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Method for removing and recycling fluorine ions by promoting calcium fluoride precipitation through sulfate doping
PendingCN120441109ACrystallization separationWater contaminantsEnvironmental engineeringSodium fluoride
The invention relates to the technical field of environmental science and engineering, and discloses a method for removing and recycling fluorine ions by promoting calcium fluoride precipitation through sulfate doping, and the method comprises the following steps: S1, preparing sodium fluoride solutions of sulfate with different concentrations, and analyzing the influence of different sulfate concentrations on calcium fluoride precipitation; s2, respectively adding calcium chloride solutions into the prepared sodium fluoride solutions of the sulfates with different concentrations; s3, the two solutions are subjected to a reaction within a set time, filtering is conducted after the reaction is conducted for a period of time, and the fluorine ion removal reaction is completed. By changing the concentration of sulfate in the sodium fluoride solution, the effect of the sulfate in calcium fluoride precipitation and the influence of the sulfate on the fluorine ion removal efficiency are researched; the positive effect and the action mechanism of the low-concentration sulfate in the calcium fluoride precipitation process are defined, and the problems that the influence of the sulfate in the high-fluoride wastewater on calcium fluoride precipitation is ignored, the calcium fluoride purity is low and the recovery difficulty is large are finally solved.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY
Mitigation of contamination of lithium selective media in a direct lithium extraction process
PendingUS20250250653A1Water treatment parameter controlSolvent extractionPhysical chemistryAnalytical chemistry
There is disclosed a method for treatment of an aqueous lithium salt-containing solution in a direct lithium extraction process comprising lithium-selective media, wherein the aqueous lithium salt-containing solution comprises one or more foulants, the method comprising the steps of adjusting the oxidative-reductive potential and / or pH of the aqueous lithium salt-containing solution to render the one or more foulants inert to the lithium-selective media; and removing the one or more inert foulants from the aqueous lithium salt-containing solution prior to addition of the aqueous lithium salt-containing solution to the lithium-selective media in a direct lithium extraction process.
Owner:AQUATECH INT LLC
Methods of recycling polystyrene material comprising brominated contaminants
ActiveUS20250236713A1Solvent extractionCrystallization separationPolystyreneEnvironmental engineering
The present disclosure relates to methods of removing brominated contaminants from polystyrene waste and recovering the brominated contaminants. The present disclosure further relates to methods of recycling polystyrene waste, wherein the recycling comprises retention of brominated contaminants or removal of contaminants. The present disclosure also relates to use of monocyclic aromatic benzenic solvents in the removal and / or recovery of brominated contaminants from polystyrene waste and in the recycling of polystyrene waste. Moreover, the present disclosure relates to use of the recovered brominated contaminants in the manufacture of polystyrene products such as insulation.
Owner:POLYSTYVERT
Recovery of critical elements from end-of-life lithium ion batteries with supported membrane solvent extraction
Single-stage and multi-stage systems and methods for the recovery of critical elements in substantially pure form from lithium ion batteries are provided. The systems and methods include supported membrane solvent extraction using an immobilized organic phase within the pores of permeable hollow fibers. The permeable hollow fibers are contacted by a feed solution on one side, and a strip solution on another side, to provide the simultaneous extraction and stripping of elements from dissolved lithium ion cathode materials, while rejecting other elements from the feed solution. The single- and multi-stage systems and methods can selectively recover cobalt, manganese, nickel, lithium, aluminum and other elements from spent battery cathodes and are not limited by equilibrium constraints as compared to traditional solvent extraction processes.
Owner:UT BATTELLE LLC
Method and system for separating and recovering phosphorus and iron in phosphorus-containing iron compound
The invention discloses a method and a system for separating and recovering phosphorus and iron in a phosphorus-containing iron compound, and relates to the technical field of solid waste utilization. The method comprises the following steps: obtaining a crushed phosphorus-containing iron compound and a solid alkaline substance; the crushed ferrophosphorus-containing compound and the crushed solid alkaline substance are taken and placed in a reaction furnace, the ferrophosphorus-containing compound and the solid alkaline substance are fused and react to obtain a first mixed material, and the dosage of the solid alkaline substance is 1-1.2 times of the theoretical molar dosage; adding water into the first mixed material for leaching to obtain a first solid-liquid mixture, and performing solid-liquid separation on the first solid-liquid mixture to obtain a first filter cake and first filtrate; washing and drying the first filter cake to obtain a ferric oxide product; evaporating, concentrating, crystallizing and drying the first filtrate to obtain a phosphate finished product. The method provided by the invention has the advantages of environmental protection and high product quality.
