343 results about "Lithium chloride" patented technology

This invention discloses a method for leaching lithium iron phosphate mixed powder with iron salts and recovering all components, belonging to the field of battery recycling. The invention uses an iron salt solution to leach the mixed powder, obtaining a lithium-containing leachate and leaching residue. Ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, and recycled for leaching the next batch of mixed powder. After reaching a preset number of cycles, the leachate is used for re-leaching multiple batches of leaching residue to improve the lithium leaching rate. Ultimately, a enriched solution containing Li, Fe, Cu, and Al and graphite-containing iron phosphate residue are obtained. Copper is recovered from the enriched solution through iron powder replacement, and a high-purity lithium chloride solution is obtained through extraction and separation, while ferric chloride (recycled) and aluminum chloride crystals are also recovered. The leaching residue is treated with hydrochloric acid to obtain regenerated graphite, and the pH is adjusted with alkali to obtain high-purity iron phosphate. This method achieves full component recovery under mild conditions, reducing separation steps and chemical consumption through a "leaching-regeneration-leaching" cycle mechanism, thus achieving both environmental and economic benefits.

The invention discloses a composite coated graphite negative electrode material, a preparation method thereof and a lithium ion solid-state battery, and belongs to the technical field of lithium ion solid-state batteries, the composite coated graphite negative electrode material comprises a graphite matrix and a composite coating layer, and the composite coating layer comprises an inner layer amorphous lithium chloride and an outer layer nanocrystalline LiF / Li3N composite phase. Mixing graphite, lithium chloride containing crystal water and ammonium fluoride to obtain a mixed material; placing the mixed material in a microwave reaction cavity, heating the mixed material to 600-700 DEG C at the microwave power of 800-1200 W in an H2 / Ar mixed atmosphere, and keeping the temperature for 20-60 minutes; and cooling the sintered mixed material, grinding, and sieving with a 100-300 mesh sieve to obtain the composite coated graphite negative electrode material with a coating layer thickness of 10-50 nm. The invention provides an innovative amorphous LiCl / nanocrystalline LiF-Li3N gradient coating layer design, the performance of the lithium ion battery is remarkably improved by optimizing an ion migration path, enhancing the interface stability and reducing the process cost, and a new engineering way is provided for realizing high magnification and long cycle performance of the sulfide all-solid-state battery.

The present disclosure provides methods of manufacturing psilocybin and crystalline psilocybin via a reaction of psilocin and tetrabenzylpyrophosphate in the presence of lithium chloride complex Grignard reagent, which is followed by hydrogenation. Methods of producing psilocin from 4-hydroxyindole or 4-acetoxyindole are also provided.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-sulfur-phosphorus-chlorine-bromine solid-state electrolyte, a preparation method thereof and an all-solid-state battery. The preparation method comprises the following steps: mixing lithium sulfide and phosphorus sulfide, and carrying out ball milling to obtain a lithium-sulfur-phosphorus ternary mixture; in protective gas, the lithium-sulfur-phosphorus ternary mixture, lithium chloride and lithium bromide are mixed and then subjected to ball milling, and a lithium-sulfur-phosphorus-chlorine-bromine mixture is obtained; and carrying out heat treatment on the lithium-sulfur-phosphorus-chlorine-bromine mixture in protective gas to obtain the lithium-sulfur-phosphorus-chlorine-bromine solid electrolyte. The lithium-sulfur-phosphorus-chlorine-bromine solid electrolyte provided by the invention not only improves the electrochemical stability, but also maintains the high ionic conductivity characteristic.

The invention relates to the technical field of polymer photoelectric materials, in particular to a preparation method of a supramolecular gel electrolyte. The method comprises the following steps: esterifying tetraphenylethylene alcohol and methacryloyl chloride to form tetraphenylethylene methacrylate, and performing staged linear heating polymerization on the tetraphenylethylene methacrylate, 3-(methacrylamido) propyl dimethyl 3-thiopropyl ammonium oxide inner salt, acrylic acid, tetraphenylethylene methacrylate and 4-vinylpyridine under the action of ammonium persulfate to obtain a tetraphenylethylene copolymer. And finally, soaking in a lithium chloride aqueous solution to obtain the supramolecular hydrogel electrolyte. The hydrogel obtained by the invention has high mechanical strength and high ionic conductivity, and is suitable for energy storage devices such as flexible supercapacitors and the like.

