Q相对脱硫石膏氯离子固化和抗压强度的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1758-1764.

Q相对脱硫石膏氯离子固化和抗压强度的影响

武春夏^1,2, 杨正波^3,4, 李帆^1,2,3, 陈红霞³, 何健辉^1,2, 张晓菲³, 杨露¹

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

收稿日期:2021-12-20 修回日期:2022-03-03 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 杨露,博士,研究员。E-mail:yanglu@whut.edu.cn
作者简介:武春夏(1998—),男,硕士研究生。主要从事石膏和水泥方面的研究。E-mail:2862740093@qq.com
基金资助:
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)

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

WU Chunxia^1,2, YANG Zhengbo^3,4, LI Fan^1,2,3, CHEN Hongxia³, HE Jianhui^1,2, ZHANG Xiaofei³, YANG Lu¹

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. Beijing New Building Materials Public Limited Company, Beijing 102209, China;
4. School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China

Received:2021-12-20 Revised:2022-03-03 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

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(Ca₂₀Al₂₆Mg₃Si₃O₆₈)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AH₃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、AH₃凝胶对氯离子固化和石膏力学性能改善的作用机理。

关键词: 脱硫石膏, Q相, 氯离子固化, 抗压强度, 钙矾石, AH₃凝胶

Abstract: 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 (Ca₂₀Al₂₆Mg₃Si₃O₆₈) 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.

Key words: FGD gypsum, Q phase, chloride ion immobilization, compressive strength, ettringite, gibbsite

中图分类号:

TU526

武春夏, 杨正波, 李帆, 陈红霞, 何健辉, 张晓菲, 杨露. Q相对脱硫石膏氯离子固化和抗压强度的影响[J]. 硅酸盐通报, 2022, 41(5): 1758-1764.

WU Chunxia, YANG Zhengbo, LI Fan, CHEN Hongxia, HE Jianhui, ZHANG Xiaofei, YANG Lu. Influence of Q Phase on Chloride Ion Immobilization and Compressive Strength of FGD Gypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1758-1764.

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