Efficient dealkalization of red mud and recovery of valuable metals by a sulfur-oxidizing bacterium

doi:10.3389/fmicb.2022.973568

	Efficient dealkalization of red mud and recovery of valuable metals by a sulfur-oxidizing bacterium
	Zhang, Duo-rui 1,2; Chen, Hong-rui 1,2; Xia, Jin-lan 1,2; Nie, Zhen-yuan 1,2; Zhang, Rui-Yong 1,2,3,4; Pakostova, Eva 5
	2022-08-29
发表期刊	FRONTIERS IN MICROBIOLOGY
卷号	13 页码:15
通讯作者	Xia, Jin-lan(jlxia@csu.edu.cn)
摘要	Red mud (RM) is a highly alkaline polymetallic waste generated via the Bayer process during alumina production. It contains metals that are critical for a sustainable development of modern society. Due to a shortage of global resources of many metals, efficient large-scale processing of RM has been receiving increasing attention from both researchers and industry. This study investigated the solubilization of metals from RM, together with RM dealkalization, via sulfur (S-0) oxidation catalyzed by the moderately thermophilic bacterium Sulfobacillus thermosulfidooxidans. Optimization of the bioleaching process was conducted in shake flasks and 5-L bioreactors, with varying S-0:RM mass ratios and aeration rates. The ICP analysis was used to monitor the concentrations of dissolved elements from RM, and solid residues were analyzed for surface morphology, phase composition, and Na distribution using the SEM, XRD, and STXM techniques, respectively. The results show that highest metal recoveries (89% of Al, 84% of Ce, and 91% of Y) were achieved with the S-0:RM mass ratio of 2:1 and aeration rate of 1 L/min. Additionally, effective dealkalization of RM was achieved under the above conditions, based on the high rates (>95%) of Na, K, and Ca dissolution. This study proves the feasibility of using bacterially catalyzed S-0 oxidation to simultaneously dealkalize RM and efficiently extract valuable metals from the amassing industrial waste.
关键词	red mud (bauxite residue) bioleaching dealkalization metal recovery sulfur bio-oxidation
DOI	10.3389/fmicb.2022.973568
收录类别	SCI
语种	英语
WOS研究方向	Microbiology
WOS类目	Microbiology
WOS记录号	WOS:000871568100001
出版者	FRONTIERS MEDIA SA
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/180600
专题	海洋环境腐蚀与生物污损重点实验室
通讯作者	Xia, Jin-lan
作者单位	1.Cent South Univ, Sch Minerals Proc & Bioengn, Changsha, Peoples R China 2.Cent South Univ, Key Lab Biomet, Minist Educ China, Changsha, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao, Peoples R China 4.Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Marine Corros & Protect, Qingdao, Peoples R China 5.Coventry Univ, Ctr Sport Exercise & Life Sci, Coventry, England
推荐引用方式 GB/T 7714	Zhang, Duo-rui,Chen, Hong-rui,Xia, Jin-lan,et al. Efficient dealkalization of red mud and recovery of valuable metals by a sulfur-oxidizing bacterium[J]. FRONTIERS IN MICROBIOLOGY,2022,13:15.
APA	Zhang, Duo-rui,Chen, Hong-rui,Xia, Jin-lan,Nie, Zhen-yuan,Zhang, Rui-Yong,&Pakostova, Eva.(2022).Efficient dealkalization of red mud and recovery of valuable metals by a sulfur-oxidizing bacterium.FRONTIERS IN MICROBIOLOGY,13,15.
MLA	Zhang, Duo-rui,et al."Efficient dealkalization of red mud and recovery of valuable metals by a sulfur-oxidizing bacterium".FRONTIERS IN MICROBIOLOGY 13(2022):15.