The invention discloses a preparation method of lithium trifluoromethanesulfinate, and belongs to the field of lithium ion battery materials. The preparation method of the lithium trifluoromethanesulfinate comprises the following steps: 1, mixing trifluoromethanesulfonyl chloride, lithium sulfite, lithium bicarbonate and a first solvent, and heating to react; 2, dissolving the concentrated crude product in a second solvent, and filtering and separating a lithium sulfate solid; and 3, concentrating the filtrate, adding a third solvent, uniformly stirring, filtering and separating the lithium chloride solid, and concentrating to obtain the lithium trifluoromethanesulfinate. According to the method for preparing the lithium trifluoromethanesulfinate, the yield can reach 94%, the operation is simple, byproducts are easy to separate, and the method is suitable for industrial production. In addition, the obtained by-product lithium sulfate can be used for preparing lithium sulfide, the by-product lithium chloride can be used for preparing solid electrolyte, and resource utilization is achieved.

The invention belongs to the technical field of thermoelectricity, and relates to a preparation method and application of a quasi-solid thermoelectric material capable of realizing humidity stability by means of phase separation regulation, the preparation method comprises the following steps: dissolving a negatively charged hydrophilic monomer, an electrically neutral monomer, a cross-linking agent and a photoinitiator in a solvent to obtain a precursor solution, and carrying out an ultraviolet polymerization reaction to form polyelectrolyte gel; mixing the eutectic solvent with an electrolyte aqueous solution containing redox ion pairs and lithium chloride to obtain a quaternary electrolyte system; and immersing the gel into a quaternary electrolyte system, and fully replacing the internal solution through a diffusion effect to obtain the quasi-solid thermoelectric material with stable humidity. The thermoelectric material has the advantages of excellent Seebeck coefficient, good stability, high mechanical strength, large power density and the like, can supply power to wearable electronic products in an actual humidity fluctuation environment, breaks through the main bottleneck of actual application of quasi-solid ionic thermoelectric materials based on ionized water gel, and is wide in application prospect.

The invention discloses a halide electrolyte electrode material, a composite positive electrode, an all-solid-state battery and a preparation method of the all-solid-state battery. The chemical formula of the halide electrolyte electrode material is Li Zr T < c > Cl < d >, the preparation method of the halide electrolyte electrode material comprises the following steps: mixing titanium chloride, zirconium chloride and lithium chloride according to a stoichiometric ratio to obtain precursor powder, and placing the precursor powder in a first protective atmosphere for ball milling to obtain premixed amorphous precursor powder; and placing the premixed amorphous precursor powder in a second protective atmosphere, and calcining at 200-400 DEG C, thereby obtaining the product. And mixing the halide electrolyte with commercial lithium iron phosphate and conductive carbon to obtain the composite positive electrode. The all-solid-state battery assembled based on the positive electrode material shows higher energy density. The material provided by the invention has good structural stability and excellent charge-discharge cycle performance.

The invention provides a process for preparing high-purity lithium sulfide based on industrial waste salt recycling, which comprises the following steps: S1, mixing sulfur-containing waste salt and a waste carbon material, granulating, reducing, calcining, separating and purifying to obtain solid sodium sulfide; s2, mixing and ball-milling the obtained solid sodium sulfide and lithium chloride, adding a mixture of a catalyst and ethanol, and performing catalytic reaction to obtain a lithium sulfide crude product; and S3, purifying and drying the obtained lithium sulfide crude product to obtain the lithium sulfide. The method not only can break through the bottleneck of the existing production route, but also can realize the strategic direction of high-value utilization of bulk solid wastes, and has far-reaching significance for promoting sustainable development and green transformation of the battery industry.

The invention relates to the technical field of lithium battery materials, in particular to a method for preparing battery-grade lithium carbonate from waste lithium batteries. The method comprises the following steps: disassembling, crushing and sieving a recycled lithium iron phosphate battery to obtain a crushed lithium battery material; a choline chloride-citric acid mixed solution is adopted to conduct leaching treatment on the crushed materials, and sulfuric acid is added to inhibit leaching of iron and phosphorus ions; filtering to obtain a first filtrate and a first filter residue; adding calcium hydroxide into the first filtrate, and filtering to obtain second filtrate and second filter residues; adsorbing the second filtrate with activated carbon to remove impurities, and filtering to obtain a third filtrate and a third filter residue; adding hydrochloric acid into the third filtrate to obtain a lithium chloride solution; carbonizing and converting the lithium chloride solution into a lithium carbonate solution; and carrying out gradient crystallization treatment on the lithium carbonate solution, pulping with pure water, and drying to obtain the high-purity lithium carbonate finished product. The method overcomes the problems of low lithium recovery rate, complex process, low lithium carbonate purity, large crystal particle size, more impurities and the like of the existing lithium iron phosphate battery.

