2362results about "Photography auxillary processes" patented technology

The invention discloses a method for synchronously improving the recovery rate of copper and cobalt in high-oxidation-rate copper-cobalt ore and low-grade copper oxide-cobalt concentrate, which comprises the following steps: (1) carrying out copper sulfide flotation on the high-oxidation-rate copper-cobalt ore to obtain high-copper tailings; (2) the low-grade copper-cobalt concentrate and the high-copper tailings are mixed according to the mass ratio of 1: (1-2), and mixed ore is obtained; (3) the obtained mixed ore and a sulfuric acid solution system leaching agent are stirred and mixed, and slurry is obtained; (4) leaching the obtained slurry at normal temperature, and carrying out solid-liquid separation to obtain leached residues and leached liquid; (5) carrying out washing, extraction, reverse extraction and electrodeposition on the obtained leaching residues to obtain metal copper; and removing iron from the raffinate, and adding magnesium oxide into the iron-removed liquid for precipitation to obtain crude cobalt hydroxide. According to the method, the high-copper tailings and the low-grade copper oxide cobalt concentrate are subjected to the processes of ore blending, size mixing, normal-temperature sulfuric acid leaching and the like, the final copper leaching rate is 95% or above, and the cobalt leaching rate is 70% or above.

A process for electrowinning a metal using a flow-through electrowinning apparatus can include the steps of: a) conveying an anolyte material and a metal chemical feedstock material along an anolyte flow path within an anolyte chamber; b) conveying catholyte material along a catholyte flow path within a catholyte chamber that has a cathode; c) applying an activation electric potential between the anode and a cathode that is sufficient to electrolyze and liberate metal ions from the metal chemical feedstock material in the anolyte chamber, thereby causing a flux of metal ions to migrate through a porous membrane from the anolyte chamber to the catholyte chamber and a metal product to be formed in the catholyte chamber; and while applying the activation electric potential, extracting a feedstock-depleted anolyte material from the anolyte chamber; and extracting an outlet material comprising the catholyte material and the metal product from the catholyte chamber via a catholyte outlet.

The invention discloses a composite electrode material for removing uranium through photoelectrocatalysis and a preparation method and application of the composite electrode material, and belongs to the technical field of catalytic materials and wastewater treatment.The preparation method of the composite electrode material comprises the following steps that a ZIF-8 material, copper salt and ferric salt are mixed, and a first metal composite material is prepared; reacting the first metal composite material with a KOH solution to prepare a second metal composite material; carrying out carbonization treatment on the second metal composite material, and then carrying out acid treatment by using acid to obtain a bimetallic atom catalytic material; the preparation method comprises the following steps: dispersing a bimetallic atom catalytic material and a g-C3N4 material in a mixed solution containing phytic acid and a Nafion solution to obtain catalyst ink; and coating the catalyst ink on a substrate, and carrying out illumination drying to obtain the composite electrode material. According to the composite electrode material, under the synergistic effect of the bimetallic single atomic cluster catalyst and g-C3N4, respective advantages are fully exerted, and efficient deposition removal of uranium is achieved.

The invention relates to a ceramic electroplating wastewater treatment and metal recovery process which is characterized by comprising the following steps: collecting ceramic electroplating wastewater in a classified manner; carrying out pretreatment on the ceramic electroplating wastewater, and carrying out split-flow treatment on the pretreated ceramic electroplating wastewater according to categories; merging the pretreated cyanide-containing wastewater and the pretreated chromium-containing wastewater into the general electroplating wastewater to form comprehensive wastewater, and carrying out flocculent precipitation treatment; carrying out adsorption and reverse osmosis treatment to obtain purified water reaching the standard; the metal-containing sludge is subjected to acid leaching treatment, and metal elementary substances are recycled through an electrolytic method after dissolution. Through classified collection and multi-stage pretreatment technologies, ceramic suspended solids are accurately separated, and cyanogen-containing and chromium-containing wastewater is treated in a differentiated manner; a split-flow combined reaction system is innovatively adopted, and a composite biological adsorption filler and an acid leaching-electrolysis coupling process are combined, so that the problem of synergistic removal of multi-element pollutants is solved, and targeted recovery of heavy metals is realized.

