48results about How to "Efficient leaching" patented technology

The invention provides a method for leaching copper-cobalt sulfide ore under efficient oxygen pressure, and relates to the technical field of metallurgy. The method for efficiently leaching the copper-cobalt sulfide ores under the oxygen pressure comprises the following steps: mixing materials including the copper-cobalt sulfide ores, sulfuric acid and water, slurrying, and then carrying out an oxygen pressure leaching reaction; and after the oxygen pressure leaching reaction is finished, solid-liquid separation is carried out, and leaching residues and leaching liquid are obtained. According to the method, the self-exothermic reaction of the excess sulfur element in the copper-cobalt sulfide ore is utilized, additional heating is not needed in the reaction process, then the oxygen pressure leaching reaction can be rapidly completed at a high temperature in a short time, and SO2 is not generated in the reaction process. The method for high-efficiency oxygen pressure leaching of the copper-cobalt sulfide ore has the advantages of being high in reaction speed, low in reaction energy consumption, easy to operate, environmentally friendly, easy to achieve industrial application and the like.

The invention provides a method for promoting low-temperature roasting of lepidolite hydrosulfate to extract lithium based on mechanical activation. The method comprises the following steps: S1, providing a mixture; the mixture comprises lepidolite and disulfate, and the mass percent of the disulfate and the lepidolite is 35-45%; s2, carrying out mechanical activation treatment on the mixture to obtain a precursor material; the mechanical activation treatment comprises the steps that the mixture is subjected to ball milling, the ball-to-material ratio adopted in the ball milling is (2-6): 1, the rotating speed of the ball milling is 500-800 rpm, and the ball milling time is 1.8-6 h; s3, roasting the precursor material to obtain a roasted clinker; the roasting temperature is 400 to 800 DEG C; and S4, the roasting clinker is sequentially subjected to water leaching and solid-liquid separation, and a lithium-containing leaching solution is obtained. According to the method, the lithium in the lepidolite can be efficiently leached under the conditions of low auxiliary material ratio, low roasting temperature and water leaching.

The invention discloses a method for efficiently leaching waste aluminum electrolyte and recovering fluorine, lithium, aluminum and sodium, belongs to the field of solid waste resource recovery, and solves the following problems of low aluminum and lithium leaching rate in an alkaline process and HF pollution in an acid process. The method comprises the following steps: crushing, grinding and screening waste aluminum electrolyte blocks to obtain waste aluminum electrolyte powder A; uniformly mixing the waste aluminum electrolyte powder A with a calcium-containing reaction auxiliary material to obtain a material B; adding the material B into an alkali solution, and carrying out a leaching reaction; separating the materials to obtain filter residues and filtrate; carrying out acid pickling purification and impurity removal on filter residues, and filtering; extracting the filtrate to obtain a loaded organic phase and raffinate; carrying out reverse extraction on the loaded organic phase; adding reaction auxiliary materials into the raffinate, uniformly stirring, reacting, standing, filtering and separating; continuously supplementing reaction auxiliary materials into the filtrate, uniformly stirring, standing, filtering and separating. According to the method, multiple components in the waste aluminum electrolyte can be efficiently recycled, and the comprehensive utilization rate is high.

The invention belongs to the technical field of solid waste resource utilization, and relates to a method and system for preparing vaterite type calcium carbonate from waste incineration fly ash. The method comprises the following steps: by taking ammonium chloride as a leaching agent, leaching the waste incineration fly ash in a leaching agent solution, and then carrying out solid-liquid separation to obtain a calcium solution; and carrying out carbonation reaction on the calcium solution, an alkaline compound, sodium dodecyl benzene sulfonate and carbon dioxide under the conditions that the pressure intensity is 0.5-0.7 MPa and the temperature is 25-180 DEG C for 60-90 minutes to obtain the calcium carbonate. According to the method, high-quality vaterite type calcium carbonate can be prepared at a high conversion rate, the risk of fly ash is reduced, and mineralization of carbon dioxide is realized, so that waste is treated by waste, and green production is realized.

