42results about "Cobalt carbonates" patented technology

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.

A method of manufacturing a particulate transition metal carbonate material is described. The method includes mixing a transition metal precursor salt with a second salt in a liquid vehicle. A precipitation reaction is then performed to form a slurry of the particulate transition metal carbonate material in the liquid vehicle. The particulate transition metal carbonate material may find use as seeds in a subsequent precipitation reaction. Methods of manufacturing a particulate precursor materials are also described, including performing a precipitation reaction between one or more transition metal sources in the presence of seed particles in a reaction mixture within a precipitation reaction vessel, to form the particulate precursor material by precipitation onto the surface of the seed particles.

The application belongs to the technical field of new energy batteries, and particularly relates to a preparation method of aluminum-doped large-particle cobalt carbonate and application thereof. The preparation method of aluminum-doped large-particle cobalt carbonate disclosed by the application first prepares cobalt carbonate seeds, then continues to react after being separated into a kettle, and finally obtains aluminum-doped large-particle cobalt carbonate. By strictly controlling the process and process conditions of seed preparation and subsequent co-precipitation reaction, the uniformity of aluminum doping in cobalt carbonate is greatly improved, the aluminum distribution in the obtained tricobalt tetraoxide after calcination is more uniform, and the electrical performance of lithium ion batteries can be effectively improved. The preparation method of aluminum-doped large-particle cobalt carbonate disclosed by the application strictly controls the seed preparation process and the subsequent reaction process, so that the surface of the prepared cobalt carbonate particles is smoother, there is no segregation, and the sphericity is better, which is beneficial to improving the quality and service life of the final lithium ion battery product.

The application belongs to the technical field of water electrolysis catalysts, and discloses a NiFe-based bifunctional water decomposition electrocatalyst, a preparation method and application thereof, the catalyst is a core-shell heterostructure, a three-dimensional self-supporting NiFe-based OER / HER bifunctional electrocatalyst, specifically, a coral spherical NiFe-LDH coated basic cobalt carbonate nanowire nanomaterial NiFe-LDH@Co-CH / NF with a three-dimensional hierarchical porous core-shell heterostructure; the catalyst is prepared by a two-step method of hydrothermal and solvothermal, and the foam nickel is used as a conductive substrate, the inner layer is the basic cobalt carbonate nanowire, and the outer layer is the NiFe-LDH nanosheet. The catalyst has excellent OER and HER performance, significantly accelerates the diffusion and transfer of the electrolyte solution, excites the synergistic effect and electron transfer, and improves the catalytic activity of the catalyst. The water electrolysis system assembled by the catalyst has excellent water electrolysis performance, and has a wide application prospect.

The invention discloses cobalt carbonate, a preparation method and application, the cobalt carbonate comprises a cobalt carbonate inner core and an aluminum-doped cobalt carbonate coating layer coating the cobalt carbonate inner core, and the pore volume of the cobalt carbonate inner core is smaller than that of the cobalt carbonate. The cobalt carbonate in the application has a synergistic effect between a gradient pore structure and gradient aluminum doping distribution, so that the problem that cobalt carbonate particles are easy to crack and remove powder during sintering is solved, the sintered cobaltosic oxide can be kept to have relatively excellent tap density and mechanical strength, and the electrochemical performance of lithium cobalt oxide is further improved.

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 application provides a gradient washing method of cobalt carbonate, which comprises the following steps: first washing cobalt carbonate by using a washing liquid with a temperature of T1 at a flow rate of v1; then continuing to wash by using a washing liquid with a temperature of T2 at a flow rate of v2, and performing solid-liquid separation after the second washing to obtain washed cobalt carbonate; wherein T2 is less than T1, and v2 is greater than v1. The gradient washing method of cobalt carbonate can not only significantly reduce water consumption and energy consumption in the washing process, realize efficient and uniform removal of impurities, but also can simultaneously maintain the sphericity and surface state of cobalt carbonate particles by the cooperation of high-temperature low-flow and low-temperature high-flow washing.

