粉煤直接熔融还原高磷铁矿的非等温分布动力学

Non-isothermal kinetics model for direct reduction of phosphorus iron ore by powdered coal

针对单一计算几个活化能无法准确揭示还原过程全貌的问题,采用非等温热分析方法对粉煤直接熔融还原高磷铁矿的过程规律进行了研究,利用多重扫描法结合Starink方法对还原过程的动力学参数(表观活化能,频率因子)进行了改进计算,提出一种表观活化能的分布函数及频率因子的分布动力学模型及方法;该模型分别从活化分子和碰撞理论角度有效地揭示出高磷铁矿直接熔融还原过程的能量转化机理及阶段特征,为云南省高磷铁矿的进一步开发提供参考以及其他矿产资源的开发在理论研究上提供方法借鉴。

Because several activation energy data could not accurately reveal the reduction process, the non-isothermal experiments for direct smelting reduction of the high-phosphorus iron ore were carried out. The multiple scanning methods and Starink method were employed to calculate kinetic parameters in reduction process（the apparent activation energy, frequency factor）, and then the distribution kinetic models of the apparent activation energy and the frequency factor were established. The energy conversion mechanism of iron ore smelting reduction and phase characteristics were revealed from the activation molecular and collision theory effectively by the model. The results would be useful to the further development of high phosphorus iron ore in Yunnan Province, and the method could be used to development of other mineral resources in theoretical research.Key words： high phosphorus iron ore; smelting reduction; apparent activation energy; pre-exponential factor; distribution