杨秀山,邓少刚,黄鹏辉,王辛龙,杨林,张志业,钟本和

• 1:四川大学化学工程学院

摘要(Abstract)：

磷石膏是湿法磷酸的副产物。化学法分解磷石膏制硫酸技术被认为是解决磷石膏巨量堆积严重污染环境问题的有效途径之一。但几乎所有化学分解磷石膏制备硫酸和氧化钙的工艺都不可避免地存在中间分解产物硫化钙与磷石膏的固固反应,研究该反应机理对化学法分解磷石膏的应用具有重要指导意义。今对硫化钙磷石膏固固反应过程进行了热分析动力学研究,考察了反应机理。结果表明该反应的表观活化能E为159.0 k J×mol~(-1),指前因子A为186727,最概然机理函数为G(α)=-ln(1-α),f(α)=1-α,反应机理为晶体成核与生长控制过程,描述硫化钙磷石膏固固反应过程的动力学方程为dα/dt=1.87×10~5exp(-1.91×104/T)(1-α)。

关键词(KeyWords)： 磷石膏;热分析动力学;固固反应;硫化钙

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(2011AA06A106);; 四川大学青年教师科研启动基金(2014SCU11020)

作者(Author): 杨秀山,邓少刚,黄鹏辉,王辛龙,杨林,张志业,钟本和

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