Owner:SICHUAN JINHENGFENGLING NEW MATERIAL TECHNOLOGY CO LTD
Process for recovering brine from a desalination plant.
The present invention relates to a process for producing salts from brine obtained from the desalination of seawater. The process can also make it possible to selectively recover NaCl, CaSO4, kainite, carnallite, magnesium sulfate, struvite, newberyite, or potassium bitartrate.
Owner:UNIV MOHAMMED VI POLYTECHNIQUE
Bis(fluorosulfonyl)imide salts and methods for preparing same
The present invention relates to a bis(fluorosulfonyl)imide salt and a method for preparing the same. More specifically, the present invention provides a novel salt of bis(fluorosulfonyl)imide containing 0.01 ppm to 10,000 ppm of a halogenated alcohol. The present invention further relates to a method for producing the salt of bis(fluorosulfonyl)imide, which comprises crystallizing a raw salt of bis(fluorosulfonyl)imide in a crystallization solvent containing at least a halogenated alcohol. Uses of the salt of bis(fluorosulfonyl)imide are also disclosed.
Owner:SYENSQO SA (50 00)
Production system of o-nitrobenzenesulfonyl chloride
ActiveCN116726862BOrganic compound preparationCrystallization separationNitrobenzeneWater chlorination
The application discloses a production system of o-nitrobenzenesulfonyl chloride, which comprises an etherification reaction kettle, a material transfer structure, a recrystallization pool, a separation mechanism and a chlorination reaction kettle. The material transfer structure comprises a rotary driving mechanism, a rotating disc and a charging disc. A plurality of rotating rods are fixedly connected to the rotating disc. The bottom of the charging disc is provided with a filter screen. A filtering station, a recrystallization station, a first drying station, a chlorination station, a second drying station and a discharging station are sequentially arranged around the rotating disc. The recrystallization pool is located directly below the recrystallization station. Drying boxes are respectively arranged below the first drying station and the second drying station. The chlorination reaction kettle is located directly below the chlorination station. The production system of o-nitrobenzenesulfonyl chloride realizes continuous and automatic production of o-nitrobenzenesulfonyl chloride through the arrangement of the recrystallization station and the multiple chlorination stations, guarantees the purity and yield of the product and improves the production efficiency.
Owner:SUZHOU ZECHEN TRADING CO LTD
Reduction of Chalcopyrite with an Aqueous Reducing Agent to Enable Wet Refining Extraction of Copper
Copper concentrate, such as chalcopyrite, is contacted with an aqueous solution containing an acid, and a reducing agent, such as vanadium(II) ions, chromium(II) ions, or zinc tungstoate (HZnW 12 O 40 ). The aqueous solution reduces the copper in the copper concentrate, which can then be dissolved in solution for recovery therefrom or precipitated from solution as copper compounds or elemental copper for recovery as a solid phase product. The solid phase product can then be isolated, dissolved, and further electrowinning to recover the copper product from the copper concentrate. The oxidized reducing agent can be recovered in an electrochemical device with a ferrous reactant. A hydrometallurgical route for converting copper concentrate to copper is potentially cheaper and less polluting than current high temperature smelting processes, and is an advantageous response to environmental and economic pressures for increased copper production.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
Non-contact material pre-crystallizer for granulation
The invention discloses a non-contact material pre-crystallizer for granulation, and relates to the technical field of crystallizers, the non-contact material pre-crystallizer for granulation comprises a fixed mounting base, a speed reducer plate frame is mounted above the fixed mounting base, and the right end of the speed reducer plate frame is provided with a driving gear disc capable of rotating an inner cylinder. The problems that a traditional granulation crystallizer depends on contact type mechanical operation, materials are gathered through physical acting force or by directly adding reagents, the product uniformity and the process effect can be seriously reduced in the aspects of energy consumption, efficiency and the like, material particles are prone to being mutually bonded or directly bonded in a container through contact type operation, and the production cost is high are solved. The problems that in the prior art, due to the fact that the mixing speed is different, follow-up cleaning is difficult, meanwhile, along with the different mixing speeds, the crystallization degree of material particles is different, and in the material particle input and discharge process, a conventional crystallizer can only conduct quantitative operation on materials, and continuous operation cannot be achieved are solved.
