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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1671-1681.DOI: 10.16552/j.cnki.issn1001-1625.2025.1025

• 资源综合利用 • 上一篇    下一篇

微生物改性磷石膏对石膏矿渣水泥性能的影响

任骏1(), 晏云潇1, 李苗源2, 田镇赫3, 赵立兴4, 王大富1()   

  1. 1.云南大学建筑与规划学院,昆明 650500
    2.河海大学力学与工程科学学院,南京 210098
    3.中国建筑第七工程局有限公司,郑州 450004
    4.云南大学化学科学与工程学院,昆明 650091
  • 收稿日期:2025-10-22 修订日期:2025-12-09 出版日期:2026-05-15 发布日期:2026-06-10
  • 通信作者: 王大富,博士,讲师。E-mail:wangdafu92@163.com
  • 作者简介:任 骏(1986—),男,博士,教授。主要从事水泥基材料的研究。E-mail:renjunking@aliyun.com
  • 基金资助:
    国家自然科学基金(U24A202166);国家自然科学基金(52168038);云南省科学技术厅项目(202301AT070192)

Effect of Microbial-Modified Phosphogypsum on Properties of Supersulfated Cement

REN Jun1(), YAN Yunxiao1, LI Miaoyuan2, TIAN Zhenhe3, ZHAO Lixing4, WANG Dafu1()   

  1. 1.School of Architecture and Planning,Yunnan University,Kunming 650500,China
    2.College of Mechanics and Engineering Science,Hohai University,Nanjing 210098,China
    3.China Construction Seventh Engineering Division Co.,Ltd.,Zhengzhou 450004,China
    4.College of Chemical Science and Engineering,Yunnan University,Kunming 650091,China
  • Received:2025-10-22 Revised:2025-12-09 Published:2026-05-15 Online:2026-06-10

摘要:

本文旨在探究不同改性方式处理的磷石膏对石膏矿渣水泥(SSC)性能的影响,阐明抗压强度提升机理及细菌在水化过程中的演化规律。在确定SSC最佳配合比(m(矿渣)∶m(磷石膏)∶m(水泥)=0.84∶0.13∶0.03)的基础上,系统研究了水洗、碱洗、微生物处理及协同处理对SSC性能的影响。通过标准稠度用水量、凝结时间及抗压强度测试,结合XRD与SEM分析水化产物和孔结构的演变。结果表明:微生物协同碱洗处理效果最优,与对照组相比,微生物处理使标准稠度用水量增加,终凝时间较处理前缩短30%左右,3 d抗压强度提升了298%~349%,28 d仍提升了40%~58%。微生物处理通过去除磷、氟杂质,提高水化体系pH值,借助细菌细胞壁提供成核位点和生物矿化等作用,促进C-S-H、钙矾石和碳酸钙等水化产物生成,优化孔结构。

关键词: 微生物, 磷石膏, 石膏矿渣水泥, 力学性能, 微观结构

Abstract:

In the context of global carbon peaking and carbon neutrality goals, the development of low-carbon, low-energy-consumption cementitious materials has become an important trend in the field of building materials. Supersulfated cement (SSC), as a green cementitious material mainly composed of granulated blast-furnace slag, phosphogypsum and a small amount of cement clinker, has the advantages of low calcination energy consumption and high industrial solid waste utilization. However, untreated phosphogypsum contains harmful impurities such as phosphorus and fluorine, which seriously inhibit the hydration process of SSC, leading to long setting time and low early strength, limiting its large-scale engineering application. Traditional modification methods such as water washing and alkali washing have problems such as low impurity removal efficiency, high energy consumption, and secondary pollution.This study aims to systematically explore the effects of water washing, alkali washing, microbial treatment and microbial-alkali synergistic treatment on the macro-performance and microstructure of SSC, and reveal the enhancement mechanism of microbial modification. On the basis of the optimized mix ratio of m(slag)∶m(phosphogypsum)∶m(cement clinker)=0.84∶0.13∶0.03, the standard consistency water demand, setting time, and compressive strength of SSC were tested in accordance with Chinese national standards. The hydration products, micromorphology, pore structure and thermal stability were characterized by XRD, SEM, MIP and TG/DTG.The results show that all modification treatments can effectively improve the performance of SSC, and the microbial-alkali synergistic treatment shows the best effect. Microbial treatment increases the standard consistency water demand of SSC, shortens the initial and final setting time, which are about 20% and 30% shorter than those of the untreated group, and significantly improves the compressive strength. Compared with the control group, the 3 d compressive strength increases by 298%~349%, and the 28 d compressive strength still increases by 40%~58%. Microbial modification removes 40.24%~53.33% of total phosphorus and 34.91%~48.11% of fluoride impurities, reduces the median particle size of phosphogypsum, raises the pH value of the pore solution by about 0.98 units, and promote the formation of C-S-H gel, ettringite and calcium carbonate. Microscopic characterization shows that microbial treatment optimizes the pore structure, increases the proportion of harmless pores below 20 nm, reduces the total porosity, and makes the matrix denser.The innovation of this study lies in the first systematic comparison of multiple modification methods of phosphogypsum, clarification of the evolution pattern of bacteria in the hydration process of SSC. Bacterial cell walls act as nucleation sites to adsorb Ca2?, and the lysed organics further promote biomineralization, forming a synergistic mechanism of impurity removal, alkalinity improvement, nucleation promotion and pore filling. This research provides a green and efficient modification route for the high-value utilization of phosphogypsum, enriches the application theory of biomineralization in cement-based materials, and offers important academic value and engineering guidance for the development of high-performance low-carbon cement.

Key words: microorganism, phosphogypsum, supersulfated cement (SSC), mechanical property, microstructure

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