56results 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.

The invention provides a cobalt-based catalyst and a preparation method and application thereof, the chemical formula of the cobalt-based catalyst is Co (OH) x (CO3) 1-0.5 x, x is not higher than 2, and the cobalt-based catalyst has a nanofiber three-dimensional network structure. The cobalt-based catalyst provided by the invention has a nanofiber three-dimensional network structure, and the agglomeration phenomenon is greatly improved, so that the cobalt-based catalyst has a relatively high specific surface area, more active sites can be exposed, and the cobalt-based catalyst has excellent catalytic performance.

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 application provides an aluminum-manganese-nickel co-doped cobalt carbonate precursor and a preparation method and use thereof. The preparation method comprises the following steps: mixing a cobalt-aluminum mixed salt solution, a manganese salt solution, a nickel salt solution and a precipitant solution, and performing a co-precipitation reaction to obtain the aluminum-manganese-nickel co-doped cobalt carbonate precursor; wherein the cobalt-aluminum mixed salt solution comprises a complexing agent; the manganese salt solution comprises a first surfactant and a second surfactant, the first surfactant comprises a crown ether surfactant, and the second surfactant comprises a non-ionic surfactant. The preparation method provided by the application realizes uniform doping of aluminum, manganese and nickel in the cobalt carbonate precursor material, not only reduces the risk of low capacity caused by only increasing the aluminum content, but also reduces the risk of small particle explosion in the reaction process, so that the obtained tricobalt tetraoxide precursor material has uniform particle size and uniform distribution of doped elements.

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 invention provides a method for recycling a waste lithium ion battery positive electrode material through carbon dioxide laser thermal irradiation, and relates to the technical field of lithium ion battery recycling. The method for recycling the positive electrode material of the waste lithium ion battery through carbon dioxide laser thermal irradiation comprises the following steps: paving and fixing a positive electrode plate of the waste lithium ion battery on a glass plate, and scanning the positive electrode plate by adopting carbon dioxide laser; and after laser irradiation, active substances on the positive plate of the waste lithium ion battery are separated from the current collector aluminum foil. The collected active substances are ground and then dispersed in a low-concentration acid solution to be leached, and then a solution containing Li < + >, Co < 2 + >, Ni < 2 + > and Mn < 2 + > is obtained. The technical effects of improving the metal recovery efficiency and reducing the environmental pollution can be achieved by treating the waste positive plate through laser irradiation.

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.

The invention relates to the technical field of cobalt powder preparation, in particular to a method for preparing a submicron cobalt carbonate precursor for superfine cobalt powder through a three-step sectional type synthesis method. The synthesis method of the cobalt carbonate for preparing the superfine cobalt powder comprises the following steps: (a) forward dropwise adding: dropwise adding a cobalt salt solution into a precipitant solution, uniformly stirring and completely reacting, and controlling the pH value to 6.7-6.9 to obtain a front cobalt carbonate solution; (b) cocurrent flow coprecipitation: simultaneously adding a cobalt salt solution and a precipitant solution into the front cobalt carbonate solution prepared in the step (a) at a constant speed to react, and then controlling the pH value to 6.7-6.9 to obtain a rear cobalt carbonate solution with uniformly grown particles; and (c) aging: aging the cobalt carbonate solution obtained in the step (b). According to the method, the synthesized cobalt carbonate is small in particle size, regular in shape and uniform in particle size distribution, so that a high-quality raw material is provided for preparing high-quality superfine cobalt powder.

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 invention provides cobaltosic oxide, cobalt carbonate, a preparation method of the cobaltosic oxide and the cobalt carbonate and a lithium cobalt oxide positive electrode material, and relates to the technical field of battery materials. The cobaltosic oxide has a core-shell structure, and an inner core and a shell layer of the cobaltosic oxide have the same element composition; the thickness of the shell layer of the cobaltosic oxide is 0.08 to 0.16 [mu] m; the cobaltosic oxide contains a doping element, and the difference value between the ion radius of the doping element and the radius of Co < 2 + > is 5-10 pm; and the particle size variation D50 of the cobaltosic oxide subjected to 0.75 T pressing is less than 1.8 mu m. The cobaltosic oxide is good in structural stability, the morphology is kept complete after lithium doping, the problem of particle crushing or pulverization caused by volume expansion and shrinkage is avoided, particles are in closer contact during electrode coating, the interface impedance is reduced, and the polarization phenomenon in the charging and discharging process is reduced.

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 present invention discloses a cationic aluminum-doped basic cobalt carbonate hexagonal prism and a preparation method thereof. The preparation method comprises injecting a mixed solution of cobalt salt and aluminum salt, a cation-containing salt solution, and a second precipitant solution into a first precipitant solution by continuous feeding to obtain a mixed system; the mixed system is continuously reacted, and when the product grows to a desired length, the cationic aluminum-doped basic cobalt carbonate hexagonal prism is collected to obtain the cationic aluminum-doped basic cobalt carbonate hexagonal prism. The present invention does not require the addition of additional complexing agents and surfactants for regulation, but instead uses cations to regulate the morphology of basic cobalt carbonate under continuous feeding, successfully preparing basic cobalt carbonate hexagonal prisms. The reaction process is simple, with few control conditions and few exogenous additives, resulting in a product with high purity and strong repeatability, which is very suitable for industrial large-scale production. At the same time, based on the unique structure of the cationic aluminum-doped basic cobalt carbonate hexagonal prism, it has great potential application value.

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.