Owner:SHANGHAI CHENGYUAN PRECISION MASCH MFG CO LTD
Brackish water desalination system and method
PendingCN120903776AGeneral water supply conservationSpecific water treatment objectivesBrackish waterDesalination
The invention relates to the technical field of brackish water desalination, and discloses a brackish water desalination system and method.The system comprises a primary water treatment device, a secondary water treatment device, a freezing pond, a tertiary water treatment device and a quaternary water treatment device, the secondary water treatment device is connected with the primary water treatment device, the secondary water treatment device is suitable for separating tail water, the freezing pool is connected with the secondary water treatment device, the tertiary water treatment device is connected with the freezing pool, and the quaternary water treatment device is connected with the tertiary water treatment device. The tail water is sequentially subjected to multi-stage separation and purification of the second-stage water treatment device, the freezing pool, the third-stage water treatment device and the fourth-stage water treatment device, salt and alkali in the tail water can be separated out, tail water treatment is achieved, the final product only comprises salt, alkali and water, and the tail water treatment device has the advantages of being simple in structure and good in tail water treatment effect.
Owner:CHINA THREE GORGES CORPORATION
Method for recovering lithium bis(fluorosulfonyl)imide
A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application comprises: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.
Owner:CONTEMPORARY AMPEREX TECHNOLOGY CO LTD +1
Methods of recycling metallic ion content from inorganic solids and systems thereof
PCT designated stageWO2026015534A1CellsPhotography auxillary processesPhysical chemistryChemical engineering
Owner:X DEVELOPMENT LLC
Kettle equipment applied to triazole crystallization
ActiveCN223628124UCrystallization separationHollow article cleaningMechanical engineeringCrystallization
The utility model relates to the technical field of triazole crystallization, and discloses kettle equipment applied to triazole crystallization. The lifting support is arranged, the cross clamping strip is arranged on the rotating shaft, and the cross through hole is formed in the middle of the mounting ring, so that the position of the mounting ring is not changed in the downward moving process of the rotating shaft, and the rotating shaft synchronously drives the mounting ring to rotate in the rotating process. Through mutual cooperation of the first connecting rod, the second connecting rod, the L-shaped scraping rod, the vertical mounting plate and other parts, in the falling process of the rotating shaft, the second connecting rod can push the vertical mounting plate to turn outwards by a certain angle, so that the wall cutting part can be tightly attached to the inner wall of the reaction kettle; therefore, crystals on the inner wall of the reaction kettle can be scraped off more efficiently. The equipment is compact in structure, and has longer service life and lower equipment failure rate compared with the mode that a spring is tightly attached to the inner wall of the reaction kettle.
Owner:NINGXIA SURONGDA CHEM CO LTD
High-salinity wastewater salt recovery and wastewater reuse device
ActiveCN223804915UFatty/oily/floating substances removal devicesCrystallization separationOil and greaseOil separation
A high-salinity wastewater salt recovery and wastewater reuse device comprises a separation tank and a drying assembly, three sets of supporting columns are fixedly installed on the outer side of the separation tank, the drying assembly is installed among the three sets of supporting columns, an oil extraction mechanism is installed in the separation tank, a scraping mechanism is installed in the separation tank, and the oil extraction mechanism is connected with the scraping mechanism. And the scraping mechanism comprises a gear ring, the gear ring is rotationally connected to the interior of the separation tank, and the lower end of the gear ring is fixedly connected with two sets of scraping plates. By arranging the oil extraction mechanism and utilizing the buoyancy principle of the floating barrel, effective separation of grease and light components in the high-salinity wastewater is achieved, due to the design, the oil separation efficiency is improved, pollution of oil to the purity of follow-up crystallized salt is avoided, and therefore the high quality of the crystallized salt is ensured; the filtering box can be conveniently overturned and inclined, and filtered impurities are poured into the collecting box, so that the automatic cleaning of the filtering mechanism is realized.
