文献类型：期刊文献

英文题名：Mechanism underlying the bioleaching process of LiCoO2 by sulfur-oxidizing and iron-oxidizing bacteria

作者：Wu, Weijin[1];Liu, Xiaocui[1];Zhang, Xu[1];Li, Xiyan[1];Qiu, Yongqiu[1];Zhu, Minglong[1];Tan, Wensong[1]

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

年份：2019

卷号：128

期号：3

起止页码：344

外文期刊名：JOURNAL OF BIOSCIENCE AND BIOENGINEERING

收录：;EI(收录号：20191706812870);WOS:【SCI-EXPANDED(收录号:WOS:000487575700013)】；

基金：This study was supported by the Open Project Funding of the State Key Laboratory of Bioreactor Engineering of China, the National High Technology Research and Development Program of China (No. 2007AA060904 and 2012AA061503) and NSFC21878083. The authors would also like to thank Professor Tingyue Gu (Department of Chemical and Biomolecular Engineering, Ohio University, Athens, OH, USA) for revision of the manuscript.

语种：英文

外文关键词：Bioleaching; LiCoO2; Pyrite; Sulfur-oxidizing and iron-oxidizing bacteria; Extracellular polymeric substances

摘要：Benefiting from lower operational costs and energy requirements than do hydrometallurgical and pyrometallurgical processes in metal recovery, the bioleaching of LiCoO2 through the use of sulfur -oxidizing and iron -oxidizing bacteria has drawn increasing attention. However, the bioleaching mechanism of LiCoO2 has not been clearly elaborated. In the present study, the effects of the energy source of bacteria, such as Fe2+, pyrite and S, and. the products of bacterial oxidation, such as Fe3+ and sulfuric acid, on the chemical leaching of LiCoO2 were studied. The results indicated that lithium was dissolved by acid, and cobalt was released by the reduction of Fe2+ and acid dissolution. The recovery of Li+ and CO2+ could be significantly improved by pH adjustment. Finally, optimal recoveries of Li+ and CO2+ were observed in the pyrite group, reaching 91.4% and 94.2%, respectively. By using pyrite as the energy source, the role of bacteria in bioleaching of LiCoO2 was investigated. The results showed that bacteria could produce sulfuric acid by oxidizing pyrite to promote the mobilization of Li+ and CO2+. The recovery of lithium and cobalt could be increased to 100.0% and 99.3% by bacteria. Moreover, extracellular polymeric substances secreted by bacteria were found to be a factor for the improvement of Li+ and CO2+ recovery. (C) 2019, The Society for Biotechnology, Japan. All rights reserved.