The invention discloses a gold leaching process using a high-safety bromine-containing substance, and belongs to the technical field of gold extraction. According to the method, the dibromo dimethyl hydantoin and the calcium bromide are prepared into the leaching solution according to a certain proportion, efficient gold leaching is achieved by adjusting parameters such as the pH value and the leaching time under the condition of the metal ion catalyst, and the gold can be effectively adsorbed, analyzed and recycled through the leached pregnant solution. Meanwhile, bromine in the leachate is recycled through an electrochemical method, bromine is prevented from permeating into the environment, the dosage of chemicals is reduced, a complete gold leaching and chemical circulating system is constructed, the gold leaching efficiency is improved, the environmental risk is reduced, the technical applicability is expanded, and the defects that traditional liquid bromine gold leaching is large in toxicity, low in leaching rate and leaching efficiency and the like are overcome.

The invention relates to the technical field of catalyst recovery, and discloses a method for non-destructively recovering a waste catalyst carrier and noble metal. The present invention uses a noble metal leaching agent comprising an oxidizing agent, a ligand precursor, and water for recovering spent catalyst supports and noble metals. The method comprises the following steps: after roasting and reducing the waste catalyst, leaching the waste catalyst in the precious metal leaching agent, and carrying out first solid-liquid separation and washing to respectively obtain a waste catalyst carrier and precious metal. According to the method, a form of firstly reducing and then oxidizing is adopted, a compound leaching system is used for replacing a traditional leaching system based on hydrochloric acid, acid gas volatilization during leaching reaction is reduced, environmental pollution is reduced, and the operation environment is improved.

The invention discloses a method for mechanical activation and oxygen pressure alkaline leaching of semi-oxidized tungsten-molybdenum ore, which relates to the technical field of hydrometallurgy and comprises the following steps: (1) crushing, beneficiating and finely grinding the semi-oxidized tungsten-molybdenum ore to increase the specific surface area of the semi-oxidized tungsten-molybdenum ore; (2) lime and distilled water are added to adjust the concentration of ore pulp, the fine tungsten-molybdenum ore powder is pretreated, and meanwhile heating and preheating are conducted; and (3) vacuumizing the reaction kettle, introducing oxygen, and adjusting the oxygen pressure and the reaction temperature for leaching. According to the method, microcracks can be generated in the ore through mechanical activation, oxygen pressure leaching is accelerated, meanwhile, under the alkaline conditions of heating and pressurizing, tungsten-molybdenum-calcium ore and scheelite in the ore powder are transferred into a leaching solution, and the tungsten-molybdenum leaching rate is increased. Experimental results show that the tungsten and molybdenum leaching rate of the refractory semi-oxidized tungsten and molybdenum ore can be effectively improved by optimizing the grinding granularity, the oxygen pressure, the reaction temperature, the ore pulp concentration and the reagent adding amount at the same time, and efficient leaching of tungsten and molybdenum in the semi-oxidized tungsten and molybdenum ore is achieved.

The invention relates to a pressurized oxygen-enriched leaching method for a waste catalyst containing tungsten and molybdenum, and relates to the technical field of solid waste resource utilization, in particular to a pressurized oxygen-enriched leaching method for efficiently recovering tungsten and molybdenum from the waste catalyst containing tungsten and molybdenum, which comprises the following steps: firstly, removing organic matters and sulfides in the waste catalyst through anaerobic pyrolysis and oxidizing roasting steps; tungsten and molybdenum are oxidized into tungsten oxide and molybdenum oxide. Then, the treated catalyst is smashed and subjected to oxygen-enriched alkaline leaching in a high-pressure reaction kettle, a mixed solution of sodium carbonate and sodium hydroxide is selected as a leaching agent, and tungsten and molybdenum are converted into water-soluble sodium tungstate and sodium molybdate respectively under the conditions that the temperature is 150-200 DEG C and the oxygen pressure is 0.1-1.5 MPa, so that efficient leaching is achieved. By means of the method, the leaching rates of molybdenum and tungsten can reach 99% or above and 95% or above respectively, the recovery efficiency of valuable metal is remarkably improved, and the process is simple, environmentally friendly and suitable for large-scale industrial production.

