A study on the toxic effects of chloride on the biooxidation efficiency of pyrite

Gahan, Chandra Sekhar; Sundkvist, Jan-Eric; Sandström, Åke

doi:10.1016/j.jhazmat.2009.07.133

Cited by 42 publications

(17 citation statements)

References 23 publications

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“…caldus grown on a pyrite concentrate could adapt to sudden exposure to 3-5 g L −1 NaCl with only a small reduction in planktonic cell numbers. However, it ceased oxygen uptake immediately when exposed to 6.6 g L −1 NaCl and failed to recover in a seven day period (Gahan et al, 2009). In another study, At.…”

Section: Effects Of Anions On Tetrathionate Oxidationmentioning

confidence: 94%

Microbial behaviour under conditions relevant to heap leaching: Studies using the sulfur-oxidising, moderate thermophile Acidithiobacillus caldus

2012

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Section: Effects Of Anions On Tetrathionate Oxidationmentioning

confidence: 94%

Microbial behaviour under conditions relevant to heap leaching: Studies using the sulfur-oxidising, moderate thermophile Acidithiobacillus caldus

2012

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“…The polysulphide pathway is applicable to the oxidation of acid-soluble sulphides like galena (PbS), sphalerite (ZnS), arsenopyrite (FeAsS) and chalcopyrite (CuFeS 2 ). The polysulphide pathway followed during zinc sulphide bioleaching is represented by Equations (10) and (11).…”

Section: Biohydrometallurgical Processesmentioning

confidence: 99%

“…However, it should be noted that the maintenance of efficient bioleaching of sulphide minerals requires elevated or high rate ferrous oxidation. 40,11,41 Investigations by Torma 42,43 have shown that the following non-iron metal sulfides can be oxidized by microorganisms in the absence of soluble iron, albeit at a remarkably slow rate: covellite (CuS), chalcocite (Cu 2 S), sphalerite (ZnS), galena (PbS), molybdenite (MoS 2 ), stibnite (Sb 2 S 3 ), cobaltite (CoS), millerite (NiS). These microbial oxidations are easily demonstrated, but the microbial metabolism and growth can be negatively affected by dissolved metal ions which then limit the bioleaching process efficiency.…”

Section: Biohydrometallurgical Processesmentioning

confidence: 99%

Biohydrometallurgy of secondary metal resources: a potential alternative approach for metal recovery

Erüst

Akçıl

Gahan

et al. 2013

J of Chemical Tech & Biotech

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128

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Research on biohydrometallurgy of secondary metal resources is primarily focused on the leaching of valuable metals. For secondary metal resources biological processing can be an economically more effective and environmentally friendlier alternative to traditional hydrometallurgical and pyrometallurgical processes. Therefore, biohydrometallurgy is a rapidly evolving biotechnology that has already provided revolutionary solutions to old problems associated with recovery of metals by conventional pyrometallurgy and chemical metallurgy. This review evaluates various processes of recovery of metals from waste materials and commercial applications are discussed. Case studies and future technology directions are reviewed. © 2013 Society of Chemical Industry

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“…Bioleaching operations in regions with limited chloride free water have motivated the study of the effect of chloride ions on biomining efficiency (Deveci et al, 2008;Gahan et al, 2009;Lawson et al, 1995;Shiers et al, 2005;Weston et al, 1994). High concentrations of chloride may influence the biooxidation efficiency both by jarosite precipitation with its counter-ions (e.g., sodium or potassium), that removes Fe 3þ from solution, as well as imposing toxic effects on the microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Effect of chloride on ferrous iron oxidation by a Leptospirillum ferriphilum‐dominated chemostat culture

Gahan

Sundkvist

Dopson

et al. 2010

Biotech & Bioengineering

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Biomining is the use of microorganisms to catalyze metal extraction from sulfide ores. However, the available water in some biomining environments has high chloride concentrations and therefore, chloride toxicity to ferrous oxidizing microorganisms has been investigated. Batch biooxidation of Fe(2+) by a Leptospirillum ferriphilum-dominated culture was completely inhibited by 12 g L(-1) chloride. In addition, the effects of chloride on oxidation kinetics in a Fe(2+) limited chemostat were studied. Results from the chemostat modeling suggest that the chloride toxicity was attributed to affects on the Fe(2+) oxidation system, pH homeostasis, and lowering of the proton motive force. Modeling showed a decrease in the maximum specific growth rate (micro(max)) and an increase in the substrate constant (K(s)) with increasing chloride concentrations, indicating an effect on the Fe(2+) oxidation system. The model proposes a lowered maintenance activity when the media was fed with 2-3 g L(-1) chloride with a concomitant drastic decrease in the true yield (Y(true)). This model helps to understand the influence of chloride on Fe(2+) biooxidation kinetics.

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A study on the toxic effects of chloride on the biooxidation efficiency of pyrite

Cited by 42 publications

References 23 publications

Microbial behaviour under conditions relevant to heap leaching: Studies using the sulfur-oxidising, moderate thermophile Acidithiobacillus caldus

Microbial behaviour under conditions relevant to heap leaching: Studies using the sulfur-oxidising, moderate thermophile Acidithiobacillus caldus

Biohydrometallurgy of secondary metal resources: a potential alternative approach for metal recovery

Effect of chloride on ferrous iron oxidation by a Leptospirillum ferriphilum‐dominated chemostat culture

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