138results about "Lithium carbonates/bicarbonates" patented technology

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 application provides a method for separating magnesium and lithium in brine, comprising the following steps: pretreating the brine to obtain pretreated brine; performing primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; the nanofiltration membrane selected for the primary nanofiltration is a carboxylated MOF modified nanofiltration membrane; and the raw materials for preparing the carboxylated modified nanofiltration membrane comprise a support, piperazine, carboxylated ZiF-8 and carboxylated Uio-66. The application reduces the risk of nanofiltration membrane pollution by pretreating the brine, pumps the pretreated brine into a nanofiltration system, generates a cut-off liquid rich in magnesium and sulfate ions and a high-lithium permeate liquid, performs secondary nanofiltration on the cut-off liquid to recover lithium, the secondary cut-off liquid can be used as a resource, the permeate liquid enters a reverse osmosis membrane, the lithium content is concentrated, the concentrated lithium liquid enters a lithium precipitation process, and the method for separating magnesium and lithium in the nanofiltration process realizes the impurity removal process for lithium recovery.

The present invention relates to a process for separating lithium ions and sodium ions from a sulfate-containing solution, and to an apparatus for carrying out the process.

This invention discloses a system and method for recovering lithium ions from lithium precipitation mother liquor. The system includes a primary nanofiltration unit, a secondary nanofiltration unit, a tertiary nanofiltration unit, and an extraction unit. The primary nanofiltration unit is used to nanofiltration the lithium precipitation mother liquor. The secondary inlet is connected to the outlet of the primary nanofiltration concentrate. The secondary nanofiltration unit is used to nanofiltration the primary nanofiltration concentrate. The tertiary inlet is connected to the outlets of the primary and secondary nanofiltration permeate. The tertiary nanofiltration unit is used to nanofiltration the primary and secondary nanofiltration permeate. The extraction unit is connected to the outlet of the tertiary nanofiltration permeate and is used to extract lithium ions from the tertiary nanofiltration permeate. This invention achieves the recovery of lithium ions from lithium precipitation mother liquor, avoiding the waste of lithium ions caused by directly discharging the mother liquor into salt fields. This is beneficial to the sustainable development and utilization of salt lake resources and can also reduce the production cost of lithium carbonate.

This invention relates to the field of high-purity material analysis technology, and discloses a method for simultaneously separating and enriching copper, cadmium, nickel, cobalt, zinc, lead, and barium in lithium carbonate. The steps are as follows: dissolving a lithium carbonate sample in nitric acid to obtain an acidified sample solution; adjusting the acidified sample solution to an alkaline pH range of 9.5-10.5 using an ammonia-ammonium acetate alkaline buffer solution; passing the alkaline solution through a solid-phase extraction column filled with iminodiacetic acid-type chelating resin, where copper, cadmium, nickel, cobalt, zinc, lead, and barium ions are selectively adsorbed onto the resin; and eluting the adsorbed heavy metal ions with acid to achieve separation and enrichment. This invention effectively overcomes the inhibition and interference of the lithium carbonate matrix on the detection of trace heavy metals, and in particular significantly improves the adsorption and recovery rate of elements such as barium. It achieves efficient separation and enrichment of multiple heavy metals in complex matrices, providing a reliable pretreatment solution for high-sensitivity and high-accuracy quality control analysis of lithium carbonate products.

The present invention relates to a method for extracting lithium from one or more lithium-containing batteries, the method comprising a dissolution step, the dissolution step comprising exposing a lithium-containing battery to an acidic leaching solution.

The application discloses a recycling process for battery graphite negative electrode and belongs to the field of battery recycling, which is used to solve the technical problem that the resource recovery rate of the battery graphite negative electrode in the prior art needs to be further improved, and specifically comprises the following steps: after pretreatment of a lithium battery negative electrode material, the lithium battery negative electrode material is immersed into an ammonium persulfate solution, filtered, (NH4)2C2O4, Ba(OH)2 and H2SO4 are added into the leaching solution, filtered, NH4HCO3 is added into the filtrate, vacuum filtered, lithium carbonate is obtained, graphite is oxidized, and then is compounded with a p-phenylenediamine composite material, calcined, and finally reduced oxidized graphite composite material is obtained. The application improves the purity of the graphite, the leaching rate of lithium, the recovery rate and the content of lithium carbonate through pretreatment of the negative electrode material, the ammonium persulfate solution and NH4HCO3.

