253 results about "Lithium sulphate" patented technology

The invention discloses high-purity lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the step that lithium hydride, lithium hydroxide and a sulfur source are subjected to a heating reaction in a dry inert atmosphere, and the high-purity lithium sulfide is obtained. The molar ratio of lithium hydride to lithium hydroxide is X: (10-X), and X is 1-6. The invention also discloses the prepared high-purity lithium sulfide and application of the high-purity lithium sulfide in preparation of sulfide solid electrolyte. Lithium hydroxide and lithium hydride are mixed to serve as a lithium source in lithium sulfide preparation, the lithium hydroxide quickly and uniformly reaches the reaction temperature by means of the characteristic that the lithium hydride reacts with a sulfur source to release heat and produce gas, the lithium hydride reacts to produce gas, meanwhile, discharging of product water vapor is facilitated, and oxygen in the environment is isolated; and hardening and generation of a side reaction product lithium sulfate are prevented, the conversion rate of lithium hydroxide to lithium sulfide is improved, and the raw material and process cost for preparing lithium sulfide is remarkably reduced.

The invention discloses a large-scale preparation method of lithium sulfide, and belongs to the technical field of preparation of battery materials. Lithium sulfate monohydrate is adopted as a reaction raw material and is subjected to dehydration and purification treatment to obtain anhydrous lithium sulfate, and the anhydrous lithium sulfate is calcined in hydrogen and carbon dioxide mixed gas without introducing other impurities; the method has the advantages that safety under high-temperature calcination reaction can be guaranteed, the produced lithium sulfide crude product is dissolved by the methanol / isopropanol mixed solution to directly generate lithium sulfide crystals, redundant impurities can be removed by calcining the generated lithium sulfide crystals, no other by-products are generated in the reaction process, and the purity of lithium sulfide is guaranteed. According to the Li2S preparation method developed by increasing the purification step and exploring the reaction conditions and the impurity removal mode, low-cost, high-purity and large-scale preparation of Li2S can be realized.

The invention relates to the technical field of preparation of lithium sulfide, in particular to a method for preparing lithium sulfide through hydrogen reduction of lithium sulfate. According to the specific technical scheme, the method for preparing the lithium sulfide by reducing the lithium sulfate through the hydrogen comprises the steps that the lithium sulfate is smashed to be micron-sized and then fed into a fluidized bed reactor, then high-purity hydrogen preheated to 850 DEG C is introduced into the fluidized bed reactor from the bottom of the fluidized bed reactor, the reaction temperature is controlled to be 850 + / -20 DEG C, and the reaction time is controlled to be 5-10 min. The hydrogen reduction method is relatively low in reaction temperature (700-900 DEG C), hydrogen is used as a clean reducing agent, a reaction byproduct is only water, and the problems of insufficient purity, high energy consumption, serious environmental pollution and the like in a traditional lithium sulfide preparation method can be avoided. The introduction of the fluidized bed technology can greatly enhance the gas-solid phase heat and mass transfer efficiency, realizes the continuity and automation of the process, and is an important path for realizing the industrialization of the reaction.

The invention relates to the technical field of battery raw materials, in particular to a preparation method of lithium sulfide powder, the lithium sulfide powder and application, and the preparation method comprises the following steps: uniformly mixing lithium sulfate and a carbon source according to a preset proportion to obtain a first mixture; performing first heat treatment on the first mixture in inert gas to obtain a second mixture; and performing second heat treatment on the second mixture in reducing gas to obtain the lithium sulfide powder. The product obtained by the preparation method disclosed by the invention is the lithium sulfide powder, and the obtained lithium sulfide powder has the advantages of less oxygen and carbon impurities, higher purity and high reaction activity, and meets the synthesis requirements of the electrolyte; according to the preparation method, in the process of preparing lithium sulfide, toxic gas and organic solvent are not used, the reaction temperature is low, the energy consumption is low, the requirement on production equipment is low, the process is simple, the cost is low, harmful gas emission is avoided, safety and environment friendliness are achieved, and industrialization is easy to achieve.

