Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 4 No. 3 September 1994|
（1.Deptartment.of Nonferrous Metallurgy; Central South University of Technology; 410083 Changsha
2.Microbilolgy Institute; Academia Sinica; Beijing 100080）
Abstract:The influence of pulp density , ferric ion concentration and particle size on the tank bioleaching of two kinds of refractory gold concentrates are discussed. The chemistry and mechanism of bioleaching process are also presented. The relationship between oxidation of sulfides, liberation of enclosed gold and gold cyanidation are discussed. The consumption of NaCN could be reduced by alkaline pretreatment of bioleached residues prior to cyanidation.
Key words: gold bacterial leaching refractory gold ores