Abstract
Chalcopyrite leaching in acidic chloride solution without sulphates. The effect of dissolved oxygen and ferrous/ferric/cupric ions in solution on the leaching behavior of chalcopyrite and the phenomenology of the passivating layer formation on the chalcopyrite surface in an aqueous acidic chlorinated medium with dissolved oxygen and without sulphate are studied. The research was performed using pure chalcopyrite samples with particle sizes of +45 to -75 microns (-200+325 mesh). It was found that the formation of hydrogen sulfide (H2S) at room temperature and atmospheric pressure is a possible precursor of passivating species that prevent chalcopyrite dissolution.
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