![]() ![]() Iron and lighter impurities float to the surface as solid dross or are expelled from the melt as gas. The cobalt-bearing concentrate is then mixed with lime and coal, and then melted in a reducing atmosphere. The ore is comminuted and the cobalt rich oxides are separated by froth flotation. Recovery from copper-cobalt oxide concentrates Addition of hydrogen gas to saturation precipitates cobalt powder with a purity of approximately 99.6%. The solution is then further reduced with more sulfuric acid and cobalt metal powder is added to aid in the nucleation of precipitants ( seeding).
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