908results about "Lithium carbonates/bicarbonates" patented technology

The invention provides a method and equipment for producing Li2CO3 based on coordinated roasting of lepidolite and spodumene. The method for producing Li2CO3 based on coordinated roasting of lepidolite and spodumene comprises the steps that S1, ore pretreatment is conducted, specifically, lepidolite and spodumene with the particle size smaller than 5 mm are evenly mixed according to the mass ratio of 1: (1-3), and the mixed ore is finely ground till the particle size is smaller than 75 microns; s2, additive mixing, wherein a composite additive is added into the mixed ore obtained after fine grinding and evenly mixed with the ore, and the composite additive is composed of fluoride, sulfate and a fluxing agent; and S3, coordinated roasting, wherein the mixed materials are fed into a rotary kiln to be roasted. According to the method for producing Li2CO3 based on coordinated roasting of the lepidolite and the spodumene, the lepidolite and the spodumene are roasted in a coordinated mode, the structural and chemical property differences of the lepidolite and the spodumene are utilized, advantage complementation is achieved, the overall extraction rate of lithium is increased, compared with a single lithium extraction technology, the lithium recovery rate can be increased by 10%-20%, and the waste residue generation amount is reduced.

The invention relates to the technical field of environmental protection, and discloses a method for degrading formamide organic wastewater and recycling key metals of a retired lithium ion battery. The method comprises the following steps: S1, obtaining the positive electrode material of the retired lithium ion battery, mixing the positive electrode material with formamide organic wastewater, and carrying out hydrothermal reaction to obtain a leachate; s2, adjusting the pH value of the leachate to 6-14, and carrying out a transition metal precipitation reaction to obtain a transition metal hydroxide precursor and a lithium-rich filtrate; and S3, adding a sodium carbonate solution into the lithium-rich filtrate, carrying out a precipitation reaction, and collecting lithium carbonate. The formamide organic wastewater serves as an endogenous reducing agent, deep degradation of the formamide organic wastewater is achieved under the hydrothermal condition, efficient leaching of key metal in the retired lithium ion battery is achieved, and waste is treated with waste; the formamide degradation efficiency can reach 90% or above, and the defects that an existing formamide wastewater treatment method is high in energy consumption, large in reagent consumption, high in cost, low in degradation efficiency and large in environmental treatment pressure are overcome.

The invention relates to a method for selectively leaching and regenerating a positive electrode material from a waste lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: discharging, disassembling, crushing, calcining and screening the waste lithium ion battery, adding an obtained positive active material into an oxalic acid solution, and stirring and reacting at 60-80 DEG C under the irradiation of an ultraviolet lamp to obtain a leaching solution rich in metal elements and leaching residue iron phosphate; adding sodium carbonate into the leachate for reaction to obtain lithium carbonate; and ball-milling and mixing iron phosphate, lithium carbonate and a carbon source, drying and calcining to obtain the regenerated lithium iron phosphate positive electrode material. The oxalic acid system is catalyzed by ultraviolet light to generate hydroxyl free radicals with strong oxidizing property, so that the leaching efficiency of lithium is remarkably improved, and the dissolution of iron is inhibited, thereby realizing the efficient separation of lithium and iron. The leaching residue is high-purity iron phosphate, lithium in the leaching solution is recycled in the form of lithium carbonate, and the leaching residue and the lithium carbonate can be directly used for regenerating the lithium iron phosphate positive electrode material as precursors, so that the technological process is greatly simplified, and the production cost is reduced.

The invention belongs to the technical field of lithium battery material recovery, and particularly relates to a method for recovering a waste lithium iron phosphate positive electrode material. The method comprises the following steps: (1) grinding and sieving the positive electrode material of the waste lithium iron phosphate battery, mixing with an alkaline solution, stirring and leaching, and carrying out solid-liquid separation to obtain a lithium-rich solution and leaching residues; (2) introducing a saturated sodium carbonate solution into the obtained lithium-rich solution, carrying out heating reaction, filtering, taking a solid phase, and drying to obtain lithium carbonate; and the obtained leaching residues are dried, and ferroferric oxide is obtained. According to the method, the waste lithium iron phosphate battery positive electrode material is leached through the alkaline liquid phase, it can be guaranteed that lithium and iron in waste lithium iron phosphate are separated through a one-step leaching method, and therefore selective lithium extraction is achieved. The whole technological process is convenient to operate, mild in reaction condition and low in energy consumption, does not need to use any acid or oxidant, avoids generation of a large amount of waste liquid and harmful gas, and is high in selective lithium extraction efficiency.

