268results about "Lithium oxides/hydroxides" patented technology

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 application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

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

The invention relates to a resource-saving method for producing alkali-metal-containing cathode active materials, which forgoes the use of additional, purified water through the use of condensate water from the precursors. The invention also relates to the purification of the alkali-metal-containing washing water that arises during the production of cathode active material. According to the invention, alkali-metal precursor recovered in the process is fed back to the production process.

Lithium oxide argyrodites having the formula Li(6−y)PS4O(1−y)X(1+y) where X is a halide anion and y is a number between 0 and 0.8, inclusive, are provided herein. Also provided are methods of synthesizing the lithium oxide argyrodites and composites including the lithium oxide argyrodites, as well as other alkali metal oxide argyrodites and related methods and composites.

A process for producing lithium hydroxide monohydrate from lithium chloride, the process comprising: (a) adding an aqueous potassium ion and hydroxide ion-containing solution to an aqueous lithium chloride-containing solution, thereby obtaining a mixture comprising lithium hydroxide, potassium chloride and water, (b) selectively precipitating potassium chloride from the mixture, thereby obtaining potassium chloride precipitate and a first mother liquor solution, (c) separating the potassium chloride precipitate from the first mother liquor solution, (d) processing the potassium chloride precipitate to obtain an aqueous potassium hydroxide-containing solution, (e) adding the aqueous potassium hydroxide-containing solution to the separated first mother liquor solution, thereby obtaining a potassium hydroxide-enriched first mother liquor solution, and (f) selectively precipitating lithium hydroxide monohydrate from the potassium hydroxide-enriched first mother liquor solution, thereby obtaining lithium hydroxide monohydrate precipitate and a second mother liquor solution.

The invention provides a lithium-rich manganese-based positive electrode material and a preparation method thereof, and a secondary battery, the positive electrode material comprises a spinel phase surface transition layer, the molecular formula of the lithium-rich manganese-based positive electrode material is LixMyAaBbO2, M is Mn, Mn / Ni, Mn / Co or Mn / Ni / Co, A is lithium ion vacancy, B is oxygen ion vacancy, 1lt; xlt; 1, 1.2, 0.8 lt; yt; Yt; 1, 0lt; a < lt >; 0.1, 0 lt; blt; and 0.05%. According to the lithium-rich manganese-based positive electrode material, the preparation method thereof and the secondary battery, the lithium-rich manganese-based positive electrode material is subjected to surface treatment, in-situ construction of a surface buffer layer is realized, the stability of combination with a matrix is improved, and stable material dynamics improvement is 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.

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 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.

The invention discloses a preparation method of an adsorbent and a process method for adsorbing and extracting lithium from oilfield brine, and the preparation method comprises the following steps: dissolving a lithium salt and an aluminum salt in a solvent to prepare a lithium-aluminum mixed solution; dissolving alkali in a solvent to prepare an alkali solution; setting the temperature and the rotating speed of a supergravity reactor, pumping the lithium-aluminum mixed solution and the alkali solution into the supergravity reactor, enabling the obtained product slurry to flow out from an outlet of the supergravity reactor, and adjusting the pH value of the product slurry; filtering, washing and drying the product slurry subjected to pH regulation to obtain aluminum adsorbent powder; and carrying out cross-linking granulation on the aluminum adsorbent powder and a forming agent, and washing to remove lithium to obtain the granular aluminum adsorbent. And an efficient adsorption and desorption process is matched, so that the lithium recovery rate is greater than or equal to 90%, and a battery-grade lithium salt product with a high additional value is obtained. The adsorbent prepared by adopting a supergravity method has the advantages of small particle size and uniform distribution, and the obtained adsorbent is high in lithium adsorption capacity and low in solution loss rate.

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 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 invention belongs to the technical field of lithium salt preparation, and provides a method for preparing battery-grade lithium hydroxide monohydrate by causticizing lithium carbonate. According to the method, raw material washing and ion exchange purification are combined with a multi-stage crystallization impurity removal process including evaporation concentration, rotational flow classification and elutriation to achieve a synergistic effect, so that the impurity content of the product is effectively controlled, and a lithium carbonate component causing scaling is actively removed; therefore, the scaling problem of evaporative crystallization equipment is remarkably relieved while the product purity is improved, and the lithium hydroxide monohydrate meeting the battery-grade quality requirement is stably and continuously produced by taking the industrial-grade lithium carbonate as the raw material.