The invention provides a treatment method of copper-nickel concentrate rich in platinum group metals, which comprises the following steps: feeding the copper-nickel concentrate rich in platinum group metals and a first flux into a smelting furnace, and introducing first oxygen-enriched gas for smelting; copper matte and a second flux are continuously fed into a first converting furnace, and second oxygen-enriched gas is continuously introduced for first converting; raw copper and a third flux are fed into the oxygen inclined blowing rotary converter, and oxygen is introduced for second blowing; the crude copper is fed into an anode refining furnace, and air and a first reducing agent are introduced for fire refining; casting the copper liquid into an anode plate, and carrying out electrolytic refining on the anode plate; feeding the first converting slag, the second converting slag, a second reducing agent and a vulcanizing agent into a dilution electric furnace for slag dilution to obtain low-nickel matte and dilution slag; and the low-nickel matte is fed into a third converting furnace, air or oxygen-enriched air is introduced for third converting, and the problem that the recovery rate of nickel metal elements and platinum group metals in the copper-nickel concentrate rich in the platinum group metals is low is solved.

Methods are proposed for fabricating highly pure lithium metal electrodes from aqueous lithium salt solutions by means of electrolysis through lithium ion selective membranes, performed at constant current densities between about 10 mAh / cm2 and about 50 mAh / cm2, and wherein the constant current is applied for a time between about 1 minute and about 60 minutes. The electrolysis is performed under a blanketing atmosphere, the blanketing atmosphere being substantially free of lithium reactive components. Methods are further proposed for vertically integrating the electrolytic fabrication of highly pure lithium metal electrodes into the production of lithium metal batteries, the fabrication of lithium electrodes and lithium metal batteries being performed in a single facility.

The present invention belongs to the technical field of electrolytic copper foil. The present invention provides an electrolyte for ultra-thin electrolytic copper foil, in which the mass concentration of copper sulfate is 175-260 g / L, the mass concentration of inorganic acid is 80-100 g / L, the mass concentration of additive is 1-5 g / L, the mass concentration of complexing agent is 3-8 g / L, the mass concentration of conductive polymer is 0.5-3 g / L, and the mass concentration of hydrolyzed collagen is 0.1-0.5 g / L. The present invention also provides an ultra-thin electrolytic copper foil and a preparation method thereof. The present invention significantly reduces the thickness and roughness of the copper foil by controlling the components of the electrolyte and their concentrations and the electrodeposition process parameters, while improving the mechanical properties, antioxidant properties and electrochemical properties of the copper foil. The ultra-thin copper foil of the present invention can be produced continuously without tearing, achieving a double breakthrough in the ultra-thin thickness and mechanical properties of the copper foil.

The invention discloses a process for extracting copper from low-copper-content waste liquid and treating wastewater, and relates to the field of circuit board production waste liquid treatment.The process sequentially comprises the specific steps of waste liquid mixing, electrolytic additive adding, circulating mixing, electrolytic copper extraction, copper ion concentration detection and wastewater treatment. Meanwhile, the equipment universality is high, copper-containing complexes can be degraded, up-to-standard discharge of wastewater can be easily achieved, elemental copper generated in the electrolysis process has certain economic benefits, and the method is suitable for application and popularization.

