40 results about "Electrowinning" patented technology

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.

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.

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 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 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 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 discloses a porous copper foil taking an aluminum foil as a cathode carrier and a preparation method and application thereof, and the preparation method comprises the following steps: preparing an electrolyte: taking deionized water as a solvent of the electrolyte, and containing copper sulfate, sulfuric acid, chloride ions, SPS (Sulfonyl Phosphate Sulfonate), PEG (Polyethylene Glycol) and collagen; electrode assembly: putting a titanium plate as an anode and an aluminum foil as a cathode into the electrolytic cell, wherein the titanium plate and the aluminum foil are relatively arranged in parallel; and electrolytic deposition is conducted, specifically, direct current is introduced into the electrolytic cell for electrochemical deposition, the electrolysis temperature is controlled to be 30-60 DEG C, the current density is 10-50 A / dm, a stirring device is adopted to stir electrolyte in the electrochemical deposition process, the stirring speed is 50-300 r / min, and the porous copper foil is directly deposited on the surface of the aluminum foil cathode. The preparation method has the beneficial effects that accurate control of the thickness, the pore diameter and the porosity of the porous copper foil is realized through coordinated regulation and control of electrolyte components and process parameters.

A real-time monitoring system and method for inhibiting arsine evolution in electrodeposition de-arsenic process of copper electrowinning is provided. The system includes a PLC control module, a primary mother liquor real-time monitoring module, an de-arsenication circulating solution real-time monitoring module, a de-arsenicated solution real-time monitoring module, and an accurate regulation module. The present invention utilizes copper-arsenic electrowinning and concentration competition differences, with the difference and limit of copper arsenic concentration in the de-arsenication circulating liquid as the constraint indexs, and the PLC control module is configured to control monitoring modules to acquire copper and arsenic concentrations in a primary mother liquor, an de-arsenication circulating solution and a de-arsenicated solution in real time, to calculate and analyze required copper and arsenic ion concentrations in the de-arsenication circulating solution, and to accurately regulate dosage volume of the primary mother liquor with high copper and arsenic concentrations.

The invention belongs to the technical field of resource recycling and green metallurgy, and particularly relates to a method for recycling zinc from a waste automobile outer covering part steel plate containing a paint layer. The method comprises the steps that a steel plate is subjected to oxygen-enriched atmosphere heat treatment and water quenching, a paint layer is removed, and zinc-iron compound microcracks are induced; zinc and iron fragments are collected through high-pressure water jet; the fragments and the steel plate are put into an acid leaching solution containing sulfuric acid, mineral oil and a composite extraction auxiliary agent to react, and selective dissolution and extraction of zinc are achieved; and the separated oil phase is subjected to back extraction to obtain zinc-rich liquid, the zinc-rich liquid is combined with the acid-soaked water phase, and high-purity metal zinc is obtained through diphenylthizone precipitation, zinc ion imprinted polymer adsorption purification and electrolytic deposition. The method realizes efficient recovery of zinc and protection of the steel matrix, solves the problems of low recovery rate, poor purity and matrix corrosion in the traditional method, and has remarkable economic and environmental benefits.

The invention relates to the technical field of hydrometallurgy and resource recovery, in particular to a method for comprehensively recovering zinc and indium from a low-indium high-iron zinc-containing solution, which comprises the following steps: pretreating iron oxide ions, complexing, precipitating and separating iron, extracting and enriching indium, precipitating and recovering zinc, recovering indium by back extraction and electrolytic deposition, and the like. Through multistage separation and selective regulation and control technical means, zinc and indium are efficiently and synchronously recovered, and iron ion interference is effectively removed. According to the method, efficient separation and resource utilization of iron, zinc and indium in the low-indium high-iron zinc-containing solution can be achieved, and the method is stable in process, environmentally friendly, economical and suitable for comprehensive recovery of complex multi-metal solutions.

The invention discloses a method for preparing an ultrathin high-ductility copper foil through electrolysis and rolling compounding, and relates to the technical field of metal material processing. Electrolytic deposition and a multi-stage rolling process are combined, a nanocrystalline structure substrate layer is formed on the surface of the electrolytic copper foil, then grain orientation is optimized through a low-temperature annealing and gradient rolling process, and finally the high-performance copper foil with the thickness smaller than or equal to 6 micrometers, the elongation larger than or equal to 15% and the tensile strength larger than or equal to 350 MPa is obtained. The method solves the technical contradictions of insufficient ductility of the traditional electrolytic copper foil and high surface roughness of the rolled copper foil. The invention has the characteristics of simple process, low cost and excellent performance, and is suitable for the precise electronic fields such as electronic components, lithium batteries, flexible printed circuit boards (FPCB) and the like.

