Heat Transfer and Metallurgical Reaction of Iron Ore Fines Injected into Raceway of a Small-scale Rot Furnace

Abstract

Influence of injected ore fines on the chemical and physical phenomena in and around the raceway was examined and the mechanism of silicon decrease in iron melt was experimentally investigated by using a small-scale hot furnace.
(1) The temperature in the raceway decreases with increasing the amount of injected ore fines mainly due to the endothermic reaction
(2) A part of injected ore fines remains inside of the raceway and shows high fractions of melting and reduction. Both fractions of sample increase with the increase of the injection rate, as the proportion of remaining ore also increases.
(3) SiO content in the gas and Si content in the metal in the dripping region above the raceway decrease with increasing the injection rate, since SiO gas generated in the raceway can be absorbed by injected iron ore at the molten state.
(4) Decrease of Si content in the metal by the reaction with FeO in slag formed by injected ore is negligibly small in the dripping region below the raceway.