In Situ Observation of the Dissolution of SiO2 Particles in CaO–Al2O3–SiO2 Slags and Mathematical Analysis of its Dissolution Pattern

• DOI: 10.1111/jace.12665
• Publication Date: 2013-12-07T07:06:41Z
• Authors: Stefan Feichtinger; Susanne K. Michelic; Youn‐Bae Kang; Christian Bernhard
• Keywords: Particle (ecology)

The dissolution of amorphous SiO 2 particles in CaO – Al O 3 slags was investigated at 1450°C by high‐temperature confocal scanning laser microscopy ( HT ‐ CSLM ) and thermodynamic/kinetic analyses. used this experimental study had a spherical form so that any rotation the particle did not cause errors determination size during dissolution. Moreover, wide composition range slag could be chosen without forming solid reaction layer which distort evaluation mechanism. evolution diameter measured image analysis pictures obtained from . It found curve (size as function time) exhibited either parabolic‐like or an S‐shaped depending on composition. patterns were compared with well‐known shrinking core model SCM ), it shown represent behavior observed study. experimentally shape curves varies for low ‐containing changed to S‐type increasing concentration slag. To elucidate mechanism, based approximations diffusion near proposed modifying previously available [M. J. Whelan, Met. Sci. J ., 3, 95–97 (1969)]. From data calculations, viscosity major factor affecting both rate Effective binary coefficients estimated using data. Those literature