9 results about "Cobalt sulphate" patented technology

The invention provides a method for comprehensively recovering lithium and cobalt from a waste lithium cobalt oxide battery positive electrode material, which comprises the following steps: (1) pretreating the waste lithium cobalt oxide battery positive electrode material to obtain a lithium cobalt oxide positive electrode active material; uniformly mixing the lithium cobalt oxide positive active material with a sulfenyl compound and a carbon source to obtain a mixture; the mixture is subjected to inert atmosphere roasting, grinding, leaching and filtering in sequence, and a lithium-containing solution and sulfur-containing filter residues are obtained; (2) carrying out acid leaching impurity removal on the sulfur-containing filter residues, and filtering to obtain cobalt sulfide residues; (3) roasting the cobalt sulfide slag in an oxygen atmosphere to obtain a roasted product; and (4) the roasted product is leached and filtered, and a cobalt sulfate solution and cobaltosic oxide are obtained. According to the method, soluble sulfate and high-purity cobalt oxide can be obtained, and the method is short in process, low in cost and high in lithium selectivity.

The present invention provides a process for the batch preparation of a nickel or cobalt sulphate solution in a reactor, whereby metal particles containing nickel or cobalt, respectively, are reacted with sulphuric acid, and whereby hydrogen peroxide is added until the sulphuric acid is sufficiently depleted.

The application discloses a cobalt sulfide / titanium carbide / carbon cloth composite anode material and a preparation method and application thereof. In order to solve the problems of the existing anode material, such as low efficiency of activating persulfate, limited electron transmission efficiency, difficulty in generating non-radicals, and complex preparation process of titanium carbide material and other materials, the application uses anhydrous ethanol and dimethylformamide as organic solvents, which can improve the solubility and dispersity of the titanium carbide material in the organic solvents and is beneficial to the generation of high-purity metal sulfide in a suitable proportion. Meanwhile, the application realizes the growth of the titanium carbide and the cobalt sulfide on the carbon cloth substrate by using a one-step solvothermal method under high temperature and high pressure, makes the cobalt sulfide grow on the surface and between the layers of the titanium carbide without changing the layered structure of the titanium carbide, and obtains the cobalt sulfide-titanium carbide-carbon cloth composite anode material, which is beneficial to the high-speed electron transmission on the electrode surface under the electric field and the generation of non-radicals. The application belongs to the technical field of electrocatalytic materials.

The application provides a method for calculating the specific surface area of nanometer cobalt hydroxide, and belongs to the technical field of lithium ion battery material preparation, and solves the problem of difficult accurate adjustment of the specific surface area of nanometer cobalt hydroxide, wherein the application uses cobalt sulfate as raw material to prepare solution A and solution B; the prepared solution is subjected to nanometer cobalt hydroxide synthesis reaction; then the synthesized slurry is aged, washed, dried and airflow broken to obtain nanometer cobalt hydroxide product; the concentration of sodium hydroxide, the synthesis temperature range, the specific surface area of the prepared nanometer cobalt hydroxide, the negative linear relationship and the numerical relationship between the concentration of the sodium hydroxide solution, the synthesis temperature and the specific surface area of the nanometer cobalt hydroxide are set. By adjusting the concentration of the sodium hydroxide solution and the synthesis temperature during the wet synthesis of nanometer cobalt hydroxide, the specific surface area of the nanometer cobalt hydroxide can be accurately adjusted within a range, and the control precision reaches the theoretical requirement.

The invention discloses a non-combustible fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) preparing a polyacrylonitrile spinning solution: mixing acrylonitrile, a second comonomer, dibutyl itaconate and an initiator, then carrying out polymerization reaction, and then carrying out filtration, monomer removal and defoaming treatment to obtain the polyacrylonitrile spinning solution; the second comonomer is an N-vinyl amide monomer; and (2) preparing the non-combustible fiber: carrying out spinning treatment on the polyacrylonitrile spinning solution to obtain a polyacrylonitrile precursor, soaking the precursor in a cobaltous sulfate solution with the mass concentration of 5% for 5-10 minutes, then soaking the precursor in the soaking pretreatment solution for 10-15 minutes, and carrying out pre-oxidation treatment on the soaked precursor by adopting a gradient heating mode to obtain the non-combustible fiber. The elongation at break of the non-combustible fiber prepared by the method is higher than 22%, and the non-combustible fiber has high tensile strength, excellent fiber characteristics and extremely high incombustibility and can be processed into non-combustible fabric, so that the application field of the non-combustible fiber is widened.