The present invention belongs to the technical field of lithium ion battery positive electrode materials, and disclosed are a preparation method for a nano lithium cobalt oxide positive electrode mate

The application provides a seed crystal for carbon dioxide fixation, and a preparation method and application thereof, and belongs to the technical field of environmental protection and water treatment. The seed crystal comprises a carrier material and basic active sites loaded on the carrier material; and the material of the basic active sites comprises one or more of alkali metal oxides and alkaline earth metal oxides. The seed crystal provided by the application can be applied to a seed crystal granulation process, the basic active sites on the surface of the seed crystal can consume a large amount of hydrogen ions, accelerate the dissolution and hydrolysis process of gaseous carbon dioxide, convert the gaseous carbon dioxide into carbonate ions in a high-efficient manner, and then induce metal ions to crystallize on the surface of the seed crystal in the form of carbonate precipitation, so that carbonate granules are formed, and the mineralization and fixation of carbon dioxide and the high-efficient removal and granulation recovery of metal ions in wastewater are simultaneously achieved.

A method of manufacturing a particulate precursor material, comprising providing a suspension of seed particles in a liquid vehicle. A precipitation reaction involving one or more transition metal sou

The invention belongs to the technical field of battery positive electrode materials, and relates to a synthesis device and a synthesis method of cobalt carbonate, the synthesis device comprises a first-stage reaction kettle, a second-stage reaction kettle, a first-stage thickener and a second-stage thickener which are sequentially connected along the material flow direction; the discharge hole of the first-stage reaction kettle is communicated with the feed hole of the second-stage reaction kettle through an overflow pipeline; a discharge hole of the second-stage reaction kettle is communicated with a feed hole of the first-stage thickener through an overflow pipeline; an overflow outlet of the first-stage thickener is communicated with a feeding hole of the second-stage thickener; and an overflow outlet of the second-stage thickener is communicated with a reflux inlet of the first-stage reaction kettle through a reflux pipeline. The synthesis device provided by the invention can realize continuous and efficient production, can adapt to synthesis of large-particle-size cobalt carbonate, and improves the stability of the product reaction process, the operation efficiency and the product quality.

The present application relates to a process for purifying metal salts, and to a process for separating a metal from a polymetallic mixture by crystallizing a metal salt. The processes according to the invention allow obtaining crystallized carbonate-containing metal salts with high purity and high crystallinity.

This invention relates to a process for preparing a mixture comprising at least one valuable metallic compound selected from nickel, manganese, and cobalt hydroxides, from a raw material comprising at least one valuable metallic compound and at least one undesirable metallic compound, the process comprising the following steps: - E1: transformation of at least one valuable metallic compound and at least one undesirable metallic compound into the corresponding chloride complexes in an aqueous solution; - E2: selective separation of at least one undesirable metallic complex from at least one valuable metallic complex to obtain an intermediate solution free of undesirable metal complexes; - E3: addition of a sodium hydroxide solution to the intermediate solution to precipitate at least one valuable metallic complex in the form of the corresponding hydroxide compound in a final solution;and - E4: filtration of the final solution to obtain a powder of at least one valuable metallic hydroxide and a sodium chloride solution. Fig. 1;

A method of manufacturing a particulate transition metal carbonate material is described. The method includes mixing a transition metal precursor salt with a second salt in a liquid vehicle. A precipitation reaction is then performed to form a slurry of the particulate transition metal carbonate material in the liquid vehicle. The particulate transition metal carbonate material may find use as seeds in a subsequent precipitation reaction. Methods of manufacturing a particulate precursor materials are also described, including performing a precipitation reaction between one or more transition metal sources in the presence of seed particles in a reaction mixture within a precipitation reaction vessel, to form the particulate precursor material by precipitation onto the surface of the seed particles.

