106results about How to "Improve leaching rate" patented technology

The invention discloses a short-process preparation method and application of a vanadyl sulfate electrolyte based on vanadium slag valence regulation and control, and belongs to the technical field of vanadium electrolytes. The method comprises the following steps: leaching the vanadium slag by using sulfuric acid to obtain a leaching solution containing low-valence vanadium; extracting vanadium and chromium in the leachate by adopting an amine organic extraction agent; carrying out reverse extraction by using sulfuric acid; the method comprises the following steps of: firstly, extracting and separating vanadium by using a phosphoric acid extracting agent, and finally, carrying out reverse extraction by using sulfuric acid to obtain the vanadium electrolyte which can be used for constructing a VFB-5kW / 10kWh vanadium battery energy storage system. The traditional established thinking that pentavalent vanadium is extracted through vanadium slag oxidation to serve as a vanadium source to prepare the vanadium electrolyte is broken through, the novel technology for extracting the low-valence vanadium solution from the vanadium slag to directly prepare the vanadium electrolyte is provided, the short-process and green novel technology for preparing the vanadium electrolyte from the vanadium slag is constructed, the efficiency of the vanadium electrolyte preparation technology is improved, and the preparation cost is reduced.

The invention relates to a method for recycling iron phosphate from lithium iron phosphate waste and application of the method, and belongs to the technical field of iron phosphate recycling. Comprising the following steps that firstly, the lithium iron phosphate waste, a reducing agent and sodium carbonate are mixed and roasted at the temperature of 820-890 DEG C, the reducing agent reacts with oxygen in the lithium iron phosphate waste, and Fe (II) easier to leach by acid is generated; subsequently, the roasted product is immersed in a mixed acid and ferrite solution, Fe < 2 + > is dissolved in a solution system through the mixed acid, insoluble iron phosphate precipitates are promoted to be formed, and therefore the Li < + > leaching rate of insoluble phosphate minerals in the roasted product can be increased. According to the method, a mixed acid solution is added, the pH value in an acid leaching system is limited to be 1.0-5.0, so that impurity components containing copper, manganese, aluminum, nickel and the like in a roasted product can be dissolved in the mixed acid solution, finally, an iron phosphate-containing solid obtained after solid-liquid separation is calcined, and comprehensive utilization of recovering lithium and iron phosphate from the lithium iron phosphate waste at the same time is achieved.

The invention provides a method for deeply extracting vanadium from vanadium-containing steel slag, which comprises the following steps: mixing the vanadium-containing steel slag and an oxygen-containing microbubble ammonium bicarbonate solution, and carrying out mechanochemical ball milling activation to carry out leaching reaction to obtain a vanadium extracting solution. According to the method, advanced oxidation is cooperated with mechanochemical ball milling to activate and strengthen deep extraction of vanadium in the vanadium-containing steel slag, wrapping of substances such as calcium silicate and calcium titanium oxide on a vanadium-containing solid solution phase is destroyed through mechanical activation, and O2 microbubbles in an ammonium bicarbonate medium are promoted to generate active oxygen under excitation of mechanical activation energy; exposure reaction and deep oxidation extraction of a vanadium-containing phase under mild conditions are achieved, the content of V2O5 in tailings after vanadium extraction is smaller than or equal to 0.5%, and the vanadium extraction rate is 83% or above.

The invention provides a method for removing potassium and sodium in lithium slag. The method comprises the following steps: S1, providing the lithium slag; the lithium slag contains a potassium element and a sodium element; s2, grinding the lithium slag to obtain slag powder; s3, the slag powder and an alkaline leaching agent are mixed in water, and to-be-treated liquid is obtained; performing hydro-thermal treatment on the to-be-treated liquid to obtain reaction liquid; the alkaline leaching agent comprises Mg (OH) 2 and CaO, and the mass ratio of Mg (OH) 2 to CaO is 1: (3-8); the temperature of the hydrothermal treatment is 190-240 DEG C; and S4, carrying out solid-liquid separation on the reaction liquid to obtain tailings and a potassium-sodium separation liquid. According to the invention, the problem of removing potassium and sodium elements from the lithium slag can be fundamentally solved, and the potassium and sodium are prevented from damaging building materials along with the lithium slag.

