Kinetics and mechanisms of the leaching of low Fe sphalerite |
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| Authors: | CG Weisener AR Gerson |
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| Institution: | 1 Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia |
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| Abstract: | The surface speciation and leaching kinetics of 38- to 75-μm sphalerite (0.45 wt.% Fe) particles reacted in O2 purged perchloric acid (at pH 1.0) at 25, 40, 60, and 85 °C over a leach period of 144 h were investigated. In all cases, an initial rapid leach rate is observed followed by a slower leach rate. These two leach regimes can each be adequately modeled using straight-line interpolation, and thus two activation energies (Ea) have been derived. Ea for the fast and slow Zn dissolution rates were 33 ± 4 kJ mol−1 and 34 ± 4 kJ mol−1 respectively, suggesting the same rate-determining step. |
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