황산화균 Acidithiobacillus thiooxidans를 이용한 Boleo 저품위 산화동광 내 구리 및 망간의 동시추출 연구
A Study on Simultaneous Bioleaching of Copper and Manganese from Boleo Low-Grade Copper Oxide Ore Using Sulfur-Oxidizing Bacterium Acidithiobacillus thiooxidans
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황산화균인 Acidithiobacillus thiooxidans를 이용한 미생물학적 용출법을 적용시켜 Boleo 저품위 산화동광 내 구리와 망간의 동시추출이 가능한지 확인하였다. 산화동광 내 구리와 망간은 각 2~3% 존재하며 광물형태는 주로 인산염, 규산염, 산화광물 형태였다. 신선한 배양액 내에서 A. thiooxidans는 산화동광에서 구리를용출시켰으나 망간 용출량은 낮았다. 투입하는 미생물 수를 증가시키거나 효모추출물을 첨가한 결과 구리와망간 용출량이 다소 증가하였으며 효모추출물 첨가 시 높은 효율을 보였다. 용출된 망간은 용존 상태보다 콜로이드 상태로 존재하였다. A. thiooxidans를 한 달간 배양한 배양액을 산화동광에 적용한 결과 가장 낮은 pH를 보였으며 구리뿐만 아니라 용존 상태 망간의 용출효율도 대폭 증가하였다. 이 효율 증진은 배양액의 화학적 조성보다배양액 내 A. thiooxidans의 대사작용에 기인하였다. 이러한 결과는 Boleo의 저품위 산화동광으로부터 구리 및망간을 동시 추출하는 데 있어 미생물학적 용출법이 적용 가능함을 나타내는 것이다.
Abstract
Simultaneous bioleaching of Cu and Mn from Boleo low-grade Cu oxide ore was investigated using a sulfur-oxidizing bacterium Acidithiobacillus thiooxidans. The amounts of Cu and Mn were 2~3% in the ore as phosphates, silicates, and oxides. A. thiooxidans leached Cu with less amount of Mn in fresh culture medium. Increase of inoculated bacterial cells or addition of yeast extract to the culture medium increased the amounts of Cu and Mn extracted from the ore. Extracted Mn existed dominantly as colloidal suspensions rather than dissolved phase. When bacterial culture incubated for one month was applied to the ore with medium, the lowest pH appeared and the extraction efficiency of dissolved Cu and Mn was significantly enhanced. Such enhancement was attributed to bacterial metabolism instead of chemical composition of culture medium itself. The results indicated that bioleaching may be efficiently applied to lixiviate Cu and Mn simultaneously from Boleo Cu oxide ore.
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