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Chemical Reactions in the Roasting of Copper Sulfides
The Bureau of Mines investigated the sequence of principal chemical reactions taking place during the roasting of covellite (CuS). Practically all covellite is converted to digenite (Cu1·S) before oxidation to Cu2 begins. Part of the Cu2O is then converted to CuO, which in turn forms CuSO4 through CuO·CuSO4 as an intermediary. CuSO4 and CuO·CuSO4 decompose at 600° to 700° C to yield CuO and SO3 (g) as final products. An overall mechanism is proposed for chemical reactions occurring at different interfaces of partially oxidized CuS pellets.
