煅烧硬石膏溶解水化性能及煅烧活化机制研究  

Dissolution and Hydration Performance of Calcined Anhydrite and Its Calcination Activation Mechanism

作　　者：彭家惠[1] 董军[2] 张建新[1] 白冷[1] 万体智[1] 

机构地区：[1]重庆大学建筑材料工程系,重庆400045 [2]煤炭科学研究总院重庆研究院,重庆400037

出　　处：《建筑材料学报》2010年第1期111-115,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50572126)

摘　　要：采用BaSO4重量法、原子吸收分光光度法、SEM扫描电镜和TG热重分析等测试方法,研究了天然硬石膏的相组成、水化进程、溶解过程和二水石膏析晶过饱和度,胶结材硬化体的微结构和强度,并对硬石膏的煅烧活化机制进行了分析.经150℃煅烧后,硬石膏的各方面性能产生了变化:硬石膏中的CaSO4.2H2O生成了β-半水石膏,而β-半水石膏能够快速水化生成CaSO4.2H2O,对硬石膏水化产生晶种诱导效应;硬石膏溶解水化活性显著提高,凝结时间缩短,水化进程加快;结构松弛,易磨性提高,液相过饱和度增大,水化速率和水化率增大.By using barium sulfate gravimetric method,atomic absorption spectrophotometry, stereoscan and thermogravimetric analysis,many investigations were carried out on phase composition,hydration process,dissolution course and degree of supersaturation,microstructure and intensity of hardened anhydrite.Calcination activation mechanism was also analysed.The results indicate that some semi-hydrated gypsum in calcined anhydrite hydrates immediately after burning in 150 ℃,and the product dihydrate gypsum has seed crystal induction effect to hydration of anhydrite.Dissolution and hydration performance of anhydrite are improved,the structure is loose,and dissolution ability,degree of supersaturation, hydrated speed and hydration rate are enhanced after calcination.

关 键 词：硬石膏 煅烧 溶解 活化 

分 类 号：TQ177.32[化学工程—硅酸盐工业]