鉱物処理

[2P0121-29-01] Effects of solution composition on anodic polarization curves of CuFeS₂ in acidic chloride solutions

○Nguyen Thi Phuong Thao¹, Sanghee Jeon¹, Ilhwan Park¹, Carlito Baltazar Tabelin², Mayumi Ito¹, Naoki Hiroyoshi¹ (1. Hokkaido University, 2. University of New South Wales, Australia)

Keywords:chalcopyrite, ferrous, cupric, chloride, proton

Effects of solution composition (Fe²⁺, Cu²⁺, Cl^-, and H⁺ concentrations) on the anodic polarization curves of chalcopyrite in acidic chloride solutions were studied using the conventional three-electrode system at 25 ^oC under N₂ atmosphere. An active-passive behavior was obtained in all examined conditions, i.e., the current increased with increasing redox potentials to reach a peak at a certain redox potential, then it decreased at higher redox potentials. At all applied redox potentials, the current increased with increasing Fe²⁺, Cu²⁺, and Cl^- concentrations and decreased with increasing H⁺ concentrations. Based on the results, the mechanism of chalcopyrite dissolution was discussed.