African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12291

Full Length Research Paper

Comparsion of bioleaching of copper sulphides by Acidithiobacillus ferrooxidans

Kaibin Fu*
  • Kaibin Fu*
  • Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
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Hai Lin
  • Hai Lin
  • School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
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Deqiang Luo
  • Deqiang Luo
  • Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
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Wufei Jiang
  • Wufei Jiang
  • Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
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Ping Zeng
  • Ping Zeng
  • Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
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  •  Accepted: 05 September 2013
  •  Published: 29 January 2014

Abstract

Bioleaching of copper sulphides were investigated. The results show that the copper extraction from djurleite, bornite, covellite and chalcopyrite under the optimal conditions were 95.12, 84.5, 54.1, and 18.33%, respectively. A ranking for the bioleaching of copper sulfides was obtained: djurleite > bornite > covellite > chalcopyrite. A determination of the extent of adsorption of A. ferrooxidans on the surface of the minerals showed that the cell density of Acidithiobacillus ferrooxidans on djurleite was the highest. The order of adsorption on the copper sulphides was: djurleite > bornite > covellite > chalcopyrite. The results suggest a difference in affinity of bacteria for different copper sulphides. The higher the leaching rate of copper sulphides, the greater the density of bacteria absorbed on the surface of minerals.

 

Key words: Bioleaching, copper sulphides, Acidithiobacillus ferrooxidans, cell density, copper extraction.

Abbreviation

Abbreviations: XRD, X-ray diffraction; AAS, atomic absorption spectrometry; ORP, oxidation reduction potential; SEM, scanning electron microscopy.