Abstract
This paper briefly describes the studies carried out on oxidative ammonia leaching of Cu-Zn-Pb multimetal sulphides. Kinetics of zinc and copper dissolution were studied with − 200 + 300 mesh BSS fraction and 1% solids in the slurry. It is observed that the dissolution of sphalerite proceeds by a phase boundary reaction model and that of copper via diffusion through product layer in the temperature range of 70-100°C. The rate equations for zinc and copper dissolution are given by: 1 − (1 − α)1/3 = k Zn[NH3][pO2]1/2 1 − 2/3α − (1 2/3α )2/3 = kCu[NH3]2[pO2]1/2 where the symbols have the usual meanings. Activation energies for zinc and copper dissolution reactions are estimated to be 66.5 and 55.4 kJ/mole, respectively. Activation energy values thus obtained are also comparable to those obtained using a differential approach. The leaching results obtained with 10% solids using a wide range of particle size (− 140 + 500 mesh) indicate that copper dissolution is chemically controlled in ammonia as well as ammo...
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