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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Bioleaching of refractory gold ore(Ⅲ) ——Fluid leaching Jinya refractory gold
concentrate by Thiob acillus ferrooxidans
MIN Xiao-bo(闵小波)1, CHAI Li-yuan(柴立元)1,
CHEN Wei-liang(陈为亮)1, YU Xia(于  霞)1,
ZHANG Chuan-fu(张传福)1, KUANG Zhong(邝 

1.Department of Metallurgical Science & Engineering,
Central South University,Changsha 410083, China;
2.Guangxi Guanghe Industry Co. Lt. Hechi, China, 547000

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 Jinya refractory gold arsenical concentrate was studied. The arsenic extraction rate reaches 82.5% after 4-day batch biooxidation of the concentrate under the optimized condition of pH 2.0, ferric ion concentration 6.5g/L and pulp concentration 10%. And leached rate of gold in the following cyanidation is over 90%. The parameters of three series fluidized-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.

 

Key words: refractory arsenical gold concentrate; fluid-bed reactor; semi-continuous bioleaching

ISSN 1672-7029
CN 43-1423/U

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