The invention provides a treatment method for low-grade multi-metal gold concentrate, and relates to the technical field of comprehensive utilization of minerals. According to the treatment method of the low-grade multi-metal gold concentrate, most of iron and copper form iron-copper matte through pyrogenic smelting, meanwhile, gold is captured into the iron-copper matte, then iron-copper matte powder is obtained after water quenching and ball milling, the iron-copper matte powder is subjected to oxidation ammonia leaching, copper in the iron-copper matte is extracted, and the iron-copper matte powder is subjected to oxidation ammonia leaching to obtain the low-grade multi-metal gold concentrate. The obtained copper-containing ammonia leaching liquid is subjected to a traditional extraction-reverse extraction-electrodeposition process to obtain an electrodeposited copper product, ammonia leaching residues obtained after copper extraction are subjected to cyanidation leaching, gold in the ammonia leaching residues is extracted, cyanidation liquid is subjected to a traditional gold extraction process to obtain a gold product, the cyanidation tailings mainly comprise iron sulfide, the content of iron and sulfur in the tailings is high, and the content of sulfur in the tailings is high. And the subsequent cinder can be directly sold as an iron-making raw material. The amount of iron-silicon slag generated by the method is extremely low, and compared with a traditional molten pool smelting method, the comprehensive utilization rate of iron in the multi-metal gold concentrate is greatly increased.

The invention provides a carbon dioxide capture and absorbent purification system and method coupled with metal refining. The system comprises an absorption module with an absorbent, a regeneration module with an electrolytic absorption unit and a gas-liquid separation unit, and a purification module, the absorption module is communicated with flue gas; the regeneration module and the purification module are selectively communicated with the absorption module so as to selectively regenerate and purify the absorbent; the electrolytic suction unit comprises a first anode chamber provided with a crude copper anode and a first cathode chamber provided with a refined copper cathode; a first outlet of the absorption module is communicated with an inlet of the first anode chamber, and a second outlet of the absorption module is communicated with a purified gas pipeline; an inlet of the gas-liquid separation unit is communicated with the first anode chamber, a first outlet of the gas-liquid separation unit is communicated with the first cathode chamber, and a second outlet of the gas-liquid separation unit is communicated with an exhaust pipeline; and the outlet of the first cathode chamber is communicated with the second inlet of the absorption module. The system is high in energy efficiency, low in energy consumption, low in cost and high in trapping efficiency.

The invention relates to the technical field of metallurgy, in particular to an efficient-utilization copper-cobalt ore dump leaching treatment method which comprises the steps that after copper-cobalt sulfide ore and copper-cobalt oxide ore are subjected to crushing treatment respectively, heap building is conducted; a solution of acidithiobacillus ferrooxidans is added into a sulfuric acid solution to serve as spraying liquid, heap leaching treatment is conducted on the heap-built copper-cobalt ore through a spraying device, and the spraying flow of the spraying device is controlled in the heap leaching treatment process according to changes of the environment temperature and humidity and changes of the pH value of heap leaching liquid; the obtained dump leaching liquid is subjected to extraction-electrodeposition treatment, and cathode metal copper, sediment and raffinate are obtained; and the raffinate serves as spraying liquid to be subjected to spraying circulation, precipitation is neutralized, and metal cobalt is recycled. The spraying flow of the spraying device is accurately controlled and adjusted, and the leaching effect of copper and cobalt metal in the copper-cobalt ore is improved.

Described herein are methods of recovering lithium from dilute lithium sources. The methods include extracting lithium from an extraction feed using direct lithium extraction in an extraction stage to yield a lithium intermediate, performing one or more concentration operations, each concentration operation concentrating an input stream to yield an output feed, wherein the input stream is obtained from the lithium intermediate and / or the extraction feed is obtained from the output feed. At least one of the concentration operations includes a membrane separation operation having a plurality of reactors in series each having a semi-permeable membrane, such as a counter-flow reverse osmosis operation. Methods may also include generating a low TDS stream as a permeate from any of the one or more concentration operations, wherein the low TDS stream is recycled or used as fresh water.

The invention provides an impurity removal and recovery method of electrodeposited nickel anolyte, which comprises the following steps: (1) mixing the electrodeposited nickel anolyte with liquid caustic soda, carrying out solid-liquid separation to obtain nickel hydroxide and filtrate, and evaporating the filtrate to obtain sodium sulfate; mixing the electrodeposited nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt, and carrying out lead removal treatment; (3) adjusting the pH value of a material obtained after lead removal treatment by using nickel hydroxide to obtain a solution to be subjected to arsenic removal, and mixing the solution to be subjected to arsenic removal with polyferric sulfate for arsenic removal treatment; and (4) a material obtained after arsenic removal treatment is mixed with an oxidizing agent, a solution to be subjected to iron removal is obtained, solid-liquid separation treatment is conducted on the solution to be subjected to iron removal, catholyte with lead, arsenic and iron removed and iron-containing slag are obtained, sodium sulfate is supplemented into the catholyte with lead, arsenic and iron removed, and the catholyte is reused in the nickel electrodeposition process. According to the method, lead, arsenic and iron in the electrodeposited nickel anolyte can be efficiently and rapidly removed and recycled.

