164 results about "Cobalt Sulfate" patented technology

The invention relates to the technical field of hazardous waste utilization, in particular to a comprehensive utilization method of a waste catalyst. The method specifically comprises the following steps: sequentially carrying out oxidizing roasting, wet ball milling and pressure leaching on the waste catalyst to obtain a first leaching solution and leaching residues; the first leachate is extracted in a multi-stage counter-current extraction mode, molybdenum and tungsten in the first leachate are extracted, and back extraction is conducted to obtain back extraction liquid containing molybdenum and tungsten; the strip liquor is subjected to standing deoiling, evaporation concentration and multi-stage counter-current extraction vanadium removal in sequence, and raffinate and vanadium-containing strip liquor are obtained; the raffinate mainly contains molybdate radicals and tungstate radicals; determining a separation mode according to different molar ratios of molybdenum and tungsten; carrying out acid leaching on the leaching residues by utilizing a sulfuric acid solution at normal temperature and normal pressure to obtain a second leaching solution; and a cobalt extraction agent and a nickel extraction agent are respectively used for extraction, and a cobalt sulfate product and a nickel sulfate product are obtained after reverse extraction and evaporative crystallization. According to the method provided by the invention, metal resources such as vanadium, tungsten, cobalt, molybdenum and nickel in the waste catalyst can be recycled.

The invention discloses electronic-grade cobaltous sulfate as well as a purification method and application thereof, and belongs to the technical field of chemical processes. The purification method of the electronic-grade cobalt sulfate comprises the following steps: S1, deoiling: deoiling a cobalt sulfate crude product solution through an adsorbent to obtain a cobalt sulfate deoiling solution; s2, ion exchange: purifying the cobalt sulfate deoiling liquid through an ion exchanger to obtain a cobalt sulfate purified liquid; and S3, recrystallization: carrying out evaporation concentration and cooling crystallization on the cobalt sulfate purified liquid, and controlling the crystal yield to be greater than 0 and less than or equal to 60% to obtain the electronic-grade cobalt sulfate crystal. According to the purification method, through the steps of oil removal, ion exchange and recrystallization and the combination of crystal yield control, impurities in the cobalt sulfate crude product solution can be effectively removed, the electronic-grade cobalt sulfate crystal and the electronic-grade cobalt sulfate solution which are low in total metal impurity content and low in total organic carbon content are obtained, and the electronic-grade cobalt sulfate crystal and the electronic-grade cobalt sulfate solution have stable and good use performance and are suitable for industrial production. And the method is particularly widely applied to the field of nanoscale chip integrated circuits.

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 invention discloses a steel belt with a high-wear-resistance coating and a machining process of the steel belt, and relates to the technical field of stainless steel belts. According to the scheme, a stainless steel band is used as a base material, the stainless steel band can be a cold-rolled steel band or a hot-rolled steel band, and the specific model can be limited according to actual application requirements; the surface of the stainless steel band is subjected to oil removal and hydrochloric acid activation, then the stainless steel band is sequentially placed in a nickel layer plating solution A and a nickel layer plating solution B, a double-layer plating layer is formed through electroplating, nickel sulfate serves as main salt in the nickel layer plating solution A, and a nickel layer is pre-plated on the surface of the stainless steel band; nickel sulfate and cobaltous sulfate are used as main salts in the nickel layer plating solution B, and a nickel-cobalt plating layer is formed on the surface of the pre-nickel-plated layer, so that a composite plating layer with excellent wear resistance is formed on the surface of the stainless steel band, and the corrosion resistance of the stainless steel band is also improved.

