PROCESS FOR MANUFACTURE OF GYPSUM BINDER Russian patent published in 1994 - IPC

FIELD: constructional materials industry. SUBSTANCE: process for manufacture of gypsum binder includes such steps as crushing, dehydration of gypsum dihydrate and grinding. Disclosed process prescribes crushing gypsum dihydrate to fraction of 10 to 500 mm and dehydrating it in superhigh-frequency electromagnetic field at 0.5 to 50 kW during 10 to 60 min to produce gypsum binder which contains 70 to 90 mass percent calcium sulfate alpha-polyhydrate and 10 to 30 mass percent calcium sulfate beta-polyhydrate. Brand strength of thus manufactured binder is 70 kg/sq. cm. EFFECT: higher quality. 1 tbl