六氨氯化镁初级成核研究  

Primary nucleation of magnesium chloride hexammoniate

作　　者：赵建海[1] 汪瑾[1] 宋兴福[1] 于建国[1] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237

出　　处：《化工学报》2005年第2期281-284,共4页CIESC Journal

摘　　要：Production of anhydrous magnesium chloride by dehydra ti on of bischofite is one of the best ways to utilize the magnesium resource of sa lt lakes. Formation of magnesium chloride hexammoniate (MgCl 2·6NH 3) is the critical step of the coupled reaction crystallization process, which is an att ractive dehydration process. Primary nucleation of MgCl 2·6NH 3 by reaction crystallization process was performed in this research. The induction period of MgCl 2·6NH 3 primary nucleation was measured by the laser method, and classi cal theory of primary nucleation was used to quantify the nucleation process. W hen supersaturation ratio (S=C/C*)S>2,homogeneous nucleation occurred; when S<2,heterogeneous nucleation occurred.The relationships among critical free energy of nucleation,critical size of nucleus and supersaturation was obta ined.Critical free energy and critical size of nucleus decreased with increasing supersaturation.Production of anhydrous magnesium chloride by dehydration of bischofite is one of the best ways to utilize the magnesium resource of salt lakes. Formation of magnesium chloride hexammoniate (MgCl2&middot 6NH3) is the critical step of the coupled reaction crystallization process, which is an attractive dehydration process. Primary nucleation of MgCl2&middot6NH3 by reaction crystallization process was performed. The induction period of MgCl2&middot6NH3 primary nucleation was measured by the laser method, and classical theory of primary nucleation was used to quantify the nucleation process. When supersaturation ratio (S = C/C*) S > 2, homogeneous nucleation occurred; when S < 2, heterogeneous nucleation occurred. The relationships among critical free energy of nucleation, critical size of nucleus and supersaturation was obtained. Critical free energy and critical size of nucleus decreased with increasing supersaturation.

关 键 词：六氨氯化镁 初级成核 反应结晶 诱导期 

分 类 号：TQ026.5[化学工程]