33results about How to "Improve leaching effect" patented technology

The invention discloses a method for leaching precious metal through catalytic oxidation of thiosulfate, which comprises the following steps: mixing a copper-containing catalytic system-thiosulfate solution with a precious metal-containing material, and carrying out leaching reaction to obtain a precious metal leachate; wherein a copper-containing catalytic system in the copper-containing catalytic system-thiosulfate solution is a copper-iminodiacetic acid complex. The precious metal is extracted by adopting a copper-iminodiacetic acid catalytic system, the leaching rate of the precious metal and the consumption of thiosulfate can be considered, the leaching effect is remarkably superior to that of an existing copper ammonia system, and industrial application is easy to achieve.

The invention discloses a method for leaching rare earth elements in neodymium iron boron waste through synergistic reinforcement of sulfating roasting and a surfactant, and belongs to the technical field of rare earth recovery. The method comprises the following steps: mixing neodymium iron boron waste and concentrated sulfuric acid to prepare a roasting raw material; carrying out roasting treatment on the roasted raw material to obtain a roasted product; the roasted product and a leaching agent are mixed and then leached and filtered, filter residues and filtrate are prepared, and the filtrate is directly used for separation of rare earth elements leached from the neodymium iron boron waste; the leaching agent at least comprises two surfactants. According to the method provided by the invention, multiple surfactants are compounded and cooperate with the sulfating roasting process, so that the leaching rate of the rare earth can be effectively improved, the acid consumption can be reduced, and the purpose of improving the recovery purity of the rare earth element can be achieved; in addition, the compound surfactant is simple in preparation method and convenient to use, and the neodymium iron boron waste recovery cost is reduced to a large extent.

The invention discloses a method for recovering valuable metals in a retired ternary lithium battery based on cascade separation of a deep eutectic solvent and oxalic acid. The method comprises the following steps: 1) stirring and leaching the deep eutectic solvent and black powder at 110-130 DEG C for 3-4 hours according to a liquid-solid ratio of (5-50): 1 (ml: g) to obtain a leaching solution; (2) measuring the contents of lithium, cobalt, nickel and manganese in the leachate according to ICP (Inductively Coupled Plasma), adding oxalic acid exceeding the required amount according to the contents of lithium, cobalt, nickel and manganese, stirring, standing, and centrifuging to obtain a precipitate mixture of nickel oxalate precipitate, cobalt oxalate precipitate and manganese oxalate precipitate and lithium filtrate; and (3) repeating the steps (1)-(2) for at least three times by taking the lithium filtrate obtained at each time as the eutectic solvent, performing rotary evaporation on the obtained final lithium filtrate, adding sodium carbonate, and centrifuging to obtain lithium carbonate precipitate. The purity of the ternary lithium precursor prepared from cobalt, nickel and manganese obtained through the method can reach 99% or above, the purity of obtained lithium carbonate reaches 95% or above, and closed-loop recycling is achieved.

The invention discloses a method for improving the manganese leaching rate and a manganese leaching process, and belongs to the technical field of manganese extraction.The method comprises the steps that after the water content of mineral aggregate is adjusted to be 10% or above, microwave pretreatment is conducted; adding an auxiliary agent polyvinylpyrrolidone into the mineral aggregate subjected to microwave treatment; mixing the mineral aggregate added with polyvinylpyrrolidone with water, carrying out wet grinding, and adding ultrasonic treatment in the wet grinding process to obtain ore pulp; concentrated sulfuric acid, water and the obtained ore pulp are mixed for sulfuric acid leaching treatment; and after the sulfuric acid leaching treatment reaction is completed, solid-liquid separation is carried out, and a leaching solution with the high manganese content is obtained. The method can improve the manganese leaching rate of the manganese ore.

The invention provides a leaching solution and method for uranium ore acid leaching, and particularly relates to the technical field of hydrometallurgy, and the leaching solution comprises an acid compound, an oxidizing agent, a fluorine salt compound and water. And leaching the uranium ore by adopting the leaching solution. During acid leaching, an oxidizing agent provides high oxidation potential to oxidize tetravalent uranium ores into hexavalent uranium ores, and hexavalent uranium ions and sulfate radicals are complexed and dissolved out; the fluorine ions react with S to release tetravalent uranium, the contact probability of the tetravalent uranium and the oxide is increased, the uranium leaching effect is enhanced, and the leaching rate is remarkably improved compared with an existing acid leaching method.

