... rotary drye.Three Drum Dryer Application: Mainly used in drying Slag, Sand, Coal, Iron Powder, Ore ... Process:In the input system, there are fan and burner devices. In the discharge system, there are discharge ... the inside drum, because there are the spiral shape boards fixed in the drum, when the dryer ... principle, the material go into outside drum, in the drying working process, the material make three ...