Microbiological Controls on Geochemical Kinetics 2: Case Study on Microbial Oxidation of Metal Sulfide Minerals and Future Prospects

Roden, Eric E.

doi:10.1007/978-0-387-73563-4_9

Cited by 4 publications

(4 citation statements)

References 175 publications

(186 reference statements)

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“…The possibility that multiple mechanisms of interaction occur throughout different stages of mineral oxidation seems possible [374]. Initially, cells localize to non-random sites on the mineral sulfide surface, through an unknown mechanism, and attachment proceeds by CPS, pili, flagella, S-layer, mineral receptors (e.g., aporusticyanin), or a combination.…”

Section: Attachment Of Extreme Thermoacidophiles To Surfacesmentioning

confidence: 99%

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

et al. 2015

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Extreme thermoacidophiles (Topt > 65 °C, pHopt < 3.5) inhabit unique environments fraught with challenges, including extremely high temperatures, low pH, as well as high levels of soluble metal species. In fact, certain members of this group thrive by metabolizing heavy metals, creating a dynamic equilibrium between biooxidation to meet bioenergetic needs and mechanisms for tolerating and resisting the toxic effects of solubilized metals. Extremely thermoacidophilic archaea dominate bioleaching operations at elevated temperatures and have been considered for processing certain mineral types (e.g., chalcopyrite), some of which are recalcitrant to their mesophilic counterparts. A key issue to consider, in addition to temperature and pH, is the extent to which solid phase heavy metals are solubilized and the concomitant impact of these mobilized metals on the microorganism's growth physiology. Here, extreme thermoacidophiles are examined from the perspectives of biodiversity, heavy metal biooxidation, metal resistance mechanisms, microbe-solid interactions, and application of these archaea in biomining operations.

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Section: Attachment Of Extreme Thermoacidophiles To Surfacesmentioning

confidence: 99%

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

et al. 2015

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“…The definitive absence of any traces of ferric iron from the studies mentioned above cannot be absolutely assured. This would then imply an indirect ferric iron-mediated reaction mechanism, similar to that described for aerobic pyrite oxidation [3,26]. Still, the coupling of an abiotic iron-mediated electron shuttling to microbial ferrous iron oxidation and nitrate reduction is a significant observation.…”

Section: Mechanisms Of Anaerobic Pyrite Oxidationmentioning

confidence: 95%

“…Its valence bands are entirely derived from its metal orbitals, rendering the crystal inert against proton/acid-promoted dissolution and therefore also against direct microbial dissolution [3]. Nevertheless, pyrite can be rapidly oxidized by ferric iron under acidic conditions [5].…”

Section: Pyrite In the Global Sulfur Cyclementioning

confidence: 99%

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Rates and potential mechanism of anaerobic nitrate-dependent microbial pyrite oxidation

Bosch

2012

Biochemical Society Transactions

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Pyrite (FeS2) is a major iron- and sulfur-containing mineral phase in the environment. Oxidation of pyrite by aerobic micro-organisms has been well investigated. However, the reactivity of pyrite under anoxic conditions is still an open question. In the present paper, we summarize field and laboratory data on this chemolithotrophic respiration process with nitrate as terminal electron acceptor. Geochemical and stable isotope field data indicate that this process is occurring. Laboratory studies are more ambiguous, but recent positive results provide evidence that anaerobic microbial pyrite oxidation can, in fact, occur with nitrate as electron acceptor.

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Biomining: Metal Recovery from Ores with Microorganisms

Schippers

Hedrich

Vasters

et al. 2013

Advances in Biochemical Engineering/Biotechnology

157

120

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Biomining is an increasingly applied biotechnological procedure for processing of ores in the mining industry (biohydrometallurgy). Nowadays the production of copper from low-grade ores is the most important industrial application and a significant part of world copper production already originates from heap or dump/stockpile bioleaching. Conceptual differences exist between the industrial processes of bioleaching and biooxidation. Bioleaching is a conversion of an insoluble valuable metal into a soluble form by means of microorganisms. In biooxidation, on the other hand, gold is predominantly unlocked from refractory ores in large-scale stirred-tank biooxidation arrangements for further processing steps. In addition to copper and gold production, biomining is also used to produce cobalt, nickel, zinc, and uranium. Up to now, biomining has merely been used as a procedure in the processing of sulfide ores and uranium ore, but laboratory and pilot procedures already exist for the processing of silicate and oxide ores (e.g., laterites), for leaching of processing residues or mine waste dumps (mine tailings), as well as for the extraction of metals from industrial residues and waste (recycling). This chapter estimates the world production of copper, gold, and other metals by means of biomining and chemical leaching (bio-/hydrometallurgy) compared with metal production by pyrometallurgical procedures, and describes new developments in biomining. In addition, an overview is given about metal sulfide oxidizing microorganisms, fundamentals of biomining including bioleaching mechanisms and interface processes, as well as anaerobic bioleaching and bioleaching with heterotrophic microorganisms.

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Microbiological Controls on Geochemical Kinetics 2: Case Study on Microbial Oxidation of Metal Sulfide Minerals and Future Prospects

Cited by 4 publications

References 175 publications

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

Rates and potential mechanism of anaerobic nitrate-dependent microbial pyrite oxidation

Biomining: Metal Recovery from Ores with Microorganisms

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