Cobalt oxide powder mainly contains CoO, Co2O3, and Co3O4. High-grade cobalt oxide containing more than 74% cobalt is brown, and cobalt oxide containing 74% or less cobalt is black. According to its use and chemical composition, according to national standards, refined cobalt oxide powder is mainly divided into two series of Y and T, and Y products are divided into three brands of Y0, Y1, and Y2, and T products are divided into T1 and T2. The particle size of refined cobalt oxide powder is generally 180 ~ 250 mesh, and its bulk density is 0.4 ~ 0.61t / m3. Cobalt oxide, whose main component is CoO or Co2O3, is a black-gray powder, which gradually dissolves in hot and hot dilute sulfuric acid, and releases chlorine and oxygen separately. It is insoluble in water and alcohol. Used as oxidant, to produce cobalt and nickel-free cobalt salts, cobalt catalysts, pigments, ceramic glazes, pigments, cemented carbides, used in the electronics and metallurgical industries. Refined cobalt oxide powder is mainly used to make cemented carbide, occupying 93%; part of it is used as pigments and glazes, 4% for ceramics, and 3% for enamel occupations. Cobalt oxalate is calcined at 650 ~ 7500C to produce exquisite cobalt oxide products. Rotary kiln calcination is used for Jinchuan Cobalt system, and the recovery rate of cobalt can reach more than 98%.

Cobalt tetroxide (Co3O4) is a gray-black powdery solid. It is widely used in the production of hard alloys, magnetic materials, enamel pigments, ceramic pigments and glass pigments, so catalysts, ink pigments, and glass decolorants. . Now it is mainly used to produce lithium cobalt battery lithium ion battery material. Because of the development of the communications and electronics industries, China ’s demand for lithium-ion batteries is also increasing. It is estimated that from now to 2010, China ’s demand for lithium-ion batteries will increase at a rate of 10% to 20% per year. At present, China's demand for tricobalt tetroxide is 2600t.

The traditional production methods of tricobalt tetroxide mostly use burning or thermal decomposition. The burning method is to heat cobalt powder to produce CoO by red hot steam heating, and further oxidize it to Co3O4 at 5000C. However, the Co3O4 powder produced by this method has poor activity, low purity and wide particle size distribution. The thermal decomposition method is to deposit pure cobalt oxide or cobalt nitrate solution to produce cobalt oxalate or cobalt carbonate, and calcinate at high temperature to produce Co3O4. However, the method also has the problem of uneven particle size distribution and low product purity.

Production process
After the cobalt ore is destroyed by a ball mill to a size of about -100 mesh, the pulp is beaten into a dissolution tank, filtered with sulfuric acid or dissolved, and the filtrate is heated. Chemical materials such as sodium carbonate, sodium thiosulfate, etc. are added to the hot solution. As an impurity removing agent, a lot of impurities such as copper, iron, calcium, magnesium, lead, and zinc in the solution are removed. A few impurities enter the next process with the solution. P204 [diisooctyl phosphate] is used as an extraction agent to separate the impurity elements such as cobalt, nickel and copper iron. The extraction solution is back-diluted (eluted), and cobalt and nickel enter. In the aqueous phase, cobalt- and nickel-containing solutions were sent to an extraction tank containing P507 [2-ethylhexyl phosphate-2-ethylhexyl ester] for cobalt-nickel separation. The nickel-containing solution is used as a by-product to produce nickel sulfate. The cobalt-containing solution is concentrated to a regular concentration and then back-extracted to generate a cobalt chloride solution. The cobalt is deposited with ammonium oxalate and converted into cobalt oxalate deposits. Use as a product. Cobalt oxalate is calcined at high temperature to produce cobalt oxide, which is reconstituted into cobalt powder. The cobalt solution after cobalt-nickel separation can be made into cobalt sulfate product if it is eluted with sulfuric acid solution, cobalt acetate can be made by elution with acetic acid, and cobalt carbonate solution can be made into cobalt carbonate by sodium carbonate deposition for production. Cobalt powder, cobalt oxide, or tricobalt tetroxide.

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