420 results about "Lithium hydroxide" patented technology

The invention relates to a method for simultaneously preparing lithium hydroxide and sulfuric acid. The invention provides a method for simultaneously preparing lithium hydroxide and sulfuric acid, which comprises the following steps: preparing a bipolar membrane electrodialysis device which comprises a first bipolar membrane, an anion exchange membrane, a cation exchange membrane and a second bipolar membrane, and forming an acid chamber between the first bipolar membrane and the anion exchange membrane, a salt chamber is formed between the anion exchange membrane and the cation exchange membrane, and an alkali chamber is formed between the cation exchange membrane and the second bipolar membrane; a lithium sulfate aqueous solution is added into a salt chamber of the bipolar membrane electrodialysis device, a sulfuric acid aqueous solution is added into an acid chamber, and a lithium hydroxide aqueous solution is added into an alkali chamber; and discharging the desalted solution formed in the salt chamber of the bipolar membrane electrodialysis device, discharging the sulfuric acid aqueous solution formed in the acid chamber, and discharging the lithium hydroxide aqueous solution formed in the alkali chamber.

The present invention relates to a method for preparing lithium sulfide, according to the present invention, when preparing lithium sulfide by a reaction between a lithium raw material and hydrogen sulfide, the reaction is carried out under relatively mild conditions compared to the prior art, so that frequent maintenance or replacement due to corrosion and failure of a reactor and various pipes is not required, thereby improving the economical efficiency of the process. Further, by reusing the unreacted hydrogen sulfide from which moisture has been removed and the solvent, process costs can be reduced, and economical efficiency can be ensured during mass production. Furthermore, moisture and water vapor generated in the lithium sulfide generation reaction are effectively removed, thereby preventing a reverse reaction for generating lithium hydroxide, promoting a positive reaction, and producing high-quality lithium sulfide with high purity and high yield. In addition, the particle size can be adjusted in units, and a separate pulverizing space or pulverizing table is not required, so that convenience and mass productivity are excellent.

The invention discloses a method for in-situ lossless repair of an attenuated lithium manganate positive electrode material, which specifically comprises the following steps: adding the attenuated lithium manganate material into a lithium hydroxide solution, supplementing lithium to an original value by a hydrothermal method, repairing the component and structure defects of attenuated LiMn2O4 by combining high-temperature roasting, and recycling and regenerating lithium manganate particles with severely attenuated capacity. The lithium manganate positive electrode material is directly recovered by the lossless method, and the chemical components and crystallinity of the invalid positive electrode material in various health states are reconstructed, so that the invalid positive electrode material can be repeatedly used in the lithium ion battery. Finally, the treated recycled powder material is coated by a metal organic framework (MOFs) self-assembly method, so that the electrochemical performance of the treated powder material is further improved. The method is simple, environmentally friendly and low in energy consumption, has obvious advantages compared with a traditional hydrometallurgy battery recovery method, and lays an important foundation for sustainable manufacturing of energy materials.

The invention discloses a lubricating grease composition I and a lubricating grease composition II, wherein the lubricating grease composition I is used as a raw material of the lubricating grease composition II. The lubricating grease composition I comprises 60-90 parts of base oil, 5-20 parts of a fatty acid composition, 2-5 parts of lithium hydroxide, 2-6 parts of modified nano boron nitride and 5-15 parts of an additive; wherein the viscosity of the base oil at 40 DEG C is 30-60 mm < 2 > / s, and the base oil is prepared by compounding and mixing 60%-90% w / w of poly-alpha-olefin synthetic oil (PAO) and the balance of synthetic ester (POE) belonging to V-type synthetic oil; the fatty acid composition is prepared from 12-hydroxystearic acid and unsubstituted C14-C20 saturated long-chain fatty acid, wherein the mass of the 12-hydroxystearic acid is 1 to 10 times that of the unsubstituted C14-C20 saturated long-chain fatty acid; the modified nano boron nitride is oleamide modified nano boron nitride; the additive is selected from at least one of an antioxidant, an anti-rust agent and an extrusion anti-wear agent. The invention also discloses application of the lubricating grease composition II as lubricating oil in lubrication of axle box bearings of high-speed railway trains with the speed of not less than 400km / h.

