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KINETICS OF BOEHMITE PRECIPITATION FROM SUPERSATURATED SODIUM ALUMINATE SOLUTIONS WITH ETHANOL-WATER SOLVENT
Wang, Z.; Xu, R. G.; Yang, L.; Guo, Z. C.
2012
Conference NameSymposium on Light Metals / TMS Annual Meeting and Exhibition
Source PublicationLight Metals 2012
Pages119-124
Conference DateMAR 11-15, 2012
Conference PlaceOrlando, FL
AbstractBoehmite was prepared from supersaturated sodium aluminates solutions with ethanol-water solvent. The results of thermogravimetric analyzer and XRD showed that the product was mixture of boehmite and gibbsite, and the mass ratio of gibbiste and boehmite varied greatly with different process conditions. This work presents the effects of mass ratio of ethanol and temperature on the precipitation rate and phase compositions of alumina hydrate. The ratio of AlOOH in the product increased significantly with the increase of mass ratio of ethanol because the precipitation of gibbsite was restrained. When the solvent was pure ethanol, the ratio of AlOOH in the product reaches the peak of 90%. Ethanol reduces the free caustic concentration and increases initial supersaturation coefficient significantly. The boehmite activation energy of precipitation in ethanol solvent was 13.7 kJ/mol, indicated that ethanol reduces effectively energy barrier of boehmite from sodium aluminate solutions and it was controlled by diffusion process.
KeywordSodium Aluminate Solution Ethanol-water Solvent Precipitation Boehmite Gibbsite Gibbsite Crystallization Inhibition Agglomeration
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Indexed ByCPCI
Language英语
Document Type会议论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11246
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Wang, Z.,Xu, R. G.,Yang, L.,et al. KINETICS OF BOEHMITE PRECIPITATION FROM SUPERSATURATED SODIUM ALUMINATE SOLUTIONS WITH ETHANOL-WATER SOLVENT[C],2012:119-124.
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