The invention belongs to the field of resource recovery, and discloses a preparation method of germanic acid, which comprises the following steps: step 1, mixing germanium-containing soot and alkali liquor to obtain slurry A, and carrying out solid-liquid separation after the slurry A reacts to obtain germanium-containing leachate and leaching residues; and step 2, continuously introducing CO2 into the germanium-containing leachate to obtain slurry B, and carrying out solid-liquid separation on the slurry B to obtain a precipitation material, namely germanic acid. According to the method, the carbon dioxide and the germanium-containing leachate are reacted, impurity cations are prevented from being introduced, the concentration of germanic acid is increased, the reaction can be carried out under the condition that the pH value is 6-7, the pH value of a reaction system does not need to be adjusted before the reaction, or the pH value range of the reaction system needing to be adjusted is greatly reduced, raw materials are saved, the process is simplified, and popularization and industrialization are facilitated.

The invention belongs to the technical field of metallurgy, and particularly relates to an electrochemical dissolution method and device for promoting dissolution of high-temperature alloy, and the electrochemical dissolution device comprises an electrolytic bath, an anode plate, a cathode plate, a pore plate, a vibration basket, a vibrator, a stirrer, an oxygen generator and a heating and circulating pump; an electrochemical dissolving device is adopted, a titanium plate serves as an anode plate, a graphite plate or an iridium ruthenium plate serves as a cathode plate, an electrolyte is added into an electrolytic bath, the waste high-temperature alloy is placed into a vibration basket, an oxidizing agent is introduced into the electrolytic bath, electrolysis at 70 DEG C is conducted under the stirring and vibration conditions, filtering separation is conducted, and the waste high-temperature alloy is obtained. And electrolyte and anode mud are obtained. The method has the advantages of efficient metal dissolution, short recovery period and good recovery effect.

The invention provides a treatment method of nickel-cobalt hydroxide, which comprises the following steps of: leaching the nickel-cobalt hydroxide by using a leaching agent containing ionic liquid and chloride, and filtering to obtain leachate and leaching residues; adding iron powder or manganese powder into the leachate to remove copper, and filtering to obtain copper sponge and copper-removed liquid; adding an alkaline regulator into the copper-removed liquid, and filtering to obtain iron and aluminum-removed liquid and iron and aluminum slag; carrying out counter-current extraction on the iron and aluminum removed liquid and P204 to obtain manganese-rich organic liquid and manganese extraction residual liquid; carrying out reverse extraction on the manganese-rich organic liquid with dilute sulfuric acid to obtain a manganese sulfate solution, wherein the manganese sulfate solution is used for preparing a ternary precursor or manganous-manganic oxide; carrying out countercurrent extraction on the manganese extraction raffinate and the co-extraction organic solvent to obtain a nickel-cobalt-loaded organic solvent and raffinate; carrying out reverse extraction on the nickel-cobalt-loaded organic solvent by dilute sulfuric acid to obtain a nickel-cobalt sulfate solution; the nickel-cobalt sulfate solution is used for preparing the ternary precursor after being deoiled. The nickel-cobalt hydroxide treatment method provided by the invention is low in auxiliary material consumption, low in treatment cost, green and environment-friendly.

The present invention relates to the technical field of lithium ion battery recycling, and more specifically, to a high-efficiency impurity removal and recycling process for lithium ion batteries. The process comprises the following steps: preparation of a high-efficiency leaching agent; grading of lithium batteries; pretreatment of negative electrode plates; and recycling of plate materials. The present invention can simultaneously achieve leaching of lithium iron phosphate and regenerate graphite black powder while leaching metal ions by preparing a high-efficiency leaching agent. 2+ is oxidized to Fe 3+ , and precipitates into iron hydroxide when sodium carbonate solution is added later, while lactic acid in the high-efficiency leaching agent leaches nickel, cobalt, manganese and lithium cobalt oxide positive electrode materials. The process is simple and can recycle a variety of waste lithium battery components at the same time, with high recycling efficiency, good leaching effect of various metal components and high leaching rate.

