This figure indicates that the major precipitated phase is melilitite. In addition, spinel, perovskite, and olivine are observed.
The crystallization temperatures of melilitite, perovskite, and olivine exhibit a rising trend, particularly that of perovskite.
According to the thermodynamic calculation, it can be found that the major precipitated phase is melilitite during the cooling crystallization process of the CaO-Si[O.sub.2]-[Al.sub.2][O.sub.3]-MgO-Ti[O.sub.2] slag system.
The major phase precipitated during the slag cooling process is melilitite. Spinel, perovskite, and olivine are also observed.