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This study was to investigate the bioleaching for chalcopyrite using subcultured indigenous acidophilic bacteria without addition of sulfuric acid at room temperature. Even through these condition, the possibility of bioleaching was identified to leach the usable metal ions from chalcopyrite concentrate. The indigenous bacteria were collected from the acid mine drainage, mine waste soil, coal waste and hot spring in the Korea and Japan, and cultured in the growth-medium at 32℃. On the indigenous bacteria growing in the growth-medium at 32℃, the pH value was gradually decreased over time and the Eh value increased with time. After 28 days inoculation with chalcopyrite column without sulfuric acid at room temperature, the content of Fe, Zn, Cu and As enriched 184, 6, 3.3 and 2.7 times more in the bacterial sample than the control sample. Accordingly, it is respected that the heap and dump leaching will be possible to leach the usable metal ions from the experiment no addition sulfur acid at room temperature.
계대배양 된 토착박테리아들을 황동석이 충진 된 칼럼에 접종하고 상온에서 그리고 황산을 첨가하지 않고 용출실험을 실시하였다. 비록 이런 조건에도 불구하고, 미생물에 의하여 황동석 정광으로부터 유용금속 이온이 용출될 수 있는지를 확인하고자 하였다. 한국과 일본지역에서 광산산성배수, 광산폐석토양, 폐석탄 및 온천수에 서식하는 토착박테리아들을 성장-배양액에서 32℃로 배양하였다. 성장-배양액에서 토착박테리아가 성장함에 따라 pH가 감소하고 Eh는 증가하였다. 토착박테리아를 황동석 칼럼에 28일 동안 반응시킨 결과 비교시료에서 보다 박테리아 시료에서 Fe 이온은 184 배 이상으로, Zn은 6배 이상으로, Cu는 3.3 배 이상으로 그리고 As는 2.7배 이상으로 용출되었다. 따라서, 상온에서 그리고 황산을 첨가하지 않은 실험 조건에서 heap leaching이나 dump leaching으로부터 유용금속을 용출시킬 수 있을 것으로 기대된다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 47
- No :5
- Pages :678-689


Journal of the Korean Society of Mineral and Energy Resources Engineers