This invention relates to a method for the combined leaching of high-silicon zinc roasted ore and high-sulfur zinc oxide powder, belonging to the field of hydrometallurgical technology. The high-sulfur zinc oxide powder is leached neutrally to obtain zinc oxide leaching residue and zinc powder leaching solution. The zinc powder leaching solution is then mixed with high-silicon zinc roasted ore slurry for controlled silica leaching of the high-silicon zinc roasted ore to obtain zinc ore leaching residue and zinc ore leaching solution. The zinc powder leaching residue and zinc ore leaching residue are mixed and then subjected to low-acid leaching to obtain low-leaching residue and low-leaching solution. The low-leaching residue is then subjected to hot acid leaching to obtain hot-leaching residue and hot-leaching solution. The hot-acid residue is then subjected to high-acid leaching to obtain lead-silver slag product and high-leaching solution. The hot-leaching solution is neutralized and reduced by high-sulfur zinc oxide powder to obtain neutralized solution and neutralized residue. The neutralized solution is then subjected to mineralization and iron precipitation to obtain hematite product and iron-removed solution. This invention can effectively control the leaching of silicon in the high-silicon zinc roasted ore leaching process, and simultaneously realize the oxidative leaching of sulfides in zinc oxide powder and the reductive leaching of zinc ferrite in zinc roasted ore, thus simplifying the leaching process of zinc roasted ore and zinc oxide powder.

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 provides a laterite-nickel ore gradient continuous leaching method which comprises the following steps: laterite-nickel ore sequentially passes through a fusion leaching area, a stable leaching area and an adjustable leaching area to be continuously leached in the material conveying direction of the laterite-nickel ore; acid liquor is added into the fusion leaching area and the stability leaching area; the temperature of the fusion leaching area is T1 and the reaction time is t1, the temperature of the stable leaching area is T2 and the reaction time is t2, and the temperature of the adjustable leaching area is T3 and the reaction time is t3; wherein T < 2 > < gt >; t3 > = T1, and t2gt; t3gt; t3gt; t1. According to the method, the high-pressure acid leaching process is subjected to partition treatment, the one-time leaching efficiency is improved, scaling is slowed down, accordingly, scaling of a reaction kettle can be reduced while further leaching of Fe and Al is inhibited, acid liquor and waste residues can be fully utilized, efficient leaching of nickel, cobalt and manganese is achieved, and waste heat generated after slurry is discharged from an adjustable leaching area can be recycled.

The invention discloses a method for treating copper cobalt oxide ore, and belongs to the technical field of non-ferrous metal hydrometallurgy. The method comprises the following steps: carrying out critical leaching on the copper-cobalt oxide ore to obtain a leaching solution and leaching residues, returning the leaching residues to a wastewater and waste residue neutralization process, carrying out a sulfuration sectional copper-cobalt deposition process on the leaching solution to obtain two products of copper sulfide and cobalt sulfide, carrying out targeted adsorption cobalt recovery on the produced sulfurized solution, returning the desorbed solution to a critical leaching process, and carrying out secondary leaching on the desorbed solution. After adsorption, liquid enters a waste water and waste residue neutralization process, produced neutralization residues are piled up, and produced neutralization water is returned to a critical leaching process. The method sequentially comprises the key procedures of critical leaching, vulcanization segmented copper and cobalt deposition, targeted adsorption and waste water and waste residue neutralization. The process adopted by the invention has the advantages of short process flow, high recovery rate, zero discharge of wastewater and the like. Compared with a traditional process, the copper and cobalt leaching rates can reach 90% or above, and the cobalt recovery rate can be increased by 10% or above.

