Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Bioleaching of Sphalerite by Moderately Thermophilic Bacteria

고온성 박테리아를 이용한 섬아연석의 용출 특성

  • Park, Cbeon-Young (Department of Energy and Resource Engineering, Chosun University) ;
  • Cheong, Kyung-Hoon (Department of Environmental Engineering and BK21 Team for Biohydrogen Production, Chosun University) ;
  • Kim, Bong-Ju (Department of Energy and Resource Engineering, Chosun University)
  • 박천영 (조선대학교 에너지자원공학과) ;
  • 정경훈 (조선대학교 환경공학과 BK21 바이오가스기반 수소생산사업팀) ;
  • 김봉주 (조선대학교 에너지자원공학과)
  • Received : 2010.09.07
  • Accepted : 2010.12.14
  • Published : 2010.12.28
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Abstract

Bioleaching experiments were effectively carried out at $42^{\circ}C$, $52^{\circ}C$ and $62^{\circ}C$ to leach the more valuable metal ions from sphalerite using bacteria. The pH values of the bioleaching solution were constantly maintained for 10 days in the range of 2.40 to 2.55. In these bioleaching experiments, rod-shaped bacteria attached to the sphalerite surface were continuously observed in the sample. Along with the increase in the leaching temperatures, the concentration of Zn and Pb increased in the control sample of leachates, whereas the concentration of Fe increased in the sample containing bacteria. At $42^{\circ}C$, $52^{\circ}C$ and $62^{\circ}C$ the biological leaching content of Zn was found to be 9.5, 2.8 and 2.9 times higher than that in the chemical leaching content, respectively. At these temperatures, the content of Pb in the bacterial sample of the leachate was detected to be 14.8, 7.4 and 3.8 times higher than that of the control sample of the leachate, respectively.

고온성박테리아를 이용하여 섬아연석으로부터 유용금속이온을 효과적으로 용출시키기 위하여 $42^{\circ}C$, $52^{\circ}C$, $62^{\circ}C$에서 미생물용출실험을 각각 수행하였다. 이때 미생물용출실험이 진행되는 10일 동안, 용출액의 pH는 2.40에서 2.5 범위를 유지하였으며 미생물 용출실험이 종료될 때까지 막대 모양의 박테리아들이 섬아연석 표면에 부착되어 있는 것이 계속해서 관찰되었다. 용출온도를 $42^{\circ}C$, $52^{\circ}C$, $62^{\circ}C$로 증가시키면, 비교시료에서 용출 함량이 증가되는 금속은 Zn과 Pb이고, 박테리아 용출 시료에서는 Fe 용출 양이 증가하였다. 용출 온도를 $42^{\circ}C$, $52^{\circ}C$, $62^{\circ}C$로 증가시켰을 때, Zn 이온은 비교시료에서 보다 박테리아 용출 시료에서 각각 9.5배, 2.8배, 2.9배 이상으로 높게 용출되었고, Pb 이온은 비교시료에서 보다 박테리아 용출 시료에서 각각 14.8배, 7.4 배, 3.8배 이상으로 높게 용출되었다. Fe 이온의 비교시료에서 용출 온도를 $42^{\circ}C$, $52^{\circ}C$, $62^{\circ}C$로 증가시켜도 전혀 용출되지 않았지만, 박테리아 Fe 함량이 온도에 비례하여 증가하였다.

Keywords

Acknowledgement

Supported by : 조선대학교

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