anode is placed in the electrolytic cell and arranged around the cathode; the insulating partition is placed in the electrolytic cell and is located between the cathode and the anode; the insulating partition is arranged around the cathode, and the anode is arranged around the insulating partition; a plurality of meshes are provided on the insulating partition to adjust the uniformity of the electrolytic metal foil in the width direction by adjusting the aperture and distribution of the meshes. The electrolytic metal foil preparation device of the present invention can ensure the uniformity of the metal foil, and it is small in size, flexible in operation, and can meet industrial production conditions, providing an experimental device for the development of high-performance electrolytic metal foil preparation technology.

The present invention relates to a method for depositing a zinc-nickel alloy on a substrate, particularly to a method for electrolytically depositing a zinc-nickel alloy on a substrate, wherein a zinc-nickel deposition bath is utilized as a catholyte comprising at least one brightening agent, wherein the at least one brightening agent has a source which is substantially free of, preferably does not comprise, halogen anions. The present invention furthermore relates to a respective aqueous zinc-nickel deposition bath, a respective brightening agent, and a respective use of said brightening agent for replenishing in an aqueous zinc-nickel deposition bath.

The invention relates to a process for producing copper foil by electrolytic deposition of copper metal on a rotating drum cathode and, in particular, to the means for dissolving the copper to be deposited in the process. In the process, copper is electrolytically deposited on a rotating drum cathode, which is partially immersed in an electrolyte solution contained in a plating tank; the deposited copper layer is peeled off the part of the drum cathode that is not immersed in the electrolyte solution to obtain the copper foil; an insoluble anode is used as counter-electrode to the drum cathode; the electrolyte solution contains copper ions, organic additives and an Fe2+ / Fe3+ redox system; the concentration of copper ions in the electrolyte solution is maintained constant by passing the electrolyte solution through a copper dissolution unit; in the copper dissolution unit, the electrolyte solution is in contact with an auxiliary anode and an auxiliary cathode; copper metal and an oxygen-containing gas are introduced into the copper dissolution unit; the auxiliary anode is in contact with the copper metal; the oxygen-containing gas contacts the surface of the copper metal; the copper metal continuously dissolves into the electrolyte solution by being oxidized by the Fe3+ component of the Fe2+ / Fe3+ redox system.

A three-compartment electrowinning cell comprises a cathode in contact with a catholyte comprising a metal chloride dissolved in aqueous hydrochloric acid, optionally containing an additive, such as DMSO, and an anode in contact with an aqueous anolyte. The catholyte and anolyte are in separate compartments separated from each other by a middle compartment between an anion exchange membrane (AEM) on the catholyte side, and a cation exchange membrane (CEM) on the anolyte side. The middle compartment comprises an aqueous solution of a salt. The salt solution provides a compartment to maintain charge neutrality and provides a clean solution for subsequent electrodialysis, which closes the process loop. The electrowinning products are a metal (e.g., a critical metal such as Zn or a non-critical metal such as iron), which deposits on the cathode, and oxygen gas which is generated at the anode.

The invention relates to the technical field of electrolytic manganese, in particular to a method for increasing the manganese electrolysis yield. The method comprises the following steps: filtering a manganese sulfate and ammonium sulfate composite solution, and then adjusting the pH value to obtain a purified solution; the filtering treatment comprises chelating resin filtering and / or precise filter element filtering; the purified liquid is subjected to electrolytic deposition under the first cathode pulse average current density, the second cathode pulse average current density and the third cathode pulse average current density in sequence, and electrolytic manganese metal is obtained; the average current density of the first cathode pulse and the average current density of the third cathode pulse are 50-70 A / m < 2 > lower than the average current density of the second cathode pulse; and the electrolytic manganese metal is passivated and dried. The method provided by the invention can effectively inhibit cathode manganese from flaking, and has the advantages of remarkably improving the product yield and the like.

