文献类型：会议论文

英文题名：Preparation of anhydrous magnesium chloride from bischofite (MgCl₂?6H₂O) I.: Reaction crystallization of magnesium chloride hexammoniate

作者：Wang, XT; Zhao, JH; Song, XF; Wang, J; Yu, JG

机构：[1]E China Univ Sci & Technol, LRUE, Shanghai 200237, Peoples R China

会议论文集：International Conference on Magnesium - Science, Technology and Applications

会议日期：SEP 20-24, 2004

会议地点：Beijing, PEOPLES R CHINA

语种：英文

外文关键词：magnesium chloride hexammoniate; reaction crystallization; crystal size distribution

摘要：Magnesium chloride hexammoniate (MgCl2 center dot 6NH(3)) is an intermediate product for preparation anhydrous magnesium chloride by reaction crystallization method. An experiment study of a semi-batch reaction crystallization is presented. In a single feed operation, magnesium chloride solution is fed to a stirred methanol solution mixed with ammonia to crystallize magnesium chloride hexammoniate. The median crystal size of product increases with increasing stirring rate, reaches a maximum, and then decreases again. Decreasing feed rate or decreasing stirring time increases the crystal size significantly. The reaction temperature and concentration of magnesium ion can also influence the crystal size distribution (CSD). A double feed operation can create larger crystal size than that of single feed operation. The relationship between crystal size and the content of water of the product is discussed.