cobalt processing | Uses, Supply, amp; Facts | Britannica
From copper and nickel processing. Cobalt contained in and smelted with copper concentrate is oxidized along with iron during the final conversion to blister copper. It then enters the slag layer, which can be treated separately, usually in an electric furnace, and the cobalt recovered by reduction with carbon to a copperironcobalt alloy. In nickel smelting, most of the cobalt is recovered during electrolytic refining