The invention discloses a method for recovering scandium and titanium from Bayer process red mud. The method comprises the following steps: (1) drying the red mud; (2) mixing the dried red mud and phosphoric acid, performing acid leaching reaction, and then filtering and drying to obtain pretreated red mud; (3) carrying out acid leaching on the pretreated red mud by adopting a phosphoric acid-hydrogen peroxide system, and carrying out solid-liquid separation to obtain red mud leachate containing scandium and titanium and iron-rich leaching residues; (4) mixing the red mud lixivium containing scandium and titanium with a P204 extracting agent, stirring, oscillating and carrying out oil-water separation to obtain a scandium-loaded organic phase and a titanium-containing lixivium, and carrying out acid pickling on the organic phase for multiple times; and (5) adding ammonia water into the titanium leachate to adjust the pH value, heating and stirring, standing and precipitating to obtain amorphous titanium phosphate, and carrying out acid pickling after solid-liquid separation. According to the method, scandium and titanium in the red mud are separated and recycled in a two-stage acid leaching-extraction-precipitation combined mode. The selectivity of scandium and titanium is improved. And technical support is provided for recovery of scandium and titanium and comprehensive utilization of red mud.

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 discloses a preparation method and application of lignin, and relates to the technical field of preparation of natural organic compounds. The preparation method comprises the following steps: mixing a plant raw material containing lignin with a solution containing sulfurous acid and / or sulfite, reacting at the temperature of 100-180 DEG C under the pressure of 0.4-0.8 MPa, and performing solid-liquid separation to obtain lignin filtrate. The lignin and cellulose obtained through the preparation method are easy to separate, the lignin content in the lignin filtrate is high, the lignin filtrate is applied to zinc smelting oxygen pressure leaching, commercially available lignin can be completely replaced, the proportion of flotation tailings cannot be increased, sulfur recovery is more facilitated, and the TOC content and the chloride ion content of the oxygen pressure leaching liquid can be reduced.

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 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 invention discloses a method for producing lubricating products by utilizing tungsten and molybdenum resources, and relates to the technical field of utilization of tungsten and molybdenum resources, and comprises the following steps: adjusting the mass ratio of Mo and WO3 in tungsten and molybdenum resources to 10:2‑8, crushing, roasting, and obtaining roasting material; adding ammonia water to the roasting material for slurry adjustment, and oxygen pressure ammonia leaching; adding sulfuric acid to the leaching solution for acid precipitation to obtain a precipitate; introducing hydrogen sulfide gas to sulfide the precipitate to obtain a thioammonium salt; adding hydrochloric acid to the thioammonium salt for acidification reaction to obtain a trisulfide; calcining the trisulfide under a protective atmosphere; and crushing the calcined material to obtain. The invention utilizes a large amount of tungsten-molybdenum paragenetic ore or waste catalyst containing tungsten and molybdenum in nature, and obtains a mixture of tungsten disulfide and molybdenum disulfide through a hydrometallurgical process, which can be used as a solid lubricating material, effectively reducing the production cost of solid lubricating materials and improving the recovery of tungsten in ores, and reducing environmental pollution.

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 invention discloses a method for extracting lithium from coal ash through roasting pre-ultrasonic treatment assisted leaching. The method comprises the steps of ultrasonic pretreatment, alkali roasting activation, acid leaching or alkali leaching and the like. According to the invention, ultrasonic pretreatment is carried out before alkali roasting activation, that is, a mixture of fly ash and sodium carbonate is subjected to wet mixing and ultrasonic treatment after a small amount of water is added, so that the obvious effect of saving chemicals and energy is shown; therefore, a better activation effect and a better lithium element leaching rate can be obtained under the conditions of using fewer roasting additives and shorter roasting time, and circular economy and low-cost operation of extracting lithium from the fly ash are promoted. The research shows that the coal ash has very obvious potential as a feasible lithium source, and particularly, the ultrasonic pretreatment can play a very important role in optimization and expansion of industrial application of coal ash roasting leaching.

