Patent ID: 6706113
Filing Date: 2004-03-16
Classification: C04B

Abstract:
A process for synthesizing a hydraulic binder from natural calcium sulfate or synthesized calcium sulfate, consisting in treating said calcium sulfate to form:a hydraulic binder comprising anhydrite III or &agr; anhydrite comprising: a heating the calcium sulfate from ambient temperature to a temperature in the range 220Â° C. to 350Â° C. depending on the characteristics of the calcium sulfate in the treating step; rapidly quenching the product obtained by reducing its temperature from 220Â° C.-350Â° C. to less than 80Â° C. in less than two minutes, for stabilizing the &agr; anhydrite by crystallographic blocking and fixing; and obtaining an hydraulic binder that contains more than 70% of stable, soluble anhydrite III or &agr; anhydrite.