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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제26권 제11호
- 발행연도
- 2016.1
- 수록면
- 1,871 - 1,880 (10page)
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초록· 키워드
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Bio-oxidation is an effective technology for treatment of refractory gold concentrates.
However, the unsatisfactory oxidation rate and long residence time, which cause a lower cyanide leaching rate and gold recovery, are key factors that restrict the application of traditional bio-oxidation technology. In this study, the oxidation rate of refractory gold concentrates and the adaption of microorganisms were analyzed to evaluate a newly developed two-step pretreatment process, which includes a high temperature chemical oxidation step and a subsequent bio-oxidation step. The oxidation rate and recovery rate of gold were improved significantly after the two-step process. The results showed that the highest oxidation rate of sulfide sulfur could reach to 99.01 % with an extreme thermophile microbial community when the pulp density was 5%. Accordingly, the recovery rate of gold was elevated to 92.51%. Meanwhile, the results revealed that moderate thermophiles performed better than acidophilic mesophiles and extreme thermophiles, whose oxidation rates declined drastically when the pulp density was increased to 10% and 15%. The oxidation rates of sulfide sulfur with moderate thermophiles were 93.94% and 65.73% when the pulp density was increased to 10% and 15%, respectively. All these results indicated that the twostep pretreatment increased the oxidation rate of refractory gold concentrates and is a potential technology to pretreat the refractory sample. Meanwhile, owing to the sensitivity of the microbial community under different pulp density levels, the optimization of microbial community in bio-oxidation is necessary in industry.
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참고문헌 (24)
참고문헌 신청
Acevedo F / 2004 / Optimization of pulp density and particle size in the biooxidation of a pyritic gold concentrate by Sulfolobus metallicus / World J. Microbiol. Biotechnol
Ahmadi A / 2011 / Conventional and electrochemical bioleaching of chalcopyrite concentrates by moderately thermophilic bacteria at high pulp density / Hydrometallurgy 106 : 8
Astudillo C / 2008 / Adaptation of Sulfolobus metallicus to high pulp densities in the biooxidation of a flotation gold concentrate / Hydrometallurgy 92 : 11 ~ 15
Basson P / 2013 / The effect of sulphate ions and temperature on the leaching of pyrite. III / Bioleaching. Hydrometallurgy 133 : 176 ~ 181
Boogerd F / 1990 / Oxygen and carbon dioxide mass transfer and the aerobic, autotrophic cultivation of moderate and extreme thermophiles: a case study related to the microbia
Ahmadi A / 2011 / Conventional and electrochemical bioleaching of chalcopyrite concentrates by moderately thermophilic bacteria at high pulp density / Hydrometallurgy 106 : 8
Astudillo C / 2008 / Adaptation of Sulfolobus metallicus to high pulp densities in the biooxidation of a flotation gold concentrate / Hydrometallurgy 92 : 11 ~ 15
Basson P / 2013 / The effect of sulphate ions and temperature on the leaching of pyrite. III / Bioleaching. Hydrometallurgy 133 : 176 ~ 181
Boogerd F / 1990 / Oxygen and carbon dioxide mass transfer and the aerobic, autotrophic cultivation of moderate and extreme thermophiles: a case study related to the microbia
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