The invention discloses green leaf-imitated porous hydrogel as well as a preparation method and application thereof, and belongs to the technical field of hydrogel materials. The preparation method of the green leaf-imitated porous hydrogel comprises the following steps: mixing polyvinyl alcohol, tannic acid and a composite pigment in a solid state, and grinding to form uniformly dispersed mixed powder; then spraying a glutaraldehyde solution to the mixed powder, carrying out a cross-linking reaction at room temperature, and washing after the reaction to obtain hydrogel; soaking the hydrogel in a lithium chloride solution, and taking out the hydrogel after soaking to obtain the green leaf-imitated hydrogel with the automatic moisture absorption function; the hydrogel has a porous structure, can automatically absorb moisture and simulate a vegetation spectrum in a 400-2500nm wave band at high precision, is suitable for covering the surface of fabric or equipment so as to simulate the spectrum and thermal characteristics of vegetation, and can be widely applied to the field of infrared camouflage.

The invention belongs to the technical field of semiconductor oxide gas sensors, and particularly relates to an rGO / CuO / Li sensitive material, a preparation method thereof and application of the rGO / CuO / Li sensitive material in H2S sensors. The preparation method comprises the following steps: firstly, preparing a graphene oxide nanosheet by using an improved Hummers method, and then preparing the rGO / CuO / Li sensitive material by using copper nitrate, lithium chloride and the prepared graphene oxide nanosheet as raw materials, polyvinylpyrrolidone as a surfactant and N, N-dimethylformamide as a solvent by using a one-step solvothermal method. Under the condition of room temperature, the sensitive material shows a relatively high response value (220.1) and a relatively low detection lower limit (1ppb) on hydrogen sulfide, has good selectivity, repeatability and stability, and has a wide application prospect in trace-level hydrogen sulfide detection in the fields of industrial safety and atmosphere detection.

The invention belongs to the technical field of mineral flotation, and particularly relates to a cellulose-based coal slime collecting agent and a preparation method and application thereof. The method comprises the following steps: performing wet grinding on recycled waste paper to obtain a paper pulp solution, stirring until paper pulp fibers are uniformly dispersed, adding excessive lithium chloride and sodium periodate, performing stirring reaction, cleaning and centrifuging to obtain precursor cellulose, performing amino alkylation modification to obtain amino alkyl cellulose, preparing the amino alkyl cellulose into a 20 g / L solution, and performing vacuum drying to obtain the lithium ion battery cathode material. And then uniformly mixing with non-polar hydrocarbon oil according to the volume ratio of 1: 2 to obtain the coal slime collecting agent. The prepared coal slime collecting agent contains the hydrophobic nanocellulose with the large length-diameter ratio, in the flotation process, adhesion of bubbles and minerals can be promoted, diffusion of the bubbles is promoted, and the flotation efficiency and the recovery rate are improved.

The invention discloses a low-cost nano porous silicon-carbon composite material based on a solid waste silicon source as well as a preparation method and application thereof. The preparation method comprises the following steps: taking a solid raw material containing silicon dioxide as a silicon source; carrying out wet ball milling on the pretreated raw materials; mixing the ball-milled material with magnesium powder, aluminum chloride and lithium chloride; carrying out heating reduction reaction on the mixed material; sequentially performing hydrochloric acid pickling and hydrofluoric acid pickling on the reduction product, and then washing to be neutral; mixing the washed silicon particles with a carbon precursor containing nitrogen and sulfur, coating by adopting a spray coating method, and then carrying out carbonization treatment; the carbon precursor containing nitrogen and sulfur is composed of asphalt and thiourea; the carbonization temperature is 750-850 DEG C, the carbonization time is 1-2 hours, and the heating procedure comprises a desolventizing section, an asphalt decomposition section and a carbonization section. The preparation method is low in raw material cost, low in energy consumption, environment-friendly and excellent in product comprehensive performance, and has wide application prospects in the fields of power batteries, energy storage, catalysis and the like.

