文献类型：期刊文献

英文题名：Bioleaching of Major, Rare Earth, and Radioactive Elements from Red Mud by using Indigenous Chemoheterotrophic Bacterium Acetobacter sp.

作者：Qu, Yang Li, Hui Wang, Xiaoqing Tian, Wenjie Shi, Ben Yao, Minjie Zhang, Ying

第一作者：Qu, Yang

通信作者：Qu, Y[1]

机构：[1]Luoyang Inst Sci & Technol, Dept Environm Engn & Chem, Luoyang 471023, Peoples R China;[2]Univ Chinese Acad Sci, Chengdu Inst Biol, Key Lab Environm & Appl Microbiol, Environm Microbiol Key Lab Sichuan Prov, Chengdu 610041, Sichuan, Peoples R China;[3]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Luoyang Inst Sci & Technol, Dept Environm Engn & Chem, Luoyang 471023, Peoples R China

通信机构：corresponding author), Luoyang Inst Sci & Technol, Dept Environm Engn & Chem, Luoyang 471023, Peoples R China.

年份：2019

卷号：9

期号：2

外文期刊名：MINERALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000460799000001)】；

基金：This research was funded by Natural Science Foundation of China (41701306, 51804155), Breakthrough of Science and Technology of Henan Province (172102310247, 182102311035), Key Scientific Research Projects of Univiersity in Henan (16A610010, 17B610007, 15A180049).

语种：英文

外文关键词：chemoheterotrophic bacterium; Acetobacter; red mud; bioleaching; radioactive elements

摘要：The aim was to study the bioleaching performance of chemoheterotrophic bacterium involved in leaching of major, rare earth, and radioactive elements from red mud (RM), and to explore the underlying mechanism. An acid-producing bacterium, identified as Acetobacter sp., was isolated from RM impoundment and used in the bioleaching experiments under one-step, two-step and spent medium process at up to 10% pulp density. The results showed that the leaching ratios of Al, Lu, Y, Sc, and Th were 55%, 53%, 61%, 52%, and 53% respectively under one-step process at 2% pulp density. Under both one- and two-step processes at 2% pulp density, the radioactivity of bioleached RM can meet the relevant regulation in China. The total amount of organic acids excreted by Acetobacter sp. increased with an increase of RM pulp density. After bioleaching, contents of hematite and gibbsite decreased but perovskite increased in RM. Micromorphology analysis indicated that the cells of Acetobacter sp. adhered to RM particles and formed large-size aggregates, and a new crystal of weddellite emerged. In view of the shorter lag phase and smaller biomass comparing to fungi even under direct contact with RM, bacterium Acetobacter sp. is supposed to apply to in situ heap or dump bioleaching of RM.