The invention relates to the technical field of electrolytic deposition, and discloses an electrolyte concentration real-time compensation method in a copper-zinc electrodeposition process. Comprising the following steps: synchronously acquiring copper ion concentration data, zinc ion concentration data, sulfate ion concentration data and chloride ion concentration data in an upper layer fixed sampling position set, a middle layer fixed sampling position set, a lower layer fixed sampling position set and an electrode adjacent region fixed sampling position set according to a fixed time sampling window; performing time continuity verification, space consistency verification and ratio change track consistency verification on the concentration data, establishing a reference interval, and generating a deviation level and state label set; and executing a segmented compensation path according to the state label set, and carrying out sequence adjustment on copper salt solution adding rate setting data, zinc salt solution adding rate setting data, water supplementing dilution amount setting data, circulating flow setting data and stirring rotation speed setting data. According to the invention, fast steady state recovery can be realized and the overcompensation risk can be reduced.

The present invention discloses a method for preparing high-purity cobalt by deeply purifying copper and nickel ions in a cobalt solution, which relates to the technical field of cobalt metal purification and preparation. High-purity cobalt is prepared through three steps: replacing Cu ions with cobalt powder, adsorbing Ni ions with resin, and cobalt electrowinning. Cobalt powder is added to the cobalt solution containing Cu and Ni impurity ions, stirred and mixed to replace Cu elemental precipitation and obtain a filtrate, and a Cu-rich pure solution is obtained after extraction. The filtrate passes through an ion exchange resin column to adsorb Ni<supgt;2+< / supgt; on the ion exchange resin, and the resin exchange post-liquid is subjected to insoluble anode electrowinning to obtain high-purity cobalt with a purity of 5N. Through the analysis and prediction of the Ni<supgt;2+< / supgt; adsorption process, the adjustment of the ion adsorption time is realized; the present invention has low cost, simple operation, high production efficiency, and maximizes the resource utilization of recycled copper and nickel, which is of great significance to the industrial preparation technology of high-purity cobalt.

The invention discloses a method for extracting and purifying 5N-grade high-purity metal through supercritical CO2 fluid, and relates to the technical field of high-purity metal preparation. Aiming at the problem that an existing process is difficult to give consideration to environmental protection, large scale and high purity, the method sequentially performs raw material pretreatment, supercritical CO2 system construction and complexation reaction, multi-stage gradient pressure separation, complex analysis, electrolytic deposition and raw material recycling. The core lies in that a fluorinated chelating agent is adopted to enhance the selectivity of target metal ions, ultrasonic-assisted complex reaction acceleration is combined, impurities are removed through multi-stage gradient pressure separation grading, the chelating agent is recovered through low-temperature decompression analysis, finally, 5N-stage high-purity metal is obtained through electrolytic deposition, and meanwhile, circulating reuse of supercritical CO2 and the chelating agent is achieved. The method does not need strong acid, does not discharge waste water, can obviously improve the product purity, reduces the energy consumption and cost, and supports large-scale continuous production.

The present invention relates to a method for phosphating metal surfaces, preferably alloy-galvanized steel strip surfaces, by treating them by dipping or spray-dipping with acidic, aqueous solutions which may contain magnesium ions, phosphate ions and nitrate ions and, for further improvement of the layer formation, possibly further ions selected from ammonium ions, alkali metal ions and / or fluoride ions, wherein the workpieces are simultaneously treated cathodically with a direct current.

The present invention relates to an acidic aqueous composition for electrolytic copper plating, comprising: (i) copper(II) ions; and (ii) one or more suppressors consisting of or comprising a single N-heteroaromatic monocycle containing at least two ring nitrogen atoms and more than one substituent covalently bonded to one of the ring nitrogen atoms and / or to a ring carbon atom, wherein the substituents are independently one or more linear or branched polyalkylene glycol moieties, and / or one or more linear or branched polyalkylene glycol block polyalkylene glycol, or random polyalkylene glycol moieties, with the proviso that if the suppressor comprises an OH group, it is the terminal OH group of each of the polyalkylene glycol moieties, polyalkylene glycol block polyalkylene glycol, and random polyalkylene glycol moieties, and the suppressor does not comprise an NH group, a halogen atom, or a sulfur atom; a method of electrolytic copper plating using the acidic aqueous composition; and a specific suppressor as defined above.