The invention discloses a treatment method of a lithium extraction leachate and a production method of lithium carbonate, wherein the treatment method can be used for efficiently recycling an aluminum resource in the leachate. The treatment method of the lithium extraction leachate comprises the following steps that 100, potassium sulfate is added into the lithium extraction leachate, and first liquid is obtained after the potassium sulfate is dissolved; step 200, performing freezing crystallization and solid-liquid separation treatment on the first liquid to obtain crude alum and lithium extraction mother liquor; step 300, dissolving crude alum in a solvent to obtain a second liquid; step 400, performing freezing crystallization and solid-liquid separation treatment on the second liquid to obtain high-purity alum and filtered mother liquor; wherein at least one of the lithium ion concentration, the rubidium ion concentration and the cesium ion concentration in the filtered mother liquor serves as a monitoring object to be monitored, when the monitoring object is larger than or equal to a threshold value, the filtered mother liquor and the lithium extraction mother liquor are mixed, and when the monitoring object is smaller than the threshold value, the filtered mother liquor serves as a solvent of crude alum.

The invention relates to a method for recovering lithium and fluorine from aluminum electrolysis hazardous waste, which comprises the following steps: firstly, mixing organic polyol and alkaline hydroxide according to a molar ratio of 1: (0.5-2) to obtain a eutectic solvent; heating the eutectic solvent to 80-150 DEG C, and adding a proper amount of raw material fine powder and calcium oxide for reaction leaching; carbonating and filtering the leachate to obtain lithium carbonate; washing the leaching residues with an acetic acid solution to obtain a calcium fluoride product; the concentration of fluorine ions in the leachate is smaller than or equal to 200 ppm, and the purity of calcium fluoride is larger than or equal to 90%; the leaching rate of lithium in the method is greater than 85%; the slag feeding rate of fluorine is greater than 95%; and no hydrogen fluoride gas is generated in the method. According to the method, a non-toxic and biodegradable eutectic solvent is adopted as a leaching agent, and efficient leaching of lithium and fluorine in the aluminum electrolysis dangerous waste materials is achieved; calcium oxide is used as a precipitating agent, free fluorine is promoted to be precipitated and recycled as calcium fluoride, the whole process meets the requirement of green metallurgy, and the win-win situation of resources and the environment is achieved.

The invention relates to the technical field of battery material recovery, and particularly discloses a method for efficiently recovering lithium and ferrous sulfate heptahydrate in retired lithium iron phosphate through total leaching and green impurity removal. Comprising the following steps: 1, adding strong base and a carbon source into black powder, and calcining at high temperature in an inert atmosphere; step 2, dissolving in pure water after calcining, and carrying out suction filtration to obtain a lithium salt solution and ferrous hydroxide; 3, sulfuric acid is added into ferrous hydroxide for suction filtration, and graphite and a ferric salt solution are obtained; drying the ferric salt solution to obtain ferrous sulfate heptahydrate; step 4, adding alkali into the lithium salt solution to obtain a purified lithium salt solution; 5, introducing carbon dioxide into the purified lithium salt solution, and adding alkali to generate lithium carbonate precipitate; and 6, finally carrying out heat preservation, suction filtration, washing and drying to obtain a lithium carbonate finished product. The technical problems that in the prior art, a traditional decommissioned lithium iron phosphate battery grading recycling technology is complex in production process, more waste liquid pollution is generated, and the production cost is relatively high are solved.

