... high sifting rate 3,Have no dust pollution 3,Frequency control Application In the past,the grinded materials are easy ... fineness can be adjustable by the frequency converter adjust the speed of the motor.After that,the qualified powders are sucted into ... pipeline and the main grinder. 3, Vertical pulverizing ,frequency control of motor speed, air seperate,without sieve,100mm materials can be feeded,so ...