This invention discloses a method for preparing battery-grade nickel sulfate and iron phosphate using nickel pig iron and ferric phosphate slag as raw materials. The preparation process involves first mixing the ferric phosphate slag with cationic alkyl polyacrylamide to form a uniform mixture. This mixture is then added to dilute acid and stirred to disperse it. Nickel pig iron powder is added, and the mixture is filtered to obtain a leaching solution. The leaching solution is then subjected to nickel-iron separation using resin to obtain an iron-containing solution and a nickel-containing resin. The nickel-containing resin is desorbed to obtain a desorbed solution. A nickel-based pH adjuster is added to this desorbed solution, and the solution is filtered to obtain a nickel sulfate solution. After evaporation and concentration to precipitate crystals, the solution is dried and crushed to obtain battery-grade nickel sulfate. Hydrogen peroxide is added to the iron-containing solution to oxidize ferrous iron to ferric iron. A phosphorus source is added, the pH is adjusted, and the solution is reacted, filtered, and dried to obtain iron phosphate dihydrate. This is then calcined to obtain battery-grade iron phosphate. This invention uses nickel pig iron and ferrophosphate slag as raw materials, and utilizes the ferrophosphate slag to promote the full leaching of iron from nickel pig iron, and nickel pig iron to promote the leaching of phosphate and iron from ferrophosphate. With the addition of cationic alkyl polyacrylamide, it achieves high leaching rates of iron and nickel in a short time, and simultaneously achieves the separation of non-ferrous and nickel metal ions during the acid leaching process, so as to finally obtain high-purity, qualified battery-grade nickel sulfate and ferrophosphate.

This invention provides a method for complexing and leaching beryllium from lepidolite leaching residue. The lepidolite leaching residue is mixed with a sulfuric acid solution containing DTPA, and the pH is adjusted to 0.1-1.5, the DTPA concentration to 0.03-0.1 mol / L, and the solid-liquid ratio to 1g:8-15mL. The resulting slurry is ball-milled, and the exposed beryllium is in situ complexed by DTPA through mechanochemical processes to disrupt the mineral phase lock-in. After solid-liquid separation, a beryllium-containing filtrate and purified residue are obtained. This invention achieves a beryllium leaching rate of over 60%, effectively solving the problems of deep beryllium lock-in and deactivation of chelating agents under strong acid conditions. The process operates at room temperature and low energy consumption, showing promising prospects for industrial application.

The invention relates to a method for separating and recycling manganese and lead in electrolytic manganese anode slime, and belongs to the technical field of electrolytic manganese metal. Adding sulfuric acid and glucose into the electrolytic manganese anolyte, uniformly stirring, and heating to 90-95 DEG C to obtain an organic acid leaching solution; the electrolytic manganese anode slime is added into the organic acid leaching solution, leaching is conducted for 2 h at the temperature of 90-95 DEG C at the speed of 300 rpm, and then filtering is conducted to obtain a first-stage leaching solution; electrolytic manganese anode slime is added into the first-section leaching solution according to the liquid-solid ratio of 6.5-7: 1 m < 3 > / t, and a leaching solution and first-section leaching residues are obtained; adding the first-stage leaching residues into an organic acid leaching solution to obtain a second-stage leaching solution and leaching residues; activated carbon is added into a leaching solution obtained after first-stage leaching, stirring is conducted for 30 min at the normal temperature at the speed of 300 rpm, and residual organic matter in the leaching solution is adsorbed and removed; and leaching residues obtained after second-stage leaching are washed with water and dried, and lead concentrate with the lead grade ranging from 40 wt% to 50 wt% is obtained. The method has the advantages of low acid consumption, high manganese leaching rate, low treatment cost and the like.

