97 results about "Cobalt Sulfate" patented technology

The invention belongs to the technical field of waste battery recovery and regeneration, and particularly relates to a method for recovering valuable metal from a waste lithium battery positive electrode material. The method comprises the following steps: carrying out sulfuration roasting on waste positive electrode powder, selectively extracting lithium in a water leaching manner, and precipitating lithium to obtain lithium carbonate; separating and purifying the nickel, the cobalt and the manganese through microwave acid leaching, precipitation impurity removal and step-by-step extraction to obtain extract liquor of the nickel, the cobalt and the manganese, and performing reverse extraction on the extract liquor to obtain battery-grade cobalt sulfate, battery-grade nickel sulfate and battery-grade manganese sulfate. According to the method, lithium is extracted firstly, the influence of the lithium element on subsequent nickel-cobalt-manganese extraction is reduced, meanwhile, the recovery rate of lithium is increased through the water leaching method, and the recovery cost is reduced. According to the method, precipitation and impurity removal are performed before nickel-cobalt-manganese extraction, so that the content of impurities in a sulfate solution is reduced, and the recovery rate of nickel, cobalt and manganese is greatly improved.

The invention relates to a battery material preparation technology, in particular to a method for preparing high-purity cobaltous sulfate from crude cobaltous hydroxide, which comprises the following steps: S1, reacting the crude cobaltous hydroxide with sulfuric acid to generate magnesium sulfate; s2, washing to remove magnesium; s3, adding sulfuric acid and hydrogen peroxide into the crude cobalt hydroxide after magnesium washing; adding crude cobalt hydroxide to adjust the pH value to obtain a purified solution; s4, adding sodium fluoride into the purified liquid, and filtering after reaction to obtain filtrate; s5, saponifying with sodium hydroxide by using an acidic extractant, then performing soap conversion by using a cobalt sulfate solution, extracting manganese in the filtrate by using an obtained organic phase, and then performing reverse extraction on the organic phase by using sulfuric acid to obtain a manganese sulfate solution; s6, the raffinate obtained after manganese extraction is introduced into an adsorption tower loaded with a zirconium-based composite fluorine adsorbent; and S7, concentrating and crystallizing the defluorinated solution. According to the method, the zirconium-based composite fluorine adsorbent is introduced to be coupled with the process, fluorine ions can be removed, and cobalt loss caused by cobalt fluoride precipitation and the influence of the fluorine ions on the quality of a cobalt sulfate product are avoided.

The present invention discloses a method for extracting and recovering cobalt-containing choline chloride ethylene glycol deep eutectic solvent electrolytic waste liquid, and relates to the field of waste resource recovery. Steps are as follows: 1) water and extractant are added to cobalt-containing electrolytic waste liquid, and oil phase pH is adjusted after stirring. After sufficient reaction, cobalt-containing organic extract and aqueous deep eutectic solvent are separated and obtained; 2) dilute sulfuric acid is added to the cobalt-containing organic extract obtained in step 1), aqueous phase pH is adjusted and back-extracted, and then aqueous phase and organic phase are separated, and aqueous phase is distilled under reduced pressure to obtain cobalt sulfate solid; Organic phase returns to step 1) and is reused as extractant; 3) by step 1) The aqueous deep eutectic solvent obtained is passed through reduced pressure distillation, and the choline chloride ethylene glycol deep eutectic solvent of regeneration is obtained. The recovery method of the present invention has a high recovery rate for cobalt and choline chloride ethylene glycol deep eutectic solvent, and process is simple, environmentally friendly, and has a large application prospect.

This invention discloses a method for preparing a tufted nickel-cobalt hydroxide nanomaterial modified electrode material. The tufted nickel-cobalt hydroxide is prepared on carbon paper using a constant potential method. The electrolyte is a solution of nickel sulfate and cobalt sulfate. The specific operation is as follows: S1. Carbon paper pretreatment; S2. Electrode preparation is a solution containing nickel sulfate and cobalt sulfate; S3. Electrode preparation finally obtains the tufted electrode material.

