Used 12" Dia Rotary Calciner. Tube is 12" diameter (305 mm) x 22'6" long (7 meter). Indirect Natural gas fired with 8 zones. Approximate overall size is 29'6" long (9 meter) x 9'3/4" (3 meter) high and 2m wide. Barrel is SS. Drying temperature 932-1,112F (500-600C). Calcining temperature 1,382-1,472F (750-800C). Max operating temperature 1,652F (900C). Residence time 1-2 hours. Production 10 kg solids/hour. Atmosphere 3% H2/N2. Furnace is used to calcine minerals in powder form or slurry under a protective Hydrogen / Nitrogen atmosphere.