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Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions
Jiang, Xiaoduo1,2,3; Zhang, Yifei1,2; Zhang, Yi1,2
2019-06-01
Source PublicationREACTION KINETICS MECHANISMS AND CATALYSIS
ISSN1878-5190
Volume127Issue:1Pages:489-504
AbstractDesilication 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.
KeywordSodalite Highly caustic solution Desilication Kinetics
DOI10.1007/s11144-019-01565-1
Language英语
WOS KeywordRED MUD ; SOLUBILITY ; ALUMINOSILICATES ; CRYSTALLIZATION
Funding ProjectNational High Technology Research and Development Program of China (863 Program)[2011AA060701]
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
Funding OrganizationNational High Technology Research and Development Program of China (863 Program)
WOS IDWOS:000468213500034
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/28176
Collection中国科学院过程工程研究所
Corresponding AuthorZhang, Yifei
Affiliation1.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
Recommended Citation
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.
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