Abstract
The surface speciation and leaching kinetics of 38- to 75-μm sphalerite (0.45 wt.% Fe) particles reacted in O 2 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 (E a) have been derived. E a 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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