The present invention discloses a method for preparing a titanium-based noble metal anode by cathodic plasma electrolytic deposition and the preparation method. The anode includes a titanium substrate and a noble metal oxide coating on its surface. The surface of the titanium substrate has a certain roughness and no oxide layer. The thickness of the noble metal oxide coating is 0.5 - 10 μm, and the iridium-tantalum ratio is 1:9 - 9:1. The preparation method is as follows: Step 1: Pretreat the titanium substrate; Step 2: Prepare the electrolyte; Step 3: Use the titanium substrate pretreated in Step 1 as the cathode, connect a platinum sheet to the positive electrode as the anode, immerse the anode and cathode in the electrolytic solution in Step 2, and perform electrolytic deposition to finally obtain an iridium-tantalum oxide anode. The present invention, while preparing an oxide carrier on the metal surface by a one-step method, enables the noble metal to be simultaneously loaded in the oxide coating, and uses the energy released by the micro-arc generated by the voltage to perform sintering during the electro-deposition process, avoiding repeated brushing and sintering; it has the characteristics of simple operation and high process efficiency.

The invention relates to a method for manufacturing a three-dimensional item comprising at least one metal pattern, comprising at least:a step A of providing a flat substrate of thermoformable material;a step B of forming on a surface of the flat substrate a temporary masking coating that adheres to said surface, to obtain a masked substrate having at least one unmasked area;a step C of thermoforming the flat substrate to give the latter a generally three-dimensional shape;a step D of metallizing the masked substrate to form a metal deposit on the latter, at least on said unmasked area;and a step E of eliminating said temporary masking coating,the thermoforming step C being carried out before metallization step D and before step E of eliminating said temporary masking coating, the metallization step D being carried out by non-electrolytic deposition from one or more metallization solution(s) containing at least one metal in metal cation form and at least one reducing agent adapted to transform the metal cation into metal, by spraying the metallization solution(s) in the form of one or more aerosol(s).Method for manufacturing three-dimensional items with metal pattern(s)

The present application belongs to the technical field of separating and purifying platinum, palladium and rhodium in a three-way catalyst, and particularly relates to a method for separating and purifying platinum, palladium and rhodium in a three-way catalyst by molten salt electrolysis, comprising the following steps: S1 electrolyte system construction: taking the three-way catalyst metal to be purified as an anode, adopting a titanium plate as a cathode, adopting a closed inert protection environment electrolytic cell, and adopting a eutectic molten salt as an electrolyte; S2 step-by-step electrolytic deposition: the first step is platinum deposition; the second step is palladium deposition; and the third step is rhodium separation; and S3 product treatment: the treatment of platinum and palladium products comprises respectively taking out the cathodes in the platinum and palladium deposition stages, stripping the deposits, and then vacuum smelting to obtain platinum and palladium products; the treatment of rhodium products comprises taking out the anode, collecting the anode mud on the surface of the anode, treating to obtain rhodium fine products, and then vacuum smelting the rhodium fine products to obtain rhodium products; the present application can efficiently separate platinum, palladium and rhodium, the products have high purity, and the present application is environmentally friendly.

An electrowinning cell for extracting metals from an electrolyte solution, the electrowinning cell comprising a housing, a solution inlet, a solution outlet, a plurality of anodes, a plurality of cathodes and a product outlet, wherein at least one anode is substantially impermeable and configured to maintain a gap between a lower edge of the anode and the housing, so that fluid flow of solution is directed below the anode, and wherein at least one cathode is secured at a lower edge to the housing to prevent fluid flow below the lower edge of the cathode.

