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- W2593937812 abstract "Ammoniacal solutions are an effective lixiviant for the oxidative dissolution of some mineral sulphides. A study of the anodic dissolution of chalcopyrite in ammonium sulphate-ammonium hydroxide solutions has been carried out using cyclic voltammetry, chrono-amperometry and rest-potential measurements. The role of the copper(II)/copper(I) redox couple in the oxidation process has been evaluated. Rest potentials have been found not to be affected by oxygen but to increase with an increase in initial copper(II) concentration. This trend remains more or less unchanged with increasing total ammonia (NH3+NH4+) concentration. Cyclic voltammetry analysis shows an oxidation peak/shoulder when anodically polarising the chalcopyrite after attaining rest potential in the presence of copper(II) ions. All reverse sweep curves are more or less identical, but the Tafel slope decreases from around 150 mV/decade at 1M total ammonia concentration to around 120 mV/decade at higher ammonia concentrations. Pseudo-steady-state..." @default.
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- W2593937812 date "2014-01-01" @default.
- W2593937812 modified "2023-09-23" @default.
- W2593937812 title "An electrochemical study of the dissolution of chalcopyrite in ammonia-ammonium sulphate solutions" @default.
- W2593937812 hasPublicationYear "2014" @default.
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