The present invention belongs to the field of metallurgy technology, and specifically relates to an electrochemical dissolution method and device for promoting the dissolution of high-temperature alloys. The electrochemical dissolution device includes an electrolytic cell, an anode plate, a cathode plate, a perforated plate, a vibration basket, a vibrator, a stirrer, an oxygen generator, a heating and circulating pump; the electrochemical dissolution device is adopted, a titanium plate is used as an anode plate, a graphite plate or an iridium ruthenium plate is used as a cathode plate, an electrolyte is added to the electrolytic cell, and waste high-temperature alloys are placed in the vibration basket. The waste high-temperature alloys are nickel-based alloys, iron-based alloys or cobalt-based alloys, an oxidant is introduced into the electrolytic cell, and electrolysis is performed at 70°C under stirring and vibration conditions, and filtration and separation are performed to obtain electrolyte and anode mud. The advantages are: high-efficiency dissolution of metals, short recovery cycle, and good recovery effect.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a dump leaching treatment process for argillaceous low-grade uranium-containing molybdenum ore. The argillaceous low-grade uranium-containing molybdenum ore is subjected to crushing treatment, and mineral fine materials are obtained; granulating the mineral fine material, concentrated sulfuric acid and water, and curing to obtain a cured material; and roasting the cured material at the temperature of 250-500 DEG C, and then carrying out cooling, heap building and acid leaching treatment to obtain a leachate enriched with molybdenum and uranium. According to the technology, the physical and chemical structure of the mineral is optimized, the problems that the mineral is prone to argillization and fine dissemination can be solved, the leaching rate of the mineral can be improved, especially the permeability of an ore heap under a high heap can be improved, and the leaching effect under the high heap is achieved. The method is low in total investment and treatment cost, high in uranium and molybdenum concentration in the leachate, short in process and easy to realize industrial application.

The invention belongs to the field of uranium ore treatment, and particularly relates to an alkaline argillaceous sandstone type uranium ore dump leaching treatment method which comprises the following steps: crushing alkaline argillaceous sandstone type uranium ore to obtain fine ore; mixing the fine crushed ore with an alkaline component and a curing aid, and curing; then carrying out roasting treatment at the temperature of 250 to 400 DEG C; an alkaline aqueous solution is adopted as a cooling medium to conduct spraying cold quenching on the roasted product, and pretreated ore is obtained; the curing auxiliary agent is a component with oxidability; and heaping the pretreated ore, and then carrying out alkaline leaching treatment by adopting an alkaline leaching agent. Through combination of curing-roasting and cold quenching, the physical and chemical structure can be optimized, the problems of poor permeability, liquid accumulation and the like of fine-grained alkaline argillaceous sandstone type uranium ore can be solved, and the leaching effect of uranium can be improved.

The invention discloses a method for recovering tungsten in lepidolite concentrate, which comprises the following steps: S1, mixing the lepidolite concentrate and a roasting additive to obtain a mixture A; the roasting additive comprises a lithium extraction additive and a tungsten extraction additive; s2, grinding the mixture A to obtain a mixture B, and granulating to obtain lepidolite concentrate particles; s3, roasting the lepidolite concentrate particles to obtain a mixture C; and S4, the mixture C is subjected to water leaching, and leaching residues and leaching liquid are obtained after filtering. According to the method, synergistic leaching of lithium and tungsten can be effectively achieved, and the tungsten recovery rate can reach 80% or above on the premise that the lithium extraction technology is not affected.

The invention discloses a method and a device for preparing hydrophosphate based on battery powder lithium extraction slag, an operation mode of multi-stage series countercurrent leaching-segmented precise feeding-deep impurity removal and purification-closed cycle crystallization is adopted, a leaching agent adopts first-stage and second-stage segmented feeding in the leaching process, the mass transfer efficiency is greatly enhanced, and the leaching efficiency is improved. The leaching effect of the leaching agent is maximized, the leaching rate of phosphorus is remarkably improved, the problems of low phosphorus leaching rate and high product impurity content in the prior art are effectively solved, no extra wastewater is generated in the whole technological process, the leaching agent and the crystallization mother liquor are in dynamic circulation in the whole production process, and the production cost is reduced. The method has the advantages that recycling of water resources and residual effective components is achieved, environmental protection and economic benefits are achieved, the problems that in the prior art, the technological process is complex, and cost is high are effectively solved, the industrial-grade hydrophosphate product meeting the industrial standard can be directly prepared from the battery powder lithium extraction slag, and the method is suitable for industrial production. And all-component high-value recovery of the waste lithium iron phosphate battery is realized.

