Life in heaps: a review of microbial responses to variable acidity in sulfide mineral bioleaching heaps for metal extraction.
Industrial heap leaching of low grade mineral sulfide ores is catalysed by the use of acidophilic microorganisms. These microorganisms obtain energy for growth from the oxidation of reduced inorganic or organic compounds, including soluble ferrous ion, reduced inorganic sulfur compounds (RISC) and acid-stable organic compounds. By-products of these oxidative processes, such as soluble ferric ion and sulfuric acid create favourable chemical conditions for leaching. This review is focused on the behaviour of common bioleaching microorganisms, their responses to changing pH in an industrial setting, and how both changes and microbial responses can impact the micro and macro environment.
CSIRO Mineral Resources, Australian Minerals Research Centre, PO Box 7229, Karawara, WA 6152, Australia. Electronic address: Denis.Shiers@csiro.au.
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Shiers
CSIRO Mineral Resources, Australian Minerals Research Centre, PO Box 7229, Karawara, WA 6152, Australia. Electronic address: David.Collinson@csiro.au.
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Collinson
CSIRO Mineral Resources, Australian Minerals Research Centre, PO Box 7229, Karawara, WA 6152, Australia. Electronic address: Helen.Watling@csiro.au.
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Watling
D058448:Biota / Q000187:drug effects*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000302:isolation & purification* / Q000378:metabolism*; D008903:Minerals / Q000378:metabolism*; D008906:Mining / Q000379:methods; D013440:Sulfides / Q000378:metabolism*; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology*
D008670:Metals; D008903:Minerals; D013440:Sulfides; D062065:Wastewater
Acid stress; Acidophiles; Chemolithotrophs