| Abstrakt: |
A comparative study has been performed of the anodic dissolution reactivity of a high purity chalcopyrite (99.46%) and chalcopyrite concentrate (71.7% Chalcopyrite (CuFeS2), 16.6% Galena (PbS), 0.8% Arsenopyrite (AsS), 5.0% Sphalerite (ZnS), 3.1% Pyrite (FeS2), and 0.4% Tetrahedrite (Cu3(Sb,As) S3). A sequence of anodic potential pulses was applied to the carbon paste-chalcopyrite (CPE-CP) and concentrate chalcopyrite (CPE-CC) electrodes to characterize their electrochemical behavior in 1.7 M H2SO4. Copper and lead ions, dissolved by the potential pulses, were determined using anodic stripping voltammetry (ASV) with mercury film electrode (MFE) on a vitreous carbon disk. In addition, the modified surface of CPE- CP and CPE-CC were characterized, before and after the potential pulses, by cyclic voltammetry (CV). The characterization of the final surface state of each electrochemically modified electrode and the solution composition showed that the dissolution of chalcopyrite in a concentrate is favored by the presence of galena. |
