... , limestone, coal powder, clay, sawdust, oil palm fiber, grass, river stone, poultry dung, ores, rock sand and etc for our customers ... drier heating source: coal, coal gas, natural gas, LPG gas, wood, and etc.4. Rotary Dryer Drum Drier Mode of flow ... -45104.9 High Eficiency Rotary Drum Dryer for Slag, coal, wood, bagasse