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>Simulation for Dripping Behavior of Primary Melt Formed During the Reduction of Iron Ore Sinter in the Blast Furnace
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Simulation for Dripping Behavior of Primary Melt Formed During the Reduction of Iron Ore Sinter in the Blast Furnace
Alumina content in the iron ore imported to Japan is increasing year by year and some problems for the blast furnace operation due to the use of the high alumina containing sinter are reported. In order to clarify the mechanism of harmful effect of alumina on the blast furnace operation, the behavior of primary melt, which is formed in the sinter at the cohesive zone of the blast furnace has been simulated by dripping molten slag through iron or oxide funnel. The effects of basicity, Al_2O_3 and Fe_tO contents in the five kinds of slags on the dripping temperature and hold-up on the funnel have been discussed. It was found that the eutectic melt formed in the sinter would play important role for the dripping behavior of slag melt in the blast furnace or hold-up phenomenon of slag melt among fine pore in reduced iron and ore particle. Al_2O_3 increases the hold-up degree of the slag melt on the funnel and its effect becomes much significant in the acidic slag. It was estimated that the increase of the slag hold-up by Al_2O_3 in the ore could result in the harmful effect on the permeability resistance and indirect reduction rate of the sinter in the blast furnace.
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