盐溶液浓度对常压水热法制备α-半水脱硫石膏的影响  

The Effect of Salt Solution Concentration on the Preparation of α-Calcium Sulfate Hemihydrate from FGD Gypsum Using the Hydrothermal Method under Atmospheric Pressure

作　　者：刘先锋[1,2] 舒渝艳[2] 魏桂芳[1] 彭家惠[1] 周岳富[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆科技学院建筑工程学院,重庆401331

出　　处：《科学技术与工程》2012年第16期3877-3879,3888,共4页Science Technology and Engineering

基　　金：国家自然科学基金项目(50872160);重庆市自然科学基金项目(cstc2011jjA20002);重庆科技学院"优秀创新人才培养计划"项目(201105)资助

摘　　要：采用常压水热法制备α-半水脱硫石膏,研究在不加转晶剂时盐溶液对脱硫石膏脱水生成α-半水石膏的晶体形貌、转化率和转化速率的影响规律。用偏光显微镜测定晶体形貌,通过脱水反应前后结晶水含量变化计算转化率,用转化率随反应时间的变化表示转化速率。结果表明:盐浓度增大,生成晶体越细小,反应速率和转化率变化不大;适当NaCl浓度为15%～20%。The laws of crystal growth, percent conversion and the rate of reaction of eL-calcium sulfate hemihy-drate from FGD gypsum in salt solution with different concentration using the hydrothermal method under atmospheric pressure are studied. The crystal morphology was observed by using polarizing microscope profile, and percent conver-sion and the rate of reaction were obtained by assaying crystal water content and calculating. The results show, with the increase of salt concentration, the formed α-calcium sulfate hemihydrate crystal is smaller, percent conversion and the rate of reaction are nearly unchanged; the perfect salt concentration is ranging from 15% to 20%

关 键 词：脱硫石膏 Α-半水石膏 常压水热法 高强石膏 

分 类 号：TQ177.375[化学工程—硅酸盐工业]