Investigation of Carburization and Melting Behavior of Fully Reduced LRI and IOS on Coke Substrates

초록

In the course of developing hydrogen-enriched blast furnace ironmaking operation, the carburization and melting behavior of the fully reduced low-reduced iron (LRI) and the iron ore sinter (IOS) on the coke substrate were investigated at 1773 and 1823 K under 40%CO-40%N2-20%H2 gas atmosphere. The LRI sample was not carburized at 1773 K due to the inhibition ash layer on the coke surface; consequently, it was not melted. Although the reduced iron of the LRI sample was melted at 1823 K, it was not carburized due to the prevention of the ash layer. On the other hand, the IOS sample was carburized to be melted at 1773 and 1823 K. The self-fluxing slag cleaned the ash layer on the coke surface, enabling the carburization and melting of the reduced iron. It is concluded that the liquid slag formation accelerated the carburization of the reduced iron, whereas the liquid metal formation did not increase the carburization rate. Due to the difficulty in carburization and melting of LRI, the use of LRI in the hydrogen-enriched blast furnace operation can be limited.

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