Continuous microbial leaching of a pyritic concentrate by Leptospirillum-like bacteria |
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Authors: | Uta Helle Ulfert Onken |
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Institution: | (1) FB Chemietechnik, Lehrstuhl für Technische Chemie B, Universität Dortmund, Postfach 50 05 00, D-4600 Dortmund 50, Federal Republic of Germany |
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Abstract: | Summary Continuous leaching of a pyritic flotation concentrate by mixed cultures of acidophilic bacteria was studied in a laboratory scale airlift reactor. Enrichment cultures adapted to the flotation concentrate contained Thiobacillus ferrooxidans and Thiobacillus thiooxidans. During the late stationary growth phase of these thiobacilli growth of Leptospirillum-like bacteria was observed, too. In discontinuous cultivation no significant influence of Leptospirillum-like bacteria on leaching rates could be detected. During continuous leaching at pH 1.5 Leptospirillum-like bacteria displaced Thiobacillus ferrooxidans. The iron leaching rate achieved by Leptospirillum-rich cultures was found to be up to 3.9 times higher than that by Leptospirillum-free cultures. |
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