The utility model relates to the technical field of diamond compact processing, and discloses a polycrystalline diamond compact leaching device which comprises a supporting plate, a leaching box is fixedly connected to the rear side of the top of the supporting plate, a stirring barrel is fixedly connected to the middle side of the top of the supporting plate, and a driving box is fixedly connected to the top of the stirring barrel. A driving assembly is arranged in the driving box, a stirring assembly and a cleaning assembly are arranged in the stirring barrel, the driving assembly comprises a motor, the motor is fixedly connected to the interior of the driving box, and the output end of the motor is fixedly connected with a driving bevel gear; and driven bevel gears are rotationally connected to the upper side and the lower side of the interior of the driving box. According to the leaching device, the driving assembly, the stirring assembly and the cleaning assembly are matched with one another, and the leaching liquid attached to the inner wall of the stirring barrel is scraped off while the leaching liquid is stirred, so that the leaching liquid is more sufficient, and the leaching effect is better.

The application discloses a method for extracting alumina from industrial solid waste red mud. The method comprises the following steps: mixing the red mud with a composite additive composed of sodium carbonate, potassium sulfate and limestone, wet ball milling the mixture until the particle size of the mixture reaches D90≤74 μm, drying the obtained slurry until the water content is less than 5%, and sintering at 950-1050 ℃ to obtain sintered clinker; leaching and separating the sintered clinker in hot water at a liquid-solid ratio of 10:1-25:1 and at 65-95 ℃ to obtain an aluminum-containing filtrate; introducing CO2 into the filtrate to perform carbonization, and performing aging and solid-liquid separation to obtain aluminum hydroxide; and then performing washing, drying and calcination to obtain an alumina product. By introducing potassium sulfate as a fluxing agent, the transformation of inert aluminum mineral phases is promoted, the sintering temperature can be reduced by 50-100 ℃, the time can be shortened by 30-50%, the process energy consumption is low, the aluminum extraction efficiency is as high as 88% or more, and a brand-new path is provided for large-scale resource utilization of the red mud.

The present application belongs to the field of mineral resources utilization, and particularly relates to a method for extracting potassium from potassium-rich slate, which comprises the following steps: subjecting the potassium-rich slate to low-temperature hydrothermal treatment at a temperature T1 to obtain leaching solution A and leaching residue A; in the low-temperature hydrothermal system, the Ca / Si weight ratio is controlled to be 2.2-3.0; the temperature T1 is 120-200 DEG C; subjecting the leaching residue A and an alkali activator to high-temperature hydrothermal treatment at a temperature T2 to obtain leaching solution B and leaching residue B; in the high-temperature hydrothermal system, the Ca / Si weight ratio is 2.2-3.0; the temperature T2 is 1.1-2 times the temperature T1. In view of the problem of difficulty in extracting potassium from potassium-rich slate, the present application proposes an innovative method: first, subjecting the raw material to low-temperature hydrothermal treatment to change its phase and microstructure, and then cooperating with the subsequent high-temperature hydrothermal process, the two synergistic effects can effectively destroy the crystal structure of the potassium-rich slate, thereby significantly improving the extraction efficiency and effect of potassium.

The invention discloses an ammonia leaching process of copper oxide ore, which comprises the following steps: crushing and grinding the copper oxide ore, adding an activating agent into the obtained ore pulp for activating treatment, sequentially adding ammonia liquor and sulfide for leaching treatment and precipitation reaction, and filtering, and copper sulfide concentrate and filtrate are obtained. Compared with a conventional ammonia leaching process, the ammonia leaching process of the copper oxide ore has the advantages that the copper oxide ore is sequentially subjected to crushing, ore grinding, activating treatment, leaching treatment and precipitation reaction, the copper leaching rate of the copper oxide ore can be remarkably increased, meanwhile, agent consumption and environmental pollution are reduced, and the ammonia leaching process is suitable for efficient recovery of complex and difficult-to-treat copper oxide ore; the method has the advantages of simplicity in operation, low cost, high leaching efficiency, good leaching effect, environmental friendliness and the like, and is high in use value and good in application prospect.

