摘要
以钢渣、钒钛矿渣为主要原料制备胶结剂,再将其与钒钛铁尾矿制成矿井充填料,通过力学性能、XRD、SEM、FTIR等测试,研究了胶结充填料的性能及胶结剂水化产物的组成和结构。结果表明:当钢渣、钒钛矿渣的质量比为13∶12,胶结剂中钢渣/钒钛矿渣、磷石膏、双氰胺废渣、复合磷酸、水泥熟料的质量比为84∶3.6∶5.4∶4.2∶2.8,充填料胶砂比为1∶4,料浆浓度为80%,减水剂含量为0.178%时,充填料坍落度为214 mm,充填料28 d抗折和抗压强度分别达到4.04 MPa、8.31 MPa,满足GB/T 39489-2020《全尾砂膏体充填技术规范》要求。XRD和SEM分析表明,胶结剂水化产物主要为钙矾石(AFt),磷石膏的存在促进了AFt的形成,而AFt又进一步促进了钒钛矿渣和钢渣中[AlO_(4)]5-和[SiO_(4)]4-沿桥氧的断裂。
Steel slag and vanadium-titanium slag were used as the main raw materials to prepare cementing agent,and then mine cemented paste backfill material was prepared by cementing agent and vanadium-titanium iron ore tailings.The properties of cemented paste backfill material,and the composition and structure of hydration products in the cementing agent were investigated by means of mechanical properties,X-ray diffraction(XRD),scanning electronic microscopy(SEM),fourier transform-infrared spectroscopy(FTIR).The results showed that when the mass percentage of steel slag and vanadium-titanium slag was 13∶12,and the mass ratio of steel slag/vanadium titanium slag,phosphogypsum,dicyandiamide waste slag,composite phosphoric acid,and cement clinker in the cementing agent was 84∶3.6∶5.4∶4.2∶2.8,the binder to sand ratio of cemented paste backfill material was 1∶4,the slurry concentration was 80%,and the dosage of water reducing agent was 0.178%,the slump was 214 mm,and the 28-day flexural strength and 28-day compressive strength of cemented paste backfill material reached 4.04 MPa and 8.31 MPa respectively,which meet the requirements of GB/T 39489-2020 Technical Specification for the Total Tailing Paste backfill.XRD and SEM analysis show that the hydration product in the cementing agent is mainly ettringite(AFt).The existence of phosphogypsum promotes the formation of AFt,and AFt further promotes the fracture of[AlO_(4)]5-and[SiO_(4)]4-along the bridge oxygen in vanadium-titanium slag and steel.
作者
李小占
张鸿泽
张苏花
李鑫
王长龙
陈敬亮
翟玉新
荊牮霖
马锦涛
平浩岩
郑永超
LI Xiaozhan;ZHANG Hongze;ZHANG Suhua;LI Xin;WANG Changlong;CHEN Jingliang;ZHAI Yuxin;JING Jianlin;MA Jintao;PING Haoyan;ZHENG Yongchao(National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing,University of Science and Technology Beijing,Beijing 100083,China;School of Earth Science and Surveying and Mapping,China University of Mining and Technology(Beijing),Beijing 100083,China;Handan Jianye Construction Engineering Quality Inspection Co.,Ltd.,Handan 056000,Hebei,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,Hebei,China;Technical Center,China Railway Construction Group Co.,Ltd.,Beijing 100040,China;State Key Laboratory of Solid Waste Reuse for Building Materials,Beijing Building Materials Academy of Science Research,Beijing 100041,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2023年第8期66-71,共6页
Materials Reports
基金
国家重点研发计划(2021YFC1910605)
河北省自然科学基金(E2020402079)
河北省科技重大专项项目(21283804Z)
固废资源化利用与节能国家重点实验室开放基金(SWR-2023-007)
中铁建设集团有限公司科技研发计划(22-14b,22-11b)
邯郸市科学技术研究与发展计划项目(21422111260)。
关键词
钢渣
钒钛矿渣
胶结剂
充填料
钙矾石
steel slag
vanadium-titanium slag
cementing agent
cemented paste backfill material
ettringite
