TY - JOUR
T1 - Inhibitory effect of iron-oxidizing bacteria on ferrous-promoted chalcopyrite leaching
AU - Hiroyoshi, Naoki
AU - Hirota, Masahiko
AU - Hirajima, Tsuyoshi
AU - Tsunekawa, Masami
PY - 1999/8/20
Y1 - 1999/8/20
N2 - It is generally accepted that iron-oxidizing bacteria, Thiobacillus ferrooxidans, enhance chalcopyrite leaching. However, this article details a case of the bacteria suppressing chalcopyrite leaching. Bacterial leaching experiments were performed with sulfuric acid solutions containing 0 or 0.04 mol/dm3 ferrous sulfate. Without ferrous sulfate, the bacteria enhance copper extraction and oxidation of ferrous ions released from chalcopyrite. However, the bacteria suppressed chalcopyrite leaching when ferrous sulfate was added. This is mainly due to the bacterial consumption of ferrous ions which act as a promoter for chalcopyrite oxidation with dissolved oxygen. Coprecipitation of copper ions with jarosite formed by the bacterial ferrous oxidation also causes the bacterial suppression of copper extraction.
AB - It is generally accepted that iron-oxidizing bacteria, Thiobacillus ferrooxidans, enhance chalcopyrite leaching. However, this article details a case of the bacteria suppressing chalcopyrite leaching. Bacterial leaching experiments were performed with sulfuric acid solutions containing 0 or 0.04 mol/dm3 ferrous sulfate. Without ferrous sulfate, the bacteria enhance copper extraction and oxidation of ferrous ions released from chalcopyrite. However, the bacteria suppressed chalcopyrite leaching when ferrous sulfate was added. This is mainly due to the bacterial consumption of ferrous ions which act as a promoter for chalcopyrite oxidation with dissolved oxygen. Coprecipitation of copper ions with jarosite formed by the bacterial ferrous oxidation also causes the bacterial suppression of copper extraction.
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U2 - 10.1002/(SICI)1097-0290(19990820)64:4<478::AID-BIT10>3.0.CO;2-0
DO - 10.1002/(SICI)1097-0290(19990820)64:4<478::AID-BIT10>3.0.CO;2-0
M3 - Article
AN - SCOPUS:0033588122
SN - 0006-3592
VL - 64
SP - 478
EP - 483
JO - Biotechnology and Bioengineering
JF - Biotechnology and Bioengineering
IS - 4
ER -