The invention discloses a nickel-containing wastewater treatment method which comprises the following steps: adding a pH regulator into nickel-containing wastewater, stirring, and precipitating impurity metal ions to obtain a first mud-water mixture; performing mud-water separation on the mud-water mixture to form nickel-containing filtrate and first impurity sludge; adding a pH regulator into the nickel-containing filtrate, regulating the pH value to be greater than 10, and stirring to form nickel hydroxide precipitate, so as to obtain a second mud-water mixture; performing mud-water separation on the second mud-water mixture to form clear water and second impurity sludge; adding a 30% sulfuric acid solution into the second impurity sludge, and stirring to form a nickel sulfate electrolyte; the nickel sulfate electrolyte is subjected to electrolytic deposition to form a nickel simple substance, and a boric acid buffer agent and a sodium hydroxide solvent are supplemented to adjust the PH value to be 2.8-3.5; and the nickel elementary substance is recycled. According to the method, high-purity nickel elementary substances can be separated out, secondary processing is not needed, and the purity requirement of finished nickel is met; the dosage of the agent is small, and secondary pollution is reduced.

The invention discloses a method for recovering metallic tin from aluminum-tin alloy waste, which comprises the following steps: electrochemically dissolving the aluminum-tin alloy waste in a sulfuric acid solution with the mass concentration of 20-30%, carrying out electrolytic deposition on tin on a cathode to recover metallic tin with the purity of more than 99%, leaving aluminum in an electrolyte in the form of aluminum sulfate, and after electrolysis is finished, recovering the metallic tin from the aluminum-tin alloy waste. The method comprises the following steps: adding metal aluminum sheets or aluminum powder into an aluminum sulfate solution to replace residual metal impurities such as tin and nickel in a reaction solution, filtering to obtain a primary filtrate, adding activated carbon to adsorb and remove organic impurities such as oil stains to obtain a secondary purified solution, and carrying out evaporation concentration, cooling crystallization and other steps on the secondary purified solution to obtain aluminum sulfate octadecahydrate. The aluminum sulfate octadecahydrate can meet the requirements of water purifying agents and nickel-cobalt-aluminum-lithium battery raw materials, compared with the prior art, metal aluminum and metal tin in the aluminum-tin alloy waste can be thoroughly separated, the purity of the recycled metal tin is high, the quality of byproduct aluminum sulfate is good, high economic value is achieved, and the whole process is small in pollution and quite environmentally friendly.

The present invention relates to a method for producing copper foil on a rotating drum cathode by electrolytic deposition of copper metal, and more particularly to a means for dissolving the copper deposited during the process. In this method, copper is electrolytically deposited on a rotating drum cathode partially immersed in an electrolyte solution contained in a plating bath; the deposited copper layer is peeled off from the portion of the drum cathode not immersed in the electrolyte solution to obtain a copper foil; an insoluble anode is used as a counter electrode for the drum cathode; the electrolyte solution contains copper ions, organic additives, and Fe. 2+ / Fe 3+ The electrolyte solution contains an oxidation-reduction system; the concentration of copper ions in the electrolyte solution is maintained constant by passing the electrolyte solution through a copper dissolution unit; in the copper dissolution unit, the electrolyte solution contacts an auxiliary anode and an auxiliary cathode; copper metal and an oxygen-containing gas are introduced into the copper dissolution unit; the auxiliary anode contacts the copper metal; the oxygen-containing gas contacts the surface of the copper metal; the copper metal is converted into Fe 2+ / Fe 3+ Fe in redox systems 3+ It is oxidized by the components and subsequently dissolves in the electrolyte solution.

The invention relates to a device and method for coupling heavy metal recovery, organic matter degradation and hydrogen production, and belongs to the technical field of wastewater treatment and recycling. The device comprises a pretreatment system, a metal electrolytic deposition and coupling hydrogen production system and an automatic regulation and control system, the metal electrolytic deposition and coupling hydrogen production system is a divided-chamber electrolytic tank, and the synergistic reaction of heavy metal ion electrochemical reduction, organic matter electrocatalytic oxidation and hydrolysis hydrogen production can be achieved; a net-shaped stainless steel electrode is arranged in the cathode chamber, metal ions are driven to be directionally reduced into high-purity metal simple substances at a specific temperature and specific impressed current, and meanwhile hydrogen is separated out; a DSA mesh electrode is arranged in the anode chamber, and the organic matter is subjected to electrocatalytic oxidation at a specific temperature and specific impressed current and is coupled with a cathode to produce hydrogen. Heavy metal recovery, clean energy preparation and wastewater treatment are organically combined, and the method has the advantages of being high in resource recovery efficiency, low in energy consumption, environmentally friendly and the like.

