The rate of dissolution of a chalcopyrite concentrate was measured in ammoniacal solutions under oxygen pressure for conditions when chemical reaction rate controlled. Temperatures from 50°‐95°C, oxygen pressures to 689 kPa and ammonia concentrations from 2.5 to 7.0 mol/l were investigated. An electrochemical surface reaction model in which the cathodic reduction of oxygen on the solid surface is rate determining satisfactorily predicts experimental behaviour in the range of experimental data. The activation energy for the reaction was found to be 74.1 kJ/mol.
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Reilly et al. (1977) studied this question.
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