可溶磷在α-半水石膏制备及水化过程中的影响

金属矿山 ›› 2026, Vol. 55 ›› Issue (2): 306-312.

可溶磷在α-半水石膏制备及水化过程中的影响

张晓翔^1,2　刘冬梅^1,2　鲍　浩^1,2　陈柳灼^1,2　覃　意³

1. 三峡大学土木建筑学院,湖北宜昌 443002;2. 防灾减灾湖北省重点实验室,湖北宜昌 443002;
3. 广西生态工程职业技术学院建筑与道桥工程学院,广西柳州 545004

出版日期:2026-02-15 发布日期:2026-03-04
通讯作者: 刘冬梅(1977—),女,副教授,博士,硕士研究生导师。
作者简介:张晓翔(1996—),女,硕士研究生。
基金资助:
国家自然科学基金项目(编号:52308266);湖北省自然科学基金青年项目(编号:2024AFB302)。

Effect of Soluble Phosphorus in the Preparation and Hydration of α-Hemihydrate Gypsum

ZHANG Xiaoxiang^1,2　LIU Dongmei^1,2　BAO Hao^1,2　CHEN Liuzhuo^1,2　QIN Yi³

1. College of Civil Engineering & Architecture,China Three Gorges University,Yichang 443002,China;
2. Hubei Key Laboratory of Disaster Prevention and Mitigation,Yichang 443002,China;
3. College of Civil Engineering & Architecture,Guangxi Eco-engineering Vocational and Technical College,Liuzhou 545004,China

Online:2026-02-15 Published:2026-03-04

摘要/Abstract

摘要： 研究旨在阐明可溶磷杂质对磷石膏高值化关键产品———α-半水石膏的制备、水化及性能的影响机制。
采用全过程模拟策略,通过在天然石膏中掺加不同含量(0、0. 1%、0. 3%、0. 6%)的KH2PO4 模拟可溶磷杂质,系统研
究了其在蒸压法制备及水化全过程中的作用规律。结果表明:可溶磷杂质显著改变了α-半水石膏的晶体习性,使其
形貌从规则的六棱柱状演变为短柱状乃至不规则棒状和颗粒状,并引起晶粒细化。同时,杂质显著加速了水化进程,
在含量为0. 3%时促凝效果最为显著,其初、终凝时间最短(分别为3 min 和5 min),水化放热峰也最早出现。然而,这
种加速效应导致水化产物二水石膏的晶体形貌劣化,由致密粗棒状转变为疏松多孔的细棒状、片状及不规则块状,晶
体间搭接作用减弱。最终,宏观力学性能随之恶化,绝干抗压强度持续下降,2 h 抗折强度亦在低含量微增后显著降
低。综上所述,为实现α-半水石膏的高性能化(强度等级达α40 以上),必须将磷石膏中可溶磷杂质含量严格控制在
0. 1%以内。本研究为磷石膏的高值化利用提供了关键的理论依据。

关键词: 磷石膏　可溶磷杂质　α-半水石膏　水化过程　微观结构　力学性能

Abstract: This study aims to clarify the influence mechanism of soluble phosphorus impurities on the preparation,hydration,
and properties of α-hemihydrate gypsum (α-HH),a key product for the high-value utilization of phosphogypsum. An integrated
process simulation strategy was adopted,where KH2PO4 was added to natural gypsum at different contents (0,0. 1%,
0. 3%,0. 6%) to simulate the soluble phosphorus impurities. Their effects throughout the autoclave preparation and subsequent
hydration processes were systematically investigated. The results indicated that soluble phosphorus impurities significantly altered
the crystal habit of α-HH,transforming its morphology from regular hexagonal prisms to short-prismatic,irregular rodlike,
and granular particles,accompanied by crystal refinement. Meanwhile,the impurities markedly accelerated the hydration
process,with the most pronounced accelerating effect observed at the content of 0. 3%,showing the shortest initial and final setting
time (3 min and 5 min,respectively) and the earliest hydration exothermic peak. However,this acceleration led to the deterioration
of the dihydrate gypsum crystal morphology in the hardened paste,evolving from dense,thick rods to loose,porous
fine rods,flakes,and irregular blocks,with weakened interlocking between crystals. Consequently,the macroscopic mechanical
properties were compromised:the absolute-dry compressive strength decreased continuously,and the 2 h flexural strength decreased
significantly after a slight increase at low impurity content. In summary,to achieve high-performance α-HH (meeting
strength grade α40 or above),the soluble phosphorus impurity content in phosphogypsum must be strictly controlled below
0. 1%. This research provides a crucial theoretical basis for the high-value utilization of phosphogypsum.

Key words: phosphogypsum,soluble phosphorus impurity,α-hemihydrate gypsum,hydration process,microstructure,mechanical
property

中图分类号:

张晓翔, 　刘冬梅, 　鲍　浩, 　陈柳灼, 　覃　意. 可溶磷在α-半水石膏制备及水化过程中的影响[J]. 金属矿山, 2026, 55(2): 306-312.

ZHANG Xiaoxiang, 　LIU Dongmei, 　BAO Hao, 　CHEN Liuzhuo, 　QIN Yi. Effect of Soluble Phosphorus in the Preparation and Hydration of α-Hemihydrate Gypsum[J]. Metal Mine, 2026, 55(2): 306-312.

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