The invention relates to the technical field of lithium battery recovery, in particular to a method for producing cobalt oxide by recovering waste lithium batteries and recycling mother liquor in the production process. Comprising the following steps of lithium cobalt oxide battery disassembly and pretreatment, valuable metal leaching, extraction separation, hydroxyl cobalt oxide production and mother liquor recycling treatment. Citric acid and hydrogen peroxide are used as valuable metal leaching agents, efficient leaching of valuable metal such as lithium and cobalt can be achieved, dependence on strong acid is reduced, and safety risks and environmental pollution in the recovery process are reduced. The cobalt sulfate solution obtained by recycling the waste lithium cobalt oxide batteries is used for producing and preparing the hydroxyl cobalt oxide, after the hydroxyl cobalt oxide is obtained, the residual mother liquor contains a sodium hydroxide component, the mother liquor is subjected to impurity removal treatment, the recyclable alkali liquor can be obtained, the recyclable alkali liquor can be used as saponification liquid alkali to be used in the extraction separation step, resource waste is reduced, and the resource utilization rate is increased. The resource recycling rate is improved.

The invention relates to a method for extracting iron by leaching zinc under oxygen pressure, which comprises the following steps: carrying out oxygen pressure leaching on zinc concentrate to be treated, and carrying out solid-liquid separation to obtain oxygen leaching residue and oxygen leaching liquid; after the oxygen leaching residues are subjected to hot acid leaching, solid-liquid separation is conducted, and hot acid residues and hot acid liquor rich in Fe < 3 + > are obtained; carrying out solid-liquid separation after neutralizing the hot acid liquid to obtain neutralized slag and neutralized liquid with the pH value of 2-4; returning the neutralized slag to the oxygen pressure leaching process in S1; carrying out reduction treatment on the neutralization solution by using a reducing agent, and carrying out solid-liquid separation to obtain a reduction solution and reduction slag; wherein the reducing agent is ZnS and / or zinc concentrate; after the reduction liquid is subjected to iron removal through a hematite method, solid-liquid separation is conducted, and iron removal liquid and iron slag are obtained; the reducing slag is returned to the S1 oxygen pressure leaching procedure; and returning the iron-removed liquid to the oxygen pressure leaching process in the step S1. By means of the method, loss of valuable elements such as zinc can be reduced while iron resource open circuit in the zinc oxygen pressure leaching system is achieved, and the Zn recovery rate can reach 98.9% or above.

The present invention discloses an electrolytic separation device for separating arsenic and gallium from gallium arsenide waste residue, comprising an electrolytic cell, wherein an anode plate, a cathode plate, a first diaphragm and a second diaphragm are arranged in the electrolytic cell, wherein the first diaphragm and the second diaphragm are arranged between the anode plate and the cathode plate; the anode plate, the cathode plate, the first diaphragm and the second diaphragm separate the electrolytic cell into an anode region, an arsenic removal region and a cathode region which are independent of each other, wherein the anode region is located between the anode plate and the first diaphragm, the arsenic removal region is located between the first diaphragm and the second diaphragm, and the cathode region is located between the second diaphragm and the cathode plate. The present invention also provides an electrolytic separation method for separating arsenic and gallium from gallium arsenide waste residue using the electrolytic separation device. The present invention adopts a combination of slurry electrolysis and cyclone electrowinning to achieve efficient leaching of gallium arsenide waste, avoids contamination of the cathode electrolyte, and the purity of the cathode product gallium is high, thereby achieving efficient separation of gallium and arsenic.

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 discloses an iron-carbon catalytic material based on coal gasification slag as well as a preparation method and application of the iron-carbon catalytic material, and belongs to the technical field of industrial solid waste recycling. The preparation method comprises the following steps: adding dried coal gasification slag into an oxalic acid solution for extraction to obtain a suspension A; adding a reducing agent into the suspension A, carrying out precipitation reaction, and then carrying out solid-liquid separation to obtain a solid B; and sintering the solid B to obtain the composite material. The invention further discloses the iron-carbon catalytic material based on the coal gasification slag prepared by the method and application of the iron-carbon catalytic material. According to the method, the industrial solid waste coal gasification slag is used as a carrier, endogenous iron in the coal gasification slag is converted by adopting an acid leaching-reduction precipitation-roasting method, the iron-supported catalytic material with a stable structure and excellent performance is obtained, the process is green, the cost is low, the organic wastewater treatment capacity is excellent, and the practical value is relatively good.

