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Effect of mixed moderately thermophilic adaptation on leachability and mechanism of high arsenic gold concentrate in an airlift bioreactor

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Abstract

A refractory gold concentrate with 19% arsenic was treated by a mixed moderately thermophiles in an airlift bioreactor through an adaptation protocol. The moderately thermophiles could respond well to 20% (w/v) pulp density with less than 10% loss of productivity, and resist arsenic up to 15 g/L. There were a lot of jarosite, arsenolite and sulfur, but not scorodite and ferric arsenate in the bioleached residue. Jarosite passivation and lower sulfur-oxidizing activity of the cells due to the toxicity of the high concentrations of soluble arsenic and iron ions at low pH value should mainly response for the incomplete extraction at high pulp density. The initial bacterial community did not change in nature except for new found P aeruginosa ANSC, but sulfur-oxidizing microorganisms have been dominant microorganisms after a long time of adaptation. Pseudomonas aeruginosa originating from the gold concentrate should be closely relative to the metabolism of the organic matters contained in the refractory gold concentrate.

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Run-lan Yu  (余润兰), Fa-deng Wu  (吴发登), An Chen  (陈安), Li-juan Shi  (石丽娟), Wei-min Zeng  (曾伟民), Guo-hua Gu  (顾帼华), Wen-qing Qin  (覃文庆) & Guan-zhou Qiu  (邱冠周)

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  1. Run-lan Yu  (余润兰)
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  2. Fa-deng Wu  (吴发登)
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  3. An Chen  (陈安)
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  4. Li-juan Shi  (石丽娟)
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  5. Wei-min Zeng  (曾伟民)
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  6. Guo-hua Gu  (顾帼华)
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  7. Wen-qing Qin  (覃文庆)
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  8. Guan-zhou Qiu  (邱冠周)
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Correspondence to Run-lan Yu  (余润兰) or Wei-min Zeng  (曾伟民).

Additional information

Foundation item: Project(2010CB630903) supported by the National Basic Research Program of China; Project(31200382) supported by the Chinese Science Foundation for Distinguished Group, China

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Yu, Rl., Wu, Fd., Chen, A. et al. Effect of mixed moderately thermophilic adaptation on leachability and mechanism of high arsenic gold concentrate in an airlift bioreactor. J. Cent. South Univ. 22, 66–73 (2015). https://doi.org/10.1007/s11771-015-2495-9

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  • DOI: https://doi.org/10.1007/s11771-015-2495-9

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