The invention provides a doubling treatment method of battery black powder and nickel cobalt hydroxide. The doubling treatment method comprises the following steps: carrying out reduction roasting and water immersion treatment on the battery black powder to obtain a first lithium-containing liquid and a solid product; carrying out acid leaching on the solid product to obtain a leaching solution; after removing impurities from the leachate, extracting the leachate with a first saponification extraction agent to obtain first raffinate and a first extraction organic phase; carrying out soap conversion reaction on the first raffinate and a second saponification extraction agent to obtain a second extracted and soap-converted organic phase and a second lithium-containing liquid; carrying out acid leaching and impurity removal on nickel cobalt hydroxide, and carrying out extraction reaction on the solution and the second extraction soap-converted organic phase to obtain a second extraction organic phase and a second raffinate; the second raffinate is subjected to Co extraction, Mg extraction and evaporative crystallization, and nickel sulfate is obtained; and the organic phase obtained after Co extraction is subjected to back extraction and evaporative crystallization, and cobalt sulfate is obtained. Compared with a traditional doubling treatment technology, the doubling treatment method avoids the problem of impurity pollution caused by doubling treatment of traditional battery black powder and nickel cobalt hydroxide raw materials.

The invention relates to a method for recovering nickel and cobalt from a mixture of compounds of these metals from the recycling of spent lithium-ion batteries, comprising the following steps: a) digestion of a mixture of nickel and cobalt compounds in a solution containing hydrochloric acid having a concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is solid; or bringing the mixture of nickel and cobalt compounds to a hydrochloric acid concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is a solution; b) activation of ion-exchange resin in a column using hydrochloric acid; c) passing the solution from step a) through the column filled with the ion-exchange resin activated in step b); d) washing the column with hydrochloric acid having a concentration of more than 25 mass % in order to wash out the remaining solution containing nickel ions; e) washing the column with hydrochloric acid having a concentration of less than 10 mass % in order to wash out cobalt ions; f) extraction distillation of the nickel ion solution obtained in step d) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of nickel sulfate(VI) and electrolysis in order to recover metallic nickel; g) extraction distillation of the cobalt ion solution obtained in step e) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of cobalt sulfate(VI) and electrolysis in order to recover metallic cobalt; h) extraction distillation of the solution of diluted hydrochloric acid with nickel and cobalt ions obtained after the activation of the ion-exchange resin in step b), using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; recycling of a mixture of the formed cobalt sulfate(VI) and nickel sulfate(VI) to digestion in step a); i) rectification of diluted hydrochloric acid having a concentration below the azeotropic concentration (approx. 20.2 mass % at atmospheric pressure) formed in extraction distillation processes in steps f)-h) in order to concentrate hydrochloric acid and recover and recycle of water; recycling of concentrated hydrochloric acid to extraction distillation in steps f)-h).

The invention discloses a crystalline-amorphous composite self-supporting material which is prepared by the following steps: taking foamed nickel NF as a substrate, taking copper sulfate pentahydrate, urea and ammonium fluoride as raw materials for hydrothermal reaction, obtaining NF / Cu-Cu2O through a hydrothermal method, then taking nickel sulfate hexahydrate, cobalt sulfate heptahydrate, sodium citrate and thiourea as raw materials for electrodeposition, and preparing NF / Cu-CuS2 / NiCoS through an electrochemical deposition method; the NF is used as a self-supporting framework; cu-CuS2 is of a flaky hydrangea structure, the diameter of the Cu-CuS2 is 10 microns, NiCoS is of a nano spherical structure, and the diameter of the NiCoS is 10 nm; niCoS nanospheres grow on the sheet layer of the hydrangea structure; cu and CuS2 are in a crystalline state, and NiCoS is in an amorphous state. The preparation method comprises the following steps: 1, preparing NF / Cu-Cu2O; and 2, the NF / Cu-CuS2 / NiCoS is prepared. When the composite material is used as a hydrogen evolution catalyst material, the overpotential is 39-42 mV and the Tafel slope is 130-136 mV.dec-1 within the range of 0-1.2 V and when the current density is 10 mA. Cm <-2 >; and under the conditions that the current density is 10mA. Cm <-2 > and the cycle time is 24h, the current retention rate is 95-98%.

