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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (4): 106-112.doi: 10.11872/j.issn.1005-2518.2017.04.106

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Variation of Arsenic Valence and Its Effect on Bacteria During Biooxidation of Refractory Gold Concentrate Containing Arsenic

ZHANG Yuxiu 1，GUO Degeng 1，LI Yuanyuan 2，ZHANG Guangji 2，3   

  1. 1.China University of Mining and Technology ( Beijing)，Beijing    100083，China；
    2.Key Laboratory of Green Process and Engineering，Institute of Process Engineering，Chinese Academy of Sciences， Beijing    100190，China；
    3.School of Chemistry and Chemical Engineering，University of Chinese Academy of Sciences，Beijing    100149，China
  • Received:2017-05-08 Revised:2017-07-11 Online:2017-08-30 Published:2017-10-30

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Abstract:

As an environmentally friendly technology，the biooxidation pretreatment of refractory gold ore has been applied widely all around the world.However，in the process of preliminary biooxidation，the growth of the bacteria can be inhibited by the  toxicity of the released As（III）.In this study，biooxidation experiment of arsenic containing gold concentrate was carried out with Acidi-thiobacillus ferrooxidans under different conditions.The variation of arsenic valence in the solution was monitored and its effect on bacterial growth was investigated.The experimental results showed that the released trivalent arsenic As（III） could be quickly oxidized to pentavalent arsenic As（V） at higher redox potential（Eh > 480 mV），which was less toxic.In the experiments，it was found that lower initial pulp density and high inoculation amount were good for attaining high redox potential in a short time，and therefore were helpful to start the biooxidation process.

Key words:  biooxidation, refractory gold concentrate, arsenic, Acidithiobacillus ferrooxidans

CLC Number: 

  • TF831
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