Owner:SHANDONG RUIQI ENERGY TECH CO LTD
A lithium hexafluorophosphate crystal production apparatus
This invention relates to the field of lithium hexafluorophosphate (LiPF6) crystal production, and particularly to a LiPF6 crystal production apparatus, comprising a reaction chamber, a separator for solid-liquid separation of a LiPF6 solution, a crystallizer for condensing the LiPF6 solution connected to the lower side of the separator, and a dryer for heating and drying the crystals connected to the upper side of the separator. The invention involves preliminary filtration of the solution through a separation cylinder, followed by condensation processing in a feed pipe, where dissolved LiPF6 crystals are condensed and precipitated. The height difference between the falling solution and the feed tray causes the solution to splash onto the feed pipe wall, increasing the contact area between the solution and the pipe wall, thereby increasing the condensation efficiency and improving the production quality of LiPF6 crystals.
Owner:FUJIAN QINGLIU DONGYING CHEM CO LTD
Method for recovering lead from copper smelting dust
PendingEP4269634A4effective recoveryincrease concentrationSolvent extractionCrystallization separation
There is provided a method for recovering lead from copper smelting dust according to the present invention includes an alkali leaching step of leaching lead contained in copper smelting dust with an alkali solution, a step of performing a solid liquid separation on a post-leaching solution and a leaching residue after the alkali leaching step, a neutralization step of adding an acid to the separated post-leaching solution to precipitate a lead, and a step of recovering a precipitate containing the lead by performing a solid liqiud separation.
Owner:MITSUBISHI MATERIALS CORP
A purification plant comprising a crystallization unit with improved energy efficiency
PCT designated stageWO2026125504A1Lighting and heating apparatusCentral heating with accumulated heat
The present invention relates to a plant for purifying a crude composition by crystallization, wherein the plant comprises at least one crystallizer, at least one buffer vessel and at least two heat pumps, wherein each of at least two heat pumps is connected with at least one buffer vessel, as well as to a process for purifying a crude composition by crystallization being performed in such a plant.
Owner:SULZER MANAGEMENT AG
Method for separating lithium precursor and system for separating lithium precursor
ActiveCN119627284BCrystallization separationWaste accumulators reclaimingReactive gasPhysical chemistry
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.
Owner:SK INNOVATION CO LTD
Production device of calcium chloride and magnesium chloride and production method for preparing calcium chloride and magnesium chloride from dolomite
The invention relates to the technical field of chemical engineering, and provides a calcium chloride and magnesium chloride production device and a production method for preparing calcium chloride and magnesium chloride from dolomite, and the production device comprises a pretreatment assembly, a first-stage reaction kettle and a second-stage reaction kettle which are connected in sequence. The second-stage reaction kettle comprises a tank body, a first outlet formed in the upper part of the tank body and a second outlet formed in the bottom of the tank body. The first outlet is sequentially connected with a water washing tower, a drying device and an evaporation condenser. The second outlet is sequentially connected with a reduced-pressure evaporator, a low-temperature crystallizer, a horizontal centrifuge, a purification tank and a normal-pressure evaporator. The pretreatment assembly, the first-stage reaction kettle and the second-stage reaction kettle are sequentially arranged, so that gradient control over the reaction process is achieved, it is ensured that the acidolysis reaction is more thorough, the chemical purity of calcium chloride and magnesium chloride is improved, precise separation of gaseous impurities and liquid impurities is ensured, and the purification rate of a final product is further increased.