The invention provides a comprehensive utilization method of clay type lithium ore, and relates to the field of hydrometallurgy. The comprehensive utilization method of the clay type lithium ore comprises the following steps: mixing the clay type lithium ore with concentrated sulfuric acid, and carrying out low-temperature roasting at the temperature of 100-300 DEG C to obtain a roasted cured material; adding water into the roasted and cured material, leaching, and carrying out solid-liquid separation to obtain a lithium-rich aluminum leaching solution; adsorbing the lithium-rich aluminum leaching solution by using an aluminum ion sieve adsorbent to obtain an aluminum-rich adsorbed solution and a lithium-loaded ion sieve; analyzing the lithium-loaded ion sieve to obtain a lithium-rich desorption solution; the lithium-rich desorption solution is sequentially subjected to purification and lithium precipitation, and battery-grade lithium carbonate is obtained; sequentially carrying out iron removal, purification and impurity removal on the aluminum-rich adsorption post-liquid to obtain iron slag and an aluminum sulfate solution; and sequentially carrying out aluminum precipitation and roasting on the aluminum sulfate solution to obtain the metallurgical-grade aluminum oxide. The method has the advantages of high-efficiency leaching of lithium and aluminum, high-efficiency separation of lithium and aluminum, environment friendliness, simple process and the like.

In a method for regenerating a lithium precursor, an electrode active material mixture collected from a lithium secondary battery is prepared. The electrode active material mixture is reduced in a dry rotary heating reactor to form a preliminary precursor mixture. A lithium precursor is selectively recovered from the preliminary precursor mixture. Recovery yield and selectivity can be improved using the dry rotary heating reactor.

The invention discloses a method for separating and recycling phosphorus, iron and lithium in battery black powder, and relates to the technical field of battery recycling. The method comprises the following steps: carrying out acid leaching on battery black powder to obtain a battery black powder leaching solution and filter residues; an oxidizing agent is added into the battery black powder leaching solution, the pH of the solution is adjusted to 1.8-2.5, solid-liquid separation is conducted after the reaction is completed, and iron phosphate sediment and a lithium-containing solution are obtained; adjusting the pH value of the lithium-containing solution to 10-12, and carrying out solid-liquid separation after the reaction is completed to obtain a metal precipitate and a lithium sulfate solution; dissolving the iron phosphate precipitate in a sulfuric acid solution, adding a reducing agent to reduce ferric iron into ferrous iron, separating out ferrous sulfate by adopting an alcohol precipitation method or an ammonium sulfate crystallization method, and performing solid-liquid separation after the reaction is completed to obtain ferrous sulfate precipitate or ammonium ferrous sulfate crystals and mother liquor; and evaporating and concentrating the mother liquor, and extracting to obtain a phosphoric acid solution. According to the method, the three elements of phosphorus, iron and lithium in the battery black powder can be recycled, and the environmental problem caused by stacking of the lithium extraction slag can be avoided.

The invention discloses a method for separating and recycling phosphorus, iron and lithium in battery black powder, and relates to the technical field of battery recycling. The method comprises the following steps: mixing and leaching battery black powder and sulfuric acid, and filtering to obtain a leaching solution; the pH of the leachate is controlled, ferrous sulfate in the solution is separated out through alcohol substances or ammonium sulfate, and ferrous sulfate precipitates or ammonium ferrous sulfate crystals and mother liquor are obtained after filtration; evaporating and concentrating the mother liquor, adding an impurity removing agent into the mother liquor, and extracting to obtain a phosphoric acid solution and a lithium-containing solution; after phosphoric acid is supplemented into the lithium-containing solution, the pH is adjusted to be 8-10, and battery-grade lithium phosphate precipitates are obtained. According to the method, iron in the leachate is separated out firstly, and the subsequent impurity removal difficulty is greatly reduced, so that recycling of three elements including phosphorus, iron and lithium in the battery black powder is facilitated, and the environmental problem caused by stacking of lithium extraction residues can be avoided.

Low CAPEX / OPEX, effective, and environmentally friendly process of rapidly extracting lithium from geothermal brines and producing lithium carbonate. The method includes adjusting a unique parameter determined based on the modified alkalinity in a quantity of the geothermal brine to a preset value without needing to purposefully modify the pH. Interactions of the anionic reactant species with components within the geothermal brine cause a solid form of the lithium to precipitate out of the geothermal brine. After the solid separation, the spent brine is environmentally safe and returned underground or transported to a reservoir.