The invention belongs to the technical field of drug synthesis, and relates to a dotenorad synthesis method, which comprises: weighing 100 g of a compound 1 as a raw material, and carrying out a substitution reaction with dimethyl sulfate to obtain a compound 2; taking the compound 2 as a raw material, and carrying out esterification reaction with methanol under an acidic condition; taking the compound 3 as a raw material, and obtaining a compound 4 after chlorination; hydrolyzing the compound 4 serving as a raw material to obtain a compound A; reacting the compound 5 serving as a raw material with a formaldehyde aqueous solution to obtain a compound 6; taking the compound 6 as a raw material, and performing thioether oxidation to obtain a compound B; taking a compound A as a raw material, and carrying out amide condensation reaction with a compound B to obtain a compound C; and 6, demethylating the compound C serving as a raw material under the action of lithium chloride to obtain a compound D, namely the final product dotenorad. According to the synthesis method of dotenorad, oxidation after condensation is not needed, generation of by-products is avoided, raw materials are low in cost and easy to obtain, and the synthesis method is suitable for industrial production.

The invention discloses a synthesis method of lithium phosphorus sulfur chloride, and relates to the technical field of preparation of sulfide solid electrolyte for all-solid-state lithium ion batteries, and the scheme is as follows: the synthesis method of lithium phosphorus sulfur chloride comprises the following steps: pretreatment of raw materials: mixing lithium carbonate (Li2CO3), phosphorus pentasulfide (P2S5), lithium chloride (LiCl) and elemental sulfur (S) according to a preset ratio, and then adding a catalyst, grinding and dispersing for a preset time to obtain uniformly dispersed mixed powder; reduction reaction: fully mixing the mixed powder with a reducing agent, heating to a first preset temperature condition, and carrying out reduction reaction to obtain a reduction product; sintering and purifying: heating the reduction product to a second preset temperature, and sintering to form a lithium phosphorus sulfur chloride (Li6PS5Cl) crystal phase to obtain a lithium phosphorus sulfur chloride (Li6PS5Cl) product; the raw material cost can be remarkably reduced, the process safety and economy are optimized, and large-scale industrial preparation of lithium phosphorus sulfur chlorine is realized.

The present invention provides a method for recovering lithium and iron phosphate from waste lithium iron phosphate. The method comprises: providing a crude lithium iron phosphate residue; formulating the crude lithium iron phosphate residue into a slurry, and introducing Cl2 gas into the slurry, while adding FeCl3 as a catalyst, to carry out a catalytic oxidation lithium extraction reaction; filtering the reacted slurry to obtain a lithium-containing filtrate and a crude iron phosphate filter residue; crystallizing lithium chloride from the lithium-containing filtrate to obtain purified lithium chloride; subjecting the crude iron phosphate filter residue to acid leaching, followed by filtration to obtain an iron phosphate precursor; and calcining the iron phosphate precursor to obtain iron phosphate. The method of the present invention enables full-element recovery of lithium iron phosphate from waste lithium iron phosphate, and can improve the energy utilization rate.

The invention discloses a method for preparing high-purity lithium sulfide based on a solution double decomposition method, and belongs to the technical field of battery materials, and the method comprises the following steps: adding lithium chloride and sodium sulfide into ethanol, mixing, and reacting in the mixing process to generate lithium sulfide; performing solid-liquid separation on the reaction system to obtain a solid product; washing the solid product with tetrahydrofuran and drying; and continuously introducing inert gas into the heat treatment chamber to purge a solid product in the heat treatment chamber, carrying out heat treatment on the solid product under the conditions of 200-300 DEG C and 10-1000 Pa, and removing complex impurities in the solid product to obtain the high-purity lithium sulfide. Compared with the prior art, the method has the advantages that the Li2S.EtOH impurity in the lithium sulfide is removed, the lithium carbonate impurity generated by the reaction of the impurity at high temperature is reduced, and the risk of electrolyte and battery performance is further reduced.

The invention relates to the technical field of drying agents, in particular to a porous composite gel drying agent and a preparation method thereof. Conventional desiccants are difficult to give consideration to both stable chemical properties and high moisture absorption capacity. In order to solve the problems, the porous composite gel drying agent is provided, lithium chloride, calcium chloride and other hygroscopic salts are introduced to serve as additives in a porous polymerization network of the drying agent and are compounded with the polymer network, and the intrinsic moisture absorption capacity of the material is remarkably improved. The moisture absorption capacity of the obtained porous composite gel drying agent is far higher than that of traditional silica gel, the long-acting moisture absorption requirement in the high-humidity environment can be met, and the porous composite gel drying agent is particularly suitable for the high-end fields of precision electronics, new energy batteries, biological agents and the like with strict requirements for humidity control precision.

