Investigations of Calcium Aluminate Slag Penetration to MgO Monolithic Refractories in Steelmaking Process

In this study, slag penetration into a magnesia refractory monolithic was investigated by the crucible test method. A synthetic calcium aluminate slag system has been used to study commercial magnesia mix refractory for ۱, ۲, ۳, ۴, ۵ and ۶ hours at ۱۴۵۰°C and ۱۶۰۰°C. It has been shown that the penetration rate is controlled by a diffusion mechanism at ۱۴۵۰°C. In this case, capillaries are the main channels of initial slag penetration into the refractory. In the penetration process of the slag system, calcium silicate was formed on the surfaces of MgO grains at ۱۴۵۰°C and around them by reaction between grain boundary and mayenite, as a main phase of slag with a low melting point. Dissolution of the refractory components in the slag could be supported by the penetration process at ۱۶۰۰°C. In this case, dissolution of the refractory components in the slag not only makes new open channels, but also changes the local slag composition, resulting in an increase in surface tension and viscosity of the slag.

کلیدواژه ها:

Slag ، Magnesia ، Calcium aluminate slag ، Crucible test method ، Corrosion