65 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.

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 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.

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 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.

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 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.

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.

The invention discloses a small-particle-size basic cobalt carbonate synthesis process in the technical field of inorganic functional materials, and the process is characterized in that firstly, surface-engineered gadolinium-doped cerium oxide nanoparticles are prepared as an inorganic modifier, and the modifier is prepared through the steps of coprecipitation, hydrothermal treatment, surface phosphorylation, reduction heat treatment and the like. In the synthesis of basic cobalt carbonate, the modifier is dispersed in water to form a turbid liquid, then cobaltous sulfate and a sodium bicarbonate solution are added into the turbid liquid in a parallel flow manner at a mild temperature to carry out a precipitation reaction, and nucleation and growth processes are regulated and controlled by accurately controlling the pH value of a reaction system; and finally, adjusting the terminal pH value by using a sodium carbonate solution, aging, separating, washing and drying to obtain a final product. Through the synergistic effect of the unique inorganic modifier and the double precipitants, high-yield preparation of the basic cobalt carbonate with small particle size, good sphericity degree and high purity under mild conditions is realized, the process is simple, and industrial production is easy to realize.

The invention discloses a nickel-molybdenum-cobalt-boron alloy coating with a nanocrystalline structure and a preparation method of the nickel-molybdenum-cobalt-boron alloy coating, and belongs to the technical field of metal surface treatment. The nickel-molybdenum-cobalt-boron alloy coating with the nanocrystalline structure consists of the following components in atomic percent: 0.01-5% of molybdenum, 7-10% of cobalt, 1-5% of boron and the balance of nickel. The base body is placed in a plating solution, an additive is added, and the nickel-molybdenum-cobalt-boron alloy coating of the nanocrystalline structure is constructed through electrochemical deposition; the plating solution is composed of 60 g / L of nickel sulfate hexahydrate, 1.5 g / L to 5 g / L of sodium molybdate dehydrate, 2 g / L to 4 g / L of cobalt sulfate heptahydrate, 1.5 g / L to 3 g / L of dimethyl borane, 80 g / L to 100 g / L of sodium citrate dehydrate, 20 g / L of nickel chloride hexahydrate, 30 g / L of boric acid and 0.5 g / L to 1 g / L of lauryl sodium sulfate. By adding low-content molybdenum, cobalt and boron solute elements, the grain size can be refined to be 10 nm or below, and therefore the hardness of the nickel-molybdenum-cobalt-boron alloy coating is greatly improved.

The application discloses a method for preferentially extracting lithium from waste lithium ion battery waste materials. First, the waste lithium ion battery waste materials are mixed with composite salt to obtain a mixture, and high-temperature roasting is performed to obtain a roasted clinker. The roasted clinker is leached to obtain a lithium-containing leaching solution and a leaching residue. The leaching residue is subjected to acid leaching, impurity removal and extraction treatment to obtain a nickel sulfate solution and a cobalt sulfate solution. Compared with the prior art, the application uses solid sulfate and calcium-containing substances to replace liquid strong acid, realizes preferential extraction of lithium during roasting, and only needs water leaching to obtain a high-purity lithium-rich solution, thereby realizing efficient separation of lithium and other metals from the source, simplifying the subsequent separation and purification process, and producing leaching residues rich in valuable metals such as nickel and cobalt, which can be used as high-quality metallurgical raw materials, realizing high-value utilization of all components, and having significant industrial application value and economy.

This application belongs to the field of nickel-cobalt hydrometallurgical technology, specifically relating to a method for deep co-purification of nickel and magnesium ions in cobalt sulfate solution, comprising the following steps: S1, obtaining a cobalt sulfate solution containing impurities and two fluorinating agents of equal mass; adding one part of the fluorinating agent to the cobalt sulfate solution to carry out a first reaction to obtain a first mixture; adding the other part of the fluorinating agent to the first mixture to carry out a second reaction to obtain a magnesium-removed liquid; S2, adding boric acid to the magnesium-removed liquid to carry out a third reaction to obtain a fluorine-containing mixed liquid; adding potassium sulfate to the fluorine-containing mixed liquid to carry out a fourth reaction to obtain a fluorine-removed liquid and potassium tetrafluoroborate; S3, using LIX87QN extractant to extract the fluorine-removed liquid to obtain a loaded organic phase and raffinate; back-extracting the loaded organic phase to obtain a nickel-rich solution; and degreasing the raffinate to obtain a high-purity cobalt sulfate solution. This application achieves efficient recovery of cobalt, nickel, and magnesium resources through a staged fluorination-magnesium removal, deep fluorination, and selective nickel extraction synergistic process.

