Iron & Steel Society of Iran International Journal of Iron & Steel Society of Iran 2981-0388 3 2 2006 12 01 Investigations of Calcium Aluminate Slag Penetration to MgO Monolithic Refractories in Steelmaking Process Investigations of Calcium Aluminate Slag Penetration to MgO Monolithic Refractories in Steelmaking Process 34 42 4819 EN M. H. Amin Material and Energy Research Center, P.O. Box 14155-4777 Tehran, Iran A. Kazemzadeh Material and Energy Research Center, P.O. Box 14155-4777 Tehran, Iran B. Arfaei Department of Mechanical Engineering, State University of New York, USA N. Saha-Chaudhury School of Materials Science and Engineering, UNSW, Sydney, Australia V. Sahajwalla School of Materials Science and Engineering, UNSW, Sydney, Australia Journal Article 2014 03 04 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 1, 2, 3, 4, 5 and 6 hours at 1450°C and 1600°C. It has been shown that the penetration rate is controlled by a diffusion mechanism at 1450°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 1450°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 1600°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. https://journal.issiran.com/article_4819_30d454f09b771b9f65e3eaf6e00fa7bd.pdf