The invention provides a hydrometallurgy process for low-grade tantalum-niobium ore. The hydrometallurgy process comprises the following steps that the low-grade tantalum-niobium ore is crushed and ground into tantalum-niobium ore micro powder; adding sulfuric acid and ammonium fluoride into the tantalum-niobium ore micro powder to obtain a mixture system; carrying out pre-reaction on the mixture system in a stirring state; the temperature of the pre-reaction is 150-180 DEG C; after the pre-reaction, adding sec-octanol into a mixture system, and continuing the reaction in a stirring state; the continuous reaction temperature is 150-180 DEG C; and after the reaction continues, slag is separated out, and the ore pulp is extracted to obtain an extraction phase containing tantalum and niobium. According to the hydrometallurgy process for the low-grade tantalum-niobium ore, tantalum and niobium in the tantalum-niobium ore can be efficiently leached out under the condition that hydrofluoric acid is not used as a tantalum-niobium ore decomposition raw material, the defect that a large amount of hydrofluoric acid is used in a traditional process is fundamentally overcome, and the fluorine pollution problem caused by the large amount of hydrofluoric acid is solved.

This invention provides a method for preparing nano-calcium carbonate, comprising the following cyclical processes: (1) pretreatment of dry carbide slag raw materials; (2) leaching Ca from the dry carbide slag with ammonium chloride solution. 2+ And perform solid-liquid separation to obtain a high-purity calcium chloride solution and ammonia. (3) Use the ammonia in (2) to absorb low-concentration CO2 flue gas to obtain a mixed solution of ammonium carbonate and ammonium bicarbonate; (4) Mix the mixed solution of ammonium carbonate and ammonium bicarbonate obtained in (3) with the calcium chloride solution obtained in (2) to obtain calcium carbonate precipitate and ammonium chloride solution; (5) Use the ammonium chloride solution obtained in (4) to evaporate and concentrate, and return to step (2) to complete the entire cycle process. This method uses the escaped ammonia produced by the traditional ammonium chloride leaching CO2 to dry carbide slag to absorb flue gas to prepare ammonium carbonate and ammonium bicarbonate. It not only achieves efficient conversion of low-concentration flue gas CO2, significantly reduces conversion costs, and improves economic feasibility, but also uses the high-concentration ammonium carbonate of the conversion product to produce nano-CaCO3, which has significant environmental and economic benefits.

The invention belongs to the technical field of harmless treatment of hazardous waste residues and resource recovery of rare and noble metals, and particularly relates to a method for selectively recovering thallium from zinc-cadmium residues. The method comprises the following steps: 1) preparing zinc-cadmium slag and water into slurry according to a certain solid-to-liquid ratio, adding a sulfur-containing reducing agent and alkali, uniformly mixing, and heating to react for a certain time; (2) after the reaction is completed, solid-liquid separation is conducted, thallium-containing leaching liquid and treated tailings are obtained, and the tailings are zinc and cadmium residues and can be directly returned to the zinc and cadmium recycling procedure; and (3) zinc powder is added into the leachate for replacement, thallium is recycled from the leachate, then solid-liquid separation is conducted, thallium and zinc liquid are obtained through recycling, and the process can be returned to the zinc recycling procedure. On the basis of sulfur-containing reducing agent treatment, zinc powder replacement is combined, and monovalent thallium and trivalent thallium in the zinc-cadmium slag can be recovered together in the form of simple substances.