The utility model relates to the related technical field of wastewater treatment, especially lithium carbonate production's wastewater treatment device, including processing box, sealing cover, baffle, adjusting pool and sedimentation tank, first feeding pipe, second feeding pipe, wastewater inlet pipe, conveying pipeline, stirring component, filter assembly, sludge pump, surplus material recovery unit and controller. Lithium carbonate production's wastewater treatment device of the utility model, the untreated wastewater first enters the adjusting pool, and here through the improvement water quality of putting in medicament, stirring and adjusting pH value, then through conveying pipeline and is transported to the sedimentation tank, adds coagulant and coagulation aid in the sedimentation tank and promotes suspended solid to deposit, finally separates out solid and liquid through filter assembly and sludge pump, realizes the efficient treatment of wastewater and the recovery of solid salt.

This invention belongs to the field of secondary battery cathode material recycling technology. More specifically, it relates to a plasma-sulfate combined method for recycling ternary battery cathode materials. The specific recycling method of this invention includes: immersing the cathode sheet in the solvent N-methylpyrrolidone, ultrasonically treating it to separate the active material layer on the cathode sheet surface from the current collector aluminum foil, sieving to remove the separated current collector aluminum foil, obtaining the cathode material; transferring the cathode material into a microwave reactor, heating it to 450-500℃ in a nitrogen atmosphere, holding the temperature for 10-20 minutes, cooling, and discharging to obtain pyrolysis material; transferring the pyrolysis material to a plasma chamber, using a reducing gas as plasma, and plasma treating it for 20-30 minutes under conditions of a gas pressure of 50-60 Pa and a radio frequency power of 480-550 W to obtain reduced material; using a compound acid leaching solution as the leaching solution, mixing it with the reduced material, and acid leaching for 45-80 minutes to obtain the leaching solution.

In the recovery method provided in this application, CO is generated by the reaction of oxalic acid and concentrated sulfuric acid. This provides an acidic atmosphere for the reaction between the cathode powder and CO, allowing some of the cathode powder (LiMeO2) to melt, transforming the solid-gas two-phase system into a solid-gas-liquid three-phase system, which is beneficial for improving the recovery rate of Li ions in LiMeO2. Furthermore, the use of CO for pre-lithiation results in a low lithium content in the solid filter material, minimizing interference from lithium ions in impurity removal and providing the possibility for subsequent efficient impurity removal. On the other hand, under acidic conditions, CO undergoes a reduction reaction with the cathode powder, reducing high-valence ions in the cathode powder to lower-valence ions, resulting in a more thorough reduction. This allows the solid filter material to dissolve in sulfuric acid, achieving efficient impurity removal. Additionally, Al is removed by adding alkali, oxidant, fluoride, and adsorbent. 3+ Fe 3+ Ca 2+ Mg 2+ F ‑ A second solution containing MeSO4 is obtained, which can be used as a precursor for preparing positive electrode active materials. It achieves efficient overall impurity removal and improves lithium recovery rate, while obtaining a high-purity MeSO4 solution.

A method for recovering lithium from waste according to the present invention comprises the steps of: preparing lithium carbonate; converting the lithium carbonate into slurry containing lithium hydroxide and calcium carbonate by using calcium hydroxide; performing solid-liquid separation of the slurry; first purifying the solid-liquid separated lithium hydroxide aqueous solution to obtain solid waste and a purified lithium hydroxide aqueous solution; second purifying the purified lithium hydroxide aqueous solution through an ion exchange resin; crystallizing the lithium hydroxide aqueous solution subjected to the second purification to obtain lithium hydroxide, wherein the second purification step utilizes an acid regeneration method to regenerate the ion exchange resin, thereby generating acid-regeneration wastewater and a lithium hydroxide purge solution is generated in the step of crystallizing the lithium hydroxide aqueous solution; carbonating the lithium hydroxide purge solution to obtain lithium carbonate and lithium carbonate purge wastewater; preparing a wastewater mixture by mixing the acid-regeneration wastewater, the lithium carbonate purge wastewater, and the solid waste; neutralizing the wastewater mixture; introducing a lithium adsorbent into the neutralized wastewater mixture to selectively adsorb lithium; desorbing the adsorbed lithium to obtain a desorption solution; carbonating the desorption solution to obtain lithium carbonate and a carbonated filtrate; and recycling the carbonated filtrate to the step of neutralizing the wastewater mixture.

Provided is a method for preparing lithium carbonate, comprising the steps of: removing sulfur from lithium-containing brine; removing magnesium and calcium from the lithium-containing brine; removing boron and calcium from the lithium-containing brine; removing sodium and potassium from the lithium-containing brine; and extracting lithium carbonate from the lithium-containing brine.

