Rotary furnace is mainly used for melting.
Lead Aluminum melting Copper melting etc.
Rotary furnace is gas fired, diesel fired of furnace oil fired. The rotary furnace is rotated or tilted. One end burner will be fitted and other end will be having movable exhaust duct to load material . The exhaust duct will be having cyclone seperator, wet scrubber or dry scrubber, bag house etc.