文献类型：期刊文献

英文题名：Effects of Methanol on the Seeded Precipitation of Al(OH)3 from Potassium Aluminate Solution

作者：Luo, Mengjie[1];Sun, Yuzhu[1];Liu, Chenglin[1];Xue, Jin[1];Song, Xingfu[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Minist Educ, Engn Res Ctr Resource Salt Lake Proc Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：58

期号：1

外文期刊名：CRYSTAL RESEARCH AND TECHNOLOGY

收录：;EI(收录号：20224312997498);WOS:【SCI-EXPANDED(收录号:WOS:000870554900001)】；

基金：The authors wish to acknowledge the National Natural Science Foundation of China (Grant 21908064) for the financial support.

语种：英文

外文关键词：Al(OH)(3) crystallization; crystal morphology; methanol; potassium aluminate; seeded precipitation

摘要：The effects of methanol on the seeded precipitation of Al(OH)(3) from potassium aluminate solution are investigated. The solubility of Al(OH)(3) decreases in the presence of methanol, leading to a faster crystallization and a higher precipitation ratio than the normal seeded precipitation process. Under the optional precipitation conditions of temperature 323.15 K, K2O concentration 170 g L-1, and addition of an equal volume of methanol to potassium aluminate solution, the precipitation ratio can exceed 85% within 7 h. Characterization of the Al(OH)(3) products using X-ray diffraction, scanning electron microscopy, and particle size distribution shows a typical gibbsite crystal phase composed of sheet-like agglomerates with an average particle size of 74 mu m. An interaction model between methanol molecules and Al(OH)(3) crystal face is established and calculated by using the molecular dynamics method, which indicates the morphology transition mechanism of the Al(OH)(3) crystal. The result indicates that methanol molecules would hinder the growth of the (002) crystal face, so that the (002) crystal face is eventually retained and becomes the main crystal face for the Al(OH)(3) product. Infrared radiation and Raman spectra analyses suggest that the added methanol captures water molecules from the aluminate ion hydration sphere and thus catalyzes the crystallization process.