Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO

doi:10.3390/min9050269

	Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO
	Zhou, Bingxin 1,2,3,4; Cao, Shaotao3,4 ; Chen, Fangfang3,4 ; Zhang, Fangfang 3,4; Zhang, Yi 3,4
刊名	MINERALS
	2019-05-01
卷号	9 期号:5 页码:15
关键词	recovering alkali Bayer red mud reaction kinetics magnesium oxide hydrotalcite-like compounds
ISSN号	2075-163X
DOI	10.3390/min9050269
英文摘要	Recovering alkali from Bayer red mud is crucial for storage security, resource utilization and environmental protection. In this study, the addition of MgO and/or CaO was conducted to recover alkali from red mud with a hydrothermal method for the first time. A synergistic result with a residual Na2O/SiO2 weight ratio of 0.03 was obtained by adding the blend of CaO and MgO at an appropriate temperature. MgO was found to be more temperature-dependent than CaO when substituting Na2O from red mud due to their different hydration processes. The alkali recovery was controlled by a reaction at a temperature of <200 degrees C and by internal diffusion at a higher temperature for MgO, but controlled by internal diffusion for CaO in the whole temperature range studied. The formation of hydrotalcite-like compounds with a loose structure was verified with the help of XRD, FTIR, and SEM-EDS. It was proved that both the reaction kinetics and the characteristics of solid products have a significant influence on the recovery of alkali.
资助项目	National Natural Science Foundation of China[51674233] ; Henan Transfer Project of CAS Scientific and Technological Achievements[2019103] ; Guangxi Natural Science Foundation[2016GXNSFEA380002] ; Shanxi Province Coal Based Low-carbon Technology Major Projects[MC2016-05]
WOS关键词	BAUXITE REFINERY RESIDUES ; AL-OXIDES ; NEUTRALIZATION ; HYDROXIDE ; ALUMINUM ; ANIONS ; WASTE
WOS研究方向	Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	MDPI
WOS记录号	WOS:000477902800024
资助机构	National Natural Science Foundation of China ; Henan Transfer Project of CAS Scientific and Technological Achievements ; Guangxi Natural Science Foundation ; Shanxi Province Coal Based Low-carbon Technology Major Projects
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/30399]
专题	中国科学院过程工程研究所
通讯作者	Cao, Shaotao
作者单位	1.Natl Engn Res Ctr Distillat Technol, Tianjin 300072, Peoples R China 2.Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 4.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Bingxin,Cao, Shaotao,Chen, Fangfang,et al. Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO[J]. MINERALS,2019,9(5):15.
APA	Zhou, Bingxin,Cao, Shaotao,Chen, Fangfang,Zhang, Fangfang,&Zhang, Yi.(2019).Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO.MINERALS,9(5),15.
MLA	Zhou, Bingxin,et al."Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO".MINERALS 9.5(2019):15.