Dissolution Behaviors of FeO-MgO Solid Solutions in Molten Slag

HUANG Fuxiang, MARUOKA Nobuhiro, KITAMURA Shin-ya

doi:10.60431/taikabutsu.68.4_165

Studying the dissolution mechanism of MgO in steelmaking slag is vital to reduce refractory damage in basic oxygen furnaces. In many cases, a FeO-MgO layer is formed at the interface between MgO and steelmaking slag. In this research, the dissolution rates of the FeO-MgO solid solution in molten slag were investigated by changing the composition of solid solution and slag. The following results were obtained. （1）the FeO-MgO solid solution was not stable and dissolved into slag. The dissolution rate increased with increasing FeO content in the slag, and decreased with increasing MgO content in the slag. （2）In every case, the FeO content of the solid solution near the interface of slag was higher than that in bulk. （3）A clear relation was found between FeO content in the solid solution near the interface and the dissolution rate. The FeO content in the solid solution near the interface can be considered an important factor that controls the dissolution rate. （4）A fairly good relationship was found between the FeO activity difference between the solid solution near the interface and slag bulk and the differences in FeO content between the solid solution near the interface and slag bulk．

Dissolution Behaviors of FeO-MgO Solid Solutions in Molten Slag

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