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Inhibitory effect of iron-oxidizing bacteria on ferrous-promoted chalcopyrite leaching

✍ Scribed by Naoki Hiroyoshi; Masahiko Hirota; Tsuyoshi Hirajima; Masami Tsunekawa

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 207 KB
Volume: 64
Category: Article
ISSN: 0006-3592
DOI: 10.1002/(sici)1097-0290(19990820)64:4<478::aid-bit10>3.0.co;2-0

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✦ Synopsis

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/dm 3 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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