The present invention discloses an electronic-grade cobalt sulfate and its purification method and application, belonging to the field of chemical process technology. The electronic-grade cobalt sulfate purification method of the present invention comprises the following steps: S1, deoiling: deoiling a crude cobalt sulfate solution through an adsorbent to obtain a deoiled cobalt sulfate solution; S2, ion exchange: purifying the deoiled cobalt sulfate solution through an ion exchanger to obtain a purified cobalt sulfate solution; S3, recrystallization: evaporating and concentrating the purified cobalt sulfate solution, cooling and crystallizing it, and controlling the crystal yield to be greater than 0 and less than or equal to 60%, to obtain electronic-grade cobalt sulfate crystals. The purification method of the present invention can effectively remove impurities in the crude cobalt sulfate solution through the steps of deoiling, ion exchange and recrystallization, combined with the control of the crystal yield, to obtain electronic-grade cobalt sulfate crystals and an electronic-grade cobalt sulfate solution with low total metal impurity content and low total organic carbon content. The electronic-grade cobalt sulfate crystals and the electronic-grade cobalt sulfate solution have stable and good performance, and are particularly widely used in the field of nano-chip integrated circuits.

In relation to an alloy powder that contains at least nickel, cobalt and copper, the present invention provides features which increase acid leaching properties and shorten a leaching time and which enable production of an aqueous mineral acid salt solution containing high concentrations of nickel and cobalt.　This alloy powder contains at least nickel, cobalt and copper, has a copper content of 25 mass% to 45 mass%, and has a specific surface area of 0.07 m2 / g or more. In addition, this method for producing an alloy powder includes: a step for preparing an alloy which contains at least nickel, cobalt and copper and which has a copper content of 25 mass% to 45 mass%; and a step for obtaining an alloy powder having a specific surface area of 0.07 m2 / g or more by subjecting the alloy that has been prepared to atomization.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

The invention discloses a method for purifying metal impurities in cobaltous sulfate, a pure cobaltous sulfate product and application of the pure cobaltous sulfate product, and the purification method comprises the following steps: 1) evaporating a cobaltous sulfate aqueous solution to a supersaturated state, cooling and crystallizing, and heating; and 2) carrying out solid-liquid separation to obtain crystals and mother liquor. By adopting the purification method disclosed by the invention, the content of each metal impurity in the cobaltous sulfate is reduced to be below 100ppb, and the use requirements of the electroplating liquid for cobalt interconnection of the integrated circuit are met.

The invention discloses an extraction process of a nickel sulfate solution in a nickel electrodeposition production process. The extraction process comprises an extraction impurity removal system and a reverse extraction washing system, an extraction and impurity removal system is set to be in four stages, nickel sulfate feed liquid before purification enters from a first-stage multiphase flow reactor, organic matter after saponification enters from a fourth-stage multiphase flow reactor, and qualified nickel sulfate solution is obtained through four-stage counter-current extraction and clarification; the reverse extraction washing system is arranged to be in five stages, the first stage is used for nickel washing, the clarified loaded organic matter is sent to the second stage and the third stage to be subjected to countercurrent reverse extraction cobalt washing, the fourth stage and the fifth stage are used for reverse extraction iron washing, cobalt washing acid in a second-stage cobalt washing clarification tank is a cobalt sulfate solution, and the organic matter is saponified and reused after fifth-stage iron washing clarification. The extraction technology overcomes the defects that in the prior art, the separation coefficient and the distribution ratio of nickel and cobalt in an extraction agent are small, nickel and cobalt separation and collection are not thorough, the production technological process is long, the treatment capacity is small, and the occupied area is large. The device has the advantages of good mixing effect, high extraction efficiency, large treatment capacity and large-scale production.