A solution electrolysis device for hydrometallurgy comprises a solution electrolysis system and an electrolyte circulating filtration system, the solution electrolysis system comprises a tank body, an electrolyte outlet and an electrolyte inlet are formed in the two opposite sides of the tank body respectively, the inlet and the outlet of the electrolyte circulating filtration system are communicated with the electrolyte outlet and the electrolyte inlet respectively, and the top of the tank body is open. A plurality of partition plates are arranged at the bottom of the tank body and between the electrolyte inlet and the electrolyte outlet, the partition plates divide the interior of the tank body into a plurality of electrolysis areas, the upper sides of the electrolysis areas are communicated with one another, and the anode plates and the cathode plates are sequentially and alternately mounted in the tank body from the electrolyte inlet to the electrolyte outlet; according to the device, the concentration polarization phenomenon generated when valuable metal is extracted from a complex acid solution through electrolytic deposition is restrained, the problem of solid-phase deposition in the electrolytic bath is solved, and the device is simple in structure, convenient to operate and high in practicability. And the current efficiency and the metal yield are improved.

The invention discloses a treatment process of magnesium ions in a copper-cobalt ore hydrometallurgy system, which comprises the following steps: copper-cobalt ore pulp obtained by adding acid to leach copper-cobalt ore is sequentially sent to a dense separation process and a CCD (Charge Coupled Device) washing process, a high-copper solution and a low-copper solution produced by overflowing are respectively sent to a high-copper extraction process and a low-copper extraction process, and CCD washing underflow ore pulp is discharged to a tailing pond; the other part of the tailing backwater is subjected to atomization spraying and pond field evaporation in sequence, and crystallized magnesium sulfate is recovered and produced; copper extraction is conducted on strip liquor obtained in the high-copper extraction procedure and the low-copper extraction procedure through electrodeposition, high-copper raffinate obtained in the high-copper extraction procedure is returned to participate in acid adding leaching, lime milk is added into low-copper raffinate obtained in the low-copper extraction procedure for neutralization and impurity removal, and iron-manganese residues and impurity-removed liquor are obtained; magnesium oxide is added into the impurity-removed liquid for cobalt precipitation, and a cobalt hydroxide product and cobalt-precipitated liquid are obtained; and the cobalt-deposited liquid is directly returned to a CCD washing process to serve as washing water. The method is remarkable in economic benefit, outstanding in environmental benefit and high in process collaboration.

The invention relates to the technical field of gallium extraction, in particular to a method for extracting gallium from gallium-containing substances, which comprises the following steps: S1, adding a glycine-sodium citrate composite coordination agent into the gallium-containing materials to selectively leach out gallium, and adjusting the pH value to 8.8-9.2; s2, performing electrochemical deposition on a three-dimensional porous titanium-based PbO2 anode and a stainless steel cathode, and reducing the heavy metal into a metal elementary substance in situ by utilizing the characteristic that the reduction potential of Pb < 2 + > and Cd < 2 + > is higher than that of Ga < 3 + >, so that the concentration of the metal elementary substance is reduced to 1t; 0.1 mg / L; s3, gallium ions are specifically recognized through a Ga-IIP adsorption column, and a high-purity desorption solution is obtained through dilute sulphuric acid desorption; and S4, metal gallium is obtained through electrolytic deposition, and liquid obtained after electrolysis flows back to S1 to be recycled. Through the synergistic effect of selective complexing of the coordination agent, electrochemical in-situ heavy metal removal, ion imprinting specific adsorption and electrolyte closed-loop circulation, alkali consumption is reduced, the gallium recovery rate is high, the product purity is high, no heavy metal dangerous waste residues are generated, and the method is suitable for various gallium-containing materials such as bauxite mother liquor, lead-zinc smelting slag and coal ash.

Connection arrangement (1) connecting a first shaft (2) to a second shaft (3), wherein the end face (4) of the first shaft (2) and the end face (5) of the second shaft (3) are opposite or abutting each other, wherein both shafts (2, 3) are radially enclosed in their axial end region (6, 7) by a sleeve-shaped connecting element (8), wherein the sleeve-shaped connecting element (8) is arranged on the two shafts (2, 3) by a shrink fit, wherein the sleeve-shaped connecting element (8) is at least partially provided on its radially inwardly directed, cylindrical surface (9) with a friction-enhancing coating (10), wherein the friction-enhancing coating (10) comprises hard particles (11) which are formed by an electrolytically deposited metal layer (12) on the inwardly directed,cylindrical surface (9) of the connecting element (8) are fixed and wherein the hard particles (11) are diamond particles, boron nitride particles, silicon carbide particles or corundum particles.