The application relates to the technical field of lithium hydroxide, and particularly discloses coated modified anhydrous lithium hydroxide and a preparation method thereof. The coated modified anhydrous lithium hydroxide is prepared by the following steps: weighing an internal matrix and an external coating modifier; the internal matrix is anhydrous lithium hydroxide, and the external coating modifier is one of polyaspartic acid, polyacrylamide or polyacrylic acid; the external coating modifier is dissolved in deionized water to prepare a coating modifier solution; the matrix is coated with the coating modifier solution to obtain wet coated modified anhydrous lithium hydroxide; and the wet coated modified anhydrous lithium hydroxide is dried to obtain the coated modified anhydrous lithium hydroxide. The coated modified anhydrous lithium hydroxide has a physical coating layer on the surface of the anhydrous lithium hydroxide, the operation is simple, the particle hardness can be increased, the dust diffusion caused by collision and friction on the particle surface can be effectively reduced, and the dust raising problem is solved. The coated modified anhydrous lithium hydroxide can guarantee the effective absorption agent content and absorption performance, improve the use safety of the lithium hydroxide absorption agent, and meet the requirements of products of the anhydrous lithium hydroxide in multiple fields.

The application relates to the technical field of lithium hydroxide production, and discloses a processing technology for preparing battery-grade lithium hydroxide, which comprises the following steps: lithium ore is crushed to a reasonable particle size and then is sent into a roasting furnace, lithium ore is destroyed through high-temperature roasting, the roasted ore clinker is sent into a reaction kettle, sulfuric acid solution is added to carry out acidification reaction, then water is added to carry out leaching, and a crude leaching solution containing lithium sulfate is obtained. The application is provided with a sealing element, the large contact area design of the L-shaped sealing strip improves the reliability of the primary sealing, the cooperation of the elastic pressing strip and the spring can effectively compensate for the slight deformation in the equipment operation process, the stability of the sealing performance is ensured, the double-sealing structure can effectively prevent the leakage of the heat exchange medium, the problems of resource waste, environmental pollution and equipment damage caused by medium leakage are avoided, the influence of cross contamination of different media on product quality is also avoided.

The preparation method comprises the following steps: mixing a lithium source material, water, a first solvent and quaternary amine alkali, reacting the quaternary amine alkali with carbon dioxide in a reaction atmosphere containing carbon dioxide to generate HCO3 <->, reacting the HCO3 <-> with lithium ions in the lithium source material to generate lithium bicarbonate, and collecting a water phase after the reaction; decomposing lithium bicarbonate in the water phase to generate lithium carbonate, collecting a solid phase, and decomposing lithium carbonate in the solid phase to generate lithium oxide to obtain an intermediate; dissolving quaternary ammonium iodide in a second solvent, adding the intermediate, converting the lithium oxide into lithium hydroxide, carrying out ion exchange on the lithium hydroxide and the quaternary ammonium iodide to generate lithium iodide, and collecting a liquid phase; and collecting the lithium iodide in the liquid phase. According to the present invention, based on the characteristics of the specific quaternary ammonium base and the quaternary ammonium iodide salt, the Li in the lithium source material is selectively reinforced, carbonized and leached, the anion impurities in the lithium source material are removed, the anion exchange in the organic phase is achieved, and the high-purity anhydrous lithium iodide is prepared.

This invention provides a cost-effective and simple method for forming electrode active materials and the products thereof. [Solution] A method for forming an electrode active material is provided, comprising the steps of: mixing lithium hydroxide and an active material precursor to form a precursor mixture, wherein the lithium hydroxide contains a D50 particle size of at least 150 μm; heating the precursor mixture at a homogenization temperature to form a homogenization mixture; and sintering the homogenization mixture at a sintering temperature to form a final mixture containing an electrode active material, wherein the homogenization temperature is less than the sintering temperature.

The method for isolating a lithium precursor according to the embodiment of the present application includes the steps of preparing a primary precursor mixture including a primary lithium precursor and a primary transition metal precursor, mixing the primary precursor mixture with a precipitation solution in a reactor to form a precursor mixture, and injecting a non-reactive gas into the precursor mixture. Accordingly, the lithium precursor can be isolated with high purity and high efficiency.

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.

A method for producing battery-grade lithium dihydrogen phosphate using lithium-containing brine includes the following steps: (1) adding sodium hydroxide solution to lithium-containing mother liquor, adding the mixed solution to sodium dihydrogen phosphate solution, maintaining the pH of the system at 9-11, reacting, separating the solid and liquid phases to obtain lithium phosphate precipitate and mother liquor; (2) adjusting the slurry, adding concentrated sulfuric acid to react, separating the solid and liquid phases to obtain a mixed solution of liquid-phase lithium dihydrogen phosphate and lithium sulfate; (3) vacuum cooling and crystallization separation to obtain lithium dihydrogen phosphate crystals. This invention achieves efficient recovery of lithium ions from low-concentration lithium-containing brine, eliminating the need for conventional processes such as electrodialysis and MVR for further concentration of lithium-containing mother liquor. It also avoids the use of phosphoric acid in the acidification process, saving raw material costs, reducing the amount of water added in the acidification process, and reducing energy consumption in the crystallization separation process. The resulting battery-grade lithium dihydrogen phosphate is of stable quality, uniformly distributed, and bright white in color, suitable for preparing lithium-ion battery cathode materials, and has a low cost.

