Microbiological leaching of a chalcopyrite concentrate by Thiobacillus ferrooxidans

Biotechnology and Bioengineering
H Sakaguchi, M Silver

Abstract

The microbiological leaching of a chalcopyrite concentrate has been investigated using a pure strain of Thiobacillus ferrooxidans. The optimum leaching conditions regarding pH, temperature, and pulp density were found to be 2.3, 35 degrees C, and 22% respectively. The energy of activation was calculated to be 16.7 kcal/mol. During these experiments the maximum rate of copper dissolution was about 215 mg/liters/hr and the final copper concentration was as high as 55 g/liter. This latter value is in the range of copper concentrations which may be used for direct electrorecovery of copper. Jarosite formation was observed during the leaching of the chalcopyrite concentrate. When the leach residue was reground to expose new substrate surface, subsequent leaching resulted in copper extractions up to about 80%. On the basis of this experimental work, a flow sheet has been proposed for commercial scale biohydrometallurgical treatment of high-grade chalcopyrite materials.

References

Nov 20, 1993·Biotechnology and Bioengineering·A D Bailey, G S Hansford
Apr 1, 1986·Biotechnology and Bioengineering·R M Bagdigian, A S Myerson
Jan 1, 1978·CRC Critical Reviews in Microbiology·C L Brierley
Apr 1, 1982·Biotechnology and Bioengineering·Y C Chang, A S Myerson
Jun 1, 1984·Biotechnology and Bioengineering·F Kargi, J G Weissman
Jun 1, 1983·Biotechnology and Bioengineering·A S Myerson, P C Kline
Jan 1, 1984·Biotechnology and Bioengineering·A S Myerson, P C Kline

Citations

Jan 1, 1972·Zeitschrift für allgemeine Mikrobiologie·O H Tuovinen, D P Kelly
Feb 1, 1974·Canadian Journal of Microbiology·M Silver, A E Torma
Jul 1, 1970·Biotechnology and Bioengineering·A E TormaR M Branion
Jun 7, 1958·Nature·K BURTON
Apr 1, 1959·The Journal of Pathology and Bacteriology·C A ROSS
Mar 1, 1963·Journal of Bacteriology·W E RAZZELL, P C TRUSELL

Related Concepts

Dental Pulp
Copper
Thioethers
Bioremediation
Acidithiobacillus ferrooxidans
Thiobacillus thioparus
Iron

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