CaO-超细高岭土复合固硫剂固硫动力学研究

Sulfur fixing and kinetics of CaO-kaolin complex reagent

利用高岭土的加工产品超细高岭土,制备了CaO 超细高岭土复合固硫剂,用热分析法研究其固硫性能和特征,并用等效粒子模型对该固硫剂固硫反应的动力学过程进行模拟和计算,得到了固硫反应的动力学参数。研究表明,CaO 超细高岭土复合固硫剂有着较好的固硫率,特别是高于1000℃时在固硫反应后期的产物层扩散控制阶段呈现很好的固硫率增长,1009℃下固硫率较CaO提高达26%。

Kaolin is a low-cost and abundant resource in nature. Its product, superfine kaolin, was used as additive to prepare CaO-kaolin complex sulfur fixing reagent. The sulfur fixing efficiency of CaO-kaolin is studied by thermogravimetric technique. The results are compared to that of CaO. The conversion of CaO in CaO-kaolin is improved much more than that of pure CaO by 26% when reacting at 100?9?℃. The grain model of reaction kinetics is used to describe the sulfur fixing process of CaO-kaolin. Because of increasing synchronously, the kinetic data of activation energy E_a and the gene k_0 can't reflect the activity of sulfur fixing reaction. Reaction velocity k, diffusion coefficient D_S of CaO and CaO-kaolin at different temperatures show that CaO-kaolin has better reaction performance because kaolin greatly improves the diffusion coefficient D_S.