... ring .The heating source can be coal ,electricity ,gasoline, ,natural gas and so on .In order to cut the cost ,coal is ... ring .The heating source can be coal ,electricity ,gasoline, ,natural gas and so on .In order to cut the cost ,coal is ... mainly consist of rotary body ,raw material feeding plate ,driving and supporting device ,etc. Main technical parameters of dryer : modeldiameterlengthSlope(°) ...