The application discloses a method for preparing high-purity battery-grade lithium sulfide by reducing lithium sulfate with a reducing gas. The specific steps are as follows: raw material lithium sulfate and inert wave-absorbing substances are mixed, uniformly mechanically ball-milled, tablet-pressed, sieved, put into a microwave reactor, and then a reducing gas is introduced for microwave heating reaction; after cooling to room temperature, the mixture is discharged into another reactor, ethanol is added for dissolution, mechanical stirring is carried out, and then standing and filtration are performed; the inert wave-absorbing substances are recycled and reused; an ethanol solution of dissolved lithium sulfide is obtained; crude lithium sulfide is obtained by heating and distillation; after freeze-drying, the crude lithium sulfide is heated and secondarily calcined in a rotary furnace under the protection of inert gas, and finally battery-grade high-purity lithium sulfide is obtained. By mixing the inert wave-absorbing substances with the lithium sulfate and heating by the microwave method, the contact surface of the lithium sulfate and the gas can be improved, and in addition, the internal heating method can be used to avoid the lithium sulfide formed on the outer surface from wrapping the raw material lithium sulfate, so as to affect the hydrogen reduction efficiency.

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 discloses electronic-grade lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing lithium sulfate with hydrogen under a vacuum condition, and carrying out a reduction reaction to prepare the electronic-grade lithium sulfide. According to the preparation method of the electronic-grade lithium sulfide, lithium sulfate is reduced through hydrogen, no waste gas or waste water is generated in the process, environment friendliness is achieved, unreacted hydrogen and water vapor return to the hydrogen storage tank, hydrogen can be reused, the water vapor settles to the bottom of the tank to be recycled after being condensed, the technological process is short, and the product purity is high; the method is suitable for large-scale popularization and application.

The invention discloses a process for extracting lithium from lepidolite through low-temperature roasting, which comprises the following steps: uniformly mixing lepidolite mineral powder with ferrous sulfate, sodium sulfate and calcium oxide, roasting at 800-900 DEG C for 1-2 hours, and cooling to room temperature to obtain a roasted material; adding water into the roasted material to prepare slurry, performing wet grinding to obtain ball-milled slurry, performing water leaching on the slurry, and performing suction filtration to obtain lithium sulfate leaching liquid and leaching residues; treating the leaching solution to obtain a lithium precipitation pre-solution, and further carrying out lithium precipitation reaction to obtain a lithium carbonate crude product; and finally, mixing the crude lithium carbonate product with deionized water, heating, stirring, washing and carrying out solid-liquid separation to obtain a battery-grade lithium carbonate product. The lithium extraction process of the lepidolite can be realized under the roasting condition of 800-900 DEG C, and the roasting temperature is effectively reduced; meanwhile, on the basis of the low-temperature roasting condition, Li2SO4 and LiKSO4 can still be extracted to the maximum extent, and release of SO2, SO3 and HF is avoided.

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

The utility model discloses a liquid-phase synthesis system of lithium sulfide. Comprising a first lithium sulfate dissolving device, a first barium sulfide dissolving device, a chemical combination reaction device, a first separation device and a second separation device, the liquid phase after-treatment unit is used for concentrating, purifying and drying the liquid phase to obtain lithium sulfide, and the solid phase after-treatment unit is used for washing and drying the solid phase to obtain barium sulfate; the first lithium sulfate dissolving device and the first barium sulfide dissolving device are both connected with a raw material inlet of the combination reaction device; and a reaction product outlet of the combination reaction device is connected with the first separation device. The liquid-phase synthesis system of the lithium sulfide has the advantages that products are easy to separate, the purity of the lithium sulfide products is high, the liquid-phase synthesis system of the lithium sulfide is very suitable for industrial-scale production, and the produced high-purity anhydrous lithium sulfide is very suitable for solid-state battery anode materials and has huge potential economic benefits.

The invention discloses a method for preparing high-purity lithium sulfide from a lithium sulfate mother liquor, which comprises the following steps: preparing a lithium sulfate concentrated liquor: adding 98% concentrated sulfuric acid into the lithium sulfate mother liquor to adjust the pH value, adjusting the pH value to 6-7, carrying out precise filtration to filter out possible impurities to obtain a filtrate, introducing the filtrate into an MVR evaporation system, and concentrating the mother liquor to obtain a concentrated liquor, performing freezing crystallization on the concentrated solution by using a cooling crystallizer, and then performing centrifugal separation under the action of a centrifugal machine to obtain solid slag which is mirabilite and a solution which is lithium sulfate concentrated solution; and preparing crude lithium sulfide: performing evaporative crystallization on the obtained lithium sulfate concentrated solution, adding pure water for slurrying, and performing centrifugal filtration and cleaning for 2-3 times. The impurity content is effectively controlled through a multi-stage purification process, the Li2S product with the purity larger than or equal to 99.95% is finally obtained, the key technical problem of direct conversion from a liquid battery recycling material to a solid battery positive electrode raw material is solved, and core material support is provided for lithium battery industry closed loop and industrial product iteration.

