可溶性氟对α-半水石膏力学性能的影响机理
Mechanism of Influence of Soluble Fluorine on Mechanical Properties of α-Hemihydrous Gypsum
王禄嵩 1李显波 2杜伟凡 1高文鑫1
作者信息
- 1. 贵州大学矿业学院,贵州 贵阳 550025
- 2. 贵州大学矿业学院,贵州 贵阳 550025;喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州 贵阳 550025;贵州省非金属矿产资源综合利用重点实验室,贵州 贵阳 550025
- 折叠
摘要
这是一篇矿物材料领域的论文.采用磷石膏代替天然石膏制备α-半水石膏胶凝材料是其高附加值利用的重要途径,但磷石膏中的可溶性氟杂质会对α-半水石膏产生不利影响.论文研究了可溶性氟对α-半水石膏凝结时间和硬化体强度的影响规律,并采用XRD、XPS、SEM-EDS等手段探究其影响机理.结果表明:可溶性氟会缩短α-半水石膏的初凝时间和终凝时间,使其发生促凝;硬化体显微结构分析表明,可溶性氟会使二水石膏颗粒粗化,内部孔隙增多,导致其力学强度降低;XRD和XPS分析表明,可溶性氟会与α-半水石膏溶解产生的Ca2+反应生成溶度积更小的氟化钙,从而缩短α-半水石膏的凝结时间.
Abstract
This is an article in the field of mineral materials.The preparation of α-hemihydrate gypsum from phosphogypsum instead of natural gypsum is an important way of its high value-added utilization.However,soluble fluorine impurities in phosphogypsum will have adverse effects on α-hemihydrate gypsum.In this article,the effect of soluble fluorine on the setting time and the strength of the hardened body of α-hemihydrate gypsum was studied,and its mechanism was explored by XRD,SEM-EDS and XPS.The results show that soluble fluorine can shorten the setting time and decrease the mechanical strength of α-hemihydrate gypsum.The microstructure analysis of hardened body shows that soluble fluorine can coarsen the particles of gypsum dihydrate,increase the internal pores,and reduce the mechanical strength.XRD and XPS analysis show that soluble fluorine reacts with Ca2+generated by the dissolution of α-hemihydrate gypsum to form calcium fluoride with smaller solubility product,thus shortening the setting time of α-hemihydrate gypsum.
关键词
矿物材料/α-半水石膏/可溶性氟/力学强度/凝结时间/影响机理Key words
Mineral materials/α-hemihydrate gypsum/Soluble fluorine/Mechanical strength/Setting time/Influence mechanism引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据