The invention provides a novel cobalt electroplating additive and application thereof in cobalt electroplating, and belongs to the technical field of electroplating, and the electroplating process comprises the following steps: preparing an electroplating solution: weighing cobalt sulfate heptahydrate, cobalt chloride hexahydrate and boric acid, dissolving the materials in deionized water, fully stirring until the materials are uniform, then adding the novel cobalt electroplating additive, and uniformly stirring to obtain the electroplating solution; the final electroplating liquid is obtained; carrying out pretreatment on the blind hole electroplating plate; treating the cobalt anode plate; and the electroplating process comprises the steps that a treated blind hole electroplating plate serves as a cathode, a cobalt plate serves as an anode, the cathode and the anode are put into the electroplating liquid prepared in the step (1) together, a power source is switched on, the current and the electroplating time are set, and the electroplating process is completed. According to the novel electroplating cobalt additive, through precise regulation and control of cobalt deposition kinetics, the over-deposition phenomenon at an opening is remarkably inhibited, and the occurrence rate of shrinkage cavity defects is synchronously reduced, so that the uniformity and reliability of an interconnection structure are improved.

The invention belongs to the technical field of superhard material products, and particularly discloses a method for quickly preparing an electroplated diamond fretsaw, which comprises the following steps of: firstly, carrying out surface nickel plating on diamond micro powder with the granularity of 22-36 microns by using a pre-prepared chemical plating solution, and then carrying out oil removal, erosion, drying and magnetization treatment on a metal matrix, thereby obtaining the electroplated diamond fretsaw. The method comprises the steps that firstly, a metal substrate is placed in a prepared electroplating bath containing cobalt sulfate hexahydrate and 1, 4-butynediol, current of 5 A / dm < 2 > is introduced, preplating is conducted for 2 min, then sand feeding and nickel plating are conducted on the metal substrate, current of 5 A / dm < 2 > is introduced in the sand feeding and nickel plating link, sand feeding is conducted for 30 s, the current density is increased to 14 A / dm < 2 >, thickening treatment is conducted for 10 min, and finally packaging is conducted after drying and quality inspection. The electroplating efficiency of the diamond fretsaw can be effectively improved.

A preparation method of the MAB phase coating coated carbon fiber comprises the following steps: sequentially treating the carbon fiber by adopting concentrated nitric acid, a sensitizing solution and an activating solution, soaking the treated carbon fiber in a chemical plating solution for plating, sequentially cleaning and drying the plated carbon fiber, then heating to 700-1200 DEG C in an inert atmosphere, and carrying out heat treatment for at least 0.5 h, so as to obtain the MAB phase coating coated carbon fiber. The MAB phase coating coated carbon fiber is obtained; the chemical plating solution comprises the following components: 21 g / L of cobalt sulfate, 5-23 g / L of sodium tungstate, 2-4 g / L of dimethylamino borane, 20-30 g / L of sodium citrate and deionized water as a solvent. The MAB-phase coating coated carbon fiber can effectively inhibit high-temperature oxidative damage of the carbon fiber, and the preparation method is simpler and more convenient to operate, lower in cost, shorter in period and convenient for industrial application.

A method for preparing high-purity mixed nickel and cobalt sulphate, the method comprising the recovery of nickel and cobalt sulphate crystals from an organic phase rich in both nickel and cobalt by way of contacting the nickel and cobalt rich organic phase with an aqueous strip solution of sufficient H2SO4 concentration to extract nickel and cobalt from the organic phase and of sufficient Ni2+ and Co2+ concentration to precipitate nickel and cobalt sulphate crystals and form a nickel and cobalt lean organic phase. Also disclosed is a method for the optimisation of feed for downstream processing.