| 摘要 |
A method for processing a pulverulent calcium sulphate material in order to obtain a hydraulic binder is described, including combining the following two successive processing steps: (a) heating the pulverulent material in a curing tunnel (1) at a temperature of 220-360 ~C, under conditions suitable for primarily forming an .alpha.-type calcium sulphate, and (b) subjecting the heated material to a thermal quenching step in a cooling apparatus (2), with a cold, dry gas to stabilise the .alpha. anhydrite and to prevent its conversion into other crystallographic types. The method provides a novel hydraulic binder with an .alpha. anhydrite content of more than 35 wt.%, and with improved strength and behaviour in fire resistance properties. |
