Wetting and corrosion behavior between magnesia–carbon refractory and converter slags with different MgO contents

The influence of MgO content in slag on wetting and corrosion behavior between slag and MgO–C refractory was investigated. It can be known from the high-temperature wetting experiment that as the MgO content in the slag increases, the final contact angle between the slag and the MgO–C refractory gradually increases and the penetration depth of the slag into the refractory gradually decreases from 60.54 μm (when the MgO content is 8%) to 28.11 μm (when the MgO content is 12%). The CaO and SiO₂ in the slag penetrate into the MgO–C refractory along the pores or surface cracks formed by carbon oxidation and react with MgO to generate a large amount of low-melting compound CaO–MgO–SiO₂, which accelerates the corrosion of the refractory. As the MgO content in slag increases, the viscosity of the slag increases and the fluidity becomes worse, so that the mass transfer and diffusion of molecules or ions in the slag are weakened. In addition, the increase in MgO reduces the activity of FeO in the slag, which inhibits the interfacial chemical reaction, thereby weakening the wetting effect caused by the reaction.