The utility model discloses a slurrying stirrer, the slurrying stirrer comprises a stirring main rod, a plurality of rotating blades and at least one vertical blade, the end part of the stirring main rod is provided with a connector, and the connector is used for being externally connected with a driving motor; the plurality of rotating blades are circumferentially arranged on the outer wall of the stirring main rod at intervals; the vertical blade is arranged on the side, facing the connector, of the rotating blade, and the end, deviating from the rotating blade, of the vertical blade is provided with an inclined face cutting edge. And at least one vertical blade is arranged on the rotating blade, and the design of the vertical blade can help to effectively cut and disperse copper telluride particles, so that the raw materials are more uniformly mixed in the stirring process, and the slurrying efficiency is improved. And the vertical blades are arranged on the sides, facing the connector, of the rotating blades, so that the speed of ascending flow can be increased, a strong vortex is formed, the copper telluride raw material can be better suspended in an alkaline solution, sedimentation and solid accumulation are avoided, and the leaching effect is improved.

The application relates to a method and device for leaching gallium and germanium from zinc leaching residue by using a strong magnetic field and composite ultrasonic waves, which comprises the following steps: S1, drying and grinding zinc powder replacement residue cakes to obtain zinc powder replacement residue powder; S2, mixing the zinc powder replacement residue powder obtained in the step S1 with low-concentration sulfuric acid, sealing, heating, inputting oxygen, stirring, ultrasonic treatment in a magnetic field environment, and filtering to obtain first-stage acid leaching residue and first-stage acid leaching solution; S3, mixing the first-stage acid leaching residue obtained in the step S2 with high-concentration sulfuric acid, sealing, heating, inputting oxygen, stirring, ultrasonic treatment in a magnetic field environment, and filtering to obtain second-stage acid leaching residue and second-stage acid leaching solution; and S4, drying the second-stage acid leaching residue obtained in the step S3 to obtain zinc powder replacement residue for leaching gallium and germanium. Compared with the prior art, the application combines oxygen pressure, ultrasonic waves, a magnetic field and stirring and other process conditions, so that more metal elements are exposed from the inside of the zinc powder replacement residue, and the leaching efficiency is improved.

The invention discloses a salicylic acid-based eutectic solvent, a preparation method thereof and a method for leaching valuable metals in a positive electrode material of a waste lithium cobalt oxide battery. The technical method is a salicylic acid-based eutectic solvent consisting of salicylic acid and a hydrogen bond acceptor, and the method for leaching the valuable metals in the waste lithium cobalt oxide battery positive electrode material by using the salicylic acid-based eutectic solvent comprises the following steps: (1) carrying out high-temperature treatment on the waste lithium cobalt oxide battery positive electrode material to obtain a pretreated material; mixing the pretreated material with a salicylic acid-based eutectic solvent, carrying out closed heating at 100-120 DEG C to react for 6-8 hours, and respectively recovering and leaching valuable metals and leachate in the positive electrode material of the waste lithium cobalt oxide battery; the salicylic acid-based eutectic solvent is low in price, wide in source and low in preparation cost, salicylic acid can be recycled, the recovery cost is reduced, the leaching method has the advantages of being good in environment, low in energy consumption, non-toxic, harmless, high in efficiency and the like, and a new thought is provided for the field of battery recovery; the method belongs to the field of battery recovery and eutectic solvents.