A method for recovering zinc and indium in low-quality secondary zinc oxide comprises the steps that S1, part of secondary zinc oxide is subjected to alkali washing, and alkali washing residues and alkali washing liquid are obtained; and carrying out ammonia leaching on the residual secondary zinc oxide to obtain ammonia leaching liquid and ammonia leaching residues. S2, performing low-acid leaching on the alkali washing residues to obtain supernate and neutral leaching underflow; and washing the ammonia leaching residues to obtain washing liquid and washing residues. And S3, the neutral leaching underflow and the washing residues are mixed and subjected to acid leaching to obtain acid leaching liquid and acid leaching residues, and the acid leaching liquid is subjected to extraction and reverse extraction and then is subjected to zinc powder replacement to obtain sponge indium. S4, the ammonia leaching liquid is subjected to heavy removal and ammonia leaching side zinc electrodeposition, and waste electrolyte I and metal zinc I are obtained; and removing impurities from the supernate, and then carrying out alkali washing and side zinc electrodeposition to obtain waste electrolyte II and metal zinc II. According to the method disclosed by the invention, the secondary zinc oxide is divided into two parts, and the two parts are respectively subjected to alkali washing treatment and chlorine ammonia leaching, so that the advantages of the two treatment methods are effectively combined, the coordination capability of zinc, ammonia and chlorine is fully utilized, the effective separation of zinc and indium is realized, and the efficient recovery of zinc and indium is realized.

Disclosed in the present invention is a method for thiosulfate-based electrochemical leaching-recycling integrated short-process extraction of a precious metal. The method comprises: dissolving a thiosulfate and an electrolyte, then adding an alkali liquor thereto, and stirring same until uniform to obtain an electrolyte solution, wherein the electrolyte is a salt which does not contain a thiosulfate; adjusting the pH value of the electrolyte solution to 7-13, then placing the electrolyte solution and a material containing a precious metal into an electrolytic bath, and performing an electrolysis operation using an electrode system arranged in the electrolytic bath so as to achieve the leaching of the precious metal at an anode and the deposition thereof at a cathode, the voltage of the electrolysis operation being 0.1-3 V; and collecting the elemental precious metal deposited on the cathode. The present invention can achieve both the leaching of a precious metal at an anode and the electrolytic deposition of precious metal ions at a cathode in one reaction device, realizes integrated extraction of a precious metal by means of synchronous leaching and recycling, and has the advantages of high extraction efficiency, a short technological process, low reagent consumption, low energy consumption, no pollution, etc.

According to the method for reducing the lead content of the zinc hydrometallurgy electrolytic zinc, when an electrolytic bath is used for electrolytic deposition of zinc, the method comprises the following steps that (1) a lead-silver anode plate is arranged in an anode plate protection groove, and the lead-silver anode plate and a cathode aluminum plate are arranged in the electrolytic bath together; the connecting line direction of the filter cloth in each anode plate protection groove is perpendicular to the flowing direction of the electrolyte; (2) adding the purified zinc sulfate solution into the electrodeposition waste liquid, adding from one end of an electrolytic bath, and flowing out from the other end of the electrolytic bath; (3) introducing direct current; (4) after a single electrodeposition period is finished, taking out the cathode plate, stripping the zinc sheet, brushing the cathode aluminum plate to be smooth, and reloading the cathode aluminum plate into the electrolytic cell after the cathode aluminum plate is clean; and the anode and the anode plate protection groove are taken out every 10-30 days, and anode mud is cleaned. According to the method, insoluble lead-containing anode mud is physically isolated from entering a cathode region, and meanwhile, the arrangement of a filter cloth connecting line is controlled to be perpendicular to the flowing direction of electrolyte, so that the problem that the lead content of a zinc sheet is relatively high due to the fact that the anode mud enters the cathode region can be effectively solved.