高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (10): 1555.

• 论文 • 上一篇    下一篇

超细碳酸钙微晶结构与热分解特性

岳林海1, 水淼1, 徐铸德1, 吕德义2   

  1. 1. 浙江大学化学系, 杭州 310027;
    2. 浙江工业大学化工学院, 杭州 310014
  • 收稿日期:1999-06-16 出版日期:2000-10-24 发布日期:2000-10-24
  • 通讯作者: 徐铸德(1944年出生),男,教授,博士生导师,从事物理化学研究.

The Crystal Structure of Ultra-fine CaCO3 and Its Thermal Decomposition

YUE Lin-Hai1, SHUI Miao1, XU Zhu-De1, LU De-Yi2   

  1. 1. Departmentof Chemistry, Zhejiang University, Hangzhou, 310027, China;
    2. College of Chemistry and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • Received:1999-06-16 Online:2000-10-24 Published:2000-10-24

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被引次数

64

摘要： 研究了不同晶粒粒径,不同团聚状态的3种超细碳酸钙样品的热分解状况.应用三维球对称相界面迁移机理和CoatsandRedfern方程与应用Kissinger非机理方程得到的动力学参数基本一致,与普通碳酸钙相比,超细碳酸钙显示出60～80kJ·mol-1的表观活化能降.3种超细碳酸钙样品的X射线衍射的数据分析表明,超细碳酸钙样品晶格中存在较大的畸变应力.我们认为,这可能是导致其反常热分解特性的原因.同时,对样品的TEM,SEM的观察揭示了微结构的团聚状态对热分解活化能的影响.

关键词: 超细碳酸钙, 非等温热分解动力学, 晶格畸变

Abstract: The thermal decomposition of three ultra-fine CaC03 having different particle sizes and agglom-eration states was investigated.The kinetic parameters obtained by using the contracting volume mecha-nism R3 and Coats and Redfern's equation were in good agreement with those using Kissinger non-mecha-nism equation. Furthermore，the result showed that a considerable diminution of the activation energy Ea up to 60~80 kJ·mol-1 is observed in the case of ultra-fine calcite. The Voigt analysis of the X-ray diffrac-tion data for the samples showed that abnormally large strain existed in the lattice of these samples. We suggest that this may be the reason of their abnormal decomposition behavior. At the same time，we ob-served that the conglomeration states revealed by TEM and SEM images result in the minute difference be-tween those ultra-fine CaCO3.

Key words: Ultra-fine CaCO3, Non-isothermal decomposition kinetics, Lattice distortion

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