文献类型：期刊文献

中文题名：MgCl_2·6H_2O热分解机理的研究

英文题名：Thermal Decomposition Mechanism of MgCl_2·6H_2O

作者：黄琼珠[1];路贵民[1];汪瑾[1];于建国[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2010

卷号：25

期号：3

起止页码：306

中文期刊名：无机材料学报

外文期刊名：Journal of Inorganic Materials

收录：CSTPCD;;EI(收录号：20101912923025);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家重点实验室开放基金课题

语种：中文

中文关键词：MgCl2.6H2O;Mg(OH)Cl.0.3H2O;脱水;水解;热分解

外文关键词：MgCl2·6H2O; Mg（OH）Cl·0.3H2O; dehydration; hydrolysis; thermal decomposition

摘要：利用综合热分析仪、电阻炉煅烧、X射线衍射、扫描电镜、能谱分析和化学分析,研究了MgCl2.6H2O的热分解机理及中间产物形貌.研究发现:MgCl2.6H2O热分解过程分为六步,在69℃时生成MgCl2.4H2O,129℃时生成MgCl2.2H2O,167℃时生成MgCl2.nH2O(1≤n≤2)和MgOHCl,203℃时MgCl2.nH2O(1≤n≤2)水解与脱水同时进行生成Mg(OH)Cl.0.3H2O,235℃时Mg(OH)Cl.0.3H2O脱水转变为MgOHCl,415℃时MgOHCl直接分解生成MgO.MgOHCl颗粒形状不规则,为多孔结构,Mg(OH)Cl.0.3HO颗粒表面平整.
The thermal decomposition mechanism and the intermediate morphology of MgCl2·6H2O before and after calcination by a resistance furnace,were studied using integrated thermal analysis,X-ray diffraction,scanning electron microscope,energy dispersive X-ray spectrum and chemical analysis.The results showed that there were six steps in the thermal decomposition of MgCl2·6H2O,producing MgCl2·4H2O at 69℃,MgCl2·2H2O at 129℃,MgCl2·nH2O（1≤n≤2） and MgOHCl at 167℃,and the MgCl2·nH2O（1≤n≤2） converted to Mg（OH）Cl·0.3H2O with dehydration and hydrolysis simultaneously at 203℃,Mg（OH）Cl·0.3H2O dehydrated to MgOHCl at 235℃,MgOHCl directly converted to MgO at 415℃.The MgOHCl particle was irregular with porous structure,while Mg（OH）Cl·0.3H2O particle had relatively flat surface.