| 摘要 |
The invention relates to a method of preparing stabilised calcium sulphate anhydrite III. The inventive method comprises the following successive steps consisting in: a) heating a powdered starting material to a temperature of between 220 DEG C and 320 < DEG >C, so as to form soluble anhydrite III; and b) subjecting the material thus transformed to a thermal quenching process, so as to lower the temperature thereof by at least 150 < DEG >C in order to obtain a temperature that is at least less than 100 < DEG >C and, preferably, less than 80 < DEG >C, in less than 2 minutes and, preferably, in less than 20 seconds, such as to obtain the aforementioned stabilised anhydrite III. The invention is characterised in that the powdered starting material is ground to produce a particle size of less than 200 ñm and, preferably, of less than 150 ñm and mainly comprises calcium sulphate hemihydrate. |
