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磷石膏与纯石膏脱水反应的动力学对比研究

Physical Testing and Chemical Analysis Part B:Chemical Analysis(2015)

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Abstract
对磷石膏与纯石膏脱水反应的动力学对比进行了研究.利用同步热分析仪分别测试了磷石膏和纯石膏的脱水过程,采用热重数据计算动力学参数.结果表明:磷石膏和纯石膏脱水都分为两步进行,第一步生成半水石膏,第二步生成无水石膏;两步脱水反应都符合Avrami-Erofeev方程,反应速率受晶核形成和生长速率控制;磷石膏两步脱水活化能分别为97.67,92.6 3 kJ·mol-1,纯石膏对应的活化能是94.56,79.05 kJ·mol-1.
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