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http://dx.doi.org/10.9727/jmsk.2015.28.3.209

The Leaching of Valuable Metal from Mine Waste Rock by the Adaptation Effect and the Direct Oxidation with Indigenous Bacteria  

Kim, Bong-Ju (Dept. of Energy and Resource Engineering, Chosun University)
Cho, Kang-Hee (Dept. of Energy and Resource Engineering, Chosun University)
Choi, Nag-Choul (Dept. of Rural Systems Engineering/Research Institute for Agriculture and Life Science, Seoul National University)
Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.28, no.3, 2015 , pp. 209-220 More about this Journal
Abstract
The aim of this study was leaching valuable metal ions from mine waste rocks which were abandoned mine site using indigenous aerobic bacteria. In order to tolerate the the indigenous aerobic bacteria to the heavy metal ions they were repeatedly adapted in $CuSO_4{\cdot}5H_2O$ environment. As the repeated generation-adaptation progressed, the pH values of the growth-medium were gradually decreased. During bio-leaching experiments with indigenous aerobic bacteria raised in a heavy metal ion environment for 42 days, the pH of the leaching solution was decreased while increasing the adaptation period. The indigeous bacteria were much more active on the surface of Younhwa waste rocks which contained relatively few the chalcopyrite and Cu content than the Goseong mine waste rocks, and also the amount of Cu and Fe ions were leached more in the Younhwa sample(leaching rate of 92.79% and 55.88%, respectively) than the Goseong sample(leaching rate of 66.77% and 21.83%, respectively). Accordingly, it is confirmed that valuable metal ions can be leached from the mine waste rocks, if any indigenous bacteria which inhabits a mine environment site for a long time with heavy metal ions can be used, and these bacteria can be progressively adapted in the growth-solutions containing the target heavy metals.
Keywords
mine waste rock; indigenous acidophilic bacteria; adaptation; bioleaching;
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Times Cited By KSCI : 7  (Citation Analysis)
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