Study on a Lime-Fluorite Slag Melting Agent for Ladle Slag Buildup

Abstract

The Al2O3-MgO-Cr2O3 brick, which is used for wear lining in the ladle slag line, was selected, and the static crucible method was applied to perform a slag sticking test with the refining slag and then investigate the effect of the lime-fluorite slag melting agent with different recipes. The slag corrosion and penetration rate of samples were measured, and the microscopic structure was analyzed through a scanning electron microscope (SEM), the possible slag melting effect and the proportion of active lime and fluorite were discussed. The results show that, with an increase of CaF2 in the slag melting agent, the corrosion and penetration rate rise as well, and a corrosion ring in the sample was observed while the content of CaF2 reached the certain value. The high melting point phases including MA, CA2, CA6, C3T2 and the low melting point phases including C2AS, CAS2, CA were distributed discontinuously. Suitable slag melting agents could reduce the viscosity of the slag, form the discontinuous high melting phases and corrosion ring, so as to achieve the purpose of slag melting for ladle lining.