The invention discloses a corrugated plate-shaped lithium hydroxide absorbent as well as a preparation method and application thereof, an absorbent bed layer can be naturally formed by arranging multiple layers of stacked corrugated plates with gaps, and when carbon dioxide is absorbed, pressure drop can be formed in the gaps, so that the absorption rate is ensured; meanwhile, the formula of the absorbent ensures certain strength and porosity, and dust escape is reduced while the absorption rate is ensured.

The invention relates to the technical field of preparation of a lithium ion battery positive electrode lithium supplement agent, in particular to preparation of a composite lithium supplement agent, which comprises the following steps: dissolving lithium hydroxide and oxalic acid in pure water to prepare a lithium oxalate saturated solution, and adding a metal catalyst; preparing lithium oxalate particles from the lithium oxalate saturated solution containing the metal catalyst through a spray dryer in an inert atmosphere; the lithium oxalate particles are put into a CVD rotary furnace, organic steam is introduced, the organic steam is decomposed through a metal catalyst to generate carbon, and the carbon is deposited on the surface of lithium oxalate; reducing the temperature of the CVD rotary furnace, introducing a silicon source, introducing water vapor, and coating the surface of the material with a SiO2 film; and reducing the temperature of the CVD rotary furnace, introducing a modifier, and carrying out a cross-linking reaction on the modifier and the surface of the material to obtain the final product Li2C2O4 (at) C (at) SiO2 (at) CF3. According to the invention, the defects of lithium oxalate insulation, high decomposition voltage and poor air stability are overcome.

The invention discloses micro-powder-grade lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the following steps: heating lithium hydroxide to an impurity removal temperature under a vacuum condition, and preserving heat to obtain molten lithium hydroxide; the method comprises the following steps: transferring molten lithium hydroxide into reaction equipment, continuously introducing mixed gas containing hydrogen sulfide into the molten lithium hydroxide from a gas inlet at the bottom of the reaction equipment, carrying out stirring reaction at the temperature of 470-650 DEG C, discharging a reaction product into a high-temperature centrifugal machine after the reaction is finished, and centrifuging at the temperature of 500-600 DEG C, so as to obtain the hydrogen sulfide-containing lithium hydroxide. The lithium hydroxide melt obtained through centrifugation is returned to the reaction equipment, and the precipitate obtained through centrifugation is micro-powder-grade lithium sulfide. According to the method, molten lithium hydroxide and hydrogen sulfide gas are subjected to a reaction, lithium sulfide generated through the reaction is high in melting point and can be separated out in the form of small particles, and then the lithium sulfide can be separated from unreacted lithium hydroxide melt through high-temperature centrifugation.

The invention relates to the technical field of lithium ion batteries, and provides a method for preparing lithium iron phosphate by using a titanium dioxide byproduct ferrous sulfate and application. The invention relates to a method for preparing lithium iron phosphate by using a titanium dioxide byproduct ferrous sulfate, which comprises the following steps: dissolving the titanium dioxide byproduct ferrous sulfate, adding a purifying agent for purification treatment, and filtering to obtain a purified ferrous sulfate solution; the purified ferrous sulfate solution serves as electrolyte, Fe < 2 + > is partially oxidized into Fe < 3 + >, phosphoric acid is added into the obtained mixed valence iron solution, the pH is adjusted, and iron phosphate precursor slurry is formed through aging; mixing the iron phosphate precursor slurry with an ethanolamine-water mixed solution of lithium hydroxide, and carrying out a reaction in a microwave reactor to obtain a lithium iron phosphate precursor suspension; and crystallizing the lithium iron phosphate precursor, and simultaneously introducing a carbon source steam and a silicon source steam to carry out gas-phase surface modification to obtain the lithium iron phosphate material. According to the invention, the raw material purity is improved, the powder structure is improved, and the long-cycle stability is improved.

The invention relates to the technical field of negative-electrode-free lithium batteries, in particular to a composite modification layer for a negative electrode current collector and a preparation method and application of the composite modification layer. The composite modification layer for the negative electrode current collector is prepared by the following steps: carrying out pre-lithiation treatment on montmorillonite by utilizing lithium salt and oxalic acid to obtain a first solution; performing pre-lithiation treatment on polystyrolsulfon acid by using lithium hydroxide, and mixing with an alcohol solvent to obtain a second solution; uniformly mixing the first solution and the second solution to obtain a mixed solution; and performing planar two-dimensional spraying on the surface of the negative electrode substrate by using the mixed solution, and after drying, forming a composite modification layer on the surface of the negative electrode substrate. The preparation method solves the problems that solvent molecules of a traditional modification layer are gathered due to polar groups, the desolvation process is hindered, SEI rich in organic matter is formed, and transmission of lithium ions on the surface of the modification layer is hindered.

