Patent ID: 7371278
Filing Date: 2008-05-13
Classification: B01F,C04B,F26B

Abstract:
1. Process for stabilizing a calcined β-hemihydrate plaster comprising the steps of: a) providing a heated hemihydrate plaster preferably at temperatures over 100° C.; b) feeding the heated plaster in a moistening device having walls heated to at least 100° C.; c) injecting water and/or steam into the moistening device in conditions that such not yet moistened surfaces of the plaster are exposed to the injected water and/or steam; d) maintaining an atmosphere in the moistening device at a level of the dew point in the range of 75 to 99° C.; e) feeding the moistened blend into a curing device; f) maintaining an atmosphere in the curing device above 75° C. for at least 3 minutes; g) feeding the moistened and cured blend into a drying device; and h) drying said moistened and cured blend.