利用非等温动力学进行铁酸镁生成机理研究

以轻烧镁粉和化学纯Fe2O3为原料,采用热分析方法,在静态空气的条件下,分别以10,15,20 K/min的升温速率,对铁酸镁生成的动力学进行了DSC实验研究。利用Kissinger法、Ozawa法和Achar-Brindley-Sharp-Wend-worth法确定了动力学特征参数,机理函数、活化能等。由结果可知:在1 500—1 650 K温度区间内铁酸镁的生成反应明显发生,铁酸镁生成反应的活化能为626.83—652.60 kJ/mol,铁酸镁的生成机理符合随机形核、快速生长模型。

Research on synthesis mechanism of magnesium ferrite by non-isothermal kinetics

The synthesis process of magnesium ferrite was studied by thermal analysis method.The DSC experiment of the synthesis reaction of magnesium ferrite was made with active magnesia and chemical reagent Fe2O3 in static air atmosphere at different temperature rise as 10,15 and 20 K/min.The kinetics parameters,the mechanism function and the activation energy of the synthesis reaction of magnesium ferrite were calculated by Kissinger equation,Ozawa equation and Achar-Brindley-Sharp-Wendworth equation.The DSC curves of the mixture of active magnesia and chemical reagent Fe2O3 show that the formation of magnesium ferrite is evident from 1 500 K to 1 650 K,the activation energy of the reaction is 626.83-652.60 kJ/mol,and the function of the reaction mechanism of magnesium ferrite is fit for the model of nucleation forming and growing at random.