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Chalcopyrite to copper

In the presence of Cu(I), chalocopyrite is reduced to Cu2S and Cu5FeS4. Electrochemical studies on polished chalcopyrite crystals establish that this reaction is electrochemical in nature and dependent on the redox potential of the copper(II)/copper(I) couple. A sharp decrease in the initial rate of reduction is observed which is attributed to the rapid formation of bornite and diffusion of Cu

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