The invention provides a treatment method of nickel-cobalt hydroxide, which comprises the following steps of: leaching the nickel-cobalt hydroxide by using a leaching agent containing ionic liquid and chloride, and filtering to obtain leachate and leaching residues; adding iron powder or manganese powder into the leachate to remove copper, and filtering to obtain copper sponge and copper-removed liquid; adding an alkaline regulator into the copper-removed liquid, and filtering to obtain iron and aluminum-removed liquid and iron and aluminum slag; carrying out counter-current extraction on the iron and aluminum removed liquid and P204 to obtain manganese-rich organic liquid and manganese extraction residual liquid; carrying out reverse extraction on the manganese-rich organic liquid with dilute sulfuric acid to obtain a manganese sulfate solution, wherein the manganese sulfate solution is used for preparing a ternary precursor or manganous-manganic oxide; carrying out countercurrent extraction on the manganese extraction raffinate and the co-extraction organic solvent to obtain a nickel-cobalt-loaded organic solvent and raffinate; carrying out reverse extraction on the nickel-cobalt-loaded organic solvent by dilute sulfuric acid to obtain a nickel-cobalt sulfate solution; the nickel-cobalt sulfate solution is used for preparing the ternary precursor after being deoiled. The nickel-cobalt hydroxide treatment method provided by the invention is low in auxiliary material consumption, low in treatment cost, green and environment-friendly.

The invention relates to the technical field of lithium battery recovery, in particular to a method for producing cobalt oxide by recovering waste lithium batteries and recycling mother liquor in the production process. Comprising the following steps of lithium cobalt oxide battery disassembly and pretreatment, valuable metal leaching, extraction separation, hydroxyl cobalt oxide production and mother liquor recycling treatment. Citric acid and hydrogen peroxide are used as valuable metal leaching agents, efficient leaching of valuable metal such as lithium and cobalt can be achieved, dependence on strong acid is reduced, and safety risks and environmental pollution in the recovery process are reduced. The cobalt sulfate solution obtained by recycling the waste lithium cobalt oxide batteries is used for producing and preparing the hydroxyl cobalt oxide, after the hydroxyl cobalt oxide is obtained, the residual mother liquor contains a sodium hydroxide component, the mother liquor is subjected to impurity removal treatment, the recyclable alkali liquor can be obtained, the recyclable alkali liquor can be used as saponification liquid alkali to be used in the extraction separation step, resource waste is reduced, and the resource utilization rate is increased. The resource recycling rate is improved.

The invention relates to the technical field of positive electrode precursors, in particular to a method for preparing a sulfate solution for a precursor by using a cobalt nickel hydroxide intermediate product and application of the sulfate solution. Performing acid leaching on the intermediate product, and then adding a flocculating agent to obtain a cobalt-nickel-manganese mixed solution and manganese slag; extracting the cobalt-nickel-manganese mixed solution and P507-C272, and reversely extracting a loaded organic phase to obtain a crude manganese sulfate solution; performing P204 impurity removal on the raffinate, recovering cobalt by using P507 to obtain a cobalt sulfate solution, and performing C272 nickel-magnesium separation to obtain a nickel sulfate solution; manganese slag is subjected to reduction leaching to obtain reduction leaching liquid, and then the reduction leaching liquid is mixed with a sodium carbonate solution to remove iron to obtain iron-removed liquid; mixing the iron-removed solution with the crude manganese sulfate solution, and removing calcium and magnesium to obtain a calcium-magnesium-removed solution; mixing the calcium and magnesium removed solution with an aluminum source to remove fluorine to obtain a fluorine removed solution; and mixing the fluorine-removed solution with sulfide to remove copper and zinc, adding alkali liquor to obtain a heavy-removed solution, and treating the heavy-removed solution with modified resin to obtain a refined manganese sulfate solution. The method is high in manganese recovery rate and low in treatment cost.

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 provides a method for comprehensively recovering lithium and cobalt from the cathode material of waste lithium cobalt oxide batteries, comprising the following steps: (1) Pretreating the cathode material of waste lithium cobalt oxide batteries to obtain lithium cobalt oxide cathode active material; mixing the lithium cobalt oxide cathode active material evenly with a sulfur-based compound and a carbon source to obtain a mixed material; subjecting the mixed material to roasting in an inert atmosphere, grinding, leaching, and filtering in sequence to obtain a lithium-containing solution and a sulfur-containing filter residue; (2) Subjecting the sulfur-containing filter residue to acid leaching for impurity removal and filtering to obtain cobalt sulfide slag; (3) Roasting the cobalt sulfide slag in an oxygen atmosphere to obtain a roasted product; (4) Subjecting the roasted product to leaching and filtering to obtain a cobalt sulfate solution and cobalt tetroxide. The method of the present invention can obtain soluble sulfates and high-purity cobalt oxides, and has a short process flow, low cost, and high lithium selectivity.

