Isolation of Iron Oxidization Bacterium and Bioleaching from Ni-Mo Tailings
Received:February 21, 2016  Revised:February 23, 2016
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DOI:doi:10.3969/j.issn.1007-7545.2016.07.005
KeyWord:Acidithiobacillus ferrooxidans; acclimatization; Ni-Mo tailings; bioleaching; mechanisms
              
AuthorInstitution
xuehongqi 贵州大学
yangaijiang 贵州大学
dengqiujing 贵州大学
yaowei 贵州江航环保科技有限公司
lidandan 贵州大学
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Abstract:
      One acidophilic thiobacillus bacterium isolated from acid mine drainage of nickel-molybdenum was identified as Acidithiobacillus ferrooxidans (A.f) by morphological and physiological characteristics analysis. It was domesticated applying Ni-Mo ore tailings and FeSO4?7H2O as energy sources. Bioleaching of Ni-Mo ore tailings with domesticated and non-domesticated A.f was carried out in shake flasks. The results show that domesticated A.f was more conducive to leaching metals from tailings, the sequence of leaching rate of four target metals is Ni>Zn>As>Mo with the maximum extraction rate of 62.41%, 55.66%, 41.87%, and 12.04%, which is 2~8 percent point higher than that of non-acclimated group. The bioleaching mechanisms were attributed to be oxidation by bacterial and chemical solubilization by microbially-produced H and Fe3 . H plays a dominant role in leaching of Ni and Zn from tailings, while leaching of As and Mo mainly relies on continued oxidation by Fe3 .
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