The invention provides a treatment method of a nickel sulfate solution, and relates to the technical field of non-ferrous metal smelting. The treatment method of the nickel sulfate solution comprises a neutralization procedure, an extraction and oil removal procedure, an electrodeposition procedure and a nickel deposition procedure, in the neutralization procedure, a nickel deposition material generated by anolyte deposition in the nickel deposition procedure serves as a neutralizer to adjust the pH value back, and the solution obtained after neutralization and impurity removal is subjected to extraction, oil removal and electrodeposition to obtain anolyte. And continuously precipitating the anolyte to obtain a nickel precipitation material. The first solid produced by the treatment method of the nickel sulfate solution can be used for pyrogenic production of high matte nickel and electrodeposition procedures, part of impurities in raw materials can be discharged out of a system through the first solid, no dangerous waste residue is produced, and therefore the number of needed filter presses, the number of solid residue filter pressing times and the residue discharging workload are reduced. As calcium powder is not used for neutralization in the neutralization process, the problem of pipeline blockage caused by precipitation of saturated calcium is reduced.

The invention discloses a method for controlling ion concentration and volume balance in an electrolyte by using nickel hydroxide. The method comprises the following steps: preparing a reaction base solution containing a first complexing agent and a first alkali; the first anolyte, a second complexing agent solution and a second alkali solution are simultaneously added to the bottom of the reaction base solution for stirring reaction, solid-liquid separation is performed after nickel hydroxide reaches the target particle size, and filtrate and a filter cake are obtained; washing the filter cake, and slurrying the filter cake by using a second anolyte to obtain a nickel hydroxide slurrying material; and adjusting the sodium ion concentration, pH and nickel ion concentration of the third anolyte by adopting a sodium hydroxide solution, a nickel hydroxide slurrying material and a nickel sulfate solution to obtain the catholyte. According to the invention, a feeding mode of feeding at the bottom is adopted, and a complexing agent is matched, so that crystals can stably grow and are convenient to filter; in the preparation process, aging and too high pH conditions are not needed, operation is simpler, labor intensity is small, the reaction rate is higher, and continuous treatment of the anolyte can be achieved.

The present disclosure relates to an electrochemical device for extracting copper from copper-containing wastewater and an extraction method using the same. Cu-based chalcogenide, as an electrode material, forms an electrochemical device with other electrodes. The device is an electrocatalytic coupling deionization system with electrochemical oxidative decomplexing performance, and has a good selective removal effect of Cu2+ from organic complex copper-containing wastewater, strongly acidic wastewater, and wastewater interfered by high concentration salt ions and heavy metal ions. With this device, the organic complex pollutant Cu-EDTAn can be effectively decomplexed to complete the extraction of Cu2+.

An electrochemical reactor, including a channel for containing and directing flow of an electrolyte stream, wherein the electrolyte stream includes an electrolyte and an iron-containing feedstock; an anode and a cathode positioned in contact with the channel; and a source of a magnetic field positioned in proximity to the cathode, wherein the electrochemical reactor is configured to electrochemically reduce at least a portion of the iron-containing feedstock to iron metal at a surface of the cathode and in a magnetic field of the source, and wherein the at least a portion of the iron-containing feedstock is electrochemically reduced to the iron metal at a current efficiency of at least 0.75, wherein the current efficiency is a ratio of charge used for the reduction of the iron-containing feedstock to a total charge provided to the cathode.