The invention discloses a lithium dihydrogen phosphate preparation method, which comprises: S1, mixing a refined lithium sulfate solution with an extraction agent solution, and carrying out standing layering to obtain an upper layer solution; s2, mixing the upper-layer solution with a detergent, washing, and separating to obtain a washing solution; s3, mixing the washing liquid with a phosphoric acid solution, and standing for layering to obtain a lower-layer solution; s4, mixing the lower-layer solution with a component regulator; and carrying out solid-liquid separation. An extracting agent in the extracting agent solution comprises at least one of benzoyl trifluoroacetone, trialkyl phosphine oxide and sulfonated calixarene. The specific extraction agent efficiently selects lithium ions to separate impurities, lithium dihydrogen phosphate is obtained through direct reverse extraction after washing, lithium dihydrogen phosphate does not need to be converted into other lithium products to prepare lithium dihydrogen phosphate, and the process production period is shortened. In addition, lithium dihydrogen phosphate is prepared through washing and reverse extraction after impurities are efficiently selected and separated through an extraction agent; the purity is high; the battery grade lithium dihydrogen phosphate can be obtained.

The invention discloses a quick-hardening early-strength concrete mineral additive and a preparation method thereof, and belongs to the technical field of building materials. The additive comprises the following components in parts by weight: 50-75 parts of a mineral active material (compounded by silica fume, slag powder and metakaolin), 15-30 parts of a composite activator (sodium silicate, lithium sulfate and triethanolamine synergistically), 5-10 parts of a sustained-release microcapsule (calcium sulphoaluminate coated with nano-silica) and 2-5 parts of an auxiliary thickening agent (compounded by HPMC and a water reducing agent). The preparation method comprises the steps of mineral activation, excitant reaction and mixing of the microcapsule and the thickening agent. After the additive is doped into concrete, the 3h compressive strength is greater than or equal to 15MPa, the initial setting time is less than or equal to 5min, and the additive has low resilience (less than or equal to 13%), high durability (impermeability is greater than or equal to P11) and environmental adaptability (-5 DEG C strength fluctuation ratio is less than or equal to 9%). And compared with the prior art, the cost is reduced by 40%, and the method has remarkable economic and social benefits.

The invention discloses lithium sulfide and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out ball-milling mixing on iron powder, sodium sulfide and lithium sulfate in a first inert atmosphere to obtain a mixture; (2) calcining the mixture in a second inert atmosphere for the first time to obtain a reaction material; (3) stirring and washing the reaction material with an alcohol solvent in a third inert atmosphere, filtering to obtain filtrate and a filter cake, performing reduced pressure distillation on the filtrate to obtain a lithium sulfide crude product, washing the filter cake with deionized water, and filtering to obtain a solid by-product; and (4) carrying out secondary calcination on the lithium sulfide crude product in a fourth inert atmosphere to obtain lithium sulfide. The preparation method provided by the invention has the advantages of few synthesis steps, simple product purification and environmental protection.

The invention belongs to the technical field of medical treatment, and relates to a nucleic acid releasing agent which comprises the following components: acetonitrile, strong base, lithium dodecyl sulfate, potassium trifluoromethanesulfonate, ammonium sulfate, dimethyl sulfoxide and thiourea. The invention also relates to a microfluidic device and a detection method thereof. According to the technical scheme provided by the invention, the inhibition effect of protein on nucleic acid can be destroyed, and the inhibitor is effectively removed and amplified.

The invention discloses a method for preparing battery-grade lithium phosphate based on fractional precipitation and double washing and application, according to the method, crude lithium sulfate is used as a raw material, and through an integrated process of fractional precipitation and double washing, the production cost of the lithium phosphate is reduced, and meanwhile, the yield of the battery-grade lithium phosphate is increased. The method mainly solves the problem of wrapping sodium ions and sulfate radicals as impurities in the process of precipitating crude lithium sulfate, and is suitable for industrial production of the precursor of the positive electrode material of the lithium ion battery. According to the method, the impurity content is mainly controlled from two aspects, wrapping of impurities in product grains can be reduced through fractional precipitation and crystal form induction generation, and residual impurities in grain gaps can be removed through a dual washing scheme. The purpose of crystal form induction generation is mainly to guide generation of large crystals and reduce the specific surface area of the large crystals so as to reduce the Na adsorption amount.

