Evaluation of chemical immobilization treatments for reducing arsenic transport in red mud

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Evaluation of chemical immobilization treatments for reducing arsenic transport in red mud
	Li, Yiran ; Wang, Jun ; Su, Yi ; Peng, Xianjia ; Liu, Jinhui ; Luan, Zhaokun
刊名	ENVIRONMENTAL EARTH SCIENCES
	2013
卷号	70 期号:4 页码:1775-1782
通讯作者	Wang, J
中文摘要	Red mud (RM) was produced during alumina production from bauxite known as the Bayer process. Arsenic was detected in the solid phase of RM (RMsf) which was disposed in the disposal area. This study investigates the effectiveness of using Zero-valent iron (ZVI), ferrihydrite, ferrous sulfate (FeSO4), waste acid (WA) or CO2 for immobilization of arsenic in the RMsf. To test the effect of the amendments on the arsenic leachability, the RMsf samples were amended with the iron-based materials or acidifiers at various w/w (weight/weight) ratios (1-10 %) for 30 days. The leachability of arsenic in the RMsf was evaluated by a 4-step water elusion process. After 30-day treatment of the RMsf, the leachability of As decreased from an initial (12.7 %) to (7.0 %) with a w/w ratio of 5 % ZVI (0 %) with 5 % FeSO4 center dot 7H(2)O, (3.4 %) with 5 % ferryhydrite, (2.0 %) with 6 % WA and (11.8 %) with 6 % CO2. FeSO4 center dot 7H(2)O and WA showed more effectively than other amendments for immobilizing arsenic. Arsenic fractionation with a sequential extraction procedure was used to evaluate the arsenic migration potential in the RMsf. FeSO4 and WA were effective in increasing the hydrous oxide combined arsenic in the RMsf. The leachable Cl- and SO4 (2-) in the RMsf increased from 2.9 to 14.1 mg/g and 19.9-44.4 mg/g with 6 % WA and 5 % FeSO4 center dot 7H(2)O added, respectively. The estimated cost of the FeSO4 and WA treatment was 0.47 and 0.49 USD per ton, respectively.
收录类别	SCI
WOS记录号	WOS:000325074400029
公开日期	2014-06-06
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/7413]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Li, Yiran,Wang, Jun,Su, Yi,et al. Evaluation of chemical immobilization treatments for reducing arsenic transport in red mud[J]. ENVIRONMENTAL EARTH SCIENCES,2013,70(4):1775-1782.
APA	Li, Yiran,Wang, Jun,Su, Yi,Peng, Xianjia,Liu, Jinhui,&Luan, Zhaokun.(2013).Evaluation of chemical immobilization treatments for reducing arsenic transport in red mud.ENVIRONMENTAL EARTH SCIENCES,70(4),1775-1782.
MLA	Li, Yiran,et al."Evaluation of chemical immobilization treatments for reducing arsenic transport in red mud".ENVIRONMENTAL EARTH SCIENCES 70.4(2013):1775-1782.