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采用热重法在1173～1373 K、全CO气氛条件下,对首钢烧结矿进行还原动力学实验,确定了还原反应的表观活化能,进而推断在还原反应的前期烧结矿还原速率均由界面反应控制,还原反应后期的控制环节为固相扩散.分别由未反应核模型和固相反应动力学模型,分段给出不同温度下控制环节突变的时间点;通过动力学公式计算,得出不同温度下的反应速率常数和固相扩散系数.利用光学显微镜观察了烧结矿在各还原阶段的微观形貌,验证了烧结矿还原动力学的机理,同时也证明了扩散控制阶段使用体积缩小的未反应核模型与实际情况是吻合的.
The thermal kinetics of Shougang sinter was investigated by thermogravimetric method at 1173 ~ 1373 K and full CO atmosphere. The apparent activation energy of the reduction reaction was determined, and the reduction rate of sinter in the early stage of the reduction reaction was deduced from the interface Reaction control and the control phase of the reduction reaction is the solid phase diffusion.Under the unreacted nuclear model and the solid state reaction kinetic model respectively, the time point of the mutation of the control link at different temperatures is given in sections. By the calculation of the dynamic formula, The reaction rate constant and the solid-phase diffusion coefficient at different temperatures.The microstructure of the sinter was observed by optical microscopy and the reduction kinetics of the sinter was verified. At the same time, it was also proved that the volumetric reduction Unreacted nuclear model is consistent with the actual situation.