Two-Stage Process of Bacterial-Chemical Oxidation of Refractory Pyrite-Arsenopyrite Gold-bearing Concentrate

被引：6
|
作者：
Zaulochnyi, P. A. [1 ]
Bulaev, A. G. [2 ]
Savari, E. E. [1 ]
Pivovarova, T. A. [2 ]
Kondratieva, T. F. [2 ]
Sedelnikova, G. V. [1 ]
机构：
[1] Cent Res Inst Geol Prospecting Base & Precious Me, Moscow 117545, Russia
[2] Russian Acad Sci, Winogradsky Inst Microbiol, Moscow 117312, Russia
来源：
APPLIED BIOCHEMISTRY AND MICROBIOLOGY | 2011年 / 47卷 / 09期
关键词：
arsenopyrite; bioleaching; chemolithotrophic acidophilic microorganisms; moderately thermophilic microorganisms; pyrite; refractory gold-bearing concentrate;
D O I：
10.1134/S0003683811090080
中图分类号：
Q81 [生物工程学（生物技术）]; Q93 [微生物学];
学科分类号：
071005 ; 0836 ; 090102 ; 100705 ;
摘要：
A technology for tank biooxidation of refractory gold-bearing concentrate under variable temperature conditions has been improved: the temperature of the first of two stages was changed from 30 degrees C to 34-36 degrees C. Gold in this concentrate is mainly associated with sulfide minerals: arsenopyrite and pyrite, which underlies a low gold recovery (16.68%) as a result of cyanidation. To resolve the problem, an association of mesophilic acidophilic chemolithotrophic microorganisms and moderately thermophilic bacteria of the Sulfobacillus genus were used for the concentrate oxidation. The composition of the used microbial association was studied; it was shown that it depends upon temperature: at 42 degrees C, the population of the mesophilic thiobacteria decreased, whereas that of thermophilic sulfobacilli enhanced as compared to 36 degrees C. The accepted scheme of the process ensures a high extent of gold recovery (94.6%) within a short space of time for biooxidation (96 h).
引用
收藏
页码：833 / 840
页数：8
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