On Hydrodynamics of Dry Slag Granulation of LD/BOF Slag: Developments for New Liquid

Experimental trials of dry granulation process have been widely performed to granulate the blast furnace (BF) slag, in addition to, heat recovery from the molten material. In this study, a development of technology for dry granulation of LD slag under research has been discussed, using experimental methodology. The first two stages of experimental setup, with water as the working fluid, have been discussed in brief and their limitations have been noted. Then, the modifications that were performed in the third stage experimental setup, have been discussed in detail. The working liquid, which was water for the first two stages of experimental study, has also been changed to a more viscous liquid, so as to mimic the properties of slag as close as possible. Further, the possibility of using air blast has also been tested to assist in atomization, and hence, granulation, and was observed to be effective. However, due to some design flaws, that have been discussed in detail, a novel design for air blast method has been achieved and a successful trial has been performed. The photographs of the trial have been shown. This paper is compiled to state the updates in the development of technology of LD slag granulation and to show the trial as a proof of the direction of work being right.