It is divided into cylindrical vertical roller mill, roller vertical roller mill, disc vertical roller mill, ring vertical roller mill, in addition, have rotor vertical roller mill, belt vertical mill, conical vertical roller mill, but these types of vertical roller mills have been used less.5 Constant, alternating, pulsating magnetic field vertical roller millAccording to the way the magnetic field strength changes:

1) Constant magnetic field vertical roller mill. Using a permanent magnet material and a direct current electromagnet, a solenoid, or the like as a magnetic source, the magnitude and direction of the magnetic field strength do not change with time.

2) Alternating magnetic field vertical roller mill. An electromagnet that is connected to an alternating current is used as a magnetic source. The magnitude and direction of the magnetic field strength changes over time.

3) Pulsating magnetic field vertical roller mill. An electromagnet that simultaneously transmits direct current and alternating current is used as a magnetic source. The magnitude of the magnetic field varies with time, but the direction does not change. And pulse