Авторы: WEISENER C., SMART R., GERSON A.

2003 г.

Geochim.Cosmochim.Acta

    The surface speciation and leaching kinetics of 38- to 75-
m 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 mol1 and 34
4 kJ mol1 respectively, suggesting the same rate-determining step.

Файл: 546.pdf