Abstract
Sulphide minerals are semiconductors, and galvanic couples form once the minerals come in contact in aqueous medium. These galvanic effects play an important role during wet grinding, flotation and leaching. In this paper, the literature on this field has been reviewed. Such interactions have been examined in the present study of ammonia leaching of Cu, Pb. Zn sulphide minerals through dual cell measurements. Detailed measurements on three such galvanic couples, viz.. chalcopyrite-galena, chal-copyrite-sphalerite, and sphalerite-galena are reported. Individual half cell potentials, galvanic currents, and mixed potentials have been measured. Tafel plots for the chalcopyrite-galena couple have also been determined. Studies have been made to obtain a qualitative as well as a quantitative estimation of possible galvanic interactions. The estimations are compared to some of the actual leaching results.
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