There are two types of ball mill (also called cement mill) plant process: closed-circuit system and open circuit system. We use the closed-circuit system as the standard because it is more energy-efficient and can grind different types of cement. The circular-flow grinding system composed of ball mill and high-efficiency powder separator, together with dust-removing equipment, forms an independent and complete cement grinding, bulk and packing line. The cement mill plant realizing the purpose of high quality, high yield and low consumption. Cement grinding plant designed by Baichy Machinery does not cause large environmental pollution, economic and social benefits are obvious.