Cobalt ore ball mill grinding to the size of about - 100 mesh, the pulp is beaten to the dissolution tank, dissolved with sulfuric acid or hydrochloric acid, filtrate is pressed, heated, into the hot solution to add sodium carbonate, sodium sulfide, sodium fluoride, sodium thiosulfate and other chemical raw materials as impurity removal agent, remove a large number of copper, iron, calcium, magnesium, lead, lead in the solution. Zinc and other impurities. A small amount of impurities with the solution into the next process, the use of P204 [diisooctyl phosphate] as extractant, cobalt, nickel and copper and iron and other impurities were separated, the extraction solution with dilute hydrochloric acid stripping (elution), cobalt, nickel into the aqueous phase, cobalt, nickel solution into the extraction tank containing P507 [2-ethylhexyl phosphate-2-ethylhexyl ester] cobalt Nickel separation.
Nickel-containing solution is used as a by-product to produce nickel sulfate. The cobalt-containing solution is concentrated to the prescribed concentration and then stripped with hydrochloric acid to form cobalt chloride solution. The cobalt is precipitated with ammonium oxalate and converted to cobalt oxalate precipitation. The precipitate is dried and used as a product in the form of cobalt oxalate. Cobalt oxalate is calcined at high temperature to form cobalt oxide, which is reduced by hydrogen to form cobalt powder. The cobalt solution after separation of cobalt and nickel can be made into cobalt sulphate product if it is eluted with sulphuric acid solution, and cobalt acetate can be made by elution with acetic acid, and cobalt carbonate can be made by precipitation of cobalt chloride solution with sodium carbonate, which can be used to produce cobalt powder, cobalt oxide or cobalt trioxide.