Laboratory Extraction of Copper from Chalcocite by Roasting, Reduction, and Smelting.
SME J 1971 Sep; 250(3):243-247
A process for winning copper from pelletized chalcocite concentrate without matte smelting and converting is under development at the Twin Cities Metallurgy Research Center of the Bureau of Mines. The new procedure includes a two-stage fluid-bed treatment in which the pelletized concentrate with 33 percent cu and 7 percent s is first desulfurized to about 0.5 percent s in an oxidizing atmosphere, and then metallized by reduction with hydrogen. The reduced product is melted with flux to separate metallic copper from the gangue. The metal must be refined to remove residual sulfur and iron. The pelletizing of the fine concentrate into mini-pellets prior to fluid- bed treatment is an important feature of the process, because it permits shorter reaction time, decreases, dusting, and facilitates subsequent processing.
SME J., V. 250, No. 3, September 1971, PP. 243-247