Reactions Between Refractories and Molten Iron in Steelmaking Processes

摘要

The reactions between dense refractories and molten iron containing oxygen were examined by finger experiments as well as by X-ray sessile-drop method. The finger experiments with alumina revealed the formation of a FeAl_2O_4 layer, beyond which, non-wetting conditions prevailed. The corrosion was more significant when dispersed oxide layer was present. In the case of silica rod, the rod was deformed. In the experiments with mullite, the rods became extremely brittle. In contact angle measurements with alumina substrate, the time taken to reach the equilibrium value was a function of the oxygen partial pressure of the gas phase. After the attainment of the equilibrium, the drop was found to move due to imbalance in the forces acting on the drop. The magnitude of the force was roughly estimated. Contact angle measurements with silica substrate revealed the formation of a circular track along the periphery of the drop. This is attributed to the loss of SiO along this boundary and consequent increase in the corrosion of silica. Preliminary experiments with mullite substrates indicate that the behaviour is somewhat similar to that of alumina.