| Autor: |
Luis, Jose, Gonzalez, Ignacio, Nava, Dora |
| Zdroj: |
ECS Transactions; April 2006, Vol. 2 Issue: 3 p143-153, 11p |
| Abstrakt: |
The anodic dissolution of a flotation zinc concentrate (63.4% sphalerite (ZnS), 20.1% pyrite (FeS2), 5% chalcopyrite (CuFeS2), 0.33% galena (PbS), 0.45% tetrahedryte (Cu12Sb4S13) and 0.4% arsenopyrite (FeAsS)) was studied in 1.7 M H2SO4. An electrochemical strategy (based on common electrochemical techniques) was proposed to find the potential range at which each mineral species can be oxidized. Anodic potential pulses were applied to carbon paste electrodes prepared with zinc concentrate (CPE-zinc concentrate). The resulting solutions were analysed by anodic stripping voltammetry (ASV). In addition, the surface of each modified CPE-zinc concentrate was characterized by cyclic voltammetry (CV). The sphalerite is oxidized in the range of 0 < E < 600 mV vs SSE with slow kinetic; similarly, galena dissolution took place in the same range. The dissolution of sphalerite is galvanically protected, while dissolution of chalcopyrite is favored. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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