Rotary Drum Dryer 1.for drying mineral ore, sand, coal,bagasse, rice husk and saw dust 2 ... for drying slag, limestone, coal powder, clay, sawdust, oil palm fiber, grass, river stone, poultry dung, ores, rock sand and etc ... drier heating source: coal, coal gas, natural gas, LPG gas, wood, and etc.4. Rotary Dryer Drum Drier Mode of flow ... .9 High Eficiency Rotary Drum Dryer for Slag, coal, wood, bagasse