Owner:HAMIYU TENGXING ENTERPRISE SERVICES CO LTD +2
Conical surface seal head for cooling crystallization equipment
The utility model relates to a conical surface end socket for cooling crystallization equipment, which is applied to the field of cooling crystallization equipment and comprises an end socket body, a coil pipe is fixedly sleeved on the outer surface of the end socket body, two drain pipes are fixedly connected to the outer surface of the coil pipe, and a heat transfer plate is fixedly connected to the inner wall of the end socket body. The lower end of the end socket body is fixedly connected with a plurality of cooling fins, the outer surface of the end socket body is fixedly connected with a plurality of standby pipes, the lower end of the end socket body is fixedly connected with two discharging pipes, the outer surfaces of the discharging pipes and the lowest standby pipe are fixedly provided with one-way electric valves, and the outer surface of the end socket body is fixedly connected with two fixing plates. By the adoption of the coil pipe and other structures, the coil pipe is arranged outside the end socket, secondary cooling is directly conducted on a black titanium solution entering the end socket, the black titanium solution is discharged after reaching the standard temperature, and the practicability of the end socket is improved.
Owner:QINHUANGDAO DONGYAN ENERGY SAVING TECH CO LTD
Methods for quantifying starch and cellulose in corn samples
Solutions and methods are disclosed for the extraction and quantification of cellulose derived from cellulosic biomass samples. Improved extraction yields and selectivities are provided through the use of an extraction solvent mixture comprising an aprotic solvent such as DMSO, a quaternary ammonium salt such as TBAF, and an quaternary ammonium base such as TBAOH. The extracted cellulose can be optionally precipitated using disclosed precipitation solutions to further improve cellulose purity. Extracted cellulose can be measured by hydrolyzing the cellulose to glucose or cellobiose, or by using disclosed spectrophotometric assays of cellulose-salt complexes.
Owner:EDENIQ INC
Process for metal sulphidation
The invention provides a process for generating a metal sulphide comprising nickel and / or cobalt, comprising the steps of: i. forming an aqueous metal sulphate solution by reacting sulphuric acid with a raw material feed comprising nickel and / or cobalt in water; ii. crystallizing said metal sulphate from said aqueous metal sulphate solution to form a crystallized metal sulphate in a mother liquor, the mother liquor comprising an uncrystallized metal sulphate; iii. separating said crystallized metal sulphate from said mother liquor; iv. reacting at least a portion of said uncrystallized metal sulphate with hydrogen sulphide in an acidic aqueous medium, thereby obtaining a slurry consisting of a solid phase comprising a metal sulphide precipitate and an aqueous phase comprising one or more impurities and sulphuric acid; and v. separating said solid phase and said aqueous phase.
Owner:UMICORE(BE)
Purification of Scandium Concentrate
For the purpose of reducing contamination of scandium oxide products, the present disclosure provides a method for removing at least one metal contaminant from a scandium (Sc) concentrate. The method is based on contacting the Sc concentrate with an ion exchange resin to obtain a purified Sc eluate or raffinate. The first and second ion exchange resins are strong acid cation resins having sulfonic acid functional groups in the potassium or sodium form. The purified Sc eluate or raffinate can be used to produce a scandium oxide product having reduced amounts of metal ion contaminants.
Owner:RIO TINTO IRON & TITANIUM CANADA INC
Waste liquid evaporation treatment equipment and evaporation process for waste alkali liquid treatment
InactiveCN120441148AWater treatment parameter controlWater/sewage treatment by centrifugal separationThermodynamicsProcess engineering
The invention relates to the technical field of waste lye treatment, and discloses waste liquid evaporation treatment equipment and an evaporation process for waste lye treatment.The waste liquid evaporation treatment equipment comprises an evaporation assembly, a feeding assembly is arranged on one side of the evaporation assembly, an agent assembly is arranged on the outer side of the feeding assembly, and valve assemblies are arranged in the agent assembly and the feeding assembly; a heating assembly is arranged on one side of the evaporation assembly, and a circulation assembly is arranged between the heating assembly and the evaporation assembly. According to the device, the rotating end of the valve assembly is rotated, so that the waste alkali liquid and a defoaming agent can flow into the feeding assembly at the same time and are mixed, and under the assistance of the defoaming agent, the waste alkali liquid does not generate a foam phenomenon when being evaporated; therefore, a medium in the heating assembly can better exchange heat with the waste alkali liquid which continuously circulates, and meanwhile, the actual evaporation capacity of the evaporation crystallizer is not reduced when the waste alkali liquid is evaporated, so that the energy consumption and the operation cost are reduced when the equipment works.
