Abstract：To investigate the effect of actual air quenching parameter on the solidification heat exchange process inside the slag beads, the internal temperature distribution and solid-liquid phase transition law of the slag beads were studied under different air velocities and slag drops sizes when slag beads fell intothe slag cooler, and the influence of different air quenching parameters on heat exchange characteristics of air quenching blast furnace slag(BFS) in cooling process was obtained. The results show that air quenching of BFS can accelerate the solidification of slag bead surface to form the solid slag shell, but the whole solidification process is not uniform. With the increase of air velocity, the solidification of slag beads is accelerated, and the slag shell formation time is shortened. The smaller the slag beads diameter is, the faster the heat exchange rate of slag beads is, and the shorter the complete solidification time is. When the slag temperature, the air velocity and the diameter of slag beads are 1 723 K, 350 m/s and 3 mm, respectively, the fastest solidification rate is obtained, forming a complete slag shell, and saving energy consumption.
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2022, Vol. 32 