The present disclosure relates to the recovery of waste batteries, and more particularly, to a method of recovering major materials in waste batteries by chemical discharge.

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.

A method of manufacturing a particulate precursor material, comprising providing a suspension of seed particles in a liquid vehicle. A precipitation reaction involving one or more transition metal sou

Disclosed are cobalt(II,III) oxide and a preparation method therefor, lithium cobalt oxide, a positive electrode sheet, and a battery, relating to the technical field of lithium battery positive electrode materials. The cobalt(II,III) oxide has a Dv50, a crystallite size D(111) along the (111) crystal plane, and a specific surface area BET, which satisfy the following relationship: (I), wherein the Dv50 of the cobalt(II,III) oxide is 3 μm-20 μm. The cobalt(II,III) oxide is obtained by pre-sintering and calcining cobalt carbonate having a crystallinity of 30%-80% and a median particle size Dv50 of 3 μm-22 μm.

A method of manufacturing a particulate transition metal carbonate material. A transition metal precursor salt in a liquid vehicle is mixed with a carbonate salt and / or a bicarbonate salt, and a preci

The present invention relates to a method for selectively capturing chemical elements from a multi-metal liquid sample.

The present invention relates to recycling of used batteries, and more specifically, to a method for recovering main materials in used batteries through chemical discharge.

The application discloses a method for recovering cobalt from waste residues in the production of cobalt acetate by a hydrogen peroxide method, and adopts sodium thiocyanate and acetic acid to treat cobalt waste residues to obtain [Co(NCS)4] 2‑ solution, an oxide and unreacted metal cobalt; the obtained unreacted metal cobalt can be directly put into a synthesis kettle to participate in the production of cobalt acetate after being leached by sodium thiocyanate to remove surface impurities; the obtained oxide is reacted with sulfuric acid and hydrogen peroxide to obtain a cobalt sulfate solution; the obtained cobalt sulfate solution and the obtained [Co(NCS)4] 2‑ solution are reacted with sodium carbonate to obtain cobalt carbonate precipitation; the obtained cobalt carbonate precipitation is reacted with an acetic acid solution to obtain a cobalt acetate solution. The application does not produce toxic thiocyanic acid gas, and the sodium thiocyanate can be reused in the recovery process, so that the generation of waste liquid can be reduced, the cobalt recovery rate is high, and economic benefits are good.

The invention discloses a preparation method of aluminum-doped cobalt carbonate and cobaltosic oxide with a high-density shell layer, belongs to the technical field of lithium ion batteries, and solves the problem of performance reduction caused by easy segregation of aluminum element distribution in the existing aluminum-doped cobalt carbonate. The preparation method comprises the following steps: preparing an aluminum-doped CoCl2 solution from a CoCl2 solution and an Al2 (SO4) 3 crystal, adding an NH4HCO3 solution into a reaction kettle as a base solution, synchronously adding the aluminum-doped CoCl2 solution and the NH4HCO3 solution into the reaction kettle, continuously synthesizing until the particle size D50 of aluminum-doped cobalt carbonate reaches 19.0-19.5 microns, and then regulating and controlling the stirring speed, the growth speed and key parameters of free ammonia to obtain the aluminum-doped cobalt carbonate. And continuously synthesizing until the particle size D50 of the aluminum-doped cobalt carbonate reaches 20.1-20.2 mu m, and stopping synthesizing to finally obtain the aluminum-doped cobalt carbonate with a high-density shell layer. The method is convenient to operate and stable in reaction, the segregation phenomenon of the aluminum element in the aluminum-doped cobalt carbonate is prevented by constructing the high-density shell layer outside the aluminum-doped cobalt carbonate, the uniformity of cobalt and aluminum is ensured, the capacity of the high-voltage lithium cobalt oxide material is improved, and the cycle life of the high-voltage lithium cobalt oxide material is prolonged.

