Abstract: In view of the influence of many factors such as wind speed and granulation chamber layout, the two processes of the steel-slag air quenching process including liquid steel-slag being impacted by high-speed airflow and liquid steel-slag particles convective cooling and solidification were discussed，and the mathematical model of steel-slag air quenching and the multiphase flow equation considering turbulent shear stress transfer was established. Based on the finite element analysis method and substituting the physical parameters of the actual steel-slag sample, a finite element model of the air quenching process was established. Finally, through the numerical simulation of the liquid steel-slag air quenching process, the heat exchange and solidification laws of the steel-slag particles under different particle sizes and wind speeds were obtained, and the parameters of the granulation chamber process layout were verified. Numerical simulation results considering the latent heat of phase change of steel-slag and air resistance during solidification show that if the wind speed of the incident airflow is 100 m/s, the surface layer of slag particles less than or equal to 3 mm can be solidified within 3 s, and the slag particles mainly fall within the range of 20-35 m, which meets the process conditions of the granulation chamber.

Key words: steel-slag air quenching, numerical simulation, granulation heat transfer law, granulation chamber, steel-slag grain size