Copper removal from an industrial waste by bioleaching |
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Authors: | Thomas R. Clark Henry L. Ehrlich |
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Affiliation: | (1) Department of Biology, Rensselaer Polytechnic Institute, 12180-3590 Troy, NY, USA;(2) Present address: Coal Preparation Division, Pittsburgh Energy and Technology Center, U.S. Department of Energy, P.O. Box 10940, 15236 Pittsburgh, PA, USA |
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Abstract: | Summary Copper contained in a solid industrial waste produced in a silicone manufacturing process was leached with spent iron medium from aThiobacillus ferrooxidans culture. Most effective leaching was observed in a continuously fed, dual reactor system. Spent iron medium was generated by growingT. ferrooxidans in 0.9 K iron medium at pH 1.5 in the first reactor, and was transferred to a second reactor in which it leached the copper from the waste. Leaching was effective at a pulp density of the waste material as high as 20%. In experiments run at a pulp density of 2.5%, the spent iron medium was most efficient in leaching copper when it was first diluted 100-fold with a mineral salts solution at pH 1.5. Removal of the copper from the waste appeared to involve its displacement by acid, dissolved mineral salts, and ferric iron. Potentials for practical application of this process are discussed. |
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Keywords: | Industrial waste Copper removal Bioleaching Fe medium Thiobacillus ferrooxidans |
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