The invention belongs to the technical field of hydrometallurgy, and discloses a method for preparing nickel sulfate and cobalt sulfate from nickel feed liquid. The method comprises the following steps: 1) carrying out first extraction on the nickel feed liquid by using a nickel-cobalt extraction agent to obtain a first organic phase and first raffinate; 2) washing the first organic phase with a first washing solution, wherein the first washing solution comprises sulfuric acid and nickel sulfate; (3) the washed first organic phase is subjected to reverse extraction, and a first regenerated organic extraction agent and nickel-cobalt enrichment liquid are obtained; 4) performing second extraction on the nickel-cobalt enriched liquid by using an impurity extracting agent to obtain a second organic phase and a mixed solution of nickel sulfate and cobalt sulfate; 5) washing the second organic phase by using a sulfuric acid solution, and 6) carrying out reverse extraction on the washed second organic phase to obtain a reverse extraction solution and a second regenerated organic extracting.By adopting the method provided by the invention, nickel and cobalt enrichment can be realized from the high-calcium-magnesium solution, impurity ions can be effectively removed, the process is simple, and the cost is low.

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 relates to a method for synthesizing menadione through in-tank indirect electrooxidation of 2-methylnaphthalene. Metal titanium is used as a substrate, a Sn-Ir-doped titanium-based PbO2 electrode is prepared by adopting a coating method and is used as an electrolytic anode, and a Pb electrode is used as a cathode. 2-methylnaphthalene, a solvent, cobaltous sulfate, sulfuric acid, ammonium sulfate, an electrocatalyst and water are prepared into anolyte according to a certain proportion, a sulfuric acid aqueous solution serves as catholyte, an oil-water two-phase reaction solution is obtained from an anode in a two-phase electrolysis mode, an oil phase is directly refined to obtain menadione, and a water phase is reused after being refined. The method is short in technological process, few in three wastes, mild in condition and extremely low in cost, and has extremely high industrialization prospects.

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 discloses a method for separating positive and negative electrode powder. The method comprises the following steps: S1, crushing and drying a waste ternary lithium battery, and winnowing to remove a shell and a diaphragm to obtain a mixture; s2, calcining the mixture in an inert gas atmosphere, and then performing magnetic separation to separate magnetic substances from non-magnetic substances; s3, separating a magnetic substance by wet stripping to separate the positive electrode foil from the positive electrode powder; separating non-magnetic substances by wet stripping, so that the negative electrode foil is separated from the negative electrode powder; s4, dissolving the positive electrode powder in the solution A, adding nickel sulfate, cobalt sulfate and manganese sulfate, uniformly mixing to obtain a solution B, then uniformly mixing the solution B with a sodium carbonate aqueous solution, adjusting the pH value to 8-8.5 by using ammonia water, carrying out a hydrothermal reaction, and collecting a precipitate; uniformly mixing the precipitate with lithium carbonate and zirconium hydroxide, and performing primary sintering to obtain an intermediate material; and uniformly mixing the intermediate material with ammonium molybdate tetrahydrate, and carrying out secondary sintering to obtain the modified positive electrode material.

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 invention discloses a high-stability electroplating solution based on ultrapure cobaltous sulfate, a preparation method and application, and the high-stability electroplating solution comprises the following raw materials: 200-300g / L of ultrapure cobaltous sulfate which meets the requirement that the total amount of impurities is less than 10ppm; 30-50 g / L of ultrapure boric acid; 5-10 g / L of a complexing agent; 0.1 g / L to 0.5 g / L of a brightening agent; and the pH is regulated to 3.5-4.5 by using a pH regulator. By optimizing the composition formula of the electroplating liquid, the technical scheme of ultralow impurity content is realized, so that the binding force, porosity and the like of a plating layer are remarkably improved, and the corrosion resistance is greatly improved.