This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. The preparation method consists of the following steps: (1) weighing nickel sulfate and cobalt sulfate and dissolving them in deionized water; (2) dissolving sodium citrate and sodium hypophosphite in deionized water respectively, and then adding them sequentially to the solution obtained in step (1); (3) adjusting the pH of the solution obtained in step (2); (4) cutting the filter paper; (5) preparing a sodium hydroxide solution; (6) placing the cut filter paper in a water bath in the solution prepared in step (5); (7) weighing palladium chloride and sodium borohydride and dissolving them in deionized water at room temperature; (8) activating and then reducing the filter paper in step (6); (9) placing the filter paper obtained in step (8) in a water bath in the solution obtained in step (3) and drying it. This invention reduces overpotential, decreases relative energy consumption, increases catalytic activity, and improves catalyst stability.

The invention discloses a method for deeply removing oil and reducing TOC (total organic carbon) of a sulfuric acid system cobalt electrodeposition solution. According to the method, a cobalt sulfate solution which is produced by a cobalt extraction process and contains 20-40 ppm of oil and 150-300 ppm of TOC is deeply purified by adopting a'regenerated coconut shell activated carbon oil removal column-resin oil removal column-coconut shell activated carbon oil removal column 'three-stage series adsorption process. The method is characterized in that regenerated coconut shell activated carbon with the adsorption performance recovered by 60% or above through a low-cost regeneration process is adopted for primary oil removal, deep adsorption is conducted through an oil removal resin column, finally fine treatment is conducted through a new coconut shell activated carbon column, and the final purification depth is guaranteed through powdered activated carbon. By adopting the method, the coconut shell activated carbon can be recycled for 1-2 times, and the service life of the oil removal resin is prolonged by more than 50%. The technological process is short, the oil content in the solution can be efficiently and stably reduced to 1 ppm or below, TOC can be efficiently and stably reduced to 15 ppm or below, the requirement of cobalt electrodeposition for the extremely high cleanliness of catholyte is met, the quality of electrodeposited cobalt is remarkably improved, and the consumption cost of activated carbon and resin is reduced.

The application discloses a kind of reinforcing high-temperature anaerobic digestion of high-protein organic waste and method of adding auxiliary agent, belong to environmental microbiological technical field.The effective component of the adding auxiliary agent is lysine compound and divalent cobalt soluble salt, the lysine compound is at least one in L-lysine, L-lysine hydrochloride, and the divalent cobalt soluble salt is at least one in cobalt chloride, cobalt nitrate, cobalt sulfate and the hydrate of each.The adding auxiliary agent provided by the application can be directional in mesophilic environment Strengthening methanogenic pathway, improve the hydrolysis acidification of high-protein organic waste and the turnover of volatile fatty acid, significantly improve the methanogenic capacity of mesophilic anaerobic digestion.

The application discloses a method for recovering multiple metals from waste lithium batteries, comprising the following steps: S1. mixing waste lithium battery black powder with a magnesium-containing chlorinating agent, and performing roasting treatment to obtain a roasting product; S2. mixing the roasting product with a weak alkaline leaching agent, and performing leaching treatment, and after filtration, a lithium-containing solution and a filter residue are obtained; S3. adding an ammonia-carbonate-sulfite composite leaching agent to the filter residue to perform ammonia leaching treatment, and after filtration, a nickel-cobalt-rich ammonia complex leaching solution and a manganese-rich solid residue are obtained; S4. sequentially performing heating and extraction treatment on the nickel-cobalt-rich ammonia complex leaching solution, and nickel sulfate and cobalt sulfate are obtained; performing dissolution and precipitation treatment on the manganese-rich solid residue, and a manganese salt is obtained; through the synergistic coupling of magnesium chloride roasting and composite ammonia leaching, lithium is preferentially extracted, and the pre-activation of transition metal phases is realized, so that the inherent contradiction that lithium efficient extraction and nickel-cobalt efficient leaching cannot be achieved simultaneously in the existing process is successfully resolved.

The invention discloses a method for respectively recovering cobalt, zinc and cadmium from thiram slag, which comprises the following steps: (1) adding the thiram slag into an acid leaching solution, introducing air, carrying out cobalt precipitation reaction, and carrying out solid-liquid separation to obtain a zinc-cadmium solution and cobalt-rich slag; (2) introducing oxygen-enriched air into the cobalt-enriched slag, and carrying out oxidizing roasting to obtain roasted slag; (3) mixing the roasting slag with dilute acid liquor to obtain pickle liquor and cobaltosic oxide slag; (4) blending cobaltosic oxide slag and water into slurry, mixing the slurry with the gas generated in the step (2), and absorbing sulfur dioxide and sulfur trioxide in the gas to obtain a cobalt sulfate solution; (5) adding a cadmium precipitation agent into the zinc-cadmium liquid, adding sodium hydroxide, carrying out selective cadmium precipitation reaction, and carrying out solid-liquid separation to obtain cadmium precipitation slag and zinc-rich liquid; and (6) mixing the cadmium precipitation slag with sodium hydroxide to react, and carrying out solid-liquid separation to obtain cadmium hydroxide precipitation and alkaline leaching liquid. According to the method, efficient selective separation and step-by-step recovery of cobalt, zinc and cadmium in the thiram slag are achieved.

