Patent ID: 11929473
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 1:
2. The method of recovering cobalt and nickel according to claim 1, wherein
the acidic solution containing aluminum together with cobalt and nickel is a sulfate solution having a concentration of 1.5 mol/L to 2 mol/L,
the alkaline is sodium hydroxide having a concentration of less than 1 mol/L, pH of the acidic solution being adjusted to pH 5 to 7 by adding the sodium hydroxide to the sulfate solution to produce the hydroxides,
the alkaline solution is a sodium hydroxide solution having a concentration of 4 mol/L to 6 mol/L, the aluminum contained in the hydroxides being leached out by mixing the sodium hydroxide solution to the recovered hydroxides recovered by solid-liquid separation under the liquid condition of pH 8 or more and a liquid temperature of 50° C. to 80° C., and
the cobalt hydroxide and the nickel hydroxide are recovered by the solid-liquid separation on the leachate.