The invention relates to the technical field of industrial waste treatment and silver nitrate preparation, in particular to a method for preparing high-purity silver nitrate from silver-containing waste. The method comprises the following steps: reducing the silver-containing waste by adopting a liquid phase reduction method, pickling to remove impurities, putting the silver-containing waste into a medium-frequency induction furnace, performing high-temperature smelting and ingot casting, performing electrolytic purification to obtain crude silver powder, and performing smelting and ingot casting on the crude silver powder to obtain a raw material national standard No.1 silver ingot for preparing silver nitrate; the method comprises the following steps: putting a national standard No.1 silver ingot and a nitric acid solution into a reaction kettle according to a certain proportion for dissolving silver, carrying out adsorption and impurity removal on a dissolved solution through ion exchange resin, carrying out adsorption and impurity removal on a primary filtrate through chelating type adsorption resin, and carrying out centrifugation, evaporative crystallization, drying and other processes on a secondary filtrate to obtain the high-purity silver nitrate. The method is easy to implement, the recovery rate of the silver-containing waste materials is high, the high-purity silver nitrate product can reach the premium-grade pure standard, and the technological process is environmentally friendly.

The invention belongs to the field of electronic wastes, and particularly relates to a waste circuit board recycling and reusing method which comprises the following steps: step 1, a preliminary decomposition stage of a waste circuit board: decomposing the waste circuit board into fragments suitable for follow-up treatment through a mechanical crushing and screening physical method; 2, a chemical leaching stage: dissolving metal components in the waste circuit board from the fragments by using a chemical solvent; 3, a metal recovery and separation stage: reducing metal ions dissolved in the solution into metal by adopting an electrolytic method; step 4, a harmful substance removal stage: removing harmful substances in the waste circuit board; 5, a resource reutilization and comprehensive utilization stage: through a recovery system unit, the recovered metal, plastic substrates and electronic component materials are extracted and utilized, and a feedback control system optimizes the resource recovery efficiency according to real-time data; and step 6, closed-loop treatment and environment-friendly compliance stage: treating wastewater, waste gas and solid waste through a closed-loop system unit.

The invention relates to a method for preparing electrolytic nickel through normal-pressure and high-pressure combined leaching of high-nickel matte, and belongs to the technical field of metal separation and enrichment. The method for preparing the electrolytic nickel through normal-pressure and high-pressure combined leaching of the high-nickel matte mainly comprises the steps of raw material preparation, normal-pressure leaching, solid-liquid separation, high-pressure reaction, metal recovery, impurity removal treatment and filtration and electrodeposition. According to the method for producing the electrolytic nickel through normal-pressure leaching and pressure leaching of the high-nickel matte, the risk that impurities are increased due to the fact that other production auxiliary materials are used is reduced, in the leaching process, steam, compressed air, normal pressure and pressure are optimized and combined innovatively, and leaching of nickel in the high-nickel matte is increased to the maximum extent. Black nickel generated in a production system is used for removing cobalt for the first time, it is guaranteed that the nickel content in the system reaches the standard while impurities are not increased, and meanwhile anode liquor obtained after electrodeposition enters an initial slurrying tank to be recycled.

The invention provides a method for coupling vanadium extraction through ore pulp electrolysis and new energy utilization. The method comprises the following steps: step 1, crushing a vanadium-containing raw material; step 2, adding a leaching agent into the crushed vanadium-containing raw material, and stirring to obtain ore pulp; 3, the ore pulp is placed in an anode of an electrolytic bath, and an oxidation state substance is added into a cathode of the electrolytic bath; step 4, turning on a power supply, carrying out oxidation reaction on vanadium at the anode of the electrolytic cell, and dissolving the vanadium into the solution by the leaching agent at the same time; and the cathode oxidation-state substance is reduced in the electrolytic bath to obtain a reduction-state substance. According to the green vanadium extraction method, vanadium is leached out through ore pulp electrolysis, electrolytic bath anodic oxidation and a leaching agent. When the oxidation-state substance is water or CO2, the method not only realizes reduction of hydrogen or carbon dioxide, but also replaces an anode oxygen evolution process with an oxidation leaching process of vanadium, so that the cost is remarkably reduced.

