|Cite this article as:|
|Changyu Ren, Caide Huang, Lifeng Zhang, and Ying Ren, In-situ observation of the kinetic dissolution of Al2O3 particles in CaO-Al2O3-SiO2 slags using laser confocal scanning microscopy, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2347-6|
The dissolution kinetics of Al2O3 in CaO-Al2O3-SiO2 slags was studied using high-temperature confocal scanning laser microscope at 1773 to 1873 K. The results show that the controlling step during the Al2O3 dissolution was diffusion in the molten slag. It was found that dissolution curves of Al2O3 particles was hardly agreed with the traditional boundary layer diffusion model with the increase of the CaO/Al2O3 of slag. A modified diffusion equation considering slag viscosity was developed to study the dissolution mechanism of Al2O3 in slag. Diffusion coefficients of Al2O3 in slag were calculated as 2.8 ×10-10 to 4.1 ×10-10 m2/s. The dissolution rate of Al2O3 increased with higher temperature, CaO/Al2O3, and particle size. A new model was shown to be vAl2O3 = 0.16 × R01.58 × x3.52 × (T-Tmp)1.11 to predict the dissolution rate and the total dissolution time of Al2O3 inclusions with various sizes.