The present disclosure provides a method for selective leaching of lithium from lithium-ion battery waste, the method comprising providing water and / or an aqueous solution (10), providing solid lithium-ion battery waste material (12), adding the solid lithium-ion battery waste material to the water and / or to the aqueous solution to obtain a mixture (!4), and providing the mixture in a reactor, providing CO2 to the reactor, maintaining the pressure of the reactor containing CO2 at 50 bar or less, maintaining the temperature of the mixture in the range of 120-250°C, reacting for a time required to leach the lithium (16), and separating liquid comprising leached lithium (18) and / or delithiated solid material (20).

The application provides a method for selectively extracting lithium from salt lake brine and a membrane concentration system, and relates to the field of battery material preparation. The method for selectively extracting lithium from salt lake brine comprises the following steps: S1, filtering the salt lake brine to remove suspended solids, adjusting the pH of the filtered salt lake brine to 3-7.5, and then feeding the salt lake brine into an adsorption column system filled with a lithium selective adsorbent; S2, introducing a desorbent into the saturated adsorption column to desorb lithium, and collecting the desorption solution; S3, adjusting the pH of the desorption solution to 3.0-7.0, and then pumping the desorption solution into a membrane concentration system to obtain a lithium ion concentrated solution. The method for selectively extracting lithium from salt lake brine and the membrane concentration system provided by the application realize efficient separation of lithium from major ions such as magnesium, potassium and sodium in the adsorption unit, greatly reducing the subsequent burden; the electrodialysis unit removes boron impurities in a targeted manner, avoids the co-precipitation of boron in the lithium precipitation stage, and ensures that the product meets the battery grade standard.

A process (100) for treating aqueous impurity containing streams containing lithium cations and impurities within a lithium extraction process comprises: (a) contacting the impurity containing stream with a soluble phosphate to produce a precipitate containing lithium phosphate and a soluble impurity containing stream; and (b) treating the precipitate containing lithium phosphate with an aqueous reagent to produce the soluble phosphate for re-use in step (a) and a lithium salt recyclable to the lithium extraction process (100). Lithium recovery from the impurity containing stream may be 80% or greater.

The application discloses a kind of recycling methods of waste ternary positive electrode material, belong to lithium battery recycling technical field.The recycling method of waste ternary positive electrode material of the application, comprising the following steps: raw material pretreatment, solvothermal reaction, extraction separation, purification nickel-cobalt alloy, lithium recovery.The recycling method of the application, by the pretreatment under specific pH system, solvothermal reaction and purification process, can the nickel-cobalt element in ternary material be directly converted into nickel-cobalt alloy single element, greatly reduce process flow, reduce material input and energy consumption, realize the efficient recovery of nickel-cobalt alloy and lithium carbonate.In addition, the mild alkaline medium can also avoid the serious corrosion problem caused by strong acid system to equipment, effectively reduce the initial investment and subsequent maintenance cost of equipment, so that the method becomes green recycling method with environmental friendliness and economic competitiveness.

The application discloses a kind of for purification equipment of lithium carbonate, belong to lithium carbonate production equipment technical field.The application includes equipment ontology and installs double universal matrix cooling scale inhibition component in its outer wall;The component includes several bidirectional main unit, multidirectional hinged linkage, symmetrical double-pipe waterway communication piece, outer wall fixing piece and cooling water source component.Multidirectional hinged linkage is connected into flexible matrix band with multiple bidirectional main unit, can streamline type fit elbow, spherical head and other complex curved surface;Symmetrical double-pipe waterway communication piece can be detachably installed in waterway passage and is connected to form continuous waterway;Cooling water circulation flow realizes wall surface accurate cooling.The application is based on first principle, solves the fouling problem that scale inhibitor is ineffective due to local high temperature from source, realizes complex curved surface dead angle fitting, point contact accurate heat dissipation, liquid path is unobstructed and does not interfere with purification process, significantly reduces shutdown cleaning frequency.

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.

A method for recycling an anode material includes a step (a) of loading a heat treatment object including the anode material into a heat treatment furnace, a step (b) of raising an internal temperature of the heat treatment furnace to increase to a range of about 100° C. to about 400° C., a step (c) of heat-treating the heat treatment object at the increased temperature, and a step (d) of discharging first powder made after the heat treatment of the heat treatment object is completed. The first powder includes recycled anode powder selected from the group consisting of recycled carbon powder, silicon powder, silicon oxide powder, carbon-silicon composite material powder, or combinations thereof, and the heat treatment object includes at least a portion of a waste lithium-ion secondary battery or wastes generated during a process of manufacturing the lithium-ion secondary battery or a process of manufacturing the anode material.