The invention relates to a method for comprehensively recycling a positive electrode material of a waste lithium iron phosphate battery, which comprises the following steps of: (1) discharging the waste lithium iron phosphate battery: providing a power supply by the waste lithium iron phosphate battery, and electrolyzing a lithium precipitation mother solution by using a three-chamber diaphragm electrolytic bath; (2) crushing and sorting; (3) two-stage leaching: leaching the lithium iron phosphate positive electrode powder with a sulfuric acid solution generated by electrolysis of a lithium precipitation mother solution, and adding an aeration disc at the bottom of a reaction kettle for aeration; adding a dilute sulfuric acid solution generated by electrolysis of lithium precipitation mother liquor into first-section leaching residues for leaching; (4) two-stage impurity removal; and (5) preparing lithium carbonate. According to the method, the lithium precipitation mother liquor for the waste lithium iron phosphate battery is discharged to prepare the sulfuric acid and sodium hydroxide-lithium hydroxide mixed solution for production, so that residual electricity is utilized, a production reagent is saved, and the problems of high energy consumption, large lithium loss and poor sale of a byproduct sodium sulfate in evaporative crystallization of sodium sulfate are solved; and the aim of circularly and comprehensively utilizing the waste lithium iron phosphate battery is fulfilled.

The invention discloses a preparation method and application of lithium iron phosphate, and belongs to the field of lithium ion battery positive electrode materials. The preparation method comprises the following steps: (1) pre-sintering a lithium iron phosphate precursor; (2) uniformly mixing the pre-sintered lithium iron phosphate precursor with a lithium source, a phosphorus source, a doping element and a carbon source, grinding, and carrying out spray drying to obtain a spray material; and (3) carrying out sintering treatment on the spray material, and carrying out crushing and demagnetizing treatment after cooling to obtain the lithium iron phosphate. The pre-sintering temperature in the step (1) is 500-750 DEG C, and the pre-sintering time is 4-8 hours. The lithium source in the step (2) is one or more of lithium carbonate, lithium hydroxide, lithium dihydrogen phosphate and lithium phosphate; the phosphorus source is one or more of phosphoric acid, lithium dihydrogen phosphate and iron phosphate; the carbon source is at least two of glucose, cane sugar, polyethylene glycol and starch. The lithium iron phosphate provided by the invention can achieve the effects of low specific surface area, high compaction density and excellent electrochemical performance.

The invention discloses a method for extracting lithium from lithium precipitation mother liquor to obtain lithium phosphate, which specifically comprises the following steps of: performing preliminary extraction on the lithium precipitation mother liquor, performing reverse extraction by adopting a composite reverse extraction agent consisting of phosphoric acid and acetylacetone in a molar ratio of (5-15): 1, controlling the pH value of a reverse extraction system to be 5-7, and performing phase splitting to obtain a lithium phosphate wet product; and finally, adding the lithium phosphate wet product into lithium hydroxide for reaction, and filtering to obtain lithium phosphate. According to the method, efficient enrichment of lithium ions in the lithium precipitation mother liquor is achieved through the extraction and reverse extraction processes, meanwhile, through optimization of a reverse extraction system in the reverse extraction process, formation of calcium phosphate impurities is reduced, the extraction purity of lithium is improved, the morphology of lithium phosphate can be regulated and controlled in the reverse extraction process, batch stability is achieved, and the product quality is improved.

