Bioleaching of chalcopyrite by mixed culture of moderately thermophilic microorganisms

来源期刊：中南大学学报(英文版)2007年第4期

论文作者：邬长斌 曾伟民 周洪波 符波 黄菊芳 邱冠周 王淀佐

文章页码：474 - 474

Key words：bioleaching; moderately thermophilic microorganisms; acclimation; chalcopyrite; shake flask experiment; stirred tank reactor

Abstract: A mixed culture of moderately thermophilic microorganisms was enriched from acid mine drainages(AMDs) samples collected from several sulphide mines in China, and the bioleaching of chalcopyrite was conducted both in shake flask and bioreactor. The results show that in the shake flask, the mixture can tolerate 50 g/L chalcopyrite after being acclimated to gradually increased concentrations of chalcopyrite. The copper extraction increases obviously in bioleaching of chalcopyrite with moderately thermophilic microorganisms supplemented with 0.4 g/L yeast extract at 180 r/min, 74% copper can be extracted in the pulp of 50 g/L chalcopyrite after 20 d. Compared with copper extractions of mesophilic culture, unacclimated culture and acclimated culture without addition of yeast extract, that of accliniated culture with addition of yeast extract is increased by 53%, 44% and 16%, respectively. In a completely stirred tank reactor, the mass fraction of copper and total iron extraction reach up to 81% and 56%, respectively. The results also indicate that it is necessary to add a large amount of acid to the pulp to extract copper from chalcopyrite effectively.

基金信息：the National Natural Science Foundation of China
the National Basic Research Program of China