The invention provides a core-shell structure cobalt carbonate material and a preparation method and application thereof, and the preparation method comprises the following steps: introducing a first cobalt salt solution, an ammonium bicarbonate solution and a doped metal salt solution into a base solution, and carrying out a first coprecipitation reaction; intermittently feeding a second cobalt salt solution, an ammonium bicarbonate solution and a doped metal salt solution, and carrying out a second coprecipitation reaction to obtain the cobalt carbonate material with the core-shell structure, the concentration of the second cobalt salt solution is smaller than that of the first cobalt salt solution, and the flow of the second cobalt salt solution is smaller than that of the first cobalt salt solution. According to the method, the high-concentration cobalt salt solution is firstly adopted for large-flow feeding, then low-concentration small-flow feeding and intermittent feeding, a doped cobalt carbonate shell which grows uniformly and compactly can be obtained on the surface of an inner core, agglomeration and segregation of doped elements can be inhibited, side reaction of particles and electrolyte can also be prevented, and the service life of the electrolyte is prolonged. Cracks generated by material strain in the charging and discharging process are reduced, and the cycling stability and other performance of the material are improved.

This invention relates to the field of wet synthesis technology of lithium cobalt oxide precursors, specifically to an automatic control system for synthesizing large-particle-size cobalt carbonate. This system addresses the problems of high labor intensity for operators, delayed pH / ammonia concentration detection, and large particle size detection errors in the current synthesis of large-particle-size cobalt carbonate, ultimately reducing the overall efficiency of the synthesis. The system consists of a reaction vessel, a pH / ammonia concentration composite probe, a particle size analyzer, a mold temperature controller, a batch valve assembly, and a DCS control station. It achieves closed-loop particle size control, automatic batch separation, and batch management through a multi-parameter coupling model of particle size, expansion rate, and time, and a batch separation model. The DCS system monitors and automatically adjusts parameters such as temperature, pH / ammonia concentration, solid content, and particle size in real time, eliminating the need for manual intervention throughout the process. This significantly improves the batch consistency of large-particle-size cobalt carbonate, ensures controllable particle size, greatly reduces the labor intensity of operators, and guarantees the unmanned and digitalized production requirements for cobalt carbonate synthesis.

The invention discloses a high-specific-surface small-particle carbonate system undoped cobaltosic oxide synthesis method, which comprises: under a stirring state, adding a cobalt salt solution and a precipitant aqueous solution to an alkaline base solution in a parallel flow manner, controlling the pH value of a reaction system to be neutral, and carrying out a synthesis reaction until cobalt carbonate particles grow to a target particle size, slurry containing cobalt carbonate particles is obtained; carrying out demagnetization treatment on the slurry, and then carrying out filter pressing, washing and purging to obtain a semi-dry material; and calcining the semi-dry material to obtain the undoped cobaltosic oxide. According to the preparation method, the cobaltosic oxide with high specific surface area and small particle characteristics is prepared by optimizing the synthesis process and parameters on the premise of not depending on element doping, and the obtained cobaltosic oxide product has an excellent microstructure which is compact in structure, free of cracks and good in sphericity degree; therefore, the comprehensive performance advantages of high tap density, high specific surface area and low sodium content are embodied, and the improvement of the charge-discharge capacity and cycle stability of the battery is facilitated.

