Improved precipitation of gibbsite from sodium aluminate solution by adding methanol

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	Improved precipitation of gibbsite from sodium aluminate solution by adding methanol
	Zhang, Ying 1,2; Zheng, Shili 1; Du, Hao 1; Xu, Hongbin 1; Wang, Shaona 1; Zhang, Yi 1
刊名	HYDROMETALLURGY
	2009-08-01
卷号	98 期号:1-2 页码:38-44
关键词	Sodium aluminate Gibbsite Methanol Crystallisation Bayer liquor
ISSN号	0304-386X
通讯作者	Zheng, SL
英文摘要	A 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.
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]	CRYSTALLIZATION ; SULFATE
收录类别	SCI
语种	英语
WOS记录号	WOS:000267932100005
公开日期	2013-12-06
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/6618]
专题	过程工程研究所_湿法冶金清洁生产技术国家工程实验室
作者单位	1.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
推荐引用方式 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,&Zhang, Yi.(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.