calcining gypsum dryer

Jun 18 2009 A gypsum dryercalciner includes a calcining space a first pipe having an inlet connected to a source of hot gases and an outlet emerging in the calcining space a second pipe having an inlet connected to a source of gypsum and an outlet emerging in the calcining space the second pipe being concentric with the first pipe and a forcefeeding screw positioned at least partially in the