Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles

Ghorbani, Y., Petersen, J., Becker, M. , Mainza, A. N. and Franzidis, J. -P. (2013) Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles. Hydrometallurgy, 131 . pp. 8-23. ISSN 0304-386X

Full content URL: https://doi.org/10.1016/j.hydromet.2012.10.004

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Item Type:Article
Item Status:Live Archive

Abstract

X-ray Computed Tomography (CT) was used to follow the progression of Zn leaching in a number of individual sphalerite ore particles, which were subjected to a long-term simulated heap bioleaching environment. The ore was prepared by two different modes of comminution - HPGR at 90 bar and cone crusher - and individual particles were selected from three different size fractions. Investigation of the reacted fraction of Zn vs distance from the centre of each particle indicated that leaching from large particles leads to near complete conversion near the surface, but only partial conversion in the zones that are closer to the centre of particles. The cores of the cone-crushed particles show hardly any conversion at all, especially in the larger particle sizes. Mathematical analysis shows that leaching from the large particle does not follow the shrinking core model. It is shown that the progression can rather be described by a combined reaction-diffusion process progressing through the network of cracks and pores closer to the particle surface. Extent and depth of this network are a function of particle size and comminution method. A simplified rate model is proposed that describes the extent of leaching as a function of time in terms of a set of parameters that can all be related to just particle size and crushing mode. © 2012 Elsevier B.V. All rights reserved.

Keywords:Comminution, Computerized tomography, Particle size, Shrinkage, Zinc, Zinc sulfide, Heap leaching, Individual particles, Large particles, Larger particle sizes, Mathematical analysis, Reaction-diffusion process, Shrinking core model, X-ray computed tomography, Leaching
Subjects:F Physical Sciences > F140 Environmental Chemistry
F Physical Sciences > F100 Chemistry
Divisions:College of Science
College of Science > School of Chemistry
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ID Code:54551
Deposited On:30 Jun 2023 14:27

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