The invention discloses a method for recovering nearly all elements in low-precious-metal zinc replacement powder, which belongs to the technical field of non-ferrous metal wet smelting, and comprises the following steps: preparing zinc replacement powder, oxidizing and leaching, extracting copper, preparing cuprous chloride, electrodepositing zinc in raffinate, extracting precious metal by using a gold extracting agent, extracting, reducing and smelting to prepare a gold ingot and a silver ingot, and dissolving by using sodium hydroxide. Preparing lead carbonate; carrying out oxidation acid leaching; replacing; and smelting bismuth. According to the technology for achieving recovery and high-value utilization of nearly all elements in the zinc replacement powder under the mild condition, the technology can be carried out at the normal temperature, the high-pressure condition does not need to be provided, the zinc replacement powder is leached through the acid solution, then various valuable metals are selectively extracted from the leaching solution, corresponding downstream products are prepared, and the method is suitable for industrial production. The method realizes value maximization, does not generate secondary pollution, does not introduce fluorine, has low requirements on equipment, is simple in process and easy to operate, and makes up for the defects of the zinc replacement powder treatment process in the prior art.

The invention discloses a preparation method of a 3-micron ultrathin lithium battery copper foil. The preparation method comprises the following steps: preparing a copper sulfate electrolyte; a wetting agent, a brightening agent and a high resistance agent are added into the copper sulfate electrolyte, the high resistance agent is at least one of thiazolidinethione, polyethyleneimine, 2-mercaptobenzimidazole and ethylene thiourea, and a mixed additive is formed; polishing and grinding a cathode roller by adopting a flying wing wheel, and carrying out electrolytic treatment on the mixed additive through the polished and ground cathode roller to obtain a first-stage copper foil; and the first-stage copper foil is placed in a nitrogen furnace to be subjected to annealing treatment, and the 3-micron ultrathin lithium battery copper foil is obtained. The invention aims to solve the technical problems that in the prior art, edge tearing, foil breaking, warping, dark appearance oxidation and the like are prone to occurring in the production process of the ultrathin copper foil, the tensile strength and the ductility are difficult to consider at the same time, and stable mass production of the 3-micron copper foil is still difficult.

The invention relates to an electrode material for lithium extraction, a preparation method of the electrode material, a lithium extraction electrode and a lithium extraction system, belongs to the field of salt lake lithium extraction, and solves at least one of the problems of fast capacity fading, relatively low overall lithium extraction efficiency and short service life of a lithium extraction electrode for an alkaline solution in the prior art. A preparation method of an electrode material for lithium extraction comprises the following steps: mixing an electrode active material with a rare earth salt solution, and forming a phosphate rare earth layer on the surface of the electrode active material in an in-situ coating manner; the electrode active material comprises lithium iron phosphate and a doped derivative thereof. When the preparation method, the obtained electrode material, the lithium extraction electrode and the lithium extraction system are applied to lithium extraction of salt lake brine, especially alkaline brine, at least one of the cycle performance, the lithium extraction efficiency and the service life is remarkably improved.

The invention relates to a process for extracting iron from red mud by using hydrogen reduction and electrolysis technologies, the red mud is a by-product generated in the industrial production process of aluminum, the environmental burden caused by the by-product can be solved, the carbon emission can be reduced, and the development of a green metallurgical technology can be promoted. Comprising the following steps: conveying red mud serving as a raw material into a rotary furnace, conveying hydrogen serving as a reducing medium into the rotary furnace, enabling iron oxide in the red mud to form hydrogen reduced iron in a furnace heating state and a hydrogen reducing atmosphere, conveying the red mud containing the hydrogen reduced iron into a sulfuric acid solution, the hydrogen reduced iron is dissolved in the sulfuric acid solution to form a sulfuric acid solution containing iron ions, the sulfuric acid solution containing the iron ions serves as an electrolyte in an electrolysis device, and electrolytic pure iron formed by electrolytic deposition of the iron ions is obtained through the electrolysis device.

