... the one drum rotary drye.Three Drum Dryer Application: Mainly used in drying Slag, Sand, Coal, Iron Powder, Ore, Quartz ... drum, because there are the spiral shape boards fixed in the drum, when the dryer make rotary working, ... work principle, the material go into outside drum, in the drying working process, the material make three times ... -956-846 Rotary dryer for silica sand used in construction field