The present application relates to a kind of methods for recycling iron phosphate and lithium carbonate from waste, including iron phosphate, lithium carbonate and glucose in the waste, the method comprises the following steps: (1) waste is pickled to obtain iron phosphate crude material and lithium-containing solution;(2) lithium-containing solution obtained in step (1) is sequentially subjected to oxidative decomposition, neutralization precipitation, solid-liquid separation, enrichment concentration, impurity removal, lithium precipitation and post-treatment process, to obtain the lithium carbonate;(3) the iron phosphate crude material obtained in step (1) is washed with water to obtain the iron phosphate;Step (2) and step (3) are not in order of precedence.The method provided by the present application can effectively remove glucose and other impurities in the waste, achieve decolorization, and the obtained lithium carbonate can reach battery grade, realizing the recycling of iron phosphate and lithium carbonate in waste, improving the utilization value and economic benefits of waste in the production of lithium iron phosphate.

The invention discloses a method for extracting high-purity lithium carbonate from mixed lithium battery waste, and relates to the technical field of recycling of metal materials, and the method comprises the following steps: size mixing, dissolving and leaching, impurity removal of leachate, MVR concentration, lithium precipitation and secondary lithium precipitation. According to the method, the process is simple and energy-saving, roasting is not needed, additional energy consumption and harmful gas emission are avoided, the dissolving and leaching temperature is 50-60 DEG C, energy consumption is reduced, and the safety risk is lowered; the impurity removal only comprises three steps of alkalization, PAM flocculation and activated carbon adsorption, a reducing agent is not needed, and the impurity content is reduced to 5 mg / L or below; the lithium leaching efficiency is gt; by combining lithium precipitation optimization design and secondary lithium precipitation, the total recovery rate exceeds 90%, battery-grade lithium carbonate of which the yield is greater than or equal to 99.5% and industrial-grade lithium carbonate of which the yield is greater than or equal to 99.2% can be stably produced, and the quality standard is met; the MVR condensate water is fully recycled to realize zero discharge of wastewater and standard treatment of solid waste, and through DCS formula management, the mixed lithium battery waste can be flexibly treated, and the method is suitable for industrial continuous production.

The invention provides a method for recycling nickel, cobalt, manganese and lithium in a waste ternary lithium battery positive electrode material, and belongs to the technical field of waste lithium battery resource utilization. The method comprises the following steps: firstly, carrying out acid leaching treatment on the waste positive electrode material to transfer metal ions into a solution, and then co-extracting nickel, cobalt and manganese in the solution by adopting a co-extraction process while keeping lithium in a water phase. Compared with a traditional one-by-one separation and recovery mode, the method has the advantages that the separation process is remarkably simplified, the energy consumption and the operation difficulty are reduced, and the recovery efficiency and the product purity are improved. Through verification, the purities of lithium carbonate and nickel-cobalt-manganese products recovered by the process exceed 99.58%, the recovery rate of nickel-cobalt-manganese exceeds 95%, and the recovery rate of lithium exceeds 90%. The method not only has a good industrial application prospect, but also has important significance for promoting green recovery and resource cyclic utilization of the waste lithium battery.

The invention provides a method for preparing aluminum oxide and extracting lithium from lithium-rich bauxite waste rocks, and belongs to the technical field of solid waste comprehensive utilization. The method comprises the following steps: crushing and grinding the lithium-rich bauxite waste rocks, mixing with an acid mixed solution, leaching to remove iron to obtain a low-iron filter cake, adding concentrated sulfuric acid, roasting, curing, leaching with water, carrying out hot filtration to obtain a filtrate, adding a crystallizing agent, dissolving, evaporating to obtain a steel belt crystallizer crystal, stirring and washing a saturated solution to obtain a lithium-containing solution and low-iron aluminum ammonium sulfate, purifying the lithium-containing solution to remove impurities, and precipitating lithium with sodium carbonate to prepare lithium carbonate; and calcining the low-iron ammonium aluminum sulfate to prepare aluminum oxide. The method provided by the invention has the advantages of simple process, low energy consumption in roasting and leaching of aluminum and lithium, high recovery rate of valuable components of aluminum and lithium, high iron removal rate, high separation efficiency of aluminum and lithium, low extraction cost of aluminum and lithium, recyclability of the crystallizing agent and the like, is easy for industrial implementation, and greatly improves the comprehensive utilization value of the lithium-rich bauxite waste rocks.