This invention relates to an ultrasonic field-enhanced gas-filled leaching tank, comprising a tank body, a stirring device, a gas filling device, and an ultrasonic generator. The tank body has a leaching chamber with an open upper end. The stirring head of the stirring device is located inside the leaching chamber. The gas filling device includes a gas filling pipe, with its inlet located outside the leaching chamber for connecting to an external gas supply device, and its outlet located inside the leaching chamber. The ultrasonic generator includes an ultrasonic probe, which is disposed inside the gas filling pipe to generate an ultrasonic field enhancement effect when gas is transported through the gas filling pipe. Compared with the prior art, the ultrasonic field-enhanced gas-filled leaching tank provided by this invention enhances the synergistic oxidation of oxidants and non-ferrous metals through ultrasound, achieving rapid and efficient leaching of non-ferrous metals. The advantage of this technology is that ultrasound can generate strong liquid flow shear force and microbubbles, increasing the contact area between the liquid and the metal surface, promoting the reaction between the oxidant and the non-ferrous metals, and improving leaching efficiency.

The invention provides a clay type lithium ore external field enhanced resource comprehensive utilization method, and relates to the field of hydrometallurgy. The method comprises the following steps: uniformly mixing clay type lithium ore with concentrated sulfuric acid, and carrying out low-temperature curing to obtain clinker; mixing the clinker with water, and then carrying out leaching reaction to obtain a lithium-rich aluminum leaching solution; carrying out evaporative crystallization on the lithium-rich aluminum leachate to obtain a mixed crystal of lithium sulfate and aluminum sulfate; performing high-temperature pyrolysis reaction on the mixed crystal to obtain an oxide; carrying out high-energy grinding and leaching on the oxide, and filtering to obtain a lithium-containing solution and crude aluminum oxide; and carrying out post-treatment on the lithium-containing solution to obtain the battery-grade lithium carbonate. According to the method, the technological process of the clay type lithium ore is optimized, synchronous leaching of valuable elements lithium and aluminum and efficient separation of the lithium element and the aluminum element are achieved, the problem that the cost is high when lithium is independently extracted is solved, cooperative utilization of clay type lithium ore resources is achieved, and the cost is reduced.

Relating to the technical field of solid waste resource utilization, the invention discloses a waste incineration fly ash cold bonding aggregate granulation device, which comprises a shell assembly, a center driving and liquid distribution system, a feeding and diversion system, a supergravity reaction rotor, an edge granulation mechanism, a bottom maintenance discharge system and a gas phase and sensing system. Fly ash materials are conveyed and smashed through the feeding and guiding system, then supergravity carbonization and chelating spraying treatment are carried out through the center driving and liquid distributing system, the supergravity reaction rotor and the gas phase system, after fly ash slurry is formed, extrusion compact forming is carried out through the edge granulation mechanism, and the fly ash slurry is obtained. And the formed cold bonding aggregate is cured by the bottom curing and discharging system and then is discharged from the star-shaped discharging valve. According to the method, efficient chemical reaction under a high gravity field and high-strength physical extrusion forming are organically combined, the problems that in the prior art, the carbonization rate is low, the aggregate strength is low and the leaching risk is high are solved, and the high-density and low-leaching fly ash based road aggregate is continuously prepared through a one-step method.

The invention discloses a comprehensive extraction method for complex uranium-molybdenum ore. The method comprises the following steps: crushing the complex uranium-molybdenum ore, mixing the ore with an oxidant, an activator and water, and subjecting the ore to ball milling. The ball milled material is slurried and then heated and stirred for leaching. The leached slurry is flocculated and precipitated to obtain a uranium-molybdenum leaching solution. Uranium and molybdenum are separated from the uranium-molybdenum leaching solution through extraction. The method can improve the comprehensive recovery rate of uranium and molybdenum. The entire process is operated at normal pressure and low temperature, is environmentally friendly, is easy to operate, and is conducive to industrial promotion.

The application discloses a centrifugal extraction method of noble metals in waste circuit boards, and relates to the technical field of metal resource recovery.The application modifies pretreated inorganic porous materials by using a silane coupling agent containing a mercapto group to obtain modified inorganic porous materials, and then the modified inorganic porous materials are put into waste circuit board leaching liquor to produce adsorption and coordination combination with noble metal ions in the waste circuit board leaching liquor, and then the noble metals are efficiently recovered through centrifugation and extraction and the like.The method is simple, efficient, energy-saving and environment-friendly, and can realize resourceization and harmless treatment of waste circuit boards.