This invention relates to a method for extracting iron from red mud using microwave biomass reduction-sulfuric acid leaching-electrolytic deposition, belonging to the field of resource comprehensive utilization and hydrometallurgical technology. The method first involves uniformly mixing red mud with a biomass reducing agent, then using a microwave field for rapid and efficient reduction, converting the sparingly soluble iron oxides in the red mud into readily soluble elemental iron or low-valence iron oxides. The reduction product is then leached with sulfuric acid, allowing the iron to enter the solution and separate from most impurities. Finally, the iron-rich leachate is electrolytically deposited to directly obtain high-purity electrolytic iron. This invention utilizes the selectivity and holistic nature of microwave heating, coupled with the green and renewable characteristics of the biomass reducing agent, to achieve efficient, energy-saving, and environmentally friendly recovery of iron from red mud. The process is short, energy-efficient, and has significant industrial application prospects.

This invention relates to the field of wastewater treatment technology, specifically a method and system for microwave-assisted treatment of electroplating wastewater and recovery of valuable metals. The method includes pretreatment based on specific characteristics, advanced treatment, and resource recovery. Pretreatment is used for acidic cleaning, cyanide-containing, chromium-containing, and copper-nickel-containing wastewater, employing microwave-Fenton, microwave, microwave-assisted, and microwave gas-liquid membrane processes respectively. Advanced treatment utilizes a multi-layer coupled reaction tower to achieve microwave radiation, catalytic ammonia nitrogen decomposition, and ZIF-8@cellulose adsorption. Resource recovery employs segmented acid washing desorption-electrowinning to recover copper and nickel, chromium alum crystallization, and calcination to produce ZnO. The system includes corresponding pretreatment, advanced treatment, and resource recovery units. This invention achieves high pollutant removal rates, copper and nickel recovery rates exceeding 98%, energy consumption per ton of water of 4.8 kW·h, and metal recovery revenue covering over 130% of treatment costs.

The application provides a method for recovering positive electrode metals of lithium ion batteries by microwave-assisted low eutectic solvent, which comprises the following steps: mixing betaine hydrochloride, citric acid and ethylene glycol to prepare a ternary low eutectic solvent; mixing positive electrode material powder prepared by treating waste lithium ion batteries with the ternary low eutectic solvent, and carrying out leaching treatment in a microwave reactor; after vacuum filtration, leaching liquid and leaching residue are prepared; the leaching liquid is separated and purified to prepare Li, Co, Ni and Mn metal ion products; the leaching residue is recovered to prepare reusable solid residue; and the regenerated ternary low eutectic solvent is recycled to prepare regenerated low eutectic solvent. The application can realize efficient recovery of positive electrode metals of lithium ion batteries without relying on the traditional electrolytic deposition recovery method, and can effectively reduce energy consumption and solvent decomposition degree in the process, solves the limitations of single recovery target and solvent-free circulation, and is more suitable for large-scale industrial production.

The invention relates to the electrolytic recovery of non-ferrous metals by vortex electrowinning performed in "tubes" organized into a single process cycle. The technical result of the invention is that of providing for more comprehensive recovery of metals from solutions having a low target metal content, thereby permitting an economical use of resources and an increase in product yield. This is achieved in that the claimed process is carried out in a tube or cylindrical electrolytic cell having a slot diffuser, where an electrolyte is circulated between a cathode and an anode by means of a pump, creating a swirling flow, the concentration of target metal in the solution is changed from 60 g / L to a residual concentration of 0.5 g / L, and the temperature of the solution in circulation is restricted to values of no more than 45°С.

A green and sustainable method for preparing metallic nickel by electrowinning using a nitric acid system belongs to the field of electrochemical metallurgy. This method addresses the shortcomings of existing acid leaching processes where nickel nitrate solutions cannot be directly used for electrolysis and must undergo sulfate / chloride conversion. Furthermore, the nickel nitrate-aqueous solution system suffers from severe equipment corrosion and NO generation at the cathode. x Bottlenecks such as pollution have hindered the actual production of nickel nitrate systems. This method uses nickel ore as raw material, and obtains low-hydrate nickel nitrate through acid leaching, solid-liquid separation, extraction, evaporation crystallization, and drying. After being mixed with liquid ammonia and a small amount of additives to form an electrolyte, bright electrowinning nickel is obtained through electrodeposition. Simultaneously, the ammonia can be recycled, and there is no acid mist or NO emission. x This invention reduces chlorine emissions, and its tail gas treatment method is simple and low-cost. It achieves a short process for the nitric acid system: "nickel ore → acid leaching → liquid ammonia electrowinning → high-purity nickel". This invention also eliminates acid mist and NO emissions. x Alternatively, chlorine gas can be used, which offers advantages such as high safety, low cost, and the ability to achieve green, zero-pollution recycling of liquid ammonia.