The invention is suitable for the technical field of grouting materials, and provides a grouting material with high durability and good bonding performance and a preparation method. Comprising the following components: 20 to 30 parts of Portland cement, 30 to 45 parts of sulphoaluminate cement, 0.5 to 2 parts of an early strength agent, 15 to 25 parts of fly ash, 5 to 10 parts of silicon dioxide, 0.5 to 1 part of soybean oil, 0.5 to 1 part of vegetable tannin, 1 to 2 parts of a water reducing agent, 0.2 to 0.5 part of fish gelatin, 0.05 to 0.15 part of a retarder and 0.05 to 0.1 part of an air entraining agent. Preferably, the grouting material further comprises blast furnace slag and wood pulp fibers, the mass fraction of the blast furnace slag is 10 to 20 parts, and the mass fraction of the wood pulp fibers is 0.1 to 0.5 part; the mass ratio of the Portland cement to the sulphoaluminate cement is 2: 3, and the early strength agent is one or more of lithium sulfate and lithium carbonate. The durability and binding property of the grouting material are remarkably improved, and the crack resistance, flexibility and constructability of the grouting material are enhanced, so that the grouting material can better adapt to complex and changeable construction environments and long-term load effects and has wide application prospects.

The invention discloses a method for directly preparing high-purity Li2S by utilizing carbothermal reduction, which comprises the following steps: ball-milling and mixing Li2SO4.H2O and a carbon source, and carrying out first-step calcination in an air atmosphere at the calcination temperature of 450-550 DEG C to obtain a first-step calcination product; carrying out ball-milling mixing on the first-step calcined product and sublimed sulfur powder, tabletting, and carrying out second-step calcination at the calcination temperature of 700-800 DEG C under the protection of inert gas to obtain a second-step calcined product; and continuously performing third-step calcination on the second-step calcination product under the protection of inert gas at the calcination temperature of 850-950 DEG C to obtain the product Li2S. Lithium sulfate and a high-purity carbon source are adopted as main raw materials, sublimed sulfur powder is introduced in the second-step calcination process to inhibit generation of Li2O, after the carbon source is consumed in the second-step calcination process, a mixture of lithium sulfide and residual lithium sulfate is obtained, the temperature continues to rise, third-step calcination is conducted, the residual lithium sulfate is molten, volatilized and removed, and the lithium sulfide is obtained. And discharging the mixture out of the tubular furnace along with the gas flow of the inert gas to obtain high-purity lithium sulfide.

The invention discloses a preparation method of high-purity lithium sulfide based on a carbon reduction method, and belongs to the technical field of material preparation. Comprising the following steps: S1, mixing anhydrous lithium sulfate with a reducing agent, and adding absolute ethyl alcohol as a solvent, S2, drying a material subjected to wet grinding, removing the absolute ethyl alcohol solvent and water, and transferring the material into a tubular furnace or an atmosphere sintering furnace to obtain a dried material; s3, the environment temperature in the furnace is increased to 600-800 DEG C at the heating rate of 5-12 DEG C / min, heat preservation is conducted for 30-60 min, and a reduction reaction is conducted; s4, after a reduction reaction product is cooled to the room temperature, adding absolute ethyl alcohol, stirring until the absolute ethyl alcohol is fully dissolved, completing solid-liquid separation through a suction filtration device, collecting filtrate and distilling; and S5, drying the distilled product to obtain the high-purity lithium sulfide. By accurately controlling the raw material purity, the reaction parameters and the purification process, the product purity is greater than or equal to 99.5%, the yield is greater than or equal to 89%, and the high-performance application requirements of solid-state batteries and the like are completely met; the method is simple in process steps, moderate in equipment requirements and suitable for large-scale industrial production.

