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Alumina Hydrate Polymorphism Control in Al-Water Reaction Crystallization by Seeding to Change the Metastable Zone Width
Wang, Hongqi1,2; Wang, Zhi1; Liu, Ling1,2; Gong, Xuzhong1; Wang, Mingyong1
2016-02-01
Source PublicationCRYSTAL GROWTH & DESIGN
ISSN1528-7483
Volume16Issue:2Pages:1056-1062
Abstract

The polymorph of alumina hydrate from Al-H2O reaction crystallization is hard to control due to its complexity. In this study, seeding is adopted to control the polymorphism by changing the metastable zone width (MSZW) which provides the easiest way to quantify the system stability. First, the influence of seed amount on the MSZW and polymorph was investigated. The MSZW declines with the increase of seed loading, and the critical seed loading for obtaining single gibbsite phase products is determined to be 15 g/L. Then the effect of seeding time on the polymorph indicates that the seed should be added before nucleation occurrence in order to control polymorphism effectively. The MSZW and polymorph of both seed-free and seeded Al-H2O reaction crystallization is controlled by changing the temperature and alkali concentration. It is found that if the critical concentration is lower than the saturation solubility curve of bayerite in the diagram, single gibbsite phase crystals can be obtained. Besides, the mechanism for polymorph control by changing the MSZW mainly includes the epitaxial growth and secondary nucleation which dominates the process under 90 and 60 degrees C, respectively.

KeywordAb-initio Gibbsite Bayerite Nucleation Stability Hydroxide Solvent
SubtypeArticle
Subject AreaChemistry, Multidisciplinary ; Crystallography ; Materials Science, Multidisciplinary ; Chemistry ; Crystallography ; Materials Science
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1021/acs.cgd.5b01620
URL查看原文
Indexed BySCI
Language英语
WOS KeywordAb-initio ; Gibbsite ; Bayerite ; Nucleation ; Stability ; Hydroxide ; Solvent
WOS Research AreaChemistry ; Crystallography ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Crystallography ; Materials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China(51422405 ; 51374192)
WOS IDWOS:000369773300060
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/20668
Collection研究所(批量导入)
Corresponding AuthorWang, Zhi
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Hongqi,Wang, Zhi,Liu, Ling,et al. Alumina Hydrate Polymorphism Control in Al-Water Reaction Crystallization by Seeding to Change the Metastable Zone Width[J]. CRYSTAL GROWTH & DESIGN,2016,16(2):1056-1062.
APA Wang, Hongqi,Wang, Zhi,Liu, Ling,Gong, Xuzhong,&Wang, Mingyong.(2016).Alumina Hydrate Polymorphism Control in Al-Water Reaction Crystallization by Seeding to Change the Metastable Zone Width.CRYSTAL GROWTH & DESIGN,16(2),1056-1062.
MLA Wang, Hongqi,et al."Alumina Hydrate Polymorphism Control in Al-Water Reaction Crystallization by Seeding to Change the Metastable Zone Width".CRYSTAL GROWTH & DESIGN 16.2(2016):1056-1062.
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