Abstract:The electrochemical reaction behaviors on chalcopyrite were investigated using cycle voltammetry and potentiostatic I—t curve at 20 ℃ and pH=2. The voltammograms show that the oxidization of chalcopyrite occurs at slow rate in potential range from 400 to 800 mV(vs SHE). The reason is that the intermediate products are very difficult to be further dissolved unceasingly if Fe3+ ion in lattice has not been dissolved. Fe3+ ion in lattice can be dissolved effectively for the strong deoxidization when the negative potential is lower than −400 mV(vs SHE). Meanwhile, the products can be oxidized easily under higher positive potential, but this reactions are also passivated later. The cathodic reduction is stronger and plays an important role for the dissolution of chalcopyrite. The potentialstatic I—t curve also identify the above conclusion.

Key words: chalcopyrite; decomposition; anodic oxidization; cathodic reduction