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When liquid steel slag produced from steelmaking process was treated into the post-cold slag by conventional methods,the great deal of slag heat was dissipated into the environment,causing a lot of energy waste and environmental pollution.In this study,a novel approach of direct utilization of hot steel slag as a raw material and slag heat for the production of glass-ceramics was proposed and experimentally tested.In order to simulate liquid slag from steelmaking electric furnace,40%water-quenched slag was remelted at 1 450℃and then mixed with 60%melting additives(silica powder,alumina powder and sodium oxide, etc.)and subsequently melted together at 1 500℃for 1 h into modified liquid slag which was cast,heat-treated, annealed and transformed into glass-ceramics.The heat-treated glass samples were investigated using differential thermal analysis(DTA),X-ray diffraction(XRD),and scanning electron microscopy(SEM). The results show that dominant crystalline phase is diopside[CaFe(SiO_3)_2]and the shape of the crystal is like the granule,diameter is about 0.2 -0.6μm.A glass-ceramic with nucleation temperature of 695℃for two hours and crystallization temperature of 893℃for one hour and 1 163℃for half-hour exhibited the best combination of properties.This method of slag mixed with melting additives to adjust the composition of the parent glass is important for the industrial production of glass-ceramics by direct utilization of hot steel slag.
When liquid steel slag produced from steelmaking process was treated into the post-cold slag by conventional methods, the great deal of slag heat was dissipated into the environment, causing a lot of energy waste and environmental pollution. In this study, a novel approach of direct utilization of hot steel slag as a raw material and slag heat for the production of glass-ceramics was proposed and experimentally tested. In order to simulate liquid slag from steelmaking electric furnace, 40% water-quenched slag was remelted at 1 450 ℃ and then mixed with 60% melting additives (silica powder, alumina powder and sodium oxide, etc.) and subsequently melted together at 1 500 ℃ for 1 h into modified liquid slag which was cast, heat-treated, annealed and transformed into glass-ceramics The heat-treated glass samples were investigated using differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results show that the dominant crystalline phase is diopside [CaFe ) _2] and the shape of the crystal is like the granule, diameter is about 0.2 -0.6 μm. A glass-ceramic with nucleation temperature of 695 ° C for two hours and crystallization temperature of 893 ° C for one hour and 1 163 ° C for half -hour exhibited the best combination of properties. This method of slag mixed with melting additives to adjust the composition of the parent glass is important for the industrial production of glass-ceramics by direct utilization of hot steel slag.