The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions

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	The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions
	Cao, Shaotao 1,2; Ma, Haijun 3; Zhang, Yi 3; Chen, Xiaofan 3; Zhang, Yifei 1,2; Zhang, Yi 1,2
刊名	HYDROMETALLURGY
	2013-11-01
卷号	140 期号:0 页码:111-119
关键词	Bayer red mud Phase transition Cancrinite CaNaHSiO4 Hydrated andradite
英文摘要	The 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.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Metallurgy & Metallurgical Engineering
研究领域[WOS]	Metallurgy & Metallurgical Engineering
关键词[WOS]	CANCRINITE ; SOLUBILITY ; SODALITE ; TRANSFORMATION ; RECOVERY ; ALUMINOSILICATE ; CRYSTALLIZATION ; TEMPERATURE ; HYDROGARNET ; DIGESTION
收录类别	SCI
语种	英语
WOS记录号	WOS:000328588700016
公开日期	2015-05-27
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/13572]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.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
推荐引用方式 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.