The invention discloses a method for preparing high-purity bismuth based on a fluorosilicic acid system and high-purity bismuth. In view of the problem of high impurity content in the new electrolytic solution in the electrolysis of the fluorosilicic acid system to prepare high-purity bismuth, chemically pure fluorosilicic acid, water with an electrical conductivity of less than 10 μS / cm, hydrogen peroxide that meets the 27.5% superior product standard of GB / T 1616-2014, and bismuth powder containing impurities that meets the Bi99.99 standard in GB / T 915-2010 and has a mesh number of 80 to 325 meshes are used as raw materials, and the impurities are controlled from the source to prepare a solution with a fluorosilicic acid concentration of 60 to 80 g / L and a bismuth ion concentration of 140 to 160 g / L. Then the obtained liquid-making solution is electrified under certain conditions to remove impurities, and an electrified impurity-removing solution is obtained. The electrified impurity-removing solution is then further impurity-removed by adding fluorosilicic acid to further reduce the impurity content of the solution. Finally, gelatin and β-naphthol solution are added to prepare a low-impurity electrolyte with a low impurity content. The low-impurity electrolyte prepared by the present technical invention can be used for electrolytic preparation of high-purity bismuth above 5N.

A method for regeneration of waste lithium iron phosphate positive electrode sheets, and a regenerated lithium iron phosphate positive electrode sheet. By means of an electrochemical mode, the method enables lithium iron phosphate to be regenerated without any damage to the structure thereof; the method avoids the discharge of acid-alkali wastewater in large quantities during a wet recovery process, and also avoids the problem of reduced activity of lithium iron phosphate due to the lattice changes in the lithium iron phosphate caused by aerobic calcination during a pyrogenic recovery process; moreover, the process is simple, lithium iron phosphate does not need to be stripped from positive electrode sheets, a positive electrode sheet is directly obtained after regeneration, and a binder, a conductive agent, etc., in the positive electrode sheet do not need to be additionally replenished; and the performance of a regenerated lithium iron phosphate positive electrode material is equivalent to that of the initially prepared lithium iron phosphate positive electrode material.

The present disclosure relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products. Herein are systems and processes for extracting lithium using ion exchange materials, where transition metal impurities may be removed from the synthetic lithium solution. In some embodiments, the transition metal species are reformulated to form ion exchange materials to be used in the systems and processes described herein.

An electrochemical reactor system includes: an electrochemical cell, having: an anode; a cathode; an electrolyte stream including an electrolyte and an iron-containing feedstock containing feedstock particles; and a channel that contains the electrolyte stream; and a magnetic field source positioned to provide a magnetic field at the surface of the cathode. The electrochemical cell electrochemically reduces the iron-containing feedstock to form iron particles at a surface of the cathode and in the magnetic field. The feedstock particles have an average particle size in at least one dimension of 10 micrometers or less, and the iron particles have an average particle size in at least one dimension of 50 to 1,000 micrometers, or the feedstock particles have an average particle size in at least one dimension of 25 micrometers or greater, and the iron particles have an average particle size in at least one dimension of 0.1 to 20 micrometers.

The invention discloses a device and a method for recycling gold ions in copper ammonia thiosulfate leachate, and belongs to the technical field of hydrometallurgy and precious metal recycling. An anode chamber and a cathode chamber which are physically and spatially isolated are built, so that the reduction reaction of the gold ions is only carried out in the cathode chamber, and only the oxidation reaction of metal zinc is carried out in the anode chamber. In order to avoid deposition of copper ions in the gold ion reduction process, before gold deposition, the existence form of the copper ions is regulated and controlled, Cu (NH3) 4 < 2 + > in a solution is converted into Cu (S2O3) 35 <-> which is difficult to deposit, then gold deposition is carried out, and after gold deposition is completed, the Cu (S2O3) 35 <-> in the solution is recovered to Cu (NH3) 4 < 2 + > by means of regulation and control of an electrochemical method. And the solution after gold ion deposition can be returned to the leaching stage for recycling under the condition that the copper ion concentration is not interfered.