透明质酸对脱硫石膏制备高分散性α-半水石膏形貌和强度的影响  

Effect of Haluronic Acid on Morphology and Strength of Highly Dispersedα-Calcium Sulfate Hemihydrate from FGD Gypsum

作　　者：冯驸 胡超 张苏萌 刘佳衡 胡盛 周红艳 胡卫兵[1] FENG Fu;HU Chao;ZHANG Sumeng;LIU Jiaheng;HU Sheng;ZHOU Hongyan;HU Weibing(Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Enshi 445000, China;College of Chemistry and Environmental Engineering, Hubei Minzu University, Enshi 445000, China)

机构地区：[1]生物资源保护与利用湖北省重点实验室,恩施445000 [2]湖北民族大学化学与环境工程学院,恩施445000

出　　处：《硅酸盐通报》2020年第6期1842-1847,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(21767010)。

摘　　要：在常压,Ca(NO3)2-KCl溶液中,以脱硫石膏为原料,研究了聚合物大分子透明质酸转晶剂浓度和pH值对α-半水石膏晶体生长的影响。实验结果表明,pH值为5.5,转晶剂透明质酸浓度为3.0 g·L-1时,制备的α-半水石膏为规整度高、分散性好的六边短柱状晶体。α-半水石膏水化硬化浆体力学性能测试显示,浆体抗压强度和抗折强度随着α-半水石膏晶体长径比减小和规整度的增加而逐渐变大,其最大值分别为58.8 MPa和28.5 MPa,属于高强石膏。This paper studied to prepare highly uniformα-calcium sulfate hemihydrate(α-HH)using desulfurization gypsum(FGD gypsum)in Ca(NO3)2-KCl solutions under atmospheric pressure.The effect of crystal modifier haluronic acid(HA)concentration and solution pH on crystallization ofα-HH were investigated in salt solution.The research shows that ideal hexagonal prismα-HH can be prepared in the case of 3.0 g·L-1 haluronic acid and solution pH value of 5.5.The dry compression strength and dry bending strength of the hydration molding are enhanced,with the decreased aspect ratio and highly uniform ofα-HH,and the maximum value are 58.8 MPa and 28.5 MPa,respectively.

关 键 词：脱硫石膏 Α-半水石膏 转晶剂 力学强度 

分 类 号：TQ177[化学工程—硅酸盐工业]