The invention pertains to a process for recovering materials from a stream comprising black mass solids obtained from lithium-ion batteries, the process comprising: i) providing a stream comprising the black mass solids, lithium, cobalt, aluminum, manganese, nickel, iron, copper; ii) leaching the stream with an acid to form a pregnant leach solution and residual solids; iii) separating the pregnant leach solution from the residual solids; iv) isolating a copper product from the pregnant leach solution; v) isolating an aluminum (Al) and / or iron (Fe) product from the pregnant leach solution; vi) isolating a manganese (Mn) product from the pregnant leach solution; vii) isolating a cobalt (Co) product from the pregnant leach solution; viii) isolating a nickel (Ni) product from the pregnant leach solution; ix) isolating a salt by-product from the pregnant leach solution; and x) isolating a lithium product from the pregnant leach solution.

Provided is a bipolar electrodialysis apparatus for producing lithium hydroxide, including, in sequence, an anode, a first bipolar membrane, an anion-selective ion exchange membrane, a cation-selective ion exchange membrane, a second bipolar membrane, and a cathode, the apparatus comprising: an acidic solution compartment which is formed between the first bipolar membrane and the anion-selective ion exchange membrane and in which an acidic solution is generated; a basic solution compartment which is formed between the second bipolar membrane and the cation-selective ion exchange membrane and in which a basic solution is generated; and a salt solution compartment which is formed between the anion-selective ion exchange membrane and the cation-selective ion exchange membrane, wherein a lithium salt aqueous solution is introduced into the salt solution compartment, water is introduced into each of the acidic solution compartment and the basic solution compartment, an electrode solution is introduced between the anode and the first bipolar membrane and between the cathode and the second bipolar membrane, and the electrode solution includes a redox compound.

A process for preparing metal oxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum. The process comprising:reacting a metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum with lithium hydroxide and optionally a chelating agent to obtain a solid comprising a metal hydroxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum, and a liquid comprising lithium sulfate, the metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum;separating the liquid and the solid from one another to obtain the metal hydroxide;submitting the liquid comprising lithium sulfate to an electromembrane process for converting the lithium sulfate into lithium hydroxide; andreusing at least a first portion of said lithium hydroxide obtained by the electromembrane process for reacting with the metal sulfate;reacting at least a second portion of said lithium hydroxide obtained by the electromembrane process with the obtained metal hydroxide to obtain a mixture of metal hydroxides; androasting said mixture of metal hydroxides to obtain the metal oxide.

A method for producing lithium hydroxide includes: a first crystallization step of concentrating a lithium hydroxide solution containing carbonate ions to precipitate and separate crystals containing lithium carbonate; and a second crystallization step of concentrating the lithium hydroxide solution after the first crystallization step in a reduced pressure atmosphere to obtain crystals containing lithium hydroxide.

A process for producing alumina and a lithium salt comprising the steps of: (a) calcining an alpha spodumene ore or concentrate to produce beta spodumene; and (b) (I) leaching beta spodumene from the calcining step (a) with an alkaline solution under pressure; or (II) sulphating beta spodumene with at least sodium sulphate and leaching said sulphated beta spodumene to produce a lithium containing solution and a zeolitic residue. The lithium containing solution is treated to provide a purified lithium salt and said zeolitic residue is treated to provide high purity alumina.

The application provides a preparation method of LiAl5O8 powder and LiAlON transparent ceramic and belongs to the technical field of transparent ceramic materials. After slurry is prepared, the preparation method is freezing drying first to obtain loose mixed material without large-particle hard agglomeration, then low-temperature solid-phase reaction is carried out, and the material is rotated and mixed every 30 minutes during the heat preservation process to realize uniform heat treatment of the material. In the application, the preparation method of the LiAl5O8 powder is a low-temperature solid-phase reaction method, and the reaction condition is simple, the cost is low, and the efficiency is high. The prepared LiAl5O8 powder is single-phase, the particle is small, the distribution is uniform, there is no large-particle agglomeration, the reaction activity is high, the dispersibility is good, and the subsequent high-energy ball milling is not needed for refinement, so the prepared LiAl5O8 powder can be directly applied to the preparation of the LiAlON transparent ceramic, and the optical transmittance of the transparent ceramic is improved.

The invention relates to a method for preparing a material capable of extracting lithium, comprising the following steps: (a) preparing a geopolymer mixture by mixing (i) an activating solution comprising at least lithium hydroxide and (ii) an aluminosilicate source; (b) curing the geopolymer mixture prepared in step a), thereby obtaining a geopolymer matrix material; and (c) washing the geopolymeric matrix material obtained in step b) so as to remove at least a portion of the lithium cations (Li +) contained in the geopolymeric matrix material and obtain a material capable of extracting lithium The invention also relates to the material thus obtained and to the use thereof.