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A Study on the Bioleaching of Cobalt and Copper from Cobalt Concentrate by Aspergillus niger strains

Aspergillus niger 균주를 이용(利用)한 코발트 정광(精鑛)으로부터 코발트 및 구리의 미생물(微生物) 침출(浸出) 연구(硏究)

  • Ahn, Hyo-Jin (Dept. of Advanced materials & Science. Daejin University) ;
  • Ahn, Jae-Woo (Dept. of Advanced materials & Science. Daejin University) ;
  • Bang, Duk-Ki (Dept. of Enviromental Eng., Daejin University) ;
  • Kim, Meong-Woon (Dept. of Enviromental Eng., Daejin University)
  • Received : 2013.01.21
  • Accepted : 2013.03.06
  • Published : 2013.04.30

Abstract

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 $24^{\circ}C$ after 15 days incubation.

Acknowledgement

Supported by : 지식경제부

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