... for drying slag, limestone, coal powder, clay, sawdust, oil palm fiber, coconut fiber, grass, river stone, poultry dung, ores, rock sand and ... collector, furnace and etc. 3. heating source: coal, coal gas, natural gas, LPG gas, wood, and etc. 4. Mode of flow ... different materials. 5.Its principle of operation:The raw material plate which is arranged reasonably with changeable angles in order, throws ...