Q相对脱硫石膏氯离子固化和抗压强度的影响  

Influence of Q Phase on Chloride Ion Immobilization and Compressive Strength of FGD Gypsum

作　　者：武春夏 杨正波 李帆[1,2,3] 陈红霞 何健辉 张晓菲 杨露 WU Chunxia;YANG Zhengbo;LI Fan;CHEN Hongxia;HE Jianhui;ZHANG Xiaofei;YANG Lu(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Beijing New Building Materials Public Limited Company,Beijing 102209,China;School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]北新集团建材股份有限公司,北京102209 [4]武汉理工大学安全科学与应急管理学院,武汉430070

出　　处：《硅酸盐通报》2022年第5期1758-1764,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51802238);固废资源化利用与节能建材国家重点实验室开放基金(SWR-2021-008)。

摘　　要：受限于高氯离子迁移性能,大量品质较低的脱硫石膏在石膏制品中无法被有效利用。本文研究了Q相(Ca_(20)Al_(26)Mg_(3)Si_(3)O_(68))对脱硫石膏中氯离子迁移性能的影响规律与机理。结果表明,在脱硫石膏中以10%~30%(质量分数)的比例掺入Q相,其水化产物主要为二水硫酸钙、钙矾石和AH_(3)凝胶,脱硫石膏样品中氯离子固化率和绝干抗压强度均得到了较大提升。掺入30%的Q相对脱硫石膏性能提升效果最佳,此时氯离子固化率达19.55%,石膏的绝干抗压强度提升了约51.5%。结合XRD、SEM和综合热分析探明了Q相-脱硫石膏水化产物中钙矾石、AH_(3)凝胶对氯离子固化和石膏力学性能改善的作用机理。Limited by high chloride ion migration,lots of low-grade FGD gypsum cannot be effectively used in gypsum products.The influence and mechanism of Q phase(Ca_(20)Al_(26)Mg_(3)Si_(3)O_(68))on the migration of chloride ion in FGD gypsum were studied.The results show that the hydrates of gypsum-Q phase in which 10%~30%(mass fraction)of Q phase is blended are mainly calcium sulfate dihydrate,ettringite and gibbsite.The chloride ion immobilization capacity and absolute dry compressive strength of the FGD gypsum sample are greatly improved.Adding 30%Q phase achieves the best performance improvement compared with FGD gypsum.At this time,the chloride ion immobilization capacity reaches 19.55%and the absolute dry compressive strength of the gypsum increases 51.5%.Combining XRD,SEM and thermal analysis,the mechanism of ettringite and gibbsite in the FGD gypsum-Q phase hydrates on the immobilization of chloride ion and the improvement of the mechanical properties of the gypsum are explored.

关 键 词：脱硫石膏 Q相 氯离子固化 抗压强度 钙矾石 AH_(3)凝胶 

分 类 号：TU526[建筑科学—建筑技术科学]