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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3187-3201.DOI: 10.16552/j.cnki.issn1001-1625.2026.0196

• 资源综合利用 • 上一篇    下一篇

利用磷石膏制备的CaSO4合成高性能胶凝材料

陈熠恒(), 房可能, 陈前林()   

  1. 贵州大学化学与化工学院,贵阳 550025
  • 收稿日期:2026-03-04 修订日期:2026-06-01 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 陈前林,博士,教授。E-mail:cql1018@163.com
  • 作者简介:陈熠恒(1999—),男,硕士研究生。主要从事磷石膏资源化利用方面的研究。E-mail:295054671@qq.com
  • 基金资助:
    贵州省教育厅自然科学研究项目(QJJ[2022]001)

Synthesis of High-Performance Cement Materials Using CaSO4 Prepared from Phosphogypsum

CHEN Yiheng(), FANG Keneng, CHEN Qianlin()   

  1. School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
  • Received:2026-03-04 Revised:2026-06-01 Published:2026-09-15 Online:2026-10-09

摘要:

为提高磷石膏(PG)资源化利用率,本研究利用PG转晶制备的无水石膏(AH)、煅烧PG制备的半水石膏(HPG)、硫铝酸钙(CAS)和氧化钙(CaO),开发了基于PG的可持续快凝高强胶凝材料(AHCSO)。结果表明:胶凝材料的最佳配方为70%(质量分数,下同)AH、20%HPG、0.3%聚羧酸减水剂(PCE)、7%CAS和3%CaO,此时材料展现出优异的快凝特性,初凝时间为0.3 h,终凝时间为0.5 h;1 d抗压强度达20.8 MPa(绝干强度达29.0 MPa),3 d达到35.0 MPa(绝干强度达38.1 MPa),28 d抗压强度增长至39.8 MPa(绝干强度达45.7 MPa),软化系数为0.89,PG的利用率高达90%(其中70%为AH,20%为HPG)。最终,该胶凝材料的水化速率、凝结时间与孔隙结构得到协同调控,成功制备出具有快凝高强特性的AHCSO。

关键词: 磷石膏, 无水石膏, 大掺量, 快凝, 早强, 高效资源化利用

Abstract:

To improve the resource utilization rate of phosphogypsum (PG), in this study, anhydrous gypsum (AH) prepared by the PG crystallization method, hemihydrate gypsum (HPG) prepared by calcining PG, calcium sulfoaluminate (CAS), and calcium oxide (CaO) were used to develop a sustainable, fast-setting, high-strength cementitious material (AHCSO) based on PG. The results indicate that the optimal formulation for the cementitious material—comprising 70% (mass fraction, the same below) AH, 20% HPG, 0.3% polycarboxylic acid superplasticizer (PCE), 7% CAS, and 3% CaO—exhibits excellent rapid-setting properties, with an initial setting time of 0.3 h and a final setting time of 0.5 h. This cementitious material achieves a compressive strength of 20.8 MPa after 1 d (29.0 MPa when completely dry), 35.0 MPa after 3 d (38.1 MPa when completely dry), and 39.8 MPa after 28 d (45.7 MPa when completely dry), softening coefficient of 0.89 and a PG utilization rate as high as 90% (AH 70%, HPG 20%). Ultimately, the hydration rate, setting time, and pore structure of this cementitious material are synergistically controlled, leading to the successful preparation of AHCSO with rapid-setting and high-strength properties.

Key words: phosphogypsum, anhydrous gypsum, high blend ratio, quick setting, early strength, efficient resource utilization

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