Patent ID: 11926882
Assignee: KOREA ZINC CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  Y | IPC C

Claim 10:
11. A method for producing an aqueous solution containing nickel or cobalt comprising:
(A) a leaching step, which includes a first atmospheric pressure heating leaching step and a second atmospheric pressure heating leaching step, in which a raw material is heated and leached under an atmospheric pressure to form a leachate solution containing nickel, cobalt, and impurities;
(B) a first extraction step of separating the leachate solution into a first filtrate containing nickel and impurities and a first organic layer containing cobalt and impurities by adding a first solvent extractant to the leachate solution; and
(C-ii) a purification step of removing impurities including magnesium, manganese, zinc, copper, or mixtures thereof by adding a sulfuric acid solution to the first organic layer to produce a second filtrate, and adding sulfide to the second filtrate to precipitate and recover a cobalt precipitate.