... rotary drying machine, sand dryer, sawdust dryer, coal dryer, coal slime dryer, bentonite dryer, ore concentrate dryer ... of materials which contain moisture, such as coal, coal slurry, slag, industrial waste, and clay stone ... I use the coal or gas as the heating source?Yea, you can use coal, gas, electricity, oil ... other structure. 2. The fuel can be coal, fire, gas, and electricity and other fuel. 3. ...