Abstract
코발트 정광으로부터 코발트와 구리의 회수를 위하여 3종의 Aspergillus niger 균을 이용하여 각 금속의 침출거동을 조사하였다. 주요 실험 변수로는 균주 종류에 따른 유기산 생성량, pH 및 고액농도비 등 이었다. 실험결과 유기산(구연산 및 옥살산) 생성양의 경우 A. niger KCTC 6144가 Malt Extract Broth 배지에서 초기 pH 3.5에서 가장 좋았다. 한편 코발트 및 구리 침출실험결과로는 A. niger KCTC 6985를 사용한 경우가 효과적이었는데, 고액농도 10 g/L인 경우, pH 3.5, <TEX>$24^{\circ}C$</TEX>에서 약 15일 경과 후 코발트의 경우는 82%, 구리는 98%의 침출율을 나타내었다. Bioleaching behavior of metal ions for recovery of cobalt and copper from cobalt concentrate was investigated by employing three Aspergillus niger strains. Various factors, such as organic acid generation with fungi type, pH of the culture and pulp density were studied. The results showed that the best fungi for organic acid(citric acid and oxalic acid) generation was A. niger KCTC 6144 using Malt Extract Broth culture at initial pH 3.5. But A. niger KCTC 6985 was more effective for the leaching of cobalt and copper from cobalt concentrate. Our results showed that 82% cobalt and 98% copper was dissolved by A. niger KCTC 6985 at 10g/L pulp density, at pH 3.5 and <TEX>$24^{\circ}C$</TEX> after 15 days incubation.
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