The invention discloses a method for selectively recovering lithium from waste lithium iron phosphate batteries. The method comprises the following steps: carrying out ball milling activation on waste lithium iron phosphate powder and a grinding aid to obtain activated powder; and the activated powder is leached through an organic acid-hydrogen peroxide mixed leaching agent, slag and a lithium-containing solution are obtained, the lithium-containing solution is subjected to aftertreatment, and a lithium-containing compound is obtained through recycling. According to the method provided by the invention, through the synergistic cooperation of mechanical ball-milling activation and the specific organic acid-hydrogen peroxide system leaching agent, the use amount of leaching acid and the leaching temperature are reduced, the leaching rate and the recovery rate of lithium are improved, and meanwhile, the method is environment-friendly and is suitable for industrial production. And the resource recycling technology of the waste lithium iron phosphate battery is promoted to develop towards the green, efficient and economic direction.

The invention relates to the technical field of efficient lithium extraction of clay-type lithium ore and waste lithium iron phosphate, in particular to a method for collaborative roasting-selective lithium extraction of clay-type lithium ore and waste lithium iron phosphate, which comprises the following steps: respectively crushing and finely grinding clay-type lithium ore and waste lithium iron phosphate until-200 meshes account for 50-90%, dynamically proportioning and mixing to obtain a mixture with Li2O grade of 0.9-1.2%; and then carrying out mixed roasting, adding into a dilute sulphuric acid solution, and carrying out agitation leaching and filtering to obtain a lithium-containing leaching solution. According to the method, the thermodynamic complementation mechanism of the two materials is utilized, the roasting energy consumption is reduced, the double synergistic leaching mechanism is utilized, the leaching of lithium is enhanced, the content of impurities in the leaching solution is reduced, and the efficient selective leaching of the clay type lithium ore and the lithium in the waste lithium iron phosphate is realized.

The invention provides equipment and a process for recycling battery-grade lithium carbonate by roasting waste residues of an aluminum electrolysis cell with assistance of aluminum salt, and relates to the technical field of lithium carbonate preparation, the equipment comprises a reaction kettle body, a stirring mechanism, a driving mechanism and a medicament adding mechanism; the stirring mechanism comprises a stirring shaft which is vertically and rotatably connected to the interior of the reaction kettle body, and the stirring mechanism is used for mixing the sodium carbonate precipitant and the filtrate. According to the scheme, a stirring shaft finally drives a driving disc and a shifting plate to rotate anticlockwise, a rotating disc and a convex disc are driven to intermittently rotate clockwise under the cooperation of a driving block and a driven block, and the convex disc intermittently rotates to press a piston rod and a piston downwards through a contact piece, so that a sodium carbonate solution is conveyed to a water dropper through a liquid outlet hose; through intermittent rotation of the convex disc, the sodium carbonate solution is intermittently and slowly dropwise added into the filtrate, the lithium precipitation reaction concentration is accurately controlled, and the phenomenon that the added sodium carbonate solution has instantaneous extremely-high local supersaturation degree in the reaction kettle is avoided.

A low capital and environmentally friendly process of extracting lithium from natural brines. The method includes adjusting a unique parameter defined based on the modified alkalinity in a quantity of the natural brine to a preset value independent of the pH. Interactions of the anionic reactant species with lithium within the natural brine cause a solid form of the material that then precipitates out of the natural brine. After the solid separation, the spent brine may be returned to underground or transported to a reservoir.

A method of preparing a cathode active material composition involves combining a first cathode active material including recycled lithium 40 with a second cathode active material 41; wherein the ratio

A low capital and environmentally friendly process of extracting materials from slurries. The method includes adjusting a unique parameter determined based on the modified alkalinity in a quantity of the slurries to a preset value independent of the pH. Interactions of the anionic reactant species with lithium within the slurries causes a solid form of the material to precipitate out of the slurries. After the solid separation, the spent liquid may be returned to underground surface water systems or transported to a storage.

