Linking leach chemistry and microbiology of low-grade copper ore bioleaching at different temperatures
Linking leach chemistry and microbiology of low-grade copper ore bioleaching at different temperatures
复制标题
将不同温度下低品位铜矿石生物浸出的浸出化学和微生物学联系起来
DOI：
10.1007/s12613-018-1570-2
复制
发表时间：
2018
影响因子：
4.8
通讯作者：
Ruan Ren man
中科院分区：
文献类型：
--
作者：
Jia Yan;Sun He yun;Tan Qiao yi;Gao Hong shan;Feng Xing liang;Ruan Ren man
The effects of temperature on chalcocite/pyrite oxidation and the microbial population in the bioleaching columns of a low-grade chalcocite ore were investigated in this study. Raffinate from the industrial bioleaching heap was used as an irrigation solution for columns operated at 20, 30, 45, and 60°C. The dissolution of copper and iron were investigated during the bioleaching processes, and the microbial community was revealed by using a high-throughput sequencing method. The genera ofFerroplasma,Acidithiobacillus,Leptospirillum,Acidiplasma, andSulfobacillusdominated the microbial community, and the column at a higher temperature favored the growth of moderate thermophiles. Even though microbial abundance and activity were highest at 30°C, the column at a higher temperature achieved a much higher Cu leaching efficiency and recovery, which suggested that the promotion of chemical oxidation by elevated temperature dominated the dissolution of Cu. The highest pyrite oxidation percentage was detected at 45°C. Higher temperature resulted in precipitation of jarosite in columns, especially at 60°C. The results gave implications to the optimization of heap bioleaching of secondary copper sulfide in both enhanced chalcocite leaching and acid/iron balance, from the perspective of leaching temperature and affected microbial community and activity.