The invention discloses a method for recycling valuable metals Li, Ni, Co and Mn in a waste ternary lithium ion battery positive electrode material, which comprises the following steps: (1) obtaining the waste ternary lithium ion battery positive electrode material, roasting, then adding methanesulfonic acid and ascorbic acid for mixing reaction, and filtering; (2) adding dimethylglyoxime into the leachate to complex and precipitate Ni < 2 + >, and filtering to obtain filtrate 1 and filter residues; (3) adjusting the pH value of the filtrate 1, precipitating Co < 2 + > by adopting ammonium sulfide, and filtering to obtain filtrate 2 and filter residues; (4) adjusting the pH value of the filtrate 2, precipitating Mn < 2 + >, and filtering to obtain filtrate 3 and filter residues; and (5) adding phosphate into the filtrate 3 to precipitate Li < + >, and filtering to obtain filtrate 4 and filter residues. According to the method, a good leaching effect is achieved under the conditions that the acid concentration is low, the temperature is low, and the leaching reaction time is short, and the follow-up steps for separating and recycling the metal in the leaching liquid are short. The method is high in recovery efficiency, short in period, simple in process and suitable for industrial application production.

This invention relates to the field of mineral utilization, specifically to a method for bacterial leaching of high-fluorine-content uranium ore. The method involves crushing the high-fluorine-content uranium ore and packing it into columns or heaps to obtain a ore heap. The ore heap is then sprayed with an acidic solution. The collected leachate is subjected to uranium adsorption treatment, and the adsorption tailings are defluorinated and recycled back to the spraying process. Subsequently, bacteria are implanted into the ore heap. Then, a spray solution containing boric acid and other acids is used for bacterial leaching. The collected bacterial leachate is subjected to uranium adsorption treatment, and the adsorption tailings are recycled back to the bacterial leaching process. This invention can process uranium ore with a fluorine content of 5% or higher while still exhibiting excellent uranium leaching efficiency and effect.

The invention provides a waste lithium battery positive electrode material efficient leaching method based on electron beam rapid oxidation and application of the waste lithium battery positive electrode material efficient leaching method, and relates to the field of battery recycling. The leaching method comprises the following steps: S1, mixing black powder with water and carboxylate to prepare first slurry; and S2, carrying out electron beam irradiation treatment on the first slurry, introducing carbon dioxide, and carrying out solid-liquid separation to obtain a first lithium bicarbonate solution. Iron ions in lithium iron phosphate are rapidly oxidized by using an electron beam irradiation technology, and the use of hydrogen peroxide is reduced. Meanwhile, the effect of promoting lithium ion leaching can be achieved at normal temperature through electron beam irradiation, the requirement for the temperature in wet leaching is lowered, and therefore steam consumption is reduced.

The present application relates to a kind of resource utilization methods of lithium-containing waste, the resource utilization method includes the following steps: using hydrochloric acid to carry out acid leaching of lithium-containing waste, obtain acid leaching residue and acid leaching liquid;Using extractant extracts the obtained acid leaching liquid, obtain extract liquid and raffinate;The obtained raffinate carries out at least two times adjustment pH value, realizes the recovery of aluminum and nickel cobalt manganese element;The obtained extract liquid is back extracted, obtains lithium-rich liquid;Lithium-rich liquid is used for the preparation of lithium product after impurity removal.The resource utilization method provided by the present application can efficiently recover valuable metal elements in lithium-containing waste, avoid the generation of hazardous waste, and the acid leaching residue can be used as raw material for building materials and cement, which has high economic and environmental value;Furthermore, the use of specific extractant can also achieve efficient separation of Li and Al.

The invention relates to a method for intensifying vanadium extraction through roasting and acid leaching of vanadium shale. According to the scheme, the method comprises the following steps: crushing, roasting and grinding vanadium shale, and equally dividing to obtain n batches of roasted powder; adding water and concentrated sulfuric acid into the first batch of roasting powder, and then adding a first batch of leaching aid; and leaching, and carrying out solid-liquid separation to obtain a second batch of circulating leaching agent and a first batch of leaching liquid. A second batch of circulating leaching agent, concentrated sulfuric acid and water are added into the second batch of roasting powder to be mixed, and then a second batch of leaching assistant agent is added; and leaching, and carrying out solid-liquid separation to obtain a third batch of circulating leaching agent and a second batch of leaching liquid. ,...; the nth batch of circulating leaching agent and the (n-1) th batch of leaching agent are obtained, and n is a natural number ranging from 3 to 10. Mixing the n batches of lixiviates, adjusting the pH value, and adding sodium sulfite to obtain an extraction stock solution; and carrying out counter-current extraction and vanadium precipitation on the extraction stock solution to prepare vanadium pentoxide. The method is low in acid consumption, low in leaching aid consumption, high in vanadium leaching rate and good in vanadium and impurity separation effect.

