Research on the Wetting and Corrosion Behavior Between Converter Slag with Different Alkalinity and MgO-C Refractories

The wetting and corrosion behavior of slag with different alkalinity and MgO-C refractories were studied through high-temperature wetting experiments. The results showed that as the alkalinity of the slag increased, the final contact angle between the slag and the MgO-C refractory gradually decreased, and the penetration depth of the slag into the refractory gradually decreased. The CaO and SiO2 in the slag penetrated into the MgO-C refractory along the pores or surface cracks formed by carbon oxidation, and reacted with MgO to generate a large amount of low-melting compound (CaO-MgO-SiO2), which accelerated the corrosion of the refractory. As the alkalinity increased, the content of CaO in the slag increased, the viscosity of the slag increased and the fluidity became worse, so the mass transfer and diffusion of molecules or ions in the slag were weakened. In addition, the increase of CaO content reduced the activity of FeO in the slag, which inhibited the interfacial chemical reaction, thereby weakening the wetting effect caused by the reaction.