The Research on Wetting Behavior between Blast‐Furnace‐Type Slag and Carbon Materials

The wetting interactions between slag and carbonaceous materials are crucial for the permeability and fluidity in the blast furnace, thus affecting its efficient and stable operation. In this research, the effects of basicity, MgO, and FeO x contents on the wetting behavior of slags on graphite substrate, with MgO content specifically examined for the wetting behavior on coke substrate, are investigated. In the results, it is indicated that slag without FeO x does not undergo strong chemical reactions with the graphite substrate, resulting in bad wettability. The basicity and MgO in the slag have same effects on the surface tension of the slag. By controlling surface tension, the wetting properties at the slag–graphite interface can be altered. However, slag containing FeO x , due to its reduction reaction with the substrate, leads to the accumulation of Fe at the interface, which improves the properties at the slag–graphite interface and enhances wetting by slag. It is also observed that although slag exhibits bad wetting behavior on both graphite and coke surfaces, coke shows better wetting behavior than graphite. This is primarily because coke contains more ash components similar to slag, facilitating strong interaction between them. Moreover, coke has more pores, allowing slag to diffuse into the surface gaps within a certain range of surface tension, thereby improving wetting behavior.