Abstract：In the process of centrifugal granulation of molten blast furnace slag based on spinning cups,under the centrifugal force exerted by the spinning cup,the molten slag deforms into a liquid film on the inner wall surfaces of the cup. The thickness of the slag film at the edge of the spinning cup will directly dominate the size of the granulated solid slag particles formed from the breakup and cooling of the liquid slag after leaving the spinning cup. Therefore,in order to explore influences of relevant parameters on the slag film thickness at the edge of the spinning cup and the quantitative relationship between the slag film thickness and the average diameter of the slag particles,a CFD numerical model for multiphase flow with free surface was used to simulate the flow behavior of the liquid blast furnace slag on spinning cups,and,especially, the roles of key parameters affecting the slag film thickness were analyzed. The results show that cup spinning speed and slag flowrate have the most significant influences, which are the important operating parameters of the centrifugal granulation technology, and the mean diameter of slag particles increases nearly linearly with the increase of the film thickness.
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2020, Vol. 55 