The present invention provides a method for recycling lithium in waste lithium iron phosphate batteries by using a low eutectic solvent. The waste lithium iron phosphate batteries are completely discharged to obtain a battery positive electrode sheet, and the battery positive electrode sheet is heated under nitrogen to obtain lithium iron phosphate powder; a carboxylic acid compound containing both hydroxyl and carboxyl groups is used as a hydrogen bond donor, and an amino acid is used as a hydrogen bond acceptor, and mixed in deionized water to obtain a low eutectic solvent; the lithium iron phosphate powder is placed in the low eutectic solvent to leach lithium, and a lithium ion solution is obtained after solid-liquid separation, thereby completing the recovery of lithium in waste lithium iron phosphate batteries. The present invention utilizes the hydrogen bond network and strong electrostatic effect of carboxylic acid compounds containing hydroxyl and carboxyl groups and amino acids, and the two synergistically improve the acidity of the leaching environment, forming a low eutectic solvent with good fluidity, high lithium leaching rate, and short reaction time. The present invention realizes a green and non-toxic leaching process and maximizes the recovery value of waste lithium iron phosphate batteries, and has industrial application value.

This invention relates to a method and apparatus for ultrasonically enhanced leaching of gallium and germanium from zinc powder replacement slag. The method includes the following steps: S1, drying and grinding the zinc powder replacement slag block into zinc powder replacement slag powder, adding a low-concentration sulfuric acid solution, sealing, introducing oxygen, heating, stirring, ultrasonicating, and filtering to separate a first-stage acid leaching slag and a first-stage acid leaching solution; S2, mixing the first-stage acid leaching slag with a high-concentration sulfuric acid solution, sealing, introducing oxygen, heating, stirring, ultrasonicating, and filtering to separate a second-stage acid leaching slag and a second-stage acid leaching solution; S3, drying the second-stage acid leaching slag to obtain the zinc powder replacement slag from which gallium and germanium are leached. Compared with the prior art, this invention, by combining a series of process conditions such as oxygen pressure, ultrasonication, and stirring, greatly improves the leaching efficiency of gallium and germanium. It also has the advantages of simple equipment, convenient control, and low pollution, making it suitable for traditional continuous industrial production and providing valuable reference for the leaching of other elements.

The present invention discloses a method for recycling lithium from waste batteries, comprising the following steps: step S1: immersing electrode material slurry in an alkaline aldehyde solution, reacting for a period of time, and washing with water to obtain a valuable metal hydroxide precipitate and a lithium-containing solution by solid-liquid separation; step S2: adding sodium carbonate to the lithium-containing solution, and performing solid-liquid separation to obtain industrial-grade lithium carbonate; step S3: dissolving the valuable metal hydroxide precipitate with a sulfuric acid solution, and performing solid-liquid separation to obtain a solution containing nickel, cobalt, and manganese ions. Compared with the prior art that uses an acid leaching method, the present invention uses an alkaline leaching method, which has a good leaching effect and can produce a variety of valuable by-products. In particular, metallic copper will not dissolve under moderately alkaline conditions, and the copper element can be recovered, thereby increasing the value of direct valuable by-products.

The invention relates to the technical field of lithium ion battery recovery, in particular to an efficient impurity removal and recovery process for a lithium ion battery. Comprising the following steps: preparing an efficient leaching agent; performing grading treatment on the lithium battery; pretreating the negative pole piece; and recycling the pole piece material. By preparing the efficient leaching agent, lithium iron phosphate can be leached, graphite black powder is regenerated while metal ions are leached, Fe < 2 + > is oxidized into Fe < 3 + >, ferric hydroxide is precipitated when a sodium carbonate solution is added subsequently, and nickel cobalt manganese and lithium cobalt oxide positive electrode materials are leached through lactic acid in the efficient leaching agent; the technology is simple, multiple waste lithium battery components can be recycled at the same time, the recycling efficiency is high, the leaching effect of all the metal components is good, and the leaching rate is high.