The invention discloses a deep-eutectic solvent, preparation thereof and application of the deep-eutectic solvent in recovery of a waste ternary lithium battery positive electrode material. The eutectic solvent is composed of ethylene glycol and lactic acid, and the molar ratio of ethylene glycol to lactic acid is 1: 10-10: 1. According to the method, a new eutectic solvent system is creatively constructed, selective leaching of the lithium element in the positive electrode material of the waste ternary lithium battery can be achieved, the coprecipitation process of key metal precursors such as nickel, cobalt and manganese is synchronously promoted, high-valued circulation and utilization of the waste ternary lithium battery are promoted, and the method is suitable for industrial production. The complex process of traditional multi-metal step-by-step separation is avoided, and the operation steps are simplified. In addition, the eutectic solvent can be recycled for more than five times, so that the battery recycling cost is reduced. The recycling method provided by the invention also greatly widens the separation and recycling ways of valuable metals in the waste batteries, and shows wide application potential and important value in the field of resource recycling.

The invention provides a treatment method for obtaining a solution containing nickel and / or cobalt from waste batteries. The treatment method sequentially comprises the following steps: (1) a pretreatment procedure: harmlessly treating and crushing the waste battery to obtain a crushed material; (2) an alkali leaching step in which an alkali is added to the crushed material to obtain an alkali leachate containing Li, Al, F, and P and an alkali leach residue containing Ni and / or Co; (3) a reduction leaching step in which the alkali leach residue is brought into contact with an acid and a reducing agent to obtain a reduction leachate in which Ni and / or Co are reduced and leached into an acid solution; (4) a vulcanization process: adding a vulcanizing agent into the reduction leachate to obtain a post-vulcanization liquid in which Cu is removed as sulfide; (5) an oxidation-neutralization step in which an oxidizing agent and a neutralizing agent are added to the post-vulcanization liquid to precipitate and remove Fe, P, and Al, thereby obtaining an oxidation-neutralized liquid; and (6) an ion exchange step in which the oxidized and neutralized solution is brought into contact with an ion exchange resin, and F is adsorbed to the ion exchange resin and separated, thereby obtaining a post-ion-exchange solution containing Ni and / or Co.

The invention discloses a normal-pressure alkaline leaching method for molybdenum calcine, and belongs to the technical field of non-ferrous metal metallurgy. According to the scheme, sodium hydroxide is adopted as an alkaline leaching agent, the dosage of the alkaline leaching agent is 1.1 times of the theoretical amount of formed molybdate, the alkaline leaching agent is added to carry out alkaline leaching on molybdate under the normal pressure, solid-liquid separation is carried out after the first-time alkaline leaching is completed, and the molybdenum calcine is obtained; the method comprises the following steps: extracting molybdenum from a raw material, performing secondary alkaline leaching on a slag phase, performing oxygen blasting to oxidize low-valence molybdenum insoluble in alkali into high-valence molybdenum easy to leach, and recycling leaching water used in the secondary alkaline leaching, so that the smelting process is greatly shortened, the processing cost is reduced, and the leaching extraction rate of molybdenum in the raw material reaches 98% or above through two times of alkaline leaching; meanwhile, compared with a traditional process, no liquid or solid oxidizing agent is added, it is guaranteed that no new impurity element is introduced, equipment used in the scheme is simple, cost is reduced, and the recovery rate of molybdenum is increased.

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 method for in-situ repair of a lithium ion battery negative electrode material, and relates to the technical field of lithium ion battery negative electrode material repair, and the method specifically comprises the following steps: S1, carrying out inactivation treatment on a lithium ion battery; and S2, disassembling the lithium ion battery, and sorting out a waste graphite negative electrode material from the disassembled and crushed waste lithium battery electrode material. According to the method for in-situ remediation of the lithium ion battery negative electrode material, obtained waste graphite is purified by adopting a sulfuric acid curing-acid leaching method, so that metals and oxides in the waste graphite can be converted into corresponding soluble sulfates, and the soluble sulfates are leached by sulfuric acid and enter a solution, so that the purification of the graphite is realized; compared with a traditional direct acid leaching mode, the sulfuric acid curing acid leaching technology can promote conversion of oxides and metal elements into sulfate, so that the oxides and the metal elements are leached more efficiently and finally converted into soluble sulfate in an acid environment, the impurity removal effect is effectively improved, and meanwhile generation of solid waste is reduced.

