文献类型：期刊文献

英文题名：Effect of agitation intensity on the biooxidation process of refractory gold ores by Acidithiobacillus ferrooxidans

作者：Sun, Li-Xin[1];Zhang, Xu[1];Tan, Wen-Song[1];Zhu, Ming-Long[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：127

起止页码：99

外文期刊名：HYDROMETALLURGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000310410000014)】；

基金：This study was financially supported by the Open Project Funding of State Key Laboratory of Bioreactor Engineering of China and the National High Technology Research and Development Program of China (No. 2007AA060904 and No. 2012AA061503).

语种：英文

外文关键词：Refractory sulfide gold ores; Agitation intensity; Biooxidation process; Acidithiobacillus ferrooxidans

摘要：Various views persist about the effect of the agitation intensity on the mineral biooxidation process, but the mechanism remains unclear. In this study, the effects of the agitation intensity on the biooxidation process of refractory gold ores by Acidithiobacillus ferrooxidans were investigated in experimental stirred tank bioreactors (STRs). The results demonstrated that both the biooxidation rates and the concentration of cells decreased with the agitation intensity. The higher agitation intensity not only damaged the suspended cells but also prevented the adsorption of cells onto the mineral surface. The oxygen uptake rate (OUR), the Fe2+ oxidation activity and the rus gene expression of A. ferrooxidans decreased with the agitation intensity during the biooxidation process, which might be responsible for the decrease of the biooxidation rates with the agitation intensity. (C) 2012 Elsevier B.V. All rights reserved.