Leaching of pyrites of various reactivities by Thiobacillus ferrooxidans
Article Abstract:
The oxidation of mineral pyrites and pyritic materials of various chemical reactivities by Thiobacillus ferrooxidans was studied. At 04% pulp density, T. ferrooxidans oxidized the pyritic materials at varying rates, indicating the differences of chemical reactivities of the pyrites. Increasing the pulp density to 2.0% resulted in no pyrite oxidation in the mostchemcally reactive pyrite, while bioleaching was delayed in pyrites derived from coal sources. However, no inhibition of pyrite oxidation was observed for mineral pyrites. The results suggest that evaluation of bioleachers should takeinto consideration the differences in pyrite reactivities during initial studies.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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Mechanism of pyrite dissolution in the presence of Thiobacillus ferrooxidans
Article Abstract:
A study has been conducted to determine if Thiobacillus ferrooxidans can enhance the rate of bacterial leaching above that which is achieved by ferric sulfate solutions under the same conditions. To provide a viable solution, an experiment was conducted involving similar levels of ferrous and ferric ion concentrations in separate solutions, one with bacteria while the other was without. Findings indicate that a higher rate of leaching was achieved due to the higher pH level caused by the bacteria on the surface of the pyrite.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1999
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