This invention provides a method for recovering valuable metals from spent lithium-ion batteries. The method utilizes a eutectic solvent composed of dimethyl-β-propionate thiophene as a hydrogen bond acceptor and lactic acid as a hydrogen bond donor, with the addition of ethanol, to separate valuable metals from spent lithium-ion batteries. Ultimately, lithium is recovered as lithium carbonate, manganese as hydroxide, and nickel and cobalt as metal oxides, achieving high separation efficiency. This invention employs a eutectic solvent to selectively separate multiple valuable elements from the cathode material of spent lithium-ion batteries, significantly shortening the reaction time. The selective recovery rate of transition metal elements can reach over 90%, and the lithium recovery rate can reach over 99%.

The application discloses a kind of waste lithium ion battery powder leaching methods, it is related to battery recycling technical field.Adopting ferrous sulfate as leaching agent can leach the main metal and impurity except copper in battery powder under mild conditions;Utilize nickel-cobalt slag to reduce ferric iron, while improving the main metal concentration in feed liquid without introducing new impurities;Aluminum is removed by bicarbonate to obtain aluminum slag, there is still a small amount of ferric ion in the process of removing aluminum, under the synergistic effect of a small amount of ferric ion, the aluminum slag obtained in the aluminum removal process is regular round, the aluminum content in the slag is high, the slag amount is small, the solid-liquid separation speed is fast, and the metal loss rate is low;After positive electrode powder is oxidized by ferrous ion, iron is removed to obtain purified liquid.The process of the application is simple, low in cost and highly practical, and can efficiently leach valuable metals under mild leaching conditions, and the leaching agent can be recycled.

The present invention discloses a comprehensive dealkalization method for vanadium-extracting waste slag, which comprises mixing the vanadium-extracting waste slag with a calcium additive, a carbonaceous reducing agent and sodium nitrite to form a ball, adopting a roasting process to decompose the sodium-containing solid solution in the vanadium-extracting waste slag, and leaching the sodium-containing phase in the waste slag through a hydrothermal leaching process to achieve the purpose of dealkalization. The leached slag is dried to obtain a sodium-free iron-containing material, which is recycled for use in the ironmaking process, and the leaching liquid is subjected to multi-effect evaporation to form a sodium-containing product, which can be directly exported. The process equipment of the present invention is simple and easy to operate, and the vanadium-extracting waste slag can be recycled within the steel enterprise. At the same time, the process has high energy utilization, less environmental pollution, and low operation and maintenance costs, and can realize large-scale recycling of vanadium-extracting waste slag, with good economic and social benefits.

This invention discloses an enhanced leaching and purification method for tellurium in arsenic-antimony-tellurium alkaline slag, belonging to the field of solid waste resource utilization and rare and dispersed metal extraction in non-ferrous metal smelting. Using high-arsenic-antimony-tellurium alkaline slag as raw material, a mixed leaching method with tellurium-directed leaching agents is employed. Through the synergistic effect of "strong alkali complexation-reduction solubilization-high salt stable solubility," efficient tellurium leaching and directional retention of arsenic and antimony are achieved, resulting in a low-impurity tellurium-containing solution after solid-liquid separation. After pH adjustment, a one-step tellurium purification agent is added for reduction purification, directly preparing high-grade elemental tellurium. This invention overcomes the limitations of traditional step-by-step processes, with high tellurium recovery as the core technical objective, achieving efficient separation and one-step purification of tellurium from arsenic and antimony: tellurium leaching rate ≥95%, reduction purification rate ≥98%, total recovery rate ≥93%, product grade ≥99.5%; arsenic and antimony leaching rates ≤3.5% and ≤5.0%, respectively. The leaching residue and purified liquid can be recycled. The process is short, the reagent consumption is low, it is compatible with conventional equipment, and it is suitable for industrial promotion.