The application provides a method for recycling lithium-containing wastewater, comprising the following steps: S1: mixing the lithium-containing wastewater with a sulfuric acid solution, adjusting the pH of the mixed solution to 4.0-5.0, then adding a first defluorination agent for defluorination treatment, performing solid-liquid separation after the reaction is completed, and obtaining a defluorination-after liquid and a defluorination-after defluorination agent; S2: regenerating the defluorination-after defluorination agent in step S1 by using an alkali solution, and obtaining a regenerated defluorination agent and a regeneration-after liquid after solid-liquid separation; S3: performing lithium precipitation treatment on the defluorination-after liquid in step S1, performing solid-liquid separation after the reaction is completed, and obtaining a lithium precipitation-after liquid and lithium carbonate; sequentially using a second defluorination agent and the lithium precipitation-after liquid to remove impurities from the regeneration-after liquid in step S2, and combining and treating the impurity-removed regeneration-after liquid and the defluorination-after liquid in step S1. The method can reduce the production of solid waste residues and the introduction of impurities in the treatment process of the lithium-containing wastewater, improve the lithium yield, and reduce the production cost.

This invention relates to the field of lithium extraction technology from lithium-containing organic wastewater, specifically to a method for preparing battery-grade lithium carbonate from lithium-containing organic wastewater. The method provided by this invention first recovers organic acids from the wastewater through esterification and hydrolysis reactions. Then, under pH 11-12 conditions, lithium is precipitated with trisodium phosphate to obtain crude lithium phosphate solid. The lithium is then enriched, dissolved in acid, and extracted to remove phosphoric acid. The raffinate is adjusted to pH 9-11 to remove impurities, yielding a lithium sulfate solution. After concentration using MVR (Medium-Volume Reduction), impurities are further removed under pH 10.5-11.5 and activated carbon adsorption conditions to obtain a pure lithium sulfate solution. The obtained pure lithium sulfate solution is mixed with a carbonate solution to obtain crude lithium carbonate. Finally, after washing, drying, crushing, and iron removal, battery-grade lithium carbonate is obtained.

The application discloses a method for extracting metal from waste lithium ion battery positive electrode material. It relates to the technical field of battery recycling. The method comprises the following five steps: (1) obtaining waste lithium ion battery positive electrode material; (2) mixing the waste lithium ion battery positive electrode material obtained in step (1) with an additive to obtain a mixture; (3) roasting the mixture obtained in step (2) to obtain a roasting product; (4) leaching the roasting product obtained in step (3) with deionized water; (5) after the process of step (4) is completed, filtering is performed to obtain a filtrate and a residue; wherein the filtrate is pyrolyzed, and the pyrolysis liquid is subjected to solid-liquid separation to obtain a lithium carbonate product; wherein the residue is leached with a mixed solution of sulfuric acid and oxalic acid, and the leaching liquid is purified and extracted to prepare nickel, cobalt and manganese products. The method has the advantages of easy operation, low roasting process temperature, low recovery cost and no secondary pollutants generated in the recovery process.

A system and process for direct lithium extraction from geothermal brines, and more particular to the sequential combination of a geothermal plant (200), a direct lithium extraction circuit (400), a lithium chloride concentration and purification circuit (600), and a lithium battery chemical processing circuit (800), for the production of lithium hydroxide monohydrate, lithium carbonate or both from geothermal brines. The processing circuits are powered by the electricity and heat produced by the geothermal plant without the use of carbon-based fuels. Non-condensable gases that may come out of solution from the geothermal brine are not emitted into the atmosphere.

The present invention is characterized in that: in order to regenerate an ion exchange resin, an acid regeneration method is utilized, and thus acid regeneration wastewater is generated therefrom; a lithium hydroxide purge solution is generated in a step of crystallizing a lithium hydroxide aqueous solution; and lithium carbonate and lithium carbonate purge wastewater are obtained through a step of carbonating the lithium hydroxide purge solution, wherein the present invention comprises the steps of: preparing a wastewater mixed solution by mixing acid regeneration wastewater and a lithium carbonate purge solution; neutralizing the wastewater mixed solution; concentrating and carbonating the neutralized wastewater mixed solution to obtain lithium carbonate and a carbonation filtrate; and recycling the carbonation filtrate in the step of neutralizing the wastewater mixed solution.

