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The bacterial oxidation of galena (PbS) has been studied, largely due to its relevance to the bioleaching of sphalerite (ZnS) and other sulphide minerals. Ferric sulphate oxidation experiments were first conducted as an analog to the indirect bio-oxidation mechanism, and the process was found to be diffusion-controlled due to the presence of a product layer. The bacterial oxidation of galena by a...
A study has been undertaken on the bacterial and ferric sulphate leaching of sphalerite, with the aim of observing the relative importance of both diffusion and reaction control, across a range of operating conditions. To facilitate this kinetic analysis a mixed-control rate equation was developed based upon the shrinking particle and shrinking core models, featuring both an intrinsic rate of zinc...
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