The invention provides a non-ferrous metal recovery method and an aluminum electrolyte carbon residue comprehensive utilization process, and relates to the technical field of metal recovery and utilization. A non-ferrous metal recycling method comprises the following steps that S1, pretreatment of raw materials is conducted, specifically, aluminum electrolyte is crushed and screened through a crusher to prepare carbon residue powder, the carbon residue powder and an alkaline compound are mixed according to the mass ratio and then put into a muffle furnace to be roasted, fluoride is converted into calcium fluoride, cyanide is converted into calcium cyanate, and roasted residues are generated; and S2, leaching treatment is conducted, specifically, the roasting slag in the step S1 is put into a constant-temperature water bath pot through a sulfuric acid solution to be leached. According to the scheme, enrichment of valuable metals such as aluminum and lithium can be finally achieved by leaching the roasting slag through sulfuric acid, impurities such as iron and aluminum are accurately separated from the leachate through a fractional precipitation method, calcium ions are selectively precipitated through oxalic acid, a high-purity lithium solution is finally obtained, a battery-grade lithium carbonate product is prepared after lithium precipitation, effective recovery and utilization of non-ferrous metals are achieved, and the method is suitable for industrial production. The energy is saved.

The invention discloses lithium orthosilicate, a preparation method and application thereof and a preparation method of lithium carbonate, and the preparation method of the lithium orthosilicate comprises the following steps: carrying out discharge treatment and pretreatment on a waste lithium battery to obtain waste positive electrode material powder; pressing the waste positive electrode material powder into a positive electrode material sheet; the positive electrode material sheet and a silicon dioxide sheet are stacked in an electric heating graphite boat, and the silicon dioxide sheet is located on the side, away from the electric heating graphite boat, of the positive electrode material sheet; the electric heating graphite boat is subjected to pulse heating treatment, the temperature of the pulse heating treatment ranges from 800 DEG C to 1000 DEG C, and the lithium orthosilicate is obtained. The transient high-temperature heating technology is adopted to excite gas-phase volatilization of lattice lithium in the waste lithium battery positive electrode material powder, and volatile lithium steam is directly used as a gas-phase reactant, so that gas-solid-phase rapid synthesis preparation of lithium orthosilicate is realized.

The utility model discloses a lithium carbonate lithium precipitation mother liquor recycling system which is characterized in that a lithium precipitation mother liquor pipeline is connected with a tube pass outlet of a freezing heat exchanger and a carbonization freezing crystallizer, and a circulating outlet of the carbonization freezing crystallizer is connected with a tube pass inlet of the freezing heat exchanger; a bottom crystal mush outlet is connected with the freezing thickening tank, a thickening bottom outlet is connected with the double-push centrifugal machine, and a solid phase outlet of the double-push centrifugal machine is connected with a salt outlet pipeline of the double-push centrifugal machine; the liquid phase outlet is connected with a freezing mother liquor tank; an outlet of the freezing mother liquor tank is connected with the pyrolysis crystallizer, a circulating outlet of the pyrolysis crystallizer is connected with a tube pass inlet of the forced evaporator, and a tube pass outlet of the forced evaporator is connected with a circulating inlet of the pyrolysis crystallizer; a bottom salt leg outlet of the pyrolysis crystallizer is connected with a scraper centrifuge; a solid phase outlet of the scraper centrifuge is connected with a salt outlet pipeline of the scraper centrifuge; a mother liquor outlet of the scraper centrifuge is connected with an inlet of the evaporation mother liquor tank. The system is good in safety, and the equipment and land occupation cost is reduced.

A method for removing calcium in a lithium battery recycling process includes recovering acidic lithium liquid including calcium; adding an oxalate aqueous solution to the acidic lithium liquid as a first calcium removal process; raising the pH of the acidic lithium liquid to prepare an alkaline lithium liquid; and adding ammonium oxalate to the alkaline lithium liquid as a second calcium removal process.

