Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Recovery of Gold from Refractory Arsenic Gold Concentrate by a Process of Thiobacillus Ferrooxidans Oxidation - Cyanidation

  • Zhang, Chuanfu (Department of Metallurgical Science & Engineering Central South University) ;
  • Min, Xiaobo (Department of Metallurgical Science & Engineering Central South University) ;
  • Chai, Liyuan (Department of Metallurgical Science & Engineering Central South University) ;
  • Chen, Weiliang (Department of Metallurgical Science & Engineering Central South University) ;
  • Okido, Masazumi (Nagoya University)
  • Published : 2001.10.01
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Abstract

A novel fluidized-bed reactor was designed and installed for bioleaching in a semi-continuous way, by which a process for bioleaching-cyanidation of Guangxi Jinya refractory gold arsenical concentrate was studied. An arsenic extraction rate reaches 82.5% after 4-day batch biooxidation of the concentrate under the optimized condition of pH 2.0, ftrric ion concentration 6.5g/L and pulp concentration 10%. And leaching rate of gold in the following gold cyanidation is over 90%. The parameters of three series fluid-bed reactors exhibit stability during the semi-continuous bioleaching of the concentrate. Arsenic in the concentrate can be got rid of 91% after 6-day leaching. Even after 4 days, 82% of arsenic extraction rate was still obtained. The recovery rates of gold are 92% and 87.5% respectively in cyaniding the above bioleached residues. The results will provide a base for further commercial production of gold development.

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