Copper hydrometallurgy research of the federal Bureau of Mines is reviewed over the past 20 years. Several methods have been investigated for the treatment of ore, mine waste, and flotation concentrates with the research emphasis placed in those areas in which needs are greatest to improve the recovery of copper, to produce higher purity copper, and to reduce environmental degradation. Examples of the research described are: the role of bacteria during leaching of copper sulfide minerals in ore mining wastes, fines flotation-coarse fraction leaching of sized copper- bearing mine waste to improve copper recovery and to recover valuable byproduct metal, development of a mathematical model to predict the rate of dissolution of copper sulfides from coarse rock, in situ leaching of low-grade oxide, sulfide flotation concentrates by pressure leaching, ferric chloride leaching, double roast- leaching and matte smelt-leaching techniques, recovery of copper from leach liquors by cementation and solvent extraction- electrowinning, and high-current-density electrorefining of copper.
Copper, V. II--oxidized, 11th Internat. Miner. Proc. Cong., Sao Paulo, Brazil, PP. 45-72