A theoretic analysis is performed with temperature model on transient air cooling and solidification behaviors of a spherical molten slag particle. With considering the variation of thermal conductivity with temperature and the radiation between slag and environment

the temperature distribution and the transient moving of phase-change interface inside the particle are obtained by applying the finite difference method. The effects of variable thermal conductivity

heat transfer boundary condition

slag particle size

air flow rate and initial temperature of the slag particle are discussed. The simulation results indicate that the variable thermal conductivity of the slag extends the solidification process

while the radiation significantly improves the cooling speed. Meanwhile

the solidification process is speeded up with increasing air flow rate and decreasing particle size. The cooling and solidification process is prolonged for the slag particle with higher initial temperature.