This invention relates to the field of waste lithium-ion battery material recycling technology, and particularly to a method for preparing single-crystal fluorine-doped ternary cathode material using battery black powder. The method includes: high-temperature calcination pretreatment of the black powder; sulfuric acid dissolution and leaching; removal of copper, aluminum, iron, calcium, and magnesium impurities; co-precipitation of nickel, cobalt, and manganese at pH 11.2-14, followed by conversion to oxalate using oxalic acid; lithium replenishment and in-situ fluorine doping during calcination using residual fluorine-containing substances in the black powder to obtain regenerated ternary cathode material; and finally, recovery of lithium carbonate from lithium-rich solution. This invention can efficiently recover Ni, Co, Mn, and Li, with an overall recovery rate exceeding 90%. It can also effectively remove impurities such as Cu, Al, Fe, Ca, and Mg, improving material purity. The single-crystal fluorine-doped regenerated ternary material exhibits good cycle stability and rate performance. This invention significantly improves the purity and electrochemical performance of the regenerated material through multi-stage deep impurity removal and in-situ fluorine doping technology. The process is simple, resource utilization is high, and it is suitable for industrial production.

According to one embodiment of the present invention, provided is a method for preparing a lithium compound, the method comprising: a step for adding sulfuric acid to a raw material containing lithium and magnesium to leach out lithium and thereby obtain a sulfuric acid leachate; and a step for heating the sulfuric acid leachate to precipitate magnesium sulfate and thereby remove magnesium.

The present application belongs to the technical field of lithium resource leaching, and relates to a method for preparing battery-grade lithium carbonate from low-grade lepidolite. The method comprises the following steps: raw material pretreatment, acid leaching reaction, membrane separation and purification, valuable metal separation and recovery, deep impurity removal and refinement, lithium precipitation and product forming. In the lithium extraction method, low-grade lepidolite, dilute hydrochloric acid and a catalyst are added into a specific plastic reaction kettle at a certain liquid-solid ratio for low-temperature and normal-pressure reaction, and then battery-grade lithium carbonate and other high-value-added products are obtained through subsequent solid-liquid separation, washing, membrane separation, byproduct separation and lithium precipitation processes. The method is energy-saving and environment-friendly, can improve the leaching rate of lithium and the comprehensive utilization rate of lepidolite, has high automation degree, low cost and is suitable for industrial production.

The present application relates to a method for recovering lithium carbonate from lithium precipitation mother liquor, which comprises the following steps: subjecting the lithium precipitation mother liquor to at least two stages of freezing crystallization treatment to obtain mirabilite and a frozen mother liquor, wherein the temperature of each stage of freezing crystallization treatment is ≤12℃, and the temperature of the next stage of freezing crystallization treatment is 6-12℃ lower than that of the previous stage; subjecting the frozen mother liquor to evaporation concentration to obtain crude lithium carbonate and a concentrated mother liquor; subjecting the crude lithium carbonate to carbonization treatment and pyrolysis treatment in sequence to obtain battery-grade lithium carbonate; and subjecting the concentrated mother liquor to lithium precipitation to obtain battery-grade lithium carbonate. The method for recovering lithium carbonate from lithium precipitation mother liquor is simple, low in energy consumption and operation cost, high in lithium recovery rate, and high in purity of the obtained lithium carbonate product, which meets the requirements of battery grade.

This invention discloses a method for extracting, washing, and back-extracting lithium from a lithium-containing multi-impurity solution to prepare battery-grade lithium carbonate, belonging to the field of chemical separation technology. The method involves using a special combination of extractants to sequentially remove divalent or higher-valent metal cation impurities from the lithium-containing multi-impurity solution and selectively extracting lithium. The resulting lithium-loaded organic phase is acid-washed to remove most sodium and potassium impurity ions. The washed lithium-loaded organic phase is then subjected to multi-stage countercurrent back-extraction under closed pressure using NH4HCO3 for oil removal, followed by thermal decomposition to obtain mother liquor, NH3, CO2, and battery-grade lithium carbonate. This method achieves highly efficient lithium extraction, improves lithium yield, enables direct preparation of battery-grade lithium carbonate, and enhances the purity of the lithium carbonate product.

Methods and systems for production of lithium hydroxide and lithium carbonate are described. One or more embodiments of the method include producing lithium hydroxide from potassium chloride, lithium chloride, and water. One or more embodiments of the method include producing lithium carbonate from potassium chloride, lithium chloride, water, and a carbon dioxide source. One or more embodiments of the method include producing lithium carbonate from sodium chloride, lithium chloride, water, and a carbon dioxide source.