Abstract
Phospholipids such as phosphatidylethanolamine and phosphatidylglycerol are detected as extracellular substances in cultures of Thiobacillus ferrooxidans and Thiobacillus thiooxidans, but their effect on bacterial leaching is not well understood. In this paper, basic experiments on bacterial leaching of chalcopyrite by Thiobacillus ferrooxidans were carried out in the presence of phosphatidylethanolamine.The copper extraction in chemical leaching of chalcopyrite with ferric sulfate increased slightly by the addition of phosphatidylethanolamine. In the medium containing ferrous sulfate as substrate, the ferrous oxidation by Thiobacillus ferrooxidans and its growth were not affected by the addition of phosphatidylethanolamine. In bacterial leaching, the addition of phosphatidylethanolamine had no effect on the copper extraction and bacteria adsorption on the mineral surfaces. These results were different from the results with phosphatidylglycerol.
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