Phase field simulation study of the dissolution behavior of Al2O3 into CaO–Al2O3–SiO2 slags.

A quantitative phase-field model has been implemented to study the dissolution behavior of alumina (Al 2 O 3 ) into CaO–Al 2 O 3 –SiO 2 slags. The simulations allowed evaluating the influence of temperature and composition on the diffusion paths and dissolution rates of Al 2 O 3 into CaO–Al 2 O 3 –SiO 2 slags. The results obtained in the simulations are consistent with experimental observations and the predictions from an analytical dissolution model. The phase field simulations show that the dissolution rate of Al 2 O 3 increases with temperature. Increasing CaO at a fixed Al 2 O 3 content or decreasing Al 2 O 3 content at a fixed CaO/SiO 2 ratio also results in a higher dissolution rate of Al 2 O 3 . The results are further interpreted based on thermodynamic and kinetic considerations. [ABSTRACT FROM AUTHOR]