METHOD FOR PRODUCING ANHYDROUS GYPSUM, ANHYDROUS GYPSUM, AND QUICK HARDENING CEMENT

摘要

PROBLEM TO BE SOLVED: To provide anhydrous gypsum which is a new anhydrous gypsum replacing fluorogypsum and can produce quick hardening cement excellent in strength development, and to provide quick hardening cement excellent in strength development. SOLUTION: The method for producing anhydrous gypsum can obtain anhydrous gypsum by heating gypsum dihydrate in a steam atmosphere of higher than 180°C and not higher than 195°C. The quick hardening cement comprises anhydrous gypsum obtained by the method. COPYRIGHT: (C)2009,JPO&INPIT