Abstract
The surface oxidation of platinum and chalcopyrite in borate solutions of pH 9.2 has been studied by small amplitude cyclic voltammetry. Triangular voltage sweeps of small amplitude and relatively high potential sweep rates were used at different off-set potentials. The apparent polarization resistance, diagonal resistance and Delta I values were calculated from the current-potential hysteresis loop responses. It was found that the formation of dixanthogen which is not revealed by classical high amplitude cyclic voltammetry, was observed by the present technique. The presence of CuEtX resulting from a direct reaction between chalcopyrite and xanthate was substantiated. The present research supports thus the importance of CuEtX on the onset of chalcopyrite flotation.
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