Owner:BEIJING JIUZHANG ENVIRONMENTAL ENG CO LTD
Synthesis and purification of CBDA
ActiveUS12304885B2Preparation from carboxylic acid saltsOrganic compound preparationQuinoneOrganic base
Methods and systems for the preparation of high purity and high quality cannabinoid acids and metal salts of cannabinoids. Cannabidiolic acid (CBDA) is a major cannabinoid of interest for and health reasons. It is the natural precursor of cannabidiol (CBD). The invention provides methods for the synthesis of CBDA from CBD with reagents that produce a high purity product without need for further purification. Insertion of a magnesium complexing agent prior to conversion of the reaction intermediate to the final acid product produces a high purity product with aesthetically pleasing white color and neutral odor. Methods are provided for the simultaneous synthesis and purification of cannabinoid acids, especially CBDA, produced from high purity CBD (or other cannabinoid) via a Kolbe-Schmitt type reaction using an organic base, such as DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), incorporating complexation of acid anions to a multivalent metal, alkaline earth or transition metal, prior to product acid work-up. During the work-up to the final acid, the distinct solubility of the complex in selected solvents is used advantageously to first exclude water soluble reagents and impurities and next to exclude lipophilic hydroxyl-quinone impurities, as well as any unconverted CBD.
Owner:THE REGENTS OF THE UNIVERSITY OF COLORADO
Device and method for separating nervonic acid from malania oleifera oil for biological medicine manufacturing
InactiveCN120624119ACrystallization separationHollow article cleaningNervonic acidReciprocating motion
The invention relates to the technical field of nervonic acid extraction, in particular to a device and method for separating nervonic acid from malania oleifera oil for biological medicine manufacturing, the device comprises a distiller, the distiller comprises a sealing tank and a dismounting cylinder, and a film scraping mechanism and a plurality of negative pressure tanks are arranged in the sealing tank and the dismounting cylinder respectively. According to the device and method for separating nervonic acid from malania oleifera oil for biological medicine manufacturing, a spiral scraping plate of a lifting part is linked with a reciprocating lead screw through a clamping ring, synchronous rotation and up-down reciprocating motion are achieved, the whole surface of a condensation pipe is covered, a condensate liquid film is actively scraped away, heat resistance of a retained liquid film is eliminated, the condensation efficiency is improved, and the efficiency of separation of nervonic acid from malania oleifera oil is improved. The nervonic acid fraction is prevented from staying on a condensation wall for a long time, and the condition of thermal degradation or backmixing is prevented.
Owner:YUNNAN YUNCEN BIOTECHNOLOGY CO LTD
Carbon dioxide mineralisation
PCT designated stageWO2026039872A1Calcium/strontium/barium carbonatesMagnesium carbonatesEnvironmental engineeringCarbonate
The present disclosure relates to a method of carbon dioxide mineralisation, the method comprising: treating a material, such as a mineral, with carbon dioxide and a base, wherein the treatment occurs in solution phase, the material comprising: a first cation that is Ca or Mg; a second cation which is not Ca and or Mg; and one or more anions which are not carbonate; such that a product solution comprising an acid or a salt of the base and one of the one or more anions and a salt of the second cation and one of the one or more anions is formed, and a carbonate salt of the first cation is caused to precipitate.
Owner:TECHNOLOGICAL RESOURCES PTY LTD
Crystallizer shell structure
Owner:GUANGDONG ZHONGZE HEAVY IND CO LTD
Method for recovering washing fluid, device for recovering the same, and washing fluid recovered thereby
The present invention relates to a method for recovering a washing fluid, a device for recovering the same, and a washing fluid recovered thereby. More particularly, the method includes synthesizing positive electrode active material particles including a nickel-containing lithium composite oxide, injecting a first washing fluid into the positive electrode active material particles and mixing, where the first washing fluid includes a coating raw material, a precipitant, and a solvent, filtering the mixture to separate a liquid mixture, and recovering the separated liquid mixture, wherein a concentration of lithium in the recovered washing fluid is about 3500 ppm or more.
Owner:SAMSUNG SDI CO LTD +1