A more efficient and lower waste liquid-phase method for recovering lithium carbonate suitable for high-performance lithium applications from recycled lithium-ion battery and other sources of lithium hydroxide including aqueous solutions is described. The method uses carbon dioxide gas to directly form lithium carbonate from a lithium hydroxide including solution, thus eliminating the need for conventional acid pre-treatment and reducing the need for subsequent sodium carbonate addition.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

The invention discloses a method for measuring the purity of lithium hydroxide based on a gravimetric method, which comprises the following steps: weighing a lithium hydroxide sample, mixing with an organic reagent 1 in batches, and heating to obtain a primary reactant; fully mixing the primary reactant with an organic reagent 2, filtering, collecting filtrate, diluting, adjusting the pH value to 6-6.5, and adding diethyl ether for extraction to obtain a lower-layer lithium chloride solution; adding a precipitant into the solution, reacting under a constant-temperature water bath condition, filtering and drying the obtained filter residue to constant weight, and calculating the purity of the lithium hydroxide according to the constant weight. According to the method, carbonate interference is avoided through the selective organic reagent, the content of the lithium hydroxide is directly measured through the gravimetric method, the detection process is simplified, dependence on operators and large equipment is reduced, the method has the advantages of being high in accuracy, good in repeatability, wide in application range and low in detection cost, and rapid and accurate measurement of the purity of the lithium hydroxide can be achieved.

The present invention relates to a process for preparing lithium sulfide (LiS) from lithium hydroxide (LiOH) and hydrogen sulfide (HS), characterized in that the lithium hydroxide is sulfided in a reaction zone (9) comprising at least one moving-bed tubular reactor (9a) with an ascending oscillating spiral configuration, in which the lithium hydroxide (4) circulates countercurrently to an anhydrous gas mixture (10) containing hydrogen sulfide and at least one inert gas.

The application provides a method for preparing lithium iron phosphate by using waste lithium isooctanoate catalyst, and comprises the following steps: grinding and sieving the waste lithium isooctanoate catalyst to obtain lithium isooctanoate powder; mixing the lithium isooctanoate powder with water, adding concentrated hydrochloric acid to perform leaching reaction to obtain leaching slurry; filtering the leaching slurry to obtain filtrate and residue; adding activated carbon to the filtrate to perform adsorption and filtration, then adding HCl and FeCl3·6H2O to stir, and controlling the pH of the solution to be 1.0-1.5 to obtain an aqueous phase; uniformly mixing tributyl phosphate and sulfonated kerosene to obtain an organic phase; mixing, oscillating, standing and separating the aqueous phase and the organic phase to obtain an extraction phase and a raffinate phase; washing the extraction phase by using dilute hydrochloric acid to remove impurities, adjusting the molar ratio of P, Fe and Li in the extraction phase after impurity removal, adding a carbon source to obtain mixed slurry; performing spray drying on the mixed slurry, and performing high-temperature sintering, crushing and screening on the powder obtained by spray drying to remove iron, so as to obtain lithium iron phosphate. The application scheme realizes resource recycling and utilization, and the prepared product has high quality and low cost.

This invention provides a method for producing a lithium-metal composite oxide using a two-stage firing process comprising a preliminary firing step for heating a precursor compound of a lithium-metal composite oxide and a lithium compound at a temperature of 500ºC to 650ºC to obtain a preliminary fired product; a pelletizing step for producing a pellet of the preliminary fired product; and a firing step for firing the pellet at a temperature of 700ºC to 1000ºC, such method is capable of minimizing the difference between a raw material metal ratio and the metal composition in a lithium-metal composite oxide, which occurs as a result of lithium element volatilization, and minimizing corrosion of a furnace body by lithium hydroxide.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite lithium supplement agent with stable wet air and a preparation method thereof. The composite lithium supplement agent comprises a lithium supplement material and a coating material, the wet air stability of an existing lithium supplement agent is improved, and the stability of the structure and performance of the lithium supplement agent in a wet air atmosphere is realized, and the preparation method comprises the following steps: (1) compounding the lithium supplement material and boric acid; and (2) putting the composite powder of the lithium supplementing material and boric acid into a high-temperature furnace, and carrying out heat treatment, so that boric acid reacts with the lithium supplementing material and lithium hydroxide and lithium carbonate on the surface of the lithium supplementing material to generate a coating layer, thereby obtaining the composite lithium supplementing agent with stable wet air. The wet air stability of the prepared composite lithium supplementing agent is greatly improved, and the lithium supplementing capacity is kept to be 92% or above after the composite lithium supplementing agent is exposed for 8 hours in air with the humidity of 30%; and the preparation process is simple, the production cost is low, the adaptability to the existing lithium ion battery preparation process is good, large modification is not needed, and the method is easy to popularize.

