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