纳米级粒径超细碳酸钙热分解动力学

DECOMPOSITION KINETICS OF NANO PARTICLE CALCITE

研究了纳米级粒径超细碳酸钙的热分解动力学。采用标准作图法和ＣｏａｔｓａｎｄＲｅｄｆｅｒｎ方程对非等温动态实验数据分析结果表明符合三维球对称相界面迁移机理并综合了几种方法求解动力学参数。与普通碳酸钙相比，超细碳酸钙有７０～８０ｋＪ·ｍｏｌ－１的表观活化能降。

The decomposition kinetics of nano particle calcite is investigated using the master plot method and Coats and Redfern′s equation. It is shown that the nano particle calcite as well as the reference calcite dissociates according to three dimensional phase boundary movement mechanism R 3. Combined techniques are used to determine the kinetic parameters. A considerable diminution in activation energy E a up to 70￣80 kJ·mol -1 is observed.