Effect of free and attached moderate thermophilic microorganisms on metal solubilization in bioleaching system for zinc smelting slag under different pH
Bioleaching with moderate thermophilic bacteria is a potential technology for recycling valuable metals from smelting slag. In this study, a series of shake flask experiments were conducted using long-term acclimatized moderate thermophilic bacteria to investigate the effect of pH on bacteria activities and solubilization of Cu and Zn from Zn smelting slag. The results show that moderate thermophilic bacteria population could reach as high as 1. 5 x 108 cells/mL under pH 1.0, which was about 4 times and 15 times of that in condition of pH 1. 5 and pH 2. 0, respectively. The amount of attached bacteria on slag surface in the bioleaching system is slightly changed in 3 days, and the amount of attached bacteria was positively related with the total bacteria population. The extraction percentages of Cu and Zn from slag reach as high as 95 ％ in 3 days bioleaching with pH 1. 0. The extraction of Zn was mainly related with the attached bacteria on the smelting slag surface while that of Cu was integrated with both free and attached bacteria, respectively. The images of SEM for slag indicated that the role of attached bacteria in bioleaching system is significant.
moderate thermophilic bacteria bioleaching Zn smelting slag
Kaiqi Jiang Zhaohui Guo Yi Cheng Long Zhang Xiyuan Xiao
Institute of Environmental Engineering, School of Metallurgical Science and Engineering,Central South University, 410083, Changsha, China
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
428-433
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）