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The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions
Cao, Shaotao1,2; Ma, Haijun3; Zhang, Yi3; Chen, Xiaofan3; Zhang, Yifei1,2; Zhang, Yi1,2
2013-11-01
Source PublicationHYDROMETALLURGY
Volume140Issue:0Pages:111-119
AbstractThe phase transitions of the main substances in Bayer red mud in high caustic sodium aluminate solutions were studied. Without addition of lime, cancrinite was not found to transform to CaNaHSiO4 even with 16 wt.% CaO present in the original residue up to 270 degrees C. However, this transition was verified to be a fast reaction which was completed in just 10 min with the temperature higher than 240 degrees C after adding lime, thus enabling the extraction of Al2O3 from the red mud. Whether additional CaO was supplemented or not, the isomorphous substitution of Fe to Al atoms occurred in hydrated andradite as long as the temperature was more than 240 degrees C, providing another way to extract Al2O3 from Bayer red mud. Accordingly the A/S (weight ratio of solid Al2O3 to SiO2) of red mud would reduce to 0.134 after the complete transition from Ca2.93Al1.97Si0.64O2.56(OH)(9 44) to Ca-3(Fe0.87Al0.13)(2)(SiOL4)(1.65)(OH)(5.4) in our study, assuming no other Al or Si containing phases. Furthermore, the addition of CaNaHSiO4 seed was confirmed to accelerate both the transition of cancrinite to CaNaHSiO4 and the reaction of isomorphous substitution in the andradite. (C) 2013 Elsevier B.V. All rights reserved.
KeywordBayer Red Mud Phase Transition Cancrinite Canahsio4 Hydrated Andradite
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
Language英语
WOS KeywordCANCRINITE ; SOLUBILITY ; SODALITE ; TRANSFORMATION ; RECOVERY ; ALUMINOSILICATE ; CRYSTALLIZATION ; TEMPERATURE ; HYDROGARNET ; DIGESTION
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000328588700016
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13572
Collection研究所(批量导入)
Affiliation1.Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Coalmine Alumina Co, Sanmenxia 472100, Henan Province, Peoples R China
Recommended Citation
GB/T 7714
Cao, Shaotao,Ma, Haijun,Zhang, Yi,et al. The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions[J]. HYDROMETALLURGY,2013,140(0):111-119.
APA Cao, Shaotao,Ma, Haijun,Zhang, Yi,Chen, Xiaofan,Zhang, Yifei,&Zhang, Yi.(2013).The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions.HYDROMETALLURGY,140(0),111-119.
MLA Cao, Shaotao,et al."The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions".HYDROMETALLURGY 140.0(2013):111-119.
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