The invention provides a process for preparing high-purity lithium sulfide through layer interface induction strengthening, which comprises the following steps: dissolving lithium chloride and sodium sulfide in N-methyl pyrrolidone, and stirring to form uniform slurry; pumping the obtained slurry into a fixed bed reactor filled with a molybdenum disulfide catalyst layered module, and reacting to obtain turbid liquid; performing temperature-controlled crystallization on the turbid liquid, filtering and separating to obtain sodium chloride crystals; performing reduced pressure distillation on the filtrate to obtain a lithium sulfide crude product; and dissolving the lithium sulfide crude product in absolute ethyl alcohol for washing, and carrying out suction filtration and drying to obtain lithium sulfide. According to the method disclosed by the invention, fixed bed catalytic reaction and programmed cooling crystallization separation are integrated, and process parameters are optimized, so that the core pain points of high energy consumption, poor safety, difficulty in separation, easiness in catalyst deactivation and the like in a traditional method are successfully solved; a green closed loop of the whole process flow is realized, and a reliable technical path is provided for industrial production of the high-performance lithium sulfide material.

The present invention relates to an apparatus for manufacturing lithium chloride and a method for manufacturing the same, and the apparatus for manufacturing lithium chloride includes: a hopper for supplying a lithium compound and a reducing agent; a selective chlorinator connected to a lower part of the hopper to receive chloride and induce a chlorination reaction; and an extractor connected to the top of the selective chlorinator to extract lithium chloride produced by the chlorination reaction, wherein the amount of residual Li in the lithium compound can be 15 wt% or less.

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 invention provides an electrolyte composition, an electrochemical in-situ etching method of non-metallic inclusions for heavy rail steel and application of the electrochemical in-situ etching method. The electrolyte composition comprises the following components in parts by weight: 1.6 to 2.3 parts of lithium chloride, 10 to 13.5 parts of acetylacetone, 45 to 84 parts of methanol and 2 to 43 parts of a reagent A, the reagent A is a mixed aqueous solution of ethylenediamine tetraacetic acid and sodium citrate. The lithium chloride, the acetylacetone, the methanol and the reagent A in specific parts are matched for use, the obtained electrolyte composition is used for in-situ electrochemical etching of the heavy rail steel, and three-dimensional in-situ etching of the non-metallic inclusions in the heavy rail steel can be successfully achieved. The in-situ information of the non-metallic inclusions in the hypereutectoid heavy rail steel is reserved, and the three-dimensional morphology of the non-metallic inclusions can be presented more comprehensively.

The invention provides spodumene impurity residue removal lithium extraction equipment and a lithium chloride and magnesium oxide preparation process, and relates to the technical field of solid waste treatment, the spodumene impurity residue removal lithium extraction equipment comprises a water bath extraction box, a first mounting plate, a second mounting plate, a reciprocating mechanism and a stirring mechanism; a first mounting plate and a second mounting plate are respectively mounted at the top of the water bath extraction box, the reciprocating mechanism comprises a motor mounted at the top of the first mounting plate, an output shaft key slot of the motor is connected with a turntable, and a limiting frame is fixedly arranged at the bottom of the first mounting plate. According to the scheme, the reciprocating mechanism is matched with the stirring mechanism to rotate in a reciprocating manner, so that the lithium dissolution and separation rate can be increased, a local dead zone formed by single stirring can be broken through the compound motion of reciprocating rotation and stirring, a lithium-containing filtrate forms a strong turbulence and shear effect in the water bath extraction box, updating of a surface leaching agent can be accelerated, and the extraction efficiency is improved. The diffusion resistance of lithium ions on a solid-liquid interface is reduced, so that the dissolution rate of lithium from a solid state to a solution is remarkably increased, and the overall extraction period is shortened.

