钒钛磁铁矿尾矿/粉煤灰漂珠砂浆EPS复合材料的制备与性能研究OA

At present,the massive amount of tailings generated by the large-scale mining of vanadium-titanium-magnetite in China poses a serious threat to the ecological environment.In addition,polystyrene foam insulation materials have poor flame retardancy,which limits their application and development.Therefore,vanadium titanium magnetite,cement and polystyrene foam are used as the main raw materials,and fly ash floating beads are selected to replace some tailings to prepare composite materials with high strength and good thermal insulation performance.The results show that when the bulk density is 600 g/L and the proportion of fly ash floating beads replacing vanadium-titanium-magnetite tailings fine sand is 30%,the thermal conductivity of the composite material is 0.34 W/(m·K),and the composite material has good mechanical properties.The flexural strength and compressive strength after 7 d of curing are 1.05 MPa and 2.50 MPa,respectively,and the flexural strength and compressive strength after 28 d of curing are 1.03 MPa and 2.52 MPa,respectively.The addition of fly ash floating beads do not affect the hydration reaction of cement,and no new hydration products are produced.