The mixing effect of powder materials is crucial in the iron ore granulation process, which determines the composition and particle size distribution, thereby affecting the quality of the sinter. To study the mixing effect of powder particles in a high speed shear mixer (HSSM) and cylinder mixer (CM), numerical simulation based on discrete element method was adopted in this work. For the CM, the particle movement consists of slipping and slumping. For the HSSM, the particle movement consists of rolling and cascading. The particle movement intensity coefficient of the HSSM is larger than that of CM, indicating that the movement of the particles in HSSM is more intensive. For HSSM case with four blades, the variation coefficient of homogeneity increases as rotational speed increases. The number of blades has little effect on the particle movement intensity coefficient and variation coefficient of homogeneity. In comparison to the CM, the variation coefficient of the HSSM reduce the most. It means that the mixing effect of HSSM is better than the CM. These findings are helpful for the improvement of the mixing and granulation efficiency in the iron ore sintering process.

粉料的混合效果在铁矿石造粒过程中至关重要，它决定了组成和粒度分布，进而影响烧结矿的质量。为了研究粉末颗粒在高速剪切混合机（HSSM）和圆筒混合机（CM）中的混合效果，本文采用基于离散元方法的数值模拟。对于 CM，粒子运动包括滑动和坍塌。对于 HSSM，粒子运动包括滚动和级联。HSSM 的粒子运动强度系数大于 CM，说明 HSSM 中粒子的运动更加强烈。对于四叶片的 HSSM 情况，均匀性的变异系数随着转速的增加而增加。叶片数量对粒子运动强度系数和均匀性变异系数影响不大。与CM相比，HSSM的变异系数降低得最多。这意味着HSSM的混合效果优于CM。这些发现有助于提高铁矿石烧结过程中的混合和造粒效率。