The Prater Rotomill is a vertical milling product that can sometimes be referred to as a “Long Gap Mill”. This unit is expecially adapt at grinding abrasive, high moisture or generally difficult to grind materials. Untilizing rotor speed and air the particle size output can be adjusted to meet the application requirements. As an added benefit the air used with this unit can be heated to provide drying of the mateiral while grinding improving process efficiency. This unit is avaialble in 8 sizes from 15 to 750 HP.