The present application relates to the field of aluminum hydroxide-based lithium adsorbent, and discloses a cleaning agent composition, a cleaning agent and a regeneration method of aluminum hydroxide-based lithium adsorbent. The cleaning agent composition of the present application contains an aluminum flocculant, an ammonium salt, lithium chloride, a citrate, an acid and an emulsifier. The cleaning agent of the present application ensures the cleaning effect, and the adsorption performance of the cleaned adsorbent can be restored to more than 96% of the original adsorption capacity, and the adsorbent has no obvious solution loss.

The application relates to the technical field of high polymer materials, in particular to ammonia-removing and humidity-controlling water gel as well as a preparation method and application thereof, which comprises the following raw materials: deionized water, AM, MBA, Gly, lithium chloride, 2-hydroxy-2-methyl propiophenone, magnesium chloride or magnesium oxide; the AM and the MBA are added into the deionized water, and polymerization is initiated by 2-hydroxy-2-methyl propiophenone and ultraviolet light to form a polyacrylamide network, so that the novel water gel can stably control humidity and effectively remove ammonia in long-term storage, effectively adsorb ammonia and provide molecular-level water molecules, and the required humidity of a cigar is maintained; secondly, the MBA is added into the water gel to form a more stable and porous three-dimensional crosslinking network, which can not only adjust the moisture absorption / relaxation rate of the water gel, realize humidity buffering, but also adsorb ammonia molecules through acid-base neutralization, ion exchange, hydrogen bonding, electrostatic interaction, so that the water gel can maintain the required humidity of the cigar for a long time and reduce the volatilization of ammonia.

The present application relates to a kind of method and device for producing lithium chloride using dust and lithium ore, belong to dust and sludge treatment and lithium ore lithium extraction technical field of steel enterprise.The method comprises the following steps: after lithium ore is ground, mixed sintering machine head dust and binder are added, and after adjusting the moisture content of mixed material, the mixed material is pressed ball or disc balling, the green ball is dried and then roasted, zinc, lead, lithium, potassium, rubidium, cesium in the mixture are converted into gaseous chlorides or oxides, and then collected and separated to obtain zinc, lead, lithium and other compound products.The device includes mixer, balling machine, dryer, reduction roaster and dust collector in sequence along the material transport direction.Dust is difficult to use in steel plant, and the alkali metals, zinc, lead and other elements contained therein can adversely affect blast furnace smelting, but these elements are exactly the necessary raw materials for lithium chloride extraction from lithium ore.The present application can extract and separate lithium from lithium ore, and also can simultaneously treat dust and sludge solid waste that cannot be digested and treated in steel plant.

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 application discloses a preparation method of PPTA nanometer microsphere styrene butadiene rubber composite material, which comprises the following steps: 1) styrene butadiene rubber is added into a mixed solvent of cyclohexanone and N-methyl pyrrolidone, and heated and stirred until the styrene butadiene rubber is completely dissolved to obtain a transparent solution; 2) part of the transparent solution is taken, p-phenylenediamine and lithium chloride are added, and stirring is uniformly carried out to obtain solution A; p-phenylenediamine chloride is added into the remaining transparent solution, and stirring is uniformly carried out to obtain solution B; under the condition of nitrogen atmosphere and ice water bath, solution B is slowly dropped into solution A, and stirring reaction is carried out at room temperature to obtain a light brown solution; 3) deionized water is added into the light brown solution, and after stirring, filtration and washing, and drying, the PPTA nanometer microsphere styrene butadiene rubber composite material is obtained. The in-situ solution condensation method and the bottom-up method are combined to synthesize the PPTA nanometer particles which are uniformly dispersed in the rubber matrix, and the surface effect, the quantum size effect and the macroscopic quantum tunnel effect endow the composite material with high strength, high toughness, high impact resistance and other performances.

The invention discloses a preparation method of sodium-mediated lithium sulfide, which specifically comprises the following steps: preparing a sodium ethoxide solution, and dissolving a product obtained after reaction of ethanol and sodium in an organic solvent; adding lithium chloride into the solution for mixing reaction, and centrifuging to obtain a lithium ethoxide solution; introducing hydrogen sulfide gas into the solution, collecting a precipitation product, and calcining to obtain lithium sulfide. The lithium sulfide preparation conditions are mild, the reaction conditions are simple, and the product is easy to collect. The preparation raw materials provided by the invention are metal sodium, ethanol, lithium salt and hydrogen sulfide gas, so that the reaction cost is greatly reduced, commercialization feasibility is realized, and a method for recycling industrial waste gas hydrogen sulfide gas is provided and has certain environmental protection value.