The invention discloses a preparation method of an ammonia-free narrow-distribution lithium-manganese-rich ternary material precursor, which comprises the following specific steps: S1, a mixed salt solution of nickel sulfate, cobalt sulfate and manganese sulfate is prepared according to the molar ratio of 0.3-0.35: 0.02-0.04: 0.6-0.7, and the total molar concentration of three metal ions of nickel, cobalt and manganese in the mixed salt solution is 1-3 mol / L; s2, a NaOH solution with the concentration of 6-10 mol / L and pure water are added into a reaction kettle at a time, then the mixed salt solution is continuously added into the reaction kettle according to the flow rate of 6-10 L / h, and the materials are subjected to a stirring reaction under the condition of 40-80 DEG C; s3, the mixed salt solution and a Na2CO3 solution with the concentration of 3-7 mol / L are mixed according to the proportion of 1: (1-3) and added into the reaction kettle, the pH is maintained to be 8.5-9.5, and the materials are subjected to a stirring reaction at the temperature of 40-80 DEG C. According to the preparation method, on the premise that ammonia water is not added, the pH value is adjusted by adding different alkali liquor, so that the lithium-manganese-rich ternary precursor which is good in sphericity degree, uniform in particle and large in specific surface area is prepared.

This application provides a method for recovering cobalt from a cobalt-containing solution in a hydrometallurgical zinc smelting process, relating to the field of hydrometallurgy. The method includes: reacting the cobalt-containing solution with an organic ligand and an oxidant to obtain a cobalt-precipitated liquid and a cobalt-containing precipitate; subjecting the cobalt-containing precipitate to a liquid-phase conversion treatment under closed conditions to obtain a cobalt-rich intermediate; mixing the cobalt-rich intermediate with dilute sulfuric acid to obtain a cobalt-rich solution; extracting the cobalt-rich solution with an extractant to obtain a purified cobalt solution; and using the purified cobalt solution to prepare a cobalt-containing product, which includes at least one of cobalt sulfate, cobalt tetroxide, and metallic cobalt. This application enables efficient separation and extraction of cobalt from a cobalt-containing solution in a hydrometallurgical zinc smelting process and can prepare high-value-added cobalt-containing products. The overall cobalt recovery rate of this application is greater than 93%, and the purity of the cobalt-containing product can reach over 99.5%. This application achieves efficient and high-value utilization of cobalt resources in the hydrometallurgical zinc smelting process.

The invention belongs to the technical field of phosphorus removal, and particularly relates to a deep phosphorus removal method for multi-stage cooperative treatment of a cobalt sulfate solution. The invention relates to a deep phosphorus removal method for multi-stage cooperative treatment of a cobalt sulfate solution. The deep phosphorus removal method comprises the following steps: S11, pretreatment and primary phosphorus removal; s12, carrying out synergistic extraction; s13, deep purification of the resin; S14, evaporative crystallization: concentrating, crystallizing, filtering and washing the exchanged liquid obtained in the step S13 to obtain cobalt sulfate heptahydrate, and returning the filtered mother liquor to the step S11 for recycling; and S15, recovering phosphorus from the phosphorus-containing liquid. The method disclosed by the invention has the beneficial effects that (1) the impurity phosphorus can be deeply purified, and the phosphorus content of the prepared cobalt sulfate heptahydrate is less than or equal to 0.00003 wt% by adopting a deep phosphorus removal method for multi-stage cooperative treatment of the cobalt sulfate solution; (2) the technological process is mild and easy to popularize and apply; and (3) the solid waste iron slag is subjected to resource utilization, so that solid waste is converted into an intermediate product, and the economic value is improved.

The present invention relates to a method for regenerating a waste precursor for a cathode material of a lithium secondary battery, the method comprising: a first step of preparing a waste precursor solution including a waste precursor sulfate produced by mixing a waste precursor (NCM(OH)2) for a cathode active material including Ni, Co, and Mn with an aqueous leaching solution containing sulfuric acid and a reducing agent; a second step of preparing a transition metal solution including a transition metal sulfate produced by mixing nickel sulfate, cobalt sulfate, and manganese sulfate with water; a third step of preparing a mixed precursor solution by mixing 2.5-4 parts by weight of a transition metal solution with respect to 1 part by weight of the waste precursor solution; a fourth step of introducing an aqueous ammonia solution as a complexing agent into a reactor containing distilled water, and injecting nitrogen gas into the reactor; and a fifth step of supplying the mixed precursor solution and NaOH as a precipitant into the reactor, and precipitating a precursor for a cathode active material by supplying the NaOH at a ratio of 1.8-2.3 moles with respect to 1 mole of the total of the waste precursor sulfate and the transition metal sulfate contained in the mixed precursor solution.