The systematic experimental investigations were carried out using TCF-360 centrifugal air classifier with the vane rotor. The relationship among the operating parameters and cut size and sharpness index of the air classifier was established. The results showed that the classifier rotating speed, the volumetric flow rate, the secondary air flow rate, the solids loading in the classification zone, and the particle size distribution of raw material have strong influence on the performance of an air classifier. If the air flow and the rotating speed of the classifier are altered to the same extent between the air drag force and the centrifugal force, the cut size will change a little, but the sharpness index and the wear rate will increases as the air flow rate and rotating speed are raised. The investigations can help to improve the operation conditions and also to optimize the geometry of an air classifier.
