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2020 Vol.57, Issue 2

Research Paper

Application of Biological Oxidation for the Grade Improvement of Au and Ag in An Invisible Gold Concentrate

생물학적 산화를 활용한 비가시성 금정광 내 Au, Ag 품위 향상

Bong-Ju Kim1
Jang-Soon Kwon1
Yong-Kwon Koh1
Cheon-Young Park2*
김 봉주1
권 장순1
고 용권1
박 천영2*
1한국원자력연구원 방사성폐기물처분연구부
2조선대학교 에너지·자원공학과
* Corresponding Author
April 2020. pp. 149-158
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Abstract

To upgrade the contents of Au and Ag in an invisible gold concentrate, we conducted bioleaching using indigenous bacteria (Acidithiobacillus ferrooxidans). During the bioleaching, a manganese crust was used as oxidant. As the bioleaching of the gold concentrate progressed, the pH of the eluate medium decreased, while the contents of metal ions (e.g., Cu, Fe and Mn) in the eluate medium increased. After the completion of bioleaching, the contents of insoluble Au and Ag in the gold concentrate residue were higher and their grades improved by 33.1% as compared to the raw gold concentrate.

Keywords
bioleaching
gold concentrate
manganese crust
oxidation
grade improvement

비가시성 금정광 내 Au, Ag 등 유용금속의 품위를 향상시키기 위하여 토착박테리아(Acidithiobacillus ferrooxidans)를 활용한 생물학적 산화용출을 실시하였다. 이때, 산화용출 기작의 촉진을 위하여 심해저 망간각을 산화제로 첨가하여 반응 동안 발생하는 다양한 생지구화학 반응을 고찰하였다. 금정광의 산화용출 동안 용출용액의 pH는 감소하고, 용출용액 내 Cu, Fe, Mn 이온의 함량은 증가하다가 평형에 도달하였다. 박테리아 생물학적 산화와 망간각 산화제가 첨가된 금정광의 용출실험 종료 이후 회수된 금정광 잔류물에서 Au와 Ag의 품위가 동일하게 33.1% 향상되었다.

키워드
미생물용출
금정광
망간각
산화
품위향상
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 57
  • No :2
  • Pages :149-158
  • Received Date :2020. 03. 20
  • Revised Date :2020. 04. 23
  • Accepted Date : 2020. 04. 24
  • DOI :https://doi.org/10.32390/ksmer.2020.57.2.149
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