Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions

doi:10.1007/s11144-019-01565-1

	Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions
	Jiang, Xiaoduo 1,2,3; Zhang, Yifei 1,2; Zhang, Yi 1,2
刊名	REACTION KINETICS MECHANISMS AND CATALYSIS
	2019-06-01
卷号	127 期号:1 页码:489-504
关键词	Sodalite Highly caustic solution Desilication Kinetics
ISSN号	1878-5190
DOI	10.1007/s11144-019-01565-1
英文摘要	Desilication in the solution with Na2O concentration below 300g/L was extensively studied, such as various desilication agents mostly of calcium salts or compounds proposed in the literature. However, desilication in high-alkali sodium aluminate solution was necessary in the production of sodium aluminate hydrate (SAH), but much difficult as the high silicate solubility in concentrated caustic solution. Therefore, an effective desilication method was investigated with different mechanism in this paper. The hydroxy-sodalite compound was synthesized and found with excellent desilication properties in highly caustic aluminate solution until 470-530g/L Na2O, and the desilication mechanism in concentrated sodium aluminate solution was presented firstly. The crystallization reaction of silicate with aluminate in the sodium aluminate solution during the desilication was proposed. It was observed that the aluminate concentration in the concentrated solution considerably affected the desilication. Furthermore, the kinetics equation was inferred as -d sigma/dt=exp(29.30-11311/T) (sigma)(n), with the obtained apparent activation energy and order dependence of 94.04kJ/mol and 2.47 +/- 0.47. Meanwhile, the equilibrium SiO2 concentrations of the synthesized hydroxy-sodalites in the sodium aluminate solutions with 470-530g/L Na2O at 353-393K were determined.
资助项目	National High Technology Research and Development Program of China (863 Program)[2011AA060701]
WOS关键词	RED MUD ; SOLUBILITY ; ALUMINOSILICATES ; CRYSTALLIZATION
WOS研究方向	Chemistry
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000468213500034
资助机构	National High Technology Research and Development Program of China (863 Program)
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/28176]
专题	中国科学院过程工程研究所
通讯作者	Zhang, Yifei
作者单位	1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Xiaoduo,Zhang, Yifei,Zhang, Yi. Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions[J]. REACTION KINETICS MECHANISMS AND CATALYSIS,2019,127(1):489-504.
APA	Jiang, Xiaoduo,Zhang, Yifei,&Zhang, Yi.(2019).Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions.REACTION KINETICS MECHANISMS AND CATALYSIS,127(1),489-504.
MLA	Jiang, Xiaoduo,et al."Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions".REACTION KINETICS MECHANISMS AND CATALYSIS 127.1(2019):489-504.