Correlation Of The Oxide-Reduction Potential And Study Of The Bacterial Population During The Copper Sulfide Bioleaching
Journal Title: American journal of Engineering Research - Year 2018, Vol 7, Issue 6
Abstract
The interrelation of bacterial population variables and oxide-reduction potential in the bioleaching of sulphided minerals was studied by bacterial strain of AciditiobacilusFerrooxidans, isolated from acid mine effluent, seeking the copper solubilization and the release of gold present in a mineral with sulfides greater than 80%.The experimental variables were: Pulp density at 1, 2 and 6% (W / V), ferrous sulphate concentration as part of the 9k medium of 0, 3, 6, 9 and 15 gr / Lt.; keeping constant the temperature, agitation of the medium and pH.The tests were performed in three consecutive phases of 24 days, starting with inoculum containing 7.05x107Cell / ml and then the one obtained in each previous phase, observing the variation in the periods of adaptation and growth.In the first phase, the maximum bacterial density reached was 4.75x107Cell / ml with 6 g / l of ferrous sulphate. In the second phase a maximum density of 6.30x107Cell / ml was obtained without the addition of ferrous sulfate.In the third phase, the bacterial density reached was 4.51x107Cell / ml., With exponential growth beginnings at approximately 13, 8 and 3 days, respectively. The bacterial strains were successfully adapted in different media containing varying amounts of iron and sulfur minerals, giving better results in the absence of iron sulphate in the added substrate.
Authors and Affiliations
V. A. Arias Arce, D. F. Lovera Dávila, A. Flores Paucarima, T. L. Sánchez Rojas, W. Pardave
Keywords
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