Patent ID: 9340455
Filing Date: 2016-05-17
CPC Classification: C04B

Claim Text:
1. A method for the production of a hard plaster, comprising: feeding a plaster material, predominantly comprising a beta-hemihydrate plaster, to a postreactor, wherein a temperature is set to at least a calcining temperature of 95° C. during this step; posttreating the plaster material in the postreactor to form the hard plaster, the beta-hemihydrate plaster being converted directly into an alpha-hemihydrate plaster at a temperature above the calcining temperature of 95° C.; discharging the hard plaster out of the postreactor; and cooling the hard plaster, wherein conversion is carried out in the postreactor during continuous operation, conversion of the beta-hemihydrate plaster occurs with a dwell time in the postreactor of less than 30 minutes, steam is externally supplied to the postreactor, and a temperature and pressure in the postreactor are regulated so that the temperature is at least 95° C. and an overpressure prevails in the postreactor.