Abstract
The dissolution mechanism of Al2O3 inclusions in molten slags was explored by in-situ single hot thermocouple technique combined with X-ray photoelectron spectroscopy. Result shows that it takes 2940 s to completely dissolve Al2O3 inclusions in the molten F-bearing mold flux, which is mainly controlled by boundary layer diffusion. Because the connected [AlO6] octahedra in the Al2O3 inclusion is gradually destroyed by the O2− ions in the melt. By comparison, the CaO–SiO2–B2O3 based F-free mold flux only takes 840 s to completely dissolve Al2O3 inclusions. Because the [AlO6] octahedra is destroyed and further transformed to [AlO4] tetrahedra and produce O2− ions, which greatly facilitates the dissociation of the Al2O3 particle. However, the formed [AlO4] tetrahedra will promote the precipitation of the dense 2CaO·SiO2·Al2O3 crystals, which tightly encases the Al2O3 particle and causes significant drop in the dissolution rate. Thus, the dissolution rate is controlled by chemical reaction and then by boundary layer diffusion.
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