文献类型：期刊文献

英文题名：Effects of Al2(SO4)3 and K2SiO3 Impurities on the Crystallization of K2SO4 from Aqueous Solution

作者：Luo, Mengjie[1];Liu, Chenglin[1];Song, Xingfu[1];Yu, Jianguo[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：2021

卷号：56

期号：1

外文期刊名：CRYSTAL RESEARCH AND TECHNOLOGY

收录：;EI(收录号：20204909577966);WOS:【SCI-EXPANDED(收录号:WOS:000585643800001)】；

基金：The authors wish to acknowledge National Nature Science Foundation of China (Grant 21908064), China Postdoctoral Science Foundation (Grant 2018M641940), and Program of Shanghai Academic/Technology Research Leader (Grant 18XD1424600) for the financial support.

语种：英文

外文关键词：crystal morphology; crystallization from solution; impurities; K2SO4; metastable zone width

摘要：The results of an investigation of the effect of Al-2(SO4)(3) and K2SiO3 impurities on the crystallization of K2SO4 from aqueous solutions are described and discussed. The metastable zone width (MSZW) of K2SO4 aqueous solutions, without and with known concentrations of the impurities, saturated at 40 and 60 degrees C is determined, using ultrasonic sensor by the controlled solution cooling method at predefined cooling rates R. It is observed that the value of the MSZW of the two types of saturated solutions increases with an increase in the cooling rate R and the concentration C-i of the two impurities. The experimental data of the dependence of MSZW on cooling rate and impurity concentration are analyzed by an approach based on the classical 3D nucleation theory. The results showed that: 1) both impurities suppress the formation of 3D nuclei by physically blocking the active sites on their surfaces, 2) Al-2(SO4)(3) impurity is more effective than K2SiO3 impurity, and 3) the purity of the K2SO4 crystals is insignificantly affected by these impurities, but the morphology and size of the obtained crystals are influenced strongly by Al-2(SO4)(3) impurity.