【摘要】 在升温速率为5K/min～30K/min的范围内利用热分析(TGA)技术对平均粒径为13.4μm的CaCO3进行了煅烧分解的实验研究.分别应用Friedman法、Vyazovkin法、改进的Coats-Redfern法和Flynn-Wall-Ozawa(FWO)法等4种不同的等转化率法计算了CaCO3的分解动力学参数,得到的活化能范围为170.86kJ/mol～230.87kJ/mol.比较了不同方法得到的结果以及它们的差别.对CaCO3在分解过程中活化能随反应进程而变化这一现象,从实验过程、数学假定以及推导等方面进行了分析.更多还原

【Abstract】 The experimental research of CaCO₃ decomposition is completed in thermo-gravimetsic analyzer.The heating rate is 5 K/min～30 K/min,and the mean particlesize of the sample that is measured by Malvern Laser Master Size Analyzer is 13.4 μm.Four equal conversion rate methods,which are Friedman method,Vyazovkin method,modified Coats-Redfern method and Flynn-Wall-Ozawa（FWO）method,are employed to calculate the kinetics parameters of CaCO₃ decomposition.The active energy is in the range of 170.86 kJ/mol～230.87 kJ/mol,and varies with conversion fraction during CaCO₃ decomposition.The reasons why the active energy varies with conversion fraction are explained from the views of experiment method,mathematics assumptions and deduce of calculated formulas used in various methods.更多还原