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Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO
Zhou, Bingxin1,2,3,4; Cao, Shaotao2,3; Chen, Fangfang2,3; Zhang, Fangfang2,3; Zhang, Yi2,3
2019-05-01
Source PublicationMINERALS
ISSN2075-163X
Volume9Issue:5Pages:15
AbstractRecovering 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.
Keywordrecovering alkali Bayer red mud reaction kinetics magnesium oxide hydrotalcite-like compounds
DOI10.3390/min9050269
Language英语
WOS KeywordBAUXITE REFINERY RESIDUES ; AL-OXIDES ; NEUTRALIZATION ; HYDROXIDE ; ALUMINUM ; ANIONS ; WASTE
Funding ProjectNational 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 Research AreaMineralogy ; Mining & Mineral Processing
WOS SubjectMineralogy ; Mining & Mineral Processing
Funding OrganizationNational 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
WOS IDWOS:000477902800024
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/30400
Collection中国科学院过程工程研究所
Corresponding AuthorCao, Shaotao
Affiliation1.Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
4.Natl Engn Res Ctr Distillat Technol, Tianjin 300072, Peoples R China
Recommended Citation
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.
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