The invention discloses a method for preparing high-purity lithium sulfide by recycling a waste lithium ion battery positive electrode material. The method comprises the following steps: selectively leaching lithium from lithium manganate, lithium iron phosphate and a waste ternary positive electrode material; the lithium-rich lixivium is subjected to precipitation, purification and impurity removal, and a high-purity lithium sulfate refined solution is obtained; drying the high-purity lithium sulfate refined liquid to obtain anhydrous lithium sulfate; mixing and ball-milling anhydrous lithium sulfate and carbon powder to obtain a first precursor; carrying out high-temperature calcination on the first precursor in an inert gas atmosphere to obtain a second lithium sulfide precursor; dissolving, evaporating and crystallizing the second precursor to obtain a lithium sulfide intermediate; and crushing the lithium sulfide intermediate, and carrying out secondary sintering to obtain the high-purity lithium sulfide. The preparation method is simple, lithium is selectively extracted from the positive electrode material of the waste lithium ion battery, the loss of lithium ions is reduced, the preparation cost of lithium sulfate is reduced by adopting the high-purity lithium sulfate filtrate, the method is simple in process, and the purity of the obtained lithium sulfide can reach 99.5% or above.

The invention belongs to the technical field of secondary battery material regeneration. The invention relates to lithium iron phosphate batteries, in particular to a method for regenerating waste lithium iron phosphate batteries by combining spontaneous reaction. The regeneration method comprises the following specific regeneration steps: carrying out ball milling on the recycled lithium iron phosphate positive electrode material to obtain powder with the sphericity degree of 0.8-0.9 and D50 of 1-2.5 [mu] m; ultrasonically dispersing the powder in a dopamine solution, adding a lithium sulfate solution, carrying out microwave ultrasonic reaction, adjusting the pH value to 7.6-7.8, continuing the microwave ultrasonic reaction, filtering, washing and drying to obtain a dried filter cake; and placing the dried filter cake in an inert atmosphere, carrying out heat preservation calcination for 3-5 hours at the temperature of 600-800 DEG C, cooling, discharging, and scattering to obtain the regenerated lithium iron phosphate positive electrode material. Wherein the dopamine solution further comprises a water-soluble aluminum salt accounting for 3-5% of the mass of the dopamine solution and microcrystalline cellulose accounting for 3-5% of the mass of the dopamine solution.

The invention provides a method for preparing a silicon borate coated and modified sodium battery positive electrode material by using a waste ternary positive electrode material, and belongs to the technical field of lithium ion battery material recovery. The method mainly comprises the following steps: step 1, carrying out ball-milling mixing on waste positive electrode powder and a certain proportion of sulfate, and then roasting to generate a precursor with a trace amount of lithium; 2, the composite material is subjected to water leaching lithium extraction, and a lithium sulfate solution and leaching residues are obtained; and step 3, drying the leaching residues, mixing a sodium source, a manganese source and silicon borate, and calcining in a muffle furnace to generate the sodium ion positive electrode material with excellent performance. The invention aims to provide a method which is short in technological process and capable of effectively repairing the structural damage of the waste lithium ion ternary material and improving the performance, that is, the high-performance layered sodium ion positive electrode material is prepared through silicon borate coating.

The invention belongs to the technical field of building materials, and provides an early-strength cement-based grouting material and a preparation method thereof.The early-strength cement-based grouting material is prepared from, by weight, 500-600 parts of sulphoaluminate cement, 200-300 parts of Portland cement, 40-100 parts of lithium slag, 1-3 parts of a coagulant, 0.5-1 part of an early strength agent, 5-8 parts of a water reducing agent, 0.5-2.5 parts of a thickening agent, 0.3-0.9 part of a defoaming agent and 260-310 parts of water; the coagulant is sodium metaaluminate and / or potassium metaaluminate; the early strength agent is selected from one or more than two of lithium carbonate, lithium sulfate, calcium formate, calcium acetate, calcium propionate, calcium butyrate and nano silicon dioxide. According to the technical scheme, the problems of poor dispersion resistance and low early strength of a cement-based grouting material in a flowing water environment in the prior art are solved.

