Sulfide Capacities of Solid Oxides in Calcium-Aluminate Systems

Abstract

To clarify the mechanism of CaS formation on the oxide inclusion of the CaO–Al₂O₃ system, the sulfide capacities of solid oxides was measured in the present study. The results show that the sulfide capacity of (12CaO·7Al₂O₃; C₁₂A₇) was much larger than of other compounds, and increased with temperature. The value for C₁₂A₇ was larger than that measured for the liquid oxide of the same composition. Furthermore, the diffusion behavior of sulfur in solid steel to the inclusion of the CaO–Al₂O₃ system, was investigated using a diffusion couple. After heating at 1473 K for 72 h, in the case of C₁₂A₇, the intensity of sulfur in the oxide was high, but the formation of CaS was not detected. This suggests that the formation of CaS was suppressed around the C₁₂A₇ particles by the diffusion of sulfur in the solid oxide.