Hot Slag Modification with Mechanical Stirring: Motion and Dispersion Characteristic of Modifier Particle

To improve the modification efficiency and effect of hot slag with mechanical stirring, the motion and dispersion characteristic of modifier particles with stirring time are investigated by numerical simulation, and the entrainment mechanism of particle with mechanical stirring was discussed. In addition, a quantitative index of particle dispersion characteristic suitable for discrete particle simulation is proposed and the effects of stirring speed and impeller structure on the dispersion of modifier particle were also elucidated. The results show that four circulation streams on each side of cross-shaped impeller which are beneficial to complete mixing between modifier particles and hot slag. The dispersion of modifier particles depends on the axial circulation velocity and turbulent kinetic energy of hot slag surface. A dynamic steady state of particle motion in each region can be obtained within 8 s by mechanical stirring. The stirring speed of 60 rpm by cross-shaped impeller are more conducive to hot slag modification.