公开(公告)号：WO1994004472A1

公开(公告)日：1994-03-03

申请号：PCT/FR1993000814

申请日：1993-08-16

Applicant: MACE HOLDING S.A. ,  MACE, Patrick

Inventor： MACE HOLDING S.A.

IPC: C04B11/028

CPC classification number: C04B11/02 ,  F27B7/06 ,  F27B7/08 ,  F27B7/14 ,  F27D2019/0009 ,  C04B11/028

Abstract: Process for baking gypsum under superheated steam conditions consisting in stirring the charge in a rotary horizontal cylindrical oven and independently adjusting oven chamber pressure and temperature according to the temperature of the gypsum, the ambient temperature and pressure in said chamber and the charge's mass. The baking process according to the invention provides a high quality beta semihydrate-type plaster with a treatment cycle of less than one hour, and also provides all types of plasters, especially a blend of beta semihydrate and anhydrite II. The oven for carrying out said process includes means for sealing off its ends so that treatment can be carried out under controlled pressure. It also includes at its outlet, a sealed housing (19) with facilities (43) for receiving temperature and pressure sensors and especially a pyrometer (42) inserted into the central part of the oven to monitor the charge's temperature. At the same time that they monitor temperature and pressure, the sensors (13) indicate the evolution of the mass of the charge to be treated. A computer analyzes and processes all this data, adjusting oven chamber pressure and temperature as required, especially according to the type of plaster desired.

Abstract translation: 在过热蒸汽条件下焙烧石膏的方法，其中包括在旋转水平圆柱形炉中搅拌电荷，并根据石膏的温度，所述室中的环境温度和压力以及电荷质量独立地调节烘箱室压力和温度。 根据本发明的烘烤方法提供了处理循环小于1小时的高品质β半水合物膏药，并且还提供所有类型的膏药，特别是半水合物和无水石膏II的混合物。 用于进行所述方法的烘箱包括用于密封其端部的装置，使得可以在受控压力下进行处理。 它还包括在其出口处具有用于接收温度和压力传感器的设备（43）的密封壳体（19），特别是插入烤箱中部的高温计（42）以监测充电温度。 在监测温度和压力的同时，传感器（13）表示待处理电荷质量的演变。 计算机分析和处理所有这些数据，根据需要调节烘箱的压力和温度，特别是根据所需的石膏的类型。