Disclosed herein is a halide electrowinning cell comprising a cathode (e.g. a titanium cathode) and an anode configured for immersion in an electrolyte comprising a metal halide. In use, passing an electrical current through the cell causes metallic dendrites to be electrowon at the cathode. The cell also comprises one or more wipers configured such that a relative movement of the cathode with respect to the one or more wipers causes the electrowon dendrites to be scraped off the cathode whilst immersed in the electrolyte, as well as a driver configured to continually move the cathode relative to the one or more wipers.

This invention provides an electrolytic additive composition and its application method. The electrolytic additive composition comprises the following components: a dithiopropanesulfonate accelerator; a polyethylene glycol inhibitor; a sodium saccharin derivative; a hydroxamic acid complexation regulator; and quaternized polyethyleneimine. The method for preparing high-strength electrolytic copper foil using the electrolytic additive composition is characterized by the following steps: adding the electrolytic additive composition to a copper sulfate-based electrolyte and mixing it evenly to obtain an electrolytic working solution; using the electrolytic working solution, performing electrolytic deposition on a cathode roller to obtain a deposited copper layer; and sequentially cleaning, drying, and tension conditioning the deposited copper layer to obtain a high-strength electrolytic copper foil product that, while maintaining high tensile strength, achieves uniform grain structure, optimized residual stress distribution, and inhibits abnormal grain growth, significantly improving the elongation performance and rolling stability of the copper foil and reducing the risk of strip breakage.

The invention provides a preparation method of an electrolytic copper foil and a copper foil, and the preparation method of the electrolytic copper foil comprises the following steps: 1) carrying out electrolytic deposition in an electrolyte containing a composite additive and copper ions by adopting pulse current to obtain a copper foil precursor; the composite additive comprises polyethylene glycol, a thiourea derivative and sodium chloride; and 2) sequentially carrying out passivating treatment and annealing treatment on the copper foil precursor to obtain the target copper foil. According to the preparation method of the electrolytic copper foil, the electrolyte comprises the composite additive, the pulse current is adopted for electrolytic deposition, the roughness of the copper foil can be reduced, the tensile strength and the ductility of the copper foil can be improved, and therefore the high-frequency signal transmission loss is small, the mechanical strength is high, and the production efficiency is high.

The invention relates to the technical field of copper electrolytic refining, in particular to an electrolyte acid copper balance control method suitable for copper electrolytic production, which comprises the following steps of: conveying electrolyte in an electrolytic production system to a first-section copper removal front liquid tank through a pipeline pump for first-section electrodeposition copper removal to produce first-section electrodeposition rear liquid and electrodeposition copper; sixteen copper removal electrolytic cells for second-stage copper removal in a clean liquid impurity removal system are connected in series and merged into first-stage electrodeposition copper removal, and first-stage electrodeposition / second-stage copper removal production is flexibly carried out according to the copper ion concentration of the electrolyte; one part of the first-section electrodeposited liquid enters an independent circulating system of an electrolysis production system to participate in circulation; according to the method, continuous and stable production of the electrolysis system under the conditions of 368 A / m < 2 > high current density and a high-grade anode plate with the Cu content of 99.4% is achieved, copper which is originally opened in the form of crude copper sulfate is output in the form of high-quality electro-deposited copper, the quality of the electro-deposited copper reaches the A-grade copper standard, and the comprehensive copper recovery rate of the electrolysis system is increased on the premise that system acid-copper balance is achieved.

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 kind of brown waste liquid comprehensive utilization method of circuit board, belong to brown waste liquid processing method technical field, including the pretreatment of brown waste liquid at room temperature, depth purification brown waste liquid, electrolytic deposition recovery cathode copper, four steps of collaborative acidification treatment ink waste liquid recovery ink slag;The method does not need heating, does not use strong oxidant potassium permanganate, sodium chlorate under the condition of electrolytic recovery high-quality cathode copper plate, avoids the risk of environmental pollution in the secondary treatment process of traditional brown waste liquid, electrolytic deposition recovery copper causes fire and leakage chlorine, while collaborative treatment ink waste liquid, saves a lot of sulfuric acid and liquid alkali consumption, reduces carbon emission, with good economic and environmental benefits.

This invention discloses a method for recycling and processing waste lithium iron phosphate (LFP) cathode sheets, comprising: crushing and sieving the cathode sheets of waste LFP batteries to obtain LFP cathode powder; selectively dissolving aluminum using a prepared eutectic solvent, washing the resulting solid phase to obtain the LFP cathode powder required for regeneration, and electrolytically depositing the leachate to obtain metallic aluminum and electrolyte. This invention utilizes the selective dissolution property of the prepared eutectic solvent on aluminum, achieving the effect of removing aluminum without altering the LFP phase through wet leaching, thus enabling the waste LFP cathode powder to undergo further regeneration.