The application belongs to the technical field of lithium ion battery electrode materials, and specifically discloses a one-dimensional lithium manganate nanorod with controllable diameter and a preparation method and application thereof. The application disperses manganese sulfate, potassium permanganate, a structure directing agent and a surfactant into a solvent, carries out a hydrothermal reaction, and obtains black precipitate; then the black precipitate is sintered to obtain manganese dioxide nanorods; the manganese dioxide nanorods are mixed with lithium hydroxide, and two-stage sintering is carried out to obtain one-dimensional lithium manganate nanorods. The one-dimensional lithium manganate nanorods are uniform in thickness and have very small surface energy, when used as a positive electrode material, can effectively shorten the transmission path of lithium ions, are not prone to agglomeration and have good flexibility, can maintain the integrity of the structure during long-time service under a large current, and are beneficial to improving the rate and cycle performance of the electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of the manganese dioxide can be accurately adjusted, and the controllable preparation of the one-dimensional lithium manganate can be realized.

The invention provides a preparation method of lithium hydroxide, and relates to the technical field of salt lake lithium extraction. The preparation method of the lithium hydroxide comprises the following steps: S1, uniformly mixing a nanofiltration concentrated solution with a lithium precipitation mother solution, carrying out heating reaction, and filtering to obtain a mixed solution A; s2, the mixed solution A is subjected to impurity removal through a resin column, and a mixed solution B is obtained; s3, concentrating and crystallizing the mixed solution B to obtain a mixed solution C; s4, adding an acid solution into the mixed solution C to adjust the pH value, and then performing electrodialysis to obtain a mixed solution D; s5, the mixed solution D is subjected to boron removal through a resin column, and a purified solution is obtained; s6, the purified liquid is subjected to bipolar membrane electrodialysis, and a lithium hydroxide solution and an acid solution are obtained; and S7, evaporating, concentrating, crystallizing and centrifuging the lithium hydroxide solution to obtain lithium hydroxide. According to the method, the nanofiltration concentrated liquor and the lithium precipitation mother liquor are used for treating wastes with wastes, so that efficient recovery of lithium and green preparation of lithium hydroxide are realized.

This method comprises: mixing a first solution containing a metal nitrate with a second solution containing lithium hydroxide to precipitate a metal hydroxide; thermally decomposing lithium nitrate produced from the metal nitrate and the lithium hydroxide; and recovering lithium oxide contained in the thermal decomposition product of the lithium nitrate. This method may further comprise converting lithium oxide into lithium hydroxide and reusing the lithium hydroxide.

The present disclosure is directed to systems and methods of leaching lithium sources using sodium sulfate. The process can include mixing a lithium source, a first sodium sulfate, and lithium hydroxide in a reactor and leaching the lithium source in the mixture in the reactor to form residual solids and a lithium sulfate leachate.

A pretreatment method for a lithium-containing solution, according to the present invention, comprises: an adsorption step of passing a lithium-containing solution through an adsorbent so as to obtain a lithium-adsorbed adsorbent; a washing step of passing a pretreatment solution containing divalent cations through the lithium-adsorbed adsorbent, so as to remove impurities; a desorption step of passing a medium through the lithium-adsorbed adsorbent so as to obtain a lithium-containing desorption solution; and a step of injecting the lithium-containing desorption solution into an electrodialysis device so as to obtain a lithium hydroxide aqueous solution.

The invention provides a preparation method for synthesizing lithium sulfide from industrial-grade lithium hydroxide and sodium sulfide, a preparation method for a solid electrolyte and a solid-state battery, and the preparation method for synthesizing lithium sulfide from industrial-grade lithium hydroxide and sodium sulfide comprises the following steps: dissolving an industrial-grade lithium hydroxide raw material, and sequentially carrying out oxidation, filtration, washing and drying to obtain lithium sulfide; sodium sulfide and a flocculating agent are added for precipitation and filtration, then sodium carbonate and barium nitrate are sequentially added for impurity removal and filtration, and a lithium hydroxide purified solution is obtained; reacting the sodium sulfide solid with dilute sulphuric acid to obtain hydrogen sulfide gas; hydrogen sulfide gas is introduced into the lithium hydroxide purification liquid for a reaction, and lithium sulfide slurry is obtained; evaporating, concentrating and crystallizing the lithium sulfide slurry, and centrifugally separating; and carrying out vacuum calcination on the crystal, and crushing to obtain lithium sulfide powder. Through oxidative conversion, chemical precipitation and crystallization purification, efficient and deep removal of impurities is realized, the problems that raw material components are complex and difficult to separate are solved, and the purity of lithium sulfide is improved.

