可溶性磷对大掺量磷石膏胶凝材料水化过程的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (9): 3303-3312.

可溶性磷对大掺量磷石膏胶凝材料水化过程的影响

康雪儿¹, 黄赟^1,2, 刘刚^1,2, 何明皓¹, 万惠文²

1.武汉理工大学材料科学与工程学院,武汉 430070;
2.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

收稿日期:2024-01-23 修订日期:2024-03-18 出版日期:2024-09-15 发布日期:2024-09-19
通信作者: 黄赟,博士,副研究员。E-mail:huangyunwh@163.com
作者简介:康雪儿(1998—),女,硕士研究生。主要从事工业固废的研究。E-mail:3054307105@qq.com
基金资助:
湖北省科学技术厅重点研发计划(2021BCA126)

Effect of Soluble Phosphorus on Hydration Process of High Content Phosphogypsum Cementitious Materials

KANG Xueer¹, HUANG Yun^1,2, LIU Gang^1,2, HE Minghao¹, WAN Huiwen²

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2024-01-23 Revised:2024-03-18 Published:2024-09-15 Online:2024-09-19

摘要/Abstract

摘要： 磷石膏中的杂质如残余酸、可溶性磷会对磷石膏胶凝材料的配比和强度发展造成很大影响。本文用两种不同品质的磷石膏,与矿渣和水泥复合制备磷石膏掺量为60%、70%和80%(质量分数)的胶凝材料,并对磷石膏进行湿磨改性。通过测试胶凝材料孔溶液pH值、矿渣水化程度和抗压强度,并结合XRD、SEM-EDS等测试方法探究可溶性磷杂质对大掺量磷石膏胶凝材料水化过程的影响。结果表明:大掺量磷石膏胶凝材料中硅酸盐水泥的最佳掺量与磷石膏中所含的可溶性磷杂质有关,杂质含量越高水泥最佳掺量越高;磷石膏通过湿磨中和预处理后,可改善胶凝材料的7 d强度,但并不能提高28 d强度;复合胶凝材料的强度取决于矿渣水化程度,水化过程中磷石膏中可溶性磷与水泥水化的Ca(OH)₂形成磷酸钙沉淀覆盖在矿渣表面上,阻碍了矿渣水化,是影响其强度发展的主要原因。

关键词: 磷石膏, 水硬性胶凝材料, 可溶性磷, 水化程度, 抗压强度, 湿磨改性

Abstract: Impurities such as residual acid and soluble phosphorus content in phosphogypsum have a great impact on the ratio and strength development of phosphogypsum cementitious material. Two different qualities of phosphogypsum were used to composite with slag and cement to prepare cementitious materials with phosphogypsum content of 60%, 70%, and 80% (mass fraction), and wet grinding modification was carried out on phosphogypsum. By testing the pH value of the pore solution of the cementitious material, the degree of slag hydration, and compressive strength, and combining XRD, SEM-EDS and other testing methods, the influence of soluble phosphorus impurities on the hydration process of high dosage phosphogypsum cementitious materials was explored. The results show that the optimal dosage of Portland cement in high dosage phosphogypsum cementitious material is related to the soluble phosphorus impurities contained in phosphogypsum. The higher the content of impurities, the higher the content of cement. After wet grinding pretreatment, 7 d strength of the cementitious material can be improved, but cannot increase the 28 d strength. The strength of the composite cementitious material depends on the degree of slag hydration. During the hydration process, the soluble phosphorus in phosphogypsum and the Ca(OH)₂ hydrated by cement form calcium phosphate precipitates on the surface of the slag, which hinders the hydration of the slag and is the main reason affecting the development of its strength.

Key words: phosphogypsum, hydraulic binding material, soluble phosphorus, hydration degree, compressive strength, wet milling modification

中图分类号:

TQ177.3

康雪儿, 黄赟, 刘刚, 何明皓, 万惠文. 可溶性磷对大掺量磷石膏胶凝材料水化过程的影响[J]. 硅酸盐通报, 2024, 43(9): 3303-3312.

KANG Xueer, HUANG Yun, LIU Gang, HE Minghao, WAN Huiwen. Effect of Soluble Phosphorus on Hydration Process of High Content Phosphogypsum Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3303-3312.

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