The application provides a method for comprehensive utilization of valuable metals in waste ternary lithium ion battery electrode powder, comprising the following steps: (1) mixing the waste ternary lithium ion battery electrode powder with concentrated sulfuric acid, and roasting under a mixed atmosphere of sulfur dioxide and air; (2) water immersion of the roasted material, and solid-liquid separation to obtain a lithium-containing cobalt-nickel-manganese sulfate solution and a graphite filter residue; (3) adding manganese sulfide to the lithium-containing cobalt-nickel-manganese sulfate solution to react, and solid-liquid separation to obtain a filtrate and a precipitate residue; (4) oxidizing and roasting the precipitate residue; (5) water immersion and acid immersion of the roasted product to obtain a nickel-cobalt sulfate solution, and impurity removal of the nickel-cobalt sulfate solution to obtain a battery-grade nickel-cobalt sulfate solution; and (6) sulfuration and manganese precipitation of the filtrate, solid-liquid separation after reaction, and obtaining of crude manganese sulfide and a lithium-rich solution. The method has low cost, high reduction rate of metals in the electrode powder, can realize recycling of sulfur, avoid pollution, and has high metal recovery rate.

The invention provides an aluminum-doped lithium cobalt oxide precursor and a preparation method and application thereof, and the preparation method comprises the following steps: (1) a nucleation stage: adding a cobalt chloride solution, an aluminum salt solution and a precipitant solution into a reaction base solution, and carrying out first coprecipitation to obtain a solution containing an inner core; (2) growth stage: adding a cobaltous sulfate solution, an aluminum salt solution and a precipitant solution into the solution containing the inner core obtained in the step (1), and carrying out second coprecipitation to obtain a solution containing precipitates; and (3) final stage: adding a solution containing cobalt chloride and cobalt sulfate, an aluminum salt solution and a precipitator solution into the solution containing the precipitate obtained in the step (2), carrying out third coprecipitation, and carrying out heat treatment to obtain the aluminum-doped lithium cobalt oxide precursor. According to the preparation method, the problems of particle cracking and small particle explosion of aluminum-doped cobaltosic oxide under the condition of high aluminum doping amount can be avoided, and a lithium cobalt oxide battery prepared from the obtained aluminum-doped lithium cobalt oxide precursor shows excellent electrochemical performance.

The present invention provides a method for producing high-purity cobalt sulfate by separating impurities and cobalt from a cobalt chloride solution containing impurities without using an electrolysis process. The method sequentially implements the following steps: a decoppering step (S1), in which a sulfiding agent is added to a cobalt chloride solution containing one or more impurities selected from copper, zinc, manganese, calcium, and magnesium to form a copper sulfide precipitate, which is then separated and removed; a neutralization step (S2), in which a neutralizing agent or a carbonating agent is added to the cobalt chloride solution that has undergone the decoppering step (S1), to form cobalt hydroxide or alkaline cobalt carbonate, thereby separating the magnesium; a leaching step (S3), in which sulfuric acid is added to the cobalt hydroxide or alkaline cobalt carbonate to obtain a cobalt sulfate solution; and a solvent extraction step (S4), in which an organic solvent containing an alkylphosphoric acid-based extractant is brought into contact with the cobalt sulfate solution to extract zinc, manganese, and calcium into the organic solvent for separation and removal. The addition of the neutralizing agent or carbonating agent in the neutralization step (S2) is performed using a countercurrent multi-stage process.

This invention belongs to the field of phosphorus removal technology, and specifically relates to a deep phosphorus removal method for cobalt sulfate solution through multi-stage synergistic treatment. This invention relates to a deep phosphorus removal method for cobalt sulfate solution through multi-stage synergistic treatment, comprising the following steps: S11. Pretreatment and primary phosphorus removal; S12. Synergistic extraction; S13. Deep purification with resin; S14. Evaporation and crystallization: the exchange liquid obtained in step S13 is concentrated, crystallized, filtered, and washed to obtain cobalt sulfate heptahydrate, and the mother liquor is returned to step S11 for recycling; S15. Phosphorus recovery from phosphorus-containing liquid. The beneficial effects of this invention are: (1) Impurity phosphorus can be deeply purified, and the phosphorus content of the prepared cobalt sulfate heptahydrate is ≤0.00003wt% using the deep phosphorus removal method for cobalt sulfate solution through multi-stage synergistic treatment; (2) The process is mild and easy to promote and apply; (3) The resource utilization of solid waste iron slag transforms solid waste into intermediate products, increasing economic value.