The invention discloses a preparation method of aluminum-doped small-particle-size cobalt carbonate, belongs to the technical field of lithium ion batteries, and solves the problems that the aluminum element in the existing aluminum-doped small-particle-size cobalt carbonate is easy to recrystallize and separate out, and the particle morphology is difficult to control. The preparation method comprises the following steps: preparing a cobalt-aluminum mixed solution, adding an NH4HCO3 solution into a reaction kettle to serve as a base solution, starting the reaction kettle for heating, adding the cobalt-aluminum solution and the NH4HCO3 solution for precipitation reaction until the particle size D50 of aluminum-doped cobalt carbonate reaches 3.7-3.8 mu m, ending the first reaction and the second reaction until the particle size of the material in the reaction kettle grows to 4.0-4.5 mu m, ending the second reaction, and cooling to room temperature to obtain the cobalt-aluminum composite material. And carrying out a third reaction until the particle size of the aluminum-doped cobalt carbonate grows to 4.0-5.0 [mu] m, washing, and drying to obtain the aluminum-doped small-particle-size cobalt carbonate. The method is convenient to operate and stable in reaction, cooperative control over distribution uniformity and structural integrity of the aluminum element in the aluminum-doped small-particle-size cobalt carbonate particles is ensured, hydrolysis and recrystallization are avoided, and no aluminum segregation substance exists on the surfaces of the aluminum-doped small-particle-size cobalt carbonate particles.

The invention discloses a synthesis process of basic cobalt carbonate in the field of inorganic material synthesis, which comprises the following steps: respectively preparing cobalt salt and sodium bicarbonate into solutions, dropwise adding the cobalt salt solution into the sodium bicarbonate solution at a specific temperature, adding a self-made modified material, aging, filtering, washing and drying to obtain high-purity basic cobalt carbonate. The preparation process of the modified material comprises the following steps: taking cobalt chloride and zinc chloride as metal sources to react with an organic ligand in a methanol solution to form a precursor, and performing high-temperature pyrolysis on the precursor in an inert atmosphere to obtain a carbon-based composite material, carrying out surface functionalization through vapor deposition doping; and finally, carrying out electrochemical activation treatment to obtain a final product. The modified material can effectively regulate and control nucleation and growth of basic cobalt carbonate crystals, the method is simple in process, low in cost and environmentally friendly, and the obtained product is high in purity, uniform in morphology and suitable for battery materials and catalyst precursors.

The invention belongs to the technical field of lithium ion batteries, and relates to doped cobalt carbonate as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a cobalt-aluminum mixed salt solution, a zinc salt solution and a precipitant solution in a parallel flow manner, and sequentially carrying out a nucleation period coprecipitation reaction and a particle growth period coprecipitation reaction to obtain doped cobalt carbonate; the cobalt-aluminum mixed salt solution comprises cobalt salt, aluminum salt, a complexing agent and a solvent; the reaction temperature of the coprecipitation reaction in the nucleation period is lower than that of the coprecipitation reaction in the particle growth period. According to the invention, aluminum and zinc are adopted for bulk phase doping of cobalt carbonate, a complexing agent is additionally added, and the reaction temperatures of different co-precipitation reaction stages are regulated and controlled, so that uniform distribution of aluminum and zinc in cobalt carbonate is realized, and in the lithium cobalt oxide positive electrode material finally obtained from cobalt carbonate, aluminum and zinc cooperate with each other, so that the lithium cobalt oxide positive electrode material has good electrochemical performance. The lattice stability of the material is stabilized, the layered structure of lithium cobalt oxide is stabilized, lattice slippage is inhibited, and the capacity and cycle performance of the battery are improved.

This invention discloses a method for treating wastewater from cobalt carbonate production and a method for producing cobalt carbonate, solving the technical problems of high energy consumption and high impurity levels of ammonium chloride salts in existing technologies. The method for treating wastewater from cobalt carbonate production includes the following steps: Step 10, pretreating the mother liquor to reduce its suspended solids (SS) content and pH, obtaining a clear mother liquor; Step 20, pretreating the wash water to reduce its SS content and pH, obtaining washing water; Step 30, concentrating a first mixture containing washing water and condensate to obtain a first concentrated water with high TDS content and a first product water with low TDS content; Step 40, evaporating and crystallizing a second mixture containing the first concentrated water and clear mother liquor to obtain condensate and ammonium chloride salts; Step 50, concentrating the first product water to obtain a second concentrated water with high TDS content and a second product water with low TDS content; the second product water is recycled to the washing process in cobalt carbonate production; the second concentrated water is recycled.