摘要
为了促进磷石膏资源化利用,以磷石膏、无水石膏、钢渣和P·Ⅱ52.5水泥为原材料,通过复配方法制备磷石膏复合(PSGW)胶凝材料并对其水化胶结过程进行研究。结果表明,当磷石膏质量分数为35%、无水石膏质量分数为5%、钢渣质量分数为10%、P·Ⅱ52.5水泥质量分数为50%时,制备出的PSGW胶凝材料3 d抗折强度为4.9 MPa、抗压强度为35.3 MPa;28 d抗折强度为6.9 MPa、抗压强度为51.5 MPa、软化系数为0.88,满足P·O42.5 R等级要求。通过对PSGW胶凝材料进行XRD、FT-IR和SEM表征分析发现,该体系水化产物主要为棒状钙矾石、板块状水化硅酸钙、氢氧化钙和重结晶的二水硫酸钙。
In order to promote the utilization of phosphogypsum,phosphogypsum composite cementing material( PGSM) is prepared through complex formulation method using phosphogypsum,anhydrous gypsum,steel slag and P·Ⅱ52. 5 cement as raw materials,and its hydration and cementitious process is studied. Experimental results show that PSGW cementing material is prepared reasonably when the contents of phosphogypsum,anhydrous gypsum,steel slag and P·Ⅱ 52. 5 cement is 35%,5%,10% and 50%,respectively. The flexural strength and compressive strength of the material in 3 d is 4. 87 MPa and 35. 26 MPa,respectively,and the flexural strength and compressive strength in 28 d is6. 92 MPa and 51. 51 MPa,respectively,and its softening coefficient is 0. 88,which meet the requirement of P·O 42. 5 R grade.Through the characterization of PSGW cementing materials by XRD,FT-IR and SEM,the hydration products of the system include mainly clonite ettringite,plate hydrated calcium silicate,calcium hydroxide and recrystallized calcium sulfate dihydrate.
作者
魏兴
郑光亚
何宣志
张志远
张云开
夏举佩
WEI Xing;ZHENG Guang-ya;HE Xuan-zhi;ZHANG ZHi-yuan;ZHANG Yun-kai;XIA Ju-pei(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming 650500,China;The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province,Kunming 650500,China)
出处
《现代化工》
CAS
CSCD
北大核心
2021年第9期101-106,共6页
Modern Chemical Industry
基金
国家自然科学基金项目(21566018)。
关键词
磷石膏
胶凝材料
软化系数
水化机理
phosphogypsum
cementing material
softening coefficient
hydration mechanism
