Solidification and heat transfer of molten steel slag particles during air quenching process

In order to effectively utilize the resources and energy of molten steel slag, the variation of precipitation phase and specific heat of air quenched steel slag (AQSS) particles during continuous cooling process was investigated by FactSage and thermogravimetry differential scanning calorimetry. The cooling and solidification process of molten AQSS particles was simulated by Fluent. The microstructure changes in AQSS particles in solidification process were analyzed using an ultra-high temperature laser confocal microscope and a scanning electron microscope. The results indicated that in the cooling process of molten AQSS particles, the precipitation of Ca2Fe2O5 resulted in the largest change of specific heat. Under the condition of slow cooling, the cooling rate is more obviously affected by specific heat. When the initial air velocity was 300 m s(-1), there was the highest temperature difference in AQSS particles during cooling process. What is more, the compactness of the boundary region of AQSS particles was obviously better than that of its central region.