The invention relates to a utilization method of low-grade easily dissolvable stone type niobium concentrate, and belongs to the field of mineral processing and hydrometallurgy. The method solves at least one of the problems of low recovery rate of Fe and Nb elements, complex process flow, high energy consumption and cost, harsh reaction conditions, high environmental pollution risk and the like in the utilization of the low-grade easily dissolvable stone type niobium concentrate in the prior art. The invention relates to a utilization method of low-grade easily dissolvable stone type niobium concentrate, which comprises the following steps: uniformly mixing niobium concentrate with a reducing agent, pelletizing, and reducing and roasting to obtain roasted ore; the roasted ore is smashed and then subjected to magnetic separation, and iron ore concentrate and tailings are obtained; acidizing and roasting to obtain re-roasted ore; circulating grass leaching to obtain grass leaching liquid and grass leaching residues; the grass extract is subjected to extraction and back extraction through extraction resin, and niobium-containing back extraction liquid is obtained. According to the method, the leaching rate of niobium and the recovery rate of the iron element are increased, the technological process is simplified, the energy consumption and the production cost are reduced, and green and environment-friendly production is achieved.

The invention provides a method for extracting indium from low-indium-containing secondary zinc oxide powder, and relates to the technical field of extracting indium from secondary zinc oxide powder. The method comprises four steps: step 1, pretreatment of the secondary zinc oxide powder; step 2, one-stage low-acid leaching treatment; step 3, two-stage high-acid leaching treatment; and step 4, mixed extraction. The invention provides a method for pretreating the low-indium-containing secondary zinc oxide powder on the basis of traditional two-stage acid leaching, and uses alkali washing and acid washing to remove pollutants and most of fluorine and chlorine on the surface of the low-indium-containing secondary zinc oxide powder to improve the efficiency of the subsequent leaching process. The method further uses microwave roasting treatment to promote the release of indium in the secondary zinc oxide powder and improve the subsequent leaching rate of indium. Furthermore, in the process of one-stage low-acid leaching, ultrasonic technology is introduced, and the cavitation effect of ultrasonic wave is used to destroy the adsorption layer on the surface of particles, increase the collision chance between particles, and thus improve the leaching rate of indium.

This utility model discloses an integrated treatment system for waste silicone catalysts, comprising a hydrolysis tank, a gas distributor at the bottom of the hydrolysis tank, a stirrer above the hydrolysis tank, and an exhaust pipe connected to the top of the hydrolysis tank. The outlet of a nitrogen pipeline is connected to the inlet of the gas distributor via a pipe; the outlet of a waste catalyst conveying pipeline is connected to the inlet of the hydrolysis tank; and the outlet of a dilute hydrochloric acid pipeline and the outlet of a water pipeline are both connected to the inlet of the hydrolysis tank. Beneficial effects: This utility model has a simple connection structure, is easy to implement, shortens the processing cycle, reduces material loss, and thus reduces equipment and labor costs; it also reduces safety hazards, improves copper leaching rate, can be directly adapted to the waste catalyst treatment needs of existing silicone monomer workshops, has low equipment modification difficulty, and is easy to promote.

The application discloses a method for obtaining high-grade tin concentrate from silver separation residue, and specifically comprises the following steps: uniformly mixing silver separation residue, an additive and carbon powder according to a proportion, preparing spherical material, and obtaining roasting residue through rotary kiln roasting; grinding the obtained roasting residue into powder, using a reducing agent solution to perform tin leaching on the powdered roasting residue, obtaining leaching liquid and leaching residue, and sending the leaching residue to other valuable element recovery; adding an oxidizing agent to the obtained leaching liquid, selectively precipitating tin in the solution, and obtaining tin precipitation residue and tin precipitation liquid. The high-grade tin concentrate can be obtained after the tin precipitation residue is dried and washed. The method directly obtains the tin concentrate from the silver separation residue, and has the advantages of high grade, few impurities, simple overall process operation, small reagent consumption in the tin precipitation process, low cost, short reaction time and no need of heating.

