During operation, material enters the classification flow field from the lower part of the classifier and is dispersed by the upward airflow. The material, along with the airflow, enters the cage-shaped turbine rotor, where coarse particles are ejected under centrifugal force and fall along the wall. During descent, they are further dispersed by secondary air and eventually discharged through the coarse material outlet. The fine particles pass through the rotor and are discharged through the fine material outlet. Fine material enters the second-stage classifier for further classification, with coarser particles discharged through the coarse material outlet. Qualified fine powder is discharged through the fine material outlet, collected in the cyclone, while material that cannot be collected by the cyclone is collected by the pulse bag filter. By adjusting the turbine speed and secondary air quantity, products of different fineness can be obtained.