The invention discloses a method for preparing lithium iron manganese phosphate by obtaining a high-performance precursor from waste lithium iron phosphate. According to the method disclosed by the invention, the chelating effect of phytic acid and ferric ions is utilized, so that an organic carbon source is introduced into hydrated iron phosphate precipitated from the waste lithium iron phosphate leaching solution, the fusion growth of iron phosphate particles is effectively prevented in the subsequent high-temperature roasting process, and the high-performance lithium manganese iron phosphate precursor is obtained from the waste lithium iron phosphate. The method comprises the following steps: dissolving waste lithium iron phosphate powder in a sulfuric acid solution, then adding a small amount of a phytic acid solution and ferric sulfate with a corresponding molar weight, precipitating and calcining at a high temperature to obtain dehydrated iron phosphate (FP-PA) with a limited particle size; when the material is applied to synthesis of a lithium manganese iron phosphate positive electrode material, the particle size of the positive electrode material can be effectively controlled, and the specific capacity and cycle performance of a battery are improved. The method is easy to operate and high in repeatability, and a new way is provided for treating waste lithium iron phosphate with economic benefits and excellent performance.

The utility model discloses lithium carbonate refining and purifying equipment with a drying function, which comprises a purifying kettle, a top cover is clamped on the top surface of the purifying kettle, a servo motor A is fixedly mounted on the top surface of the top cover, and a mixing mechanism is fixedly arranged at the output end of the servo motor A; a filtering mechanism is connected to the bottom of the outer surface of the purification kettle in a penetrating mode, a water pump is arranged at one end of the filtering mechanism in a penetrating mode, a drying kettle is fixedly installed on one side of the water pump, and an electric heating plate is fixedly arranged in the cavity. According to the lithium carbonate refining and purifying equipment with the drying function, through the arrangement of the mixing mechanism, lithium carbonate preparation raw materials and an acid solvent are put into the purifying kettle, the raw materials in the purifying kettle are heated after an electric heating plate is electrified, an A servo motor drives an auger rod and a mixing rod to rotate, and the auger rod can accelerate exchange of the raw materials of the upper layer and the lower layer; the raw materials are further mixed by the mixing rod, so that the lithium carbonate reaction preparation efficiency is improved.

The application provides a lithium battery and a regeneration method of a positive electrode material thereof, a positive electrode sheet and a recycling system, and relates to the technical field of lithium batteries. The regeneration method comprises the following steps: obtaining recycled elements from a failed lithium iron phosphate positive electrode sheet, and preparing the recycled elements into recycled additives; obtaining ternary positive electrode active material powder from a failed ternary positive electrode sheet; mixing the recycled additives and the ternary positive electrode active material powder, and performing solid-phase sintering to obtain a closed-loop recycled positive electrode active material. The components in the waste lithium iron phosphate can be used as key additives for repairing and improving the performance of waste ternary materials, so that the high-value utilization of lithium iron phosphate is realized, and the ternary material is given deeper structural regeneration and performance upgrading. This not only solves the economic driving problem of lithium iron phosphate recycling, but also produces high-value-added ternary regenerated materials with superior performance, and finally builds a low-energy-consumption, low-emission and high-benefit collaborative recycling and closed-loop regeneration technology path.

The invention provides battery-grade lithium carbonate generation equipment and a brine multi-salt fractional crystallization and co-production process, and relates to the technical field of battery-grade lithium carbonate preparation, the battery-grade lithium carbonate generation equipment comprises a bottom plate, a treatment tank, a driving mechanism and a transmission mechanism; the treatment tank is mounted on the upper surface of the bottom plate, a first top cover is mounted at the top of the treatment tank, and a mounting cover is mounted at the top of the first top cover; and the driving mechanism comprises a mounting frame mounted on the upper surface of the first top cover. According to the scheme, when stirring enters a later stage, lithium-containing brine in a treatment tank is converted into lithium carbonate slurry, the diameter of the driving end and the diameter of the driven end of a steel belt are mutually converted, at the moment, stepless speed change can be achieved, and the diameter of the driving end of the steel belt is decreased; meanwhile, different stirring speeds can be freely matched according to different states of the lithium carbonate slurry, the stirring generation effect of the lithium carbonate slurry can be effectively improved, and it can be guaranteed that subsequent battery-grade lithium carbonate preparation is more stable.