Eco-friendly oxidation leaching from chalcopyrite powder and kinetics assisted by sodium chloride in organic acid media

The realization of efficient leaching of metal elements in chalcopyrite is of great significance to global industrial development. In this work, an eco-friendly and efficient leaching process was investigated for the leaching of Cu and Fe from chalcopyrite powder. The results showed that the introduction of stirring energy has an adverse effect on the leaching process. 96.13% Cu and 84.35% Fe were leached under the optimal leaching conditions of 0 rpm stirring speed, the solid-liquid ratio of 10 g/L, 0.5 M HAc, 0.4 M NaCl, at 333.15 K for 10 h with timeic addition of H2O2 of 16 mL every 2 h. The kinetics data indicated that the leaching of Cu fitted best to the shrinking core model while the leaching of Fe corresponded to the Avrami equation. Furthermore, all the leaching processes mainly depended on the controlling of diffusion, and reaction order revealed that the volume of H2O2 had the greatest effect on the leaching rates. (C) 2022 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights reserved.