The invention discloses a cobalt vacancy regulation hollow multi-shell nickel-cobalt oxide catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: mixing glucose, zinc salt, cobalt salt, nickel salt and water, and carrying out hydrothermal reaction, calcination and etching to obtain the cobalt vacancy regulation hollow multi-shell nickel-cobalt oxide catalyst. According to the preparation method, zinc salt, cobalt salt, nickel salt and glucose are taken as raw materials, metal nickel, cobalt and zinc are crosslinked on polysaccharide through hydrothermal reaction to form a net-shaped structure, carbon and metal zinc on the surface are removed through calcination and etching, and the stable cobalt vacancy regulation hollow multi-shell nickel-cobalt oxide catalyst with the hollow multi-shell structure is formed. The preparation method disclosed by the invention has the advantages of simple process, safe raw materials, low cost, batch production and the like; the prepared cobalt vacancy regulation hollow multi-shell nickel cobalt oxide catalyst has the advantages of good catalytic activity, high degradation efficiency, good stability, strong anti-interference performance, low metal ion leaching rate and the like.

The invention relates to a process for efficiently recovering iron phosphate in a waste lithium battery, which comprises the steps of discharging, positive electrode material separation, heat treatment, acid leaching, electrolysis, dealumination, precipitation and the like, and realizes the efficient recovery and utilization of the waste lithium battery.

The invention provides a method for recovering lithium from waste lithium iron phosphate black powder, which comprises the following steps: S1, heating, stirring and mixing ethylene glycol and ferric chloride hexahydrate to obtain a eutectic solvent; s2, adding waste lithium iron phosphate black powder into the eutectic solvent, and reacting to obtain reaction slurry; and S3, carrying out solid-liquid separation on the reaction slurry to obtain a lithium-containing leachate. According to the method, the lithium in the waste lithium iron phosphate black powder can be selectively leached, and the leaching rate of the lithium can be increased.

The invention relates to a method for recovering nickel and cobalt from cobalt nickel hydroxide slag. The method comprises the following steps: mixing the cobalt nickel hydroxide slag with an ammonium solution, and carrying out ammonia leaching reaction to obtain an ammonia complexing solution; the ammonia complexing solution is sequentially subjected to oxidation decomplexing and a first sulfuration reaction, and a manganese and copper removal ammonia complexing solution is obtained; the manganese and copper removal ammonia complexing solution is subjected to a reduction reaction to obtain nickel-cobalt powder and a zinc ammonia complexing solution; the zinc-ammonia complexing solution is subjected to a second vulcanization reaction to obtain an ammonium solution, and the ammonium solution is recycled; according to the method, nickel and cobalt in cobalt nickel hydroxide are efficiently recycled, the purity of nickel and cobalt powder preferably reaches 99.5% or above, the recovery rate of nickel preferably reaches 94.2% or above, the recovery rate of cobalt preferably reaches 91.8% or above, and the method is simple in technological process, low in cost, environmentally friendly and good in industrial application prospect.

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 relates to the technical field of lithium dihydrogen phosphate preparation, and discloses a method for preparing lithium dihydrogen phosphate by recycling lithium batteries, which comprises the following steps: S1, crushing waste batteries; s2, screening and separating components with different particle sizes to obtain battery powder; s3, leaching is conducted, and a lithium-containing leaching solution is obtained; s4, adding an extracting agent to obtain high-purity lithium-containing filtrate; s5, obtaining phosphate for depositing lithium; s6, obtaining a lithium phosphate precipitate; and S7, obtaining a lithium dihydrogen phosphate solution. A small part of the lithium-containing leachate is treated with alkali liquor, metal impurities are removed, phosphate used for precipitating lithium is generated through phosphorus and lithium of the leachate, the prepared phosphate is mixed with the purified lithium-containing filtrate, lithium phosphate is directly precipitated, dependence on external raw materials and the production cost are reduced, and the method is suitable for industrial production. And lithium in the whole process is synchronously recovered through shunting treatment, so that lithium loss caused by shunting is avoided, and the overall recovery rate of lithium is improved.