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After the cobalt ore is pulverized by a ball mill to a particle size of about -100 mesh, the slurry is pumped into a dissolution tank, dissolved in sulfuric acid or hydrochloric acid, and then filtered, and the filtrate is heated to add sodium carbonate, sodium sulfide, sodium fluoride, sulfur to the hot solution. A chemical raw material such as sodium sulfate is used as a dopant to remove a large amount of impurities such as copper , iron , calcium, magnesium , lead , and zinc in the solution . With a small amount of impurities into the solution under step, using P 204 [dioctyl phosphate] as the extractant, cobalt, nickel, copper and iron and other impurities was separated, washed with dilute hydrochloric acid and back-extracted extracted (eluted), cobalt Nickel enters the aqueous phase, and the cobalt-containing and nickel-containing solutions are sent to an extraction tank containing P 507 [2-ethylhexylphosphonium-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 predetermined concentration and then stripped with hydrochloric acid to form a cobalt chloride solution. The cobalt is precipitated with ammonium oxalate, converted into cobalt oxalate precipitate, and the precipitate is dried to form cobalt oxalate. The form is used as a product. Cobalt oxalate is calcined at high temperature to form cobalt oxide, which is reduced by hydrogen to form cobalt powder. The cobalt solution separated by cobalt and nickel, if eluted with sulfuric acid solution, can be made into cobalt sulfate product, which can be made into cobalt acetate by elution with acetic acid, and the cobalt chloride solution can be precipitated with sodium carbonate to form cobalt carbonate for production. Cobalt powder, cobalt oxide or tricobalt tetraoxide.