1.Rotary dryer introduction: The rotary drum dryer is used for drying materials with humidity or granularity in the industries of mineral dressing, building material, metallurgy and chemical. Rotary dryer can be used for drying many kinds of materials with convenient and reliable operation; therefore, the dryer machine has been widely used. 2. Rotary dryer application: Rotary drum drying machine (also called drum dryer) is widely used in building material, metallurgy, chemical industry, cement industry to dry slag, limestone, coal powder, clay, etc. It is of simple structure, polished manufacture, high capacity, low energy-consumption, convenient transportation and so on. 3. Operation