The invention provides basic cobalt carbonate with high carbonate content and a preparation method thereof, and belongs to the technical field of cobalt compound preparation. The basic cobalt carbonate can be used as a cobalt source or a cobalt compound precursor for a positive electrode material. The method comprises the following steps: introducing carbon dioxide into a sodium carbonate solution in advance to obtain a pre-carbonized sodium carbonate solution; synchronously dropwise adding the pre-carbonized sodium carbonate solution and the cobaltous sulfate solution for reaction under the condition of partial pressure of carbon dioxide, and controlling the pH value of the reaction solution to obtain reaction slurry; aging the reaction slurry under a carbon dioxide pressurization condition, regulating the pH value, and filtering to obtain a wet filter cake; the wet filter cake is sequentially subjected to sodium bicarbonate solution replacement washing and carbon dioxide saturated deionized water washing, then dried, smashed and screened, and a product is obtained; the method disclosed by the invention is beneficial to improving the carbonate introduction degree of basic cobalt carbonate and reducing soluble salt entrainment, and few insoluble residues are generated in acid medium dissolution evaluation.

The invention discloses a method for preparing a cobaltous sulfate solution and cobaltous sulfate crystals by using cobalt-containing solid raw materials, which comprises the following steps of: carrying out slurrying pretreatment on the cobalt-containing solid raw materials such as cobalt concentrate, cobalt slag or waste lithium battery positive electrode materials and the like as starting materials; through continuous operation of multi-stage dissolution and multi-stage iron removal (an oxygen and sodium carbonate iron removal system is adopted to replace a traditional sodium hypochlorite and sodium carbonate iron removal system), the cobalt leaching rate is larger than or equal to 97%; subsequently, P204 extraction and impurity removal, P507 nickel-cobalt separation, oil removal and purification are carried out, and a high-quality cobalt sulfate solution is obtained; the solution can be directly supplied to a ternary product production line in a short distance (less than or equal to 8km), or through MVR evaporation concentration, Olso cooling crystallization, centrifugal separation and drying, cobalt sulfate crystals suitable for long-distance transportation are obtained. Meanwhile, MVR evaporation condensate water and high-impurity centrifugal mother liquor are returned to be used for preparing reverse extraction acid needed by P507 extraction, dryer steam condensate water is returned to be used for heating of the slurrying procedure, cyclic utilization of water resources and energy in the whole process is achieved, and the method is suitable for industrial production of high-quality cobalt sulfate products.

The present invention discloses a method for preparing an iron-based high-entropy micro-nano alloy Fenton catalyst. The method comprises the following steps: first, activating a pure copper electrode; then preparing an electrolyte solution of ferrous sulfate / copper sulfate / cobalt sulfate / nickel sulfate / zinc sulfate / manganese sulfate; adding a chelating agent, a hydrogen evolution inhibitor, and an auxiliary agent to the electrolyte solution; using the activated pure copper electrode as the cathode and a ring-shaped graphite electrode as the anode; constructing an electrodeposition device comprising the cathode, an anion exchange membrane, and a transparent quartz reaction tank base, the electrodeposition device containing the electrolyte; connecting the positive electrode of a power supply to the anion exchange membrane and the negative electrode of the power supply to the cathode; immersing the anode in the electrolyte; setting a current density reaction, and depositing iron-based high-entropy micro-nano alloy powder at the cathode; and finally collecting the catalyst powder. The method of the present invention exhibits excellent catalytic performance for PMS over a wide pH range.

The present invention relates to the technical field of metal materials, and discloses a pre-nickel-plated steel for battery shells and a preparation method thereof. The method includes hot rolling, coiling, pickling, cold rolling, nickel electroplating and continuous annealing; the nickel electroplating process includes: preparing nickel sulfate, nickel chloride, cobalt sulfate, boric acid, sodium lauryl sulfate, citric acid, pre-treated filler, nano-titanium dioxide particles and cerium salt into an electroplating solution, and then placing the steel substrate obtained after cold rolling in the electroplating solution for electroplating, wherein the concentration of the pre-treated filler is 1.2-1.5 g / L, the concentration of the nano-titanium dioxide particles is 0.5-1.0 g / L, and the concentration of the cerium salt is 0.1-0.2 g / L. The pre-nickel-plated steel for battery shells prepared by this method has excellent corrosion resistance, high hardness, good stamping performance, strong bonding between the nickel plating layer and the steel substrate, and low surface iron exposure rate.

