시안생성미생물을 이용한 금 회수기술 연구동향
Recovery Technologies of Gold Using Cyanogenic Microorganisms: A Review
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초록
시안생성미생물은 대사작용에 의해 시안을 생성하는 미생물로서 금의 생물학적 직접침출이 가능하다. 시안생성은 글리신과 메티오닌을 함께 기질로 사용할 때 가장 활발하며, 철 이온은 미생물의 시안생성을 촉진하는 것으로 알려졌으나 시안생성 메카니즘은 정확히 알려져 있지 않다. 이 글에서는 시안생성미생물을 이용한 천연자원 및 순환자원으로부터 금 등의 유가금속 회수에 미치는 pH, 박테리아 종류, 금속 이온, 용존산소농도 등의 영향에 대하여 지금까지 발표된 연구결과를 정리하고 고찰하였다.
Abstract
Cyanogenic microorganisms produce cyanide by their metabolism, so they extract directly gold. Glycine and methionine are the most appropriate substrate among those reported for producing cyanide, and it has been found that iron ions stimulate the bio-cyanogenic process, but the mechanisms are not clear. In the present article, the effects of pH, bacterial strain, metal ions, dissolved oxygen concentration on the recovery of gold from natural or recyclable resources by the cyanogenic microorganisms were summarized and discussed.
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