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本文以空气动力学及气-固两相流的基本原理为基础,分析分级过程中气体及颗粒的运动规律，建立了分级叶轮内部速度流场模型，并推导出分级粒径公式，以作为超细粉分过的理论依据。为验证分级粒任公式的精确度，以云母、碳化硅、碳酸钙和氧化铝为原料，在流化床式气流粉碎机上进行了粉碎和分级实验，研究了分级叶轮结构对分级性能的影响。最后，进行了分级叶轮的优化设计。
Based on the basic principles of aerodynamics and gas-solid two-phase flow, this paper analyzes the gas and particle movement during classification and establishes the model of velocity and flow field inside the graded impeller, and derives the formula of graded particle size, The theory of fine powder divided. In order to verify the accuracy of grading granularity formula, the pulverization and grading experiments were carried out on a fluidized bed jet mill with mica, silicon carbide, calcium carbonate and alumina as raw materials, and the effect of graded impeller structure on grading performance was studied. Finally, the optimal design of grading impeller is carried out.