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Ca^(2+)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。
This is an article in the field of mineral materials.The preparation ofα-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 onα-hemihydrate gypsum.In this article,the effect of soluble fluorine on the setting time and the strength of the hardened body ofα-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 ofα-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 Ca^(2+)generated by the dissolution ofα-hemihydrate gypsum to form calcium fluoride with smaller solubility product,thus shortening the setting time ofα-hemihydrate gypsum.
作者
王禄嵩
李显波
杜伟凡
高文鑫
WANG Lusong;LI Xianbo;DU Weifan;GAO Wenxin(Mining College,Guizhou University,Guiyang 550025,Guizhou,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guizhou University,Guiyang 550025,Guizhou,China;Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《矿产综合利用》
CAS
2024年第6期153-160,共8页
Multipurpose Utilization of Mineral Resources
基金
贵州省科技计划项目(黔科合基础-ZK[2022]一般070)
贵州省教育厅青年科技人才成长项目(黔教合KY字[2021]099)
贵州大学引进人才科研项目(贵大人基合字(2019)41号)。
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
Mineral materials
α-hemihydrate gypsum
Soluble fluorine
Mechanical strength
Setting time
Influence mechanism