The invention discloses a three-stage flash continuous crystallization method of nickel and cobalt sulfates, and belongs to the field of inorganic salt preparation. Comprising the following steps: S1, evaporating and concentrating a nickel sulfate or cobaltous sulfate dilute solution to a nearly saturated state; s2, a concentrated solution pump is used for conveying the concentrated solution to a first-stage DTB flash evaporation crystallization tank, high-temperature feed liquid is subjected to primary flash evaporation cooling, controllable supersaturation degree is formed, and crystals are separated out; s3, transferring the material in the primary DTB flash crystallization tank to a secondary DTB flash crystallization tank through a primary transfer pump, carrying out secondary flash evaporation cooling on the material liquid to form a controllable supersaturation degree, and separating out and growing crystals; s4, transferring the material in the second-stage DTB flash crystallization tank to a third-stage OSLO flash crystallization tank by virtue of a second-stage transfer pump, carrying out flash evaporation cooling on the material liquid for three times to form a controllable supersaturation degree, and separating out crystals and continuously growing; and S5, enriching qualified crystals at the bottom of the OSLO crystallizing tank, performing centrifugal separation on crystal mush after thickening, and drying wet crystals at low temperature to obtain the product, thereby solving the problems of fine crystal accumulation and inflexible particle size adjustment.

The present invention discloses a method for producing cobalt sulfate and its application. The method comprises the following steps: step (1) dilute acid impurity removal; step (2) acid leaching reduction; step (3) precipitation impurity removal; step (4) deep extraction impurity removal; step (5) further precipitation impurity removal; and step (6) recrystallization. The cobalt sulfate obtained by the production method of the present application meets the requirements of battery-grade cobalt sulfate and can be used for the synthesis of ternary precursors.

The present invention discloses a kind of high-efficiency composite carbon capture solid adsorbent and its preparation method and application, belong to the technical field of carbon capture materials.Its technical scheme is: it is made by dipping honeycomb in active liquid, and preparation method comprises the following steps: 1) chromium sulfate, manganese acetate and cobalt sulfate are added with water, and then quartz sand and silica gel are added and stirred; 2) calcium sulfate is ground, and then beta-alumina and cocamidopropyl are added; 3) dioctyl phthalate, carboxymethyl cellulose, poly-α-olefin, plasticizer, dispersant one and adhesive are kneaded to form mud material; honeycomb is extruded, dried, and calcined at high temperature to obtain modified silica honeycomb; 4) linear polyacrylimide, modifier, dispersant two and dispersing solvent are stirred and mixed uniformly to form active impregnation solution; 5) impregnation solution, ultrasonic, obtain high-efficiency composite carbon capture solid adsorbent. The present invention makes the distribution of amine-based active ingredients more uniform, improves carbon dioxide adsorption and capture capacity.

This disclosure provides systems, methods, and apparatus related to lithium-ion batteries. In one aspect, a method includes synthesizing an intermediate selected from a group of a nickel-manganese-cobalt nitrate, a nickel-manganese-cobalt acetate, a nickel-manganese-cobalt sulfate, a nickel-manganese-cobalt chloride, and a nickel-manganese-cobalt phosphate. The intermediate is mixed with a lithium salt selected from a group of LiOH, LiCl, LiNO3, LiSO4, LiF, LiBr, Li3PO4, Li2CO3, and combinations thereof to form a mixture. The mixture is annealed at a sequence of temperatures and times to form a plurality of single crystals of a lithium nickel-manganese-cobalt oxide, with no cooling of the mixture between operations of the sequence of temperatures and times.

