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20161219Grinding and calcining of gypsum with Pfeiffer grinding plants TEXT Eckhard Sander x H 2 O are obtained. GPSE Gypsum powder raw gypsum calcium sulphate dihydrate CaSO 4 2H 2 O a natural gypsum b synthetic gypsum atmospheric pressure beta plaster plaster produced in the gypsum kettle has the qual ity features of kettleproduced