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Leaching kinetics modelling of reductively roasted zinc calcine

ABSTRACT The kinetics of the acid leaching of reductively roasted zinc calcine was studied on sample particles with a fine-grained sediment structure. This structure has a porous surface during acid leaching, and the leaching behaviours of roasted zinc calcines are complicated. The leaching of iron is controlled by reactions at the solid–liquid interface with an active energy of 51.40 kJ mol−1, the kinetics model is described by The extraction of zinc could be expressed as with an active energy of 10.01 kJ mol−1 and this process is controlled by diffusion through the porous structure. Temperature is a key factor for the iron extraction, while acidity particle size may play an important role in the leaching of zinc. It is concluded that the selective leaching of zinc is favoured at a high acidity above 90 g L−1 and a low temperature.