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2010 , Vol. 25 >Issue 3: 306 - 310

DOI: https://doi.org/10.3724/SP.J.1077.2010.00306

研究论文

MgCl2·6H2O热分解机理的研究

  • 黄琼珠 ,
  • 路贵民 ,
  • 汪 瑾 ,
  • 于建国
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  • 华东理工大学 化学工程联合国家重点实验室, 上海 200237

收稿日期: 2009-07-10

  修回日期: 2009-08-30

  网络出版日期: 2010-03-20

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Thermal Decomposition Mechanism of MgCl 2·6H2O

  • HUANG Qiong-Zhu ,
  • LU Gui-Min ,
  • WANG Jin ,
  • YU Jian-Guo
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  • StateKey Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received date: 2009-07-10

  Revised date: 2009-08-30

  Online published: 2010-03-20

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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·0.3H2O颗粒表面平整.

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

本文引用格式

黄琼珠 , 路贵民 , 汪 瑾 , 于建国 . MgCl2·6H2O热分解机理的研究[J]. 无机材料学报, 2010 , 25(3) : 306 -310 . DOI: 10.3724/SP.J.1077.2010.00306

Abstract

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.

Key words： MgCl2·6H2O; Mg(OH)Cl·0.3H2O; dehydration; hydrolysis; thermal decomposition

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