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Dynamic redox potential measurement for determining the ferric leach kinetics of pyrite
Journal article   Peer reviewed

Dynamic redox potential measurement for determining the ferric leach kinetics of pyrite

N. May, D.E. Ralph and G.S. Hansford
Minerals Engineering, Vol.10(11), pp.1279-1290
1997
DOI: https://doi.org/10.1016/S0892-6875(97)00114-3
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Abstract

The bioleaching of pyrite has been found to occur via an indirect mechansim. Ferric iron leaches the pyrite, and is reduced to ferrous iron. Bacteria such as Thiobacillus ferrooxidans oxidise the ferrous iron to ferric iron, thus maintaining a high redox potential. The effect of the redox potential on the ferric leach rate was investigated by developing an experimental technique where dynamic redox potential measurements were used to study the kinetics of the sub process. The ferric leach rate of pyrite was found to be of the order of 3 × 10−7 moles pyrite per mole pyrite per second, which is of the same order of magnitude as rates reported for the bioleaching of pyrite over similar ranges of redox potential. The rate decreased as the redox potential decreased, in what appeared to be a Butler-Volmer-like manner. This, along with the observation that there was no significant effect of the total iron concentration, suggested the likelihood of an electrochemical mechanism being operative, with charge transfer at the pyrite surface being rate limiting.

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Collaboration types
Domestic collaboration
International collaboration
Citation topics
7 Engineering & Materials Science
7.229 Mineral & Metal Processing
7.229.774 Bioleaching
Web Of Science research areas
Engineering, Chemical
Mineralogy
Mining & Mineral Processing
ESI research areas
Geosciences
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