Experimental Investigation of Slag Particles of Ligament Mode Disintegration in Spinning Disk Atomizing

Abstract As the main by-product of steel production process, blast furnace slag is rich in high-temperature waste heat. Aiming at emission reduction and waste heat recovery, the dry granulation method by various atomizers appears to attract growing attention. However, the heat recovery efficiency is determined by the cooled slag particles with high quality. In this paper, the centrifugal granulation in spinning disk was performed experimentally. The slag particles size of ligament disintegration was studied using photos taken by means of high-speed camera. A mixture of rosin and paraffin with a mass ratio of 4:1 and two kinds of disks (flat disk and slotted disk) were discussed in the experiment. The results indicate that at a higher angular speed and slotted disk, smaller particles can be obtained easily. In general, the surface structure of disk not only has influence on particle average diameter but also gives consideration to mass fraction of particles. The results in this paper can be applicable for designing and optimizing the dry granulation method of spinning disk atomization.