CAS OpenIR  > 湿法冶金清洁生产技术国家工程实验室
Improved precipitation of gibbsite from sodium aluminate solution by adding methanol
Zhang, Ying1,2; Zheng, Shili1; Du, Hao1; Xu, Hongbin1; Wang, Shaona1; Zhang, Yi1; Zheng, SL
2009-08-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume98Issue:1-2Pages:38-44
AbstractA new method is explored to improve the precipitation of gibbsite from sodium aluminate solution by adding methanol to the pregnant liquor. The stability of sodium aluminate solution decreases in the presence of methanol, leading to faster crystallisation than the normal seeded precipitation process. The effects of methanol amount, caustic concentration. reaction time and temperature, stirring and feeding mode are systematically investigated. Considering possible industrial application, the optimum conditions are 1:1 volume ratio of methanol to sodium aluminate solution, similar to 170 g/L Na(2)O and 1.55:1 caustic to aluminate ratio at 60 degrees C. The feeding mode and feeding rate have no significant effect on the final yield when moderately stirred. Under these conditions, 70% precipitation can be reached within 24 h, which is about 20% higher than the Bayer seeded precipitation practice of at least 56 h. Characterization of the crystals using XRD, SEK and PSD shows a typical gibbsite phase composed of super-thin sheets with an average diameter of similar to 90 mu m. IR and Raman spectra analyses suggest that added methanol captures water molecules from the aluminate ion hydration sphere thus catalyzing the crystallisation process. (C) 2009 Elsevier B.V. All rights reserved.
KeywordSodium Aluminate Gibbsite Methanol Crystallisation Bayer Liquor
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2009.03.014
Indexed BySCI
Language英语
WOS KeywordCRYSTALLIZATION ; SULFATE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000267932100005
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6618
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorZheng, SL
Affiliation1.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Ying,Zheng, Shili,Du, Hao,et al. Improved precipitation of gibbsite from sodium aluminate solution by adding methanol[J]. HYDROMETALLURGY,2009,98(1-2):38-44.
APA Zhang, Ying.,Zheng, Shili.,Du, Hao.,Xu, Hongbin.,Wang, Shaona.,...&Zheng, SL.(2009).Improved precipitation of gibbsite from sodium aluminate solution by adding methanol.HYDROMETALLURGY,98(1-2),38-44.
MLA Zhang, Ying,et al."Improved precipitation of gibbsite from sodium aluminate solution by adding methanol".HYDROMETALLURGY 98.1-2(2009):38-44.
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