The application discloses a method for preparing lithium iron phosphate by taking ferrous phosphide as raw material and a product, relates to the technical field of green and sustainable development of the steel industry and new energy materials, and comprises the following steps: preparing ferrous phosphide by taking steel slag and phosphorus tailings as raw materials, using nitric acid to leach the ferrous phosphide, controlling the pH of leaching to be 2.5-3, and controlling the leaching time to be 2-5 hours; adding phosphoric acid in the leaching solution, controlling the Fe / P molar ratio in the solution after adding the phosphoric acid to be 0.6-0.8; filtering the leaching solution, and roasting the filtered precipitate in an air atmosphere at 700-900 DEG C for 10-12 hours; mixing the roasted product with lithium hydroxide and glucose, and mixing the raw materials according to the molar ratio of FePO4:LiOH.H2O:C6H 12 O6 being 1:1.06:0.18-0.21; pressing the mixed raw materials into blocks, and roasting the blocks under an inert atmosphere at 700 DEG C for 10 hours, so that lithium iron phosphate is obtained. The application realizes bidirectional green development of the steel industry and the new energy industry by preparing lithium iron phosphate materials by using steel slag recovery products.

The application discloses a method for recycling waste lithium battery positive electrode materials by oxalic acid circulation and lithium hydroxide co-production. The method uses oxalic acid solution to leach the waste lithium battery positive electrode materials, so that the valuable metals are precipitated in the form of oxalate, after solid-liquid separation, the lithium oxalate solution is introduced into an integrated electrochemical recycling system. The system is provided with an ion separation chamber filled with anion exchange resin between the cathode chamber and the anode chamber in the electrolytic cell, which constitutes Li + purifier and H + Traps: the resin fixes oxalate on one hand, promotes Li + dissociation, on the other hand, captures and neutralizes H + migrated from the anode in situ to generate oxalic acid; at the same time, Li + goes through the cathode side cation exchange membrane, and combines with OH ‑ generated by electrolysis to form a lithium hydroxide solution. The regenerated oxalic acid solution can be used for leaching, and the oxalic acid reagent circulation is realized, and the high-purity lithium hydroxide product significantly improves the overall process economy.

The application discloses a preparation method of a microcrystalline glass binder for a semiconductor wafer thinning grinding wheel, which comprises the following steps: obtaining a plurality of raw materials of the microcrystalline glass binder, including ethyl orthosilicate, pseudo-boehmite, lithium hydroxide sol, boric acid, sodium nitrate, potassium nitrate, chromium hydroxide sol and butyl titanate; mixing the plurality of raw materials in a first solvent and sufficiently hydrolyzing to obtain a homogeneous precursor solution; then adding a PH adjusting substance, a non-polar solvent, lithium hydroxide sol and chromium hydroxide sol in sequence to obtain a homogeneous sol system; adding boric acid powder, sodium nitrate powder and potassium nitrate powder into the homogeneous sol system and performing heating and stirring to obtain a homogeneous mixed sol; performing aging and drying on the homogeneous mixed sol to obtain a mixed gel; and performing dry ball milling and wet ball milling on the mixed gel to obtain a microcrystalline glass binder powder. The microcrystalline glass binder prepared according to the application has a relatively low softening temperature and has relatively high strength and wettability.

The present invention relates to a method for recovering lithium from a lithium-containing waste liquid, the method including the steps of: filtering a cathode material wash solution to separate solid metals contained in the basic waste liquid; adding sulfuric acid to the cathode material wash solution from which the solid metals have been filtered to acidify it and convert lithium carbonate or lithium hydroxide into lithium sulfate; concentrating the wash solution converted into lithium sulfate to obtain a high-concentration lithium sulfate solution; and mixing the high-concentration lithium sulfate solution with a resultant product obtained by leaching from an ore.