11.16 Gypsum Manufacturing
11.16 Gypsum Manufacturing 11.16.1 Process Description1-2 Gypsum is calcium sulfate dihydrate (CaSO4 2H2O), a white or gray naturally occurring ... the sum of the roller mill and kettle calciner output rates. k References 4-5,11,13-14. Emission factors based on the kettle and the hot pit do not apply to batch kettle calciners.