Research on Solidification and Heat Transfer Characteristics of Molten Converter Slag in Air Quenching Granulation Process

The physical and mathematical model of molten converter slag particle has been established in this paper. The laws of solidification and heat transfer of molten converter slag particles with the diameter of 2 mm in the process of air quenching granulation at different air velocity have been simulated by FLUENT, which the conclusion is as follows: the transformation order of molten converter slag particles is upwind point → upper point and lower point → leeward point → center point. When the air velocity is 200 m/s and 1 m/s, the time of temperature maintaining phase transformation at the center point is about 0.5 s and 1 s, respectively. Under the conditions of forced cooling and natural cooling, the maximum value of internal temperature difference of converter slag particles is reached after 0.5 s and 2 s, respectively. When v = 200 m/s and v = 1 m/s, the internal maximum temperature differences of converter slag particles were 645 K and 162 K, respectively. Moreover, the maximum internal temperature point is deviated to the right with different cooling conditions. When the air velocity was 200 m/s and 1 m/s, the starting solidification time was 0.05 s and 0.35 s, respectively, and it severally took 0.55 s and 1.80 s to complete the solidification.