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采用综合热分析仪在动态空气气氛条件下研究了高岭土的热分解过程,利用热重分析数据对高岭土的热分解过程进行了动力学分析。用迭代的等转化率方法获取了准确的活化能,将得到的活化能应用到Malek方法中推测其反应机理,并进一步求得了指前因子A。结果发现:高岭土在400～700℃脱去羟基过程遵循化学反应的模型,其微分和积分表达式分别为:f(α)=(1-α)n,G(α)=1-(1-α)1-n/1-n(其中:α为转化率,反应级数n=2.1,表观活化能为182.428kJ/mol),指前因子A的范围为:(4.566～4.635)×1011s-1。
The thermal decomposition process of kaolin was studied by dynamic thermal analysis in a dynamic air atmosphere. The thermal decomposition of kaolin was analyzed by thermogravimetric analysis. The exact activation energy was obtained by the iteration method of equal conversion. The activation energy obtained was applied to the Malek method to infer the reaction mechanism, and the pre-exponential factor A was further obtained. The results show that the process of kaolinite removal at 400 ~ 700 ℃ follows the chemical reaction model. The differential and integral expressions of kaolinite are as follows: f (α) = (1-α) n, G (α) = 1- α) 1-n / 1-n (where α is the conversion rate, the reaction order is n = 2.1 and the apparent activation energy is 182.428 kJ / mol). The range of pre-exponential factor A is (4.566-4.635) × 1011s -1.