Preparation and Properties of Cemented Paste Backfill Material Containing Mining and Metallurgical Solid Waste
LI Xiaozhan1, ZHANG Hongze2, ZHANG Suhua3,4, LI Xin4, WANG Changlong4,*, CHEN Jingliang4, ZHAI Yuxin5, JING Jianlin4, MA Jintao4, PING Haoyan4, ZHENG Yongchao6
1 National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing, Beijing 100083, China 2 School of Earth Science and Surveying and Mapping, China University of Mining and Technology (Beijing), Beijing 100083, China 3 Handan Jianye Construction Engineering Quality Inspection Co., Ltd., Handan 056000, Hebei, China 4 School of Civil Engineering, Hebei University of Engineering, Handan 056038, Hebei, China 5 Technical Center, China Railway Construction Group Co., Ltd., Beijing 100040, China 6 State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China
Abstract: 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 [AlO4]5- and [SiO4]4- along the bridge oxygen in vanadium-titanium slag and steel.
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2023, Vol. 37 
