Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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The Leaching of Valuable Metal from Mine Waste Rock by the Adaptation Effect and the Direct Oxidation with Indigenous Bacteria

토착박테리아의 중금속 적응효과와 직접산화작용에 의한 폐광석으로부터 유용금속 용출

  • 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)
  • 김봉주 (조선대학교 에너지.자원공학과) ;
  • 조강희 (조선대학교 에너지.자원공학과) ;
  • 최낙철 (서울대학교 지역시스템공학과) ;
  • 박천영 (조선대학교 에너지.자원공학과)
  • Received : 2015.04.15
  • Accepted : 2015.09.11
  • Published : 2015.09.30
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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.

폐광산에 방치되어 있는 폐광석으로부터 유용금속이온을 그 지역 토착박테리아를 이용하여 효과적으로 용출시키고자 하였다. 토착호산성박테리아를 중금속 이온에 내성이 형성될 수 있도록 중금속 이온에 주기적으로 반복 적응시켰다. 그 결과 적응실험이 진행될수록 성장-배양액의 pH가 더 안정적으로 감소하였다. $CuSO_4{\cdot}5H_2O$에 9주와 12주 동안 적응시킨 박테리아를 이용하여 42일 동안 미생물용출을 수행한 결과, 용출-배양액의 pH는 적응 횟수에 비례하여 더 빠르게 감소하였다. 황동석과 Cu 함량이 고성 폐광석에 비하여 상대적으로 적게 포함된 연화 폐광석에서 더 많은 박테리아들이 부착하였고, 또한 Cu와 Fe 함량은 고성 박테리아 시료(각각의 용출률 = 66.77%와 21.83%)에 비하여 연화 박테리아 시료(각각의 용출률 = 92.79%와 55.88%)에서 더 많이 용출되었다. 따라서 중금속으로 오염된 광산에 오랫동안 서식한 토착호산성 박테리아를 이용한다면 또한 이 박테리아들을 목적중금속 이온이 포함된 성장-배양액에 계속하여 주기적으로 적응시킨다면, 폐광석으로부터 유용금속이온을 더 효과적으로 용출시킬 수 있을 것으로 확신한다.

Keywords

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