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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Springer Netherlands

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DOI

10.1006/jctb.1997.1746

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1573-0972

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Are bioleaching rates determined by the available

Authors: Pedro Valencia Fernando Acevedo
Publish Date: 2008/10/07
Volume: 25, Issue: 1, Pages: 101-106
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Abstract

It is well known that pulp density and particle size determine the available surface area concentration and have an influence in the overall rate of bioleaching of minerals As metal solubilization takes place through the surface area of the particles it can be expected that different combinations of pulp densities and particle sizes giving the same surface area concentration would determine the same leaching rate The objective of this work was to test this hypothesis on the effect of surface area concentration pulp density and particle size of the biooxidation of a pyritic gold concentrate by the thermophilic Archaeon Sulfolobus metallicus in shake flasks The gold concentrate was used at 25 5 10 and 15 w/v pulp density and at four size fractions 150–106 106–75 75–38 and –38 μm Temperature was 68°C and the initial pH was 20 Results showed that the volumetric productivities of iron and sulfate depend not only on the surface area concentration but also on pulp density and particle size considered separately These two variables not only determine surface area but also exert additional effects on the process so the hypothesis was not confirmed Maximum attained iron productivity was 1042 g/l day with the 75–38 μm fraction at 5 pulp density Maximum sulfate productivity was 4279 g/l day with the 75–38 μm fraction at 10 pulp density

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