The utility model relates to an anti-cross-pollution water seal device for a waste gas absorption pipeline of a cobalt sulfate workshop, and belongs to the technical field of waste gas treatment. The device mainly comprises an exhaust tank C1, an air suction tank C2, a liquid accumulation tank C3, an atmosphere air inlet pipe, a three-way communicating pipe, an air outlet pipe, a first conveying hose, a second conveying hose and a glass tube liquid level meter, water is added into a C1 exhaust tank, a C2 suction tank and a C3 liquid accumulation tank, when the pressure in the hydrochloric acid storage tank is positive, waste gas in the tank crosses the C2 suction tank and enters a C1 exhaust tank water seal to complete the exhaust process, exhausted tail gas normally enters a tail gas treatment system, and when the pressure in the hydrochloric acid storage tank is negative, the waste gas in the tank and external air enter the C2 suction tank water seal to complete the exhaust process. And the hydrogen chloride waste gas is dissolved in the C2 suction tank, so that the hydrogen chloride waste gas and the sulfuric acid mist waste gas can be effectively prevented from cross blow-by in the pipeline, and the mutual pollution of respective original waste gas source storage tanks is avoided, thereby ensuring the quality of the sulfuric acid solution and the hydrochloric acid solution.

The application belongs to the technical field of batteries and electric power, and discloses a storage battery activating liquid for a transformer substation, which is characterized by being composed of sodium sulfate, sodium chloride, calcium phosphate, magnesium phosphate, cobalt sulfate, cadmium sulfate, stannous sulfate, copper sulfate, zinc sulfate, nickel sulfate and aluminum sulfate solution. The application also discloses a storage battery activating method for a transformer substation and a holiday barbecue vehicle activated by the activating method. The application has the following main beneficial effects: good activating / repairing effect, improved capacity of returned storage batteries, chemical environmental protection, low cost and wide application range.

This invention belongs to the field of extraction and separation technology, and specifically relates to a method for the synergistic extraction of Cu and Mn from a cobalt sulfate solution. The extraction method of this invention includes the following steps: S1. Preparation of the pre-extraction solution; S2. Preparation of the synergistic extractant; S3. Saponification: using 20wt% Na... 2 The co-extractant obtained in step S2 is saponified with CO3 solution to obtain the saponified co-extractant; S4. Preparation of back-extraction solution; S5. Connecting X extractors in series to form a multi-stage countercurrent extraction device; S6. Connecting Y extractors in series to form a multi-stage countercurrent back-extraction device; S7. Continuous countercurrent extraction; S8. Continuous countercurrent back-extraction. The method for co-extracting Cu and Mn from cobalt sulfate solution provided by this invention can effectively reduce CoSO4. 4 The concentration of Cu and Mn in the solution can improve the treatment efficiency of cobalt sulfate solution.

The utility model discloses an oil removal device for a cobalt sulfate solution. The oil removal device comprises a filtering main body and a multi-station connector, the filtering main body is composed of a plurality of adsorption column units, each adsorption column unit is filled with adsorption resin, a sample inlet is formed in the top of each adsorption column unit, and a sample outlet is formed in the bottom of each adsorption column unit; the multi-station connectors are petal-shaped, and the top end and the bottom end of the filtering main body are respectively and fixedly connected with one multi-station connector; mounting grooves are formed in the multi-station connector in the peripheral direction and used for clamping and fixing the ends of the adsorption column units, and the number of the mounting grooves is consistent with that of the adsorption column units. A plurality of adsorption column units are integrated on the basis of a multi-station connector structure, the oil removal device has the advantage of being compact in structure, the adsorption column units can work synchronously, the solution treatment capacity of the oil removal device can be improved, and therefore the oil removal efficiency of the oil removal device is improved.

The invention discloses a heat dissipation type glass fiber plate for a rear cover of a mobile phone and a preparation process of the heat dissipation type glass fiber plate, and relates to the technical field of glass fiber plate materials. Glass fiber cloth is subjected to glue solution coating treatment, so that the strength and the heat conductivity coefficient of the glass fiber cloth are improved. The glass fiber cloth is firstly coated with a phytic acid chitosan composite solution, so that the corrosion resistance and flame retardance of the glass fiber cloth are improved. Then, a cobaltous sulfate aqueous solution is coated, cobalt ions in the cobaltous sulfate aqueous solution can form coordination with the phytic acid chitosan composite solution and can form coordination with hydroxyl and amino in the glue solution, and the binding force between the glass fibers and the glue solution is improved.

