本文实验观察了多孔铁矿石球团的还原行为。采用等温未反应收缩核模型的混合控制方程处理不同孔隙度球团的逐段还原试验结果,得出了反应速度常数和有效扩散系数与孔隙度的函数关系。由此,推测出还原气体扩散通过球团的机理。针对高孔隙度球团还原所具有的区域反应特征,本文建立了多级区域反应模型,说明了考虑固相结构变化的重要性。 In this paper, we observed the reduction behavior of porous iron ore pellets. By using the mixed governing equations of isothermal unreacted core model, the results of the section-by-section reduction of pellets with different porosity were obtained. The relationship between the reaction rate constant and the effective diffusion coefficient and the porosity was obtained. From this, it is estimated that the reducing gas diffuses through the pellet. Aiming at the regional reaction characteristics of high porosity pellet reduction, a multi-level regional reaction model is established in this paper, which shows the importance of considering the change of solid phase structure.