7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

A physical model of blast furnace slag granulation using rotating disk method is developed, based upon similarity criteria namely solidification similarity, geometric similarity and dynamic similarity. For dynamic similarity ratio of inertial, viscous and surface tension forces between the model and prototype are considered. Based upon dynamic similarity, equality of Ohnesorge number, Reynolds number and Weber numbers are determined by proper selection of liquid metal for cold model experiments as well as design and operating parameters. Cold model experiments using rosin and paraffin wax in the ratio of 4:1 were used. A strategy has been developed for predicting appropriate operating parameters for actual pilot plant experiments in a reasonable way to achieve the desired size of slag granules. The mass accumulation on the disk decreases with increase in the temperature however, the decrease was found much in case of smaller diameter disc. Higher temperature and rotating speed led to formation of finer particles.