The utility model relates to the technical field of coating devices, and discloses separation equipment for lithium sulfate solution production, which comprises a separation equipment body and a feed port fixedly connected to the top of the separation equipment body, and further comprises a discharge pipe fixedly connected to the bottom of the separation equipment body, a control chamber is fixedly connected to the bottom of the reaction chamber and communicates with the feeding port, a sealing plate is fixedly connected to the interior of the control chamber, and a quantity control mechanism is further arranged in the separation equipment body. Through the arrangement of the reaction chamber, the control chamber and the sealing plate, the effect of conveniently controlling the quantity of a lithium sulfate solution by a worker is achieved, the subsequent separation effect is improved, and the problem that in the using process of existing separation equipment, the lithium sulfate solution is often directly poured into a separation net at a time, and the separation efficiency is affected is solved. And the problem that the separation effect is poor due to the fact that too much liquid is poured at a time is possibly solved.

A method for producing lithium sulfide according to the present invention is characterized by having a raw material mixing step (S1) in which lithium sulfate and a carbon material are mixed to form a mixed raw material, and a thermal reduction step (S2) in which the mixed raw material is heat-treated in a non-oxidizing atmosphere and the lithium sulfate is thermally reduced to generate lithium sulfide, the method also being characterized in that a carbon powder having a specific surface area measured by the BET method of 55 m2 / g or greater is used as the carbon material. A method for producing a sulfide-based solid electrolyte according to the present invention is characterized in that lithium sulfide produced through the method for producing lithium sulfide according to the present invention is used as a raw material.

The utility model discloses an evaporation and concentration system suitable for lithium sulfate purification, which is characterized in that an outlet of a raw material tank is sequentially connected with a cold side of a condensate water preheater and a cold side of a non-condensable steam preheater through an outlet of a feeding pump, and then is connected with a tube pass inlet of a heater together with an outlet pipeline of a material circulating pump; a tube pass outlet of the heater is connected with a material inlet of the integrated separator, and a material outlet of the separator is connected with an inlet of the material circulating pump; a secondary steam outlet of the integrated separator is connected with an inlet of a steam compressor through a scrubber tower, and a compressed steam pipe is connected with a shell pass steam inlet of a heater; a shell pass condensed water outlet of the heater is connected with an inlet of a condensed water tank; an outlet of the condensed water tank is connected with a hot side of the condensed water preheater through a condensed water pump; a shell pass extraction opening of the heater is connected with the hot side of the non-condensable steam preheater through a non-condensable gas conveying pipe, and a hot side outlet of the condenser is connected with a vacuumizing system. The system is high in evaporation efficiency and low in operation cost and equipment investment.

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 high-temperature phase change regulation and control anhydrite-based self-leveling mortar and a preparation method thereof. The self-leveling mortar is prepared from Portland cement, sulfur aluminum cement, modified fine sand, modified coarse sand, modified heavy calcium carbonate, ash calcium, anhydrite, cellulose, a water reducing agent, a defoaming agent, rubber powder and lithium sulfate. The preparation method comprises the following steps: S1, carrying out solid phase change on calcined phosphogypsum to prepare anhydrous gypsum, S2, preparing modified fine sand and modified coarse sand, S3, preparing modified coarse calcium carbonate, and S4, mixing all the components to obtain the anhydrous gypsum-based self-leveling mortar. Through the synergistic effect of all the raw materials, the modified fine sand, the modified coarse sand and the modified coarse calcium carbonate form a tight filling structure, the structural strength of the dried mortar is enhanced, in the alkaline environment of the self-leveling mortar, polyethylene glycol monomethyl ether on the surface of the modified coarse calcium carbonate reacts with silane coupling agents on the surfaces of the modified fine sand and the modified coarse sand to form a cross-linked structure, and the self-leveling mortar has the advantages that the self-leveling effect is good; the structural strength and the stability of the self-leveling mortar are further improved.

The invention discloses a lead-lithium battery negative electrode material composite formula and a processing technology, and belongs to the technical field of lead-lithium batteries, the lead-lithium battery negative electrode material composite formula comprises the following components by weight: 80-90 parts of a high-entropy lead powder composite material, 2-5 parts of a novel composite expanding agent, 1-3 parts of a conductive reinforcing agent, 5-8 parts of a lithium sulfate-MOF electrolyte with a concentration of 0.5-1.5 mol / L, and 3-6 parts of a binder, the negative electrode material has the advantages of being capable of effectively dispersing the additive and avoiding overgrowth of lead sulfate crystals, and the problems that an existing negative electrode material composite formula of the lead-lithium battery cannot avoid overgrowth of the lead sulfate crystals and an existing processing technology cannot ensure uniform dispersion of the additive, and then the discharge performance and the overall service life of the lead-lithium battery are affected are solved.

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.