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

Abstract

A substantial amount of copper is obtained by dump leaching of low-grade ore that would otherwise become waste. 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{sup 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.

Authors:
; ; ;
Publication Date:
Research Org.:
Hokkaido Univ., Sapporo (JP)
OSTI Identifier:
20000546
Resource Type:
Journal Article
Journal Name:
Biotechnology and Bioengineering
Additional Journal Information:
Journal Volume: 64; Journal Issue: 4; Other Information: PBD: 20 Aug 1999; Journal ID: ISSN 0006-3592
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; CHALCOPYRITE; MATERIALS RECOVERY; COPPER; ORE PROCESSING; MICROBIAL LEACHING; THIOBACILLUS FERROXIDANS; INHIBITION

Citation Formats

Hiroyoshi, Naoki, Hirota, Masahiko, Hirajima, Tsuyoshi, and Tsunekawa, Masami. Inhibitory effect of iron-oxidizing bacteria on ferrous-promoted chalcopyrite leaching. United States: N. p., 1999. Web. doi:10.1002/(SICI)1097-0290(19990820)64:4<478::AID-BIT10>3.0.CO;2-0.
Hiroyoshi, Naoki, Hirota, Masahiko, Hirajima, Tsuyoshi, & Tsunekawa, Masami. Inhibitory effect of iron-oxidizing bacteria on ferrous-promoted chalcopyrite leaching. United States. doi:10.1002/(SICI)1097-0290(19990820)64:4<478::AID-BIT10>3.0.CO;2-0.
Hiroyoshi, Naoki, Hirota, Masahiko, Hirajima, Tsuyoshi, and Tsunekawa, Masami. Fri . "Inhibitory effect of iron-oxidizing bacteria on ferrous-promoted chalcopyrite leaching". United States. doi:10.1002/(SICI)1097-0290(19990820)64:4<478::AID-BIT10>3.0.CO;2-0.
@article{osti_20000546,
title = {Inhibitory effect of iron-oxidizing bacteria on ferrous-promoted chalcopyrite leaching},
author = {Hiroyoshi, Naoki and Hirota, Masahiko and Hirajima, Tsuyoshi and Tsunekawa, Masami},
abstractNote = {A substantial amount of copper is obtained by dump leaching of low-grade ore that would otherwise become waste. 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{sup 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.},
doi = {10.1002/(SICI)1097-0290(19990820)64:4<478::AID-BIT10>3.0.CO;2-0},
journal = {Biotechnology and Bioengineering},
issn = {0006-3592},
number = 4,
volume = 64,
place = {United States},
year = {1999},
month = {8}
}