The invention provides a method for comprehensively recovering valuable elements from a waste ternary lithium battery positive electrode material, and relates to the technical field of waste battery recycling. The recycling method comprises the following steps: 1) heating and dissolving nickel cobalt manganese lithium sulfate crystals obtained by leaching the waste ternary lithium battery positive electrode material with sulfuric acid as a raw material, and then cooling to room temperature for crystallization to obtain nickel cobalt sulfate crystals and crystallization mother liquor; 2) dissolving the cobalt nickel sulfate crystal, extracting to obtain a nickel sulfate solution and a cobalt-containing organic phase, crystallizing the nickel sulfate solution to obtain nickel sulfate, performing reverse extraction on the cobalt-containing organic phase to obtain a cobalt sulfate solution, and crystallizing to obtain cobalt sulfate; 3) adding a nanofiltration aid into the crystallization mother liquor, and then carrying out nanofiltration to obtain a monovalent lithium solution and a high-valence element solution; the invention discloses a method for separating valuable elements from nickel, cobalt, manganese and lithium, which comprises the following steps of: 1) preparing a monovalent lithium solution, 2) adding manganese dioxide into the monovalent lithium solution, 4) adjusting the pH value of the monovalent lithium solution, and introducing a precipitator to precipitate lithium to obtain lithium carbonate, and 5) adjusting the pH value of the high-valence element solution, adding manganese dioxide, and introducing ozone to precipitate manganese.. The method can efficiently separate the valuable elements of nickel, cobalt, manganese and lithium, and has the advantages of low energy consumption, short process, low cost, environmental friendliness and the like.

The invention provides a high-purity cobalt sulfate solution as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking a cobalt plate as an anode, an inert metal plate as a cathode and a dilute sulfuric acid solution as an electrolyte, carrying out electrolysis in an electrolytic bath to obtain a cobalt sulfate stock solution, and filtering to obtain the high-purity cobalt sulfate solution. According to the technical scheme, synthesis and preliminary purification of the cobalt sulfate solution can be achieved at the same time, the process is simple, parameters are easy to control, efficiency is high, meanwhile, the content of key impurity elements such as Fe, Ni, Cu and Pb in the prepared cobalt sulfate solution is lower than 50 ppb, and the purity requirement of the electroplating solution for cobalt interconnection of an integrated circuit is met.

The invention discloses a method for recovering valuable metals in nickel soot, which comprises the following steps: realizing high-efficiency leaching of nickel, copper, cobalt and zinc through reduction-oxidation combined pressure leaching, and respectively recovering copper sulfate, zinc sulfate and nickel sulfate cobalt solution by adopting a multi-stage extraction separation technology. Separation and recovery of valuable metals in the nickel soot are achieved, impurities such as harmful elements arsenic and lead in the nickel soot are removed, and the quality of nickel products is effectively guaranteed. The method solves the problems of impurity enrichment and low valuable metal leaching rate in the traditional process, the open circuit rate of harmful elements such as lead and iron is greater than or equal to 95%, and the nickel-cobalt recovery rate is greater than or equal to 90%.

This invention discloses a trace element composition and its application for improving the fermentation efficiency of *Clostridium autoethanogenum* under conditions containing CO2 and H2 syngas, belonging to the field of microbial fermentation technology. The trace element composition comprises the following components: 1.5% nitroglycerin, 3% magnesium sulfate, 0.5% manganese sulfate, 0.1% ferrous sulfate, 0.18% cobalt sulfate, 0.1% calcium chloride, 0.18% zinc sulfate, 0.01% copper sulfate, 0.02% potassium aluminum sulfate, 0.01% boric acid, 0.01% sodium molybdate, 0.03% nickel chloride, and 0.004% sodium tungstate. Using the trace element composition of this invention, after 4 days of fermentation under conditions containing CO2 and H2 syngas (CO2:H2=1:2, CO-free), the cell concentration is nearly twice that of the control group without the composition, and the syngas utilization rate is significantly improved. This invention provides an effective technical solution to the problem of low fermentation efficiency of self-producing ethanol Clostridium in a pure CO2 and H2 system, and has good prospects for industrial application.