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Nature of MgO and Al2O3 Dissolution in Metallurgical Slags
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Nature of MgO and Al2O3 Dissolution in Metallurgical Slags
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Journal Article
Nature of MgO and Al2O3 Dissolution in Metallurgical Slags
2015
Overview
The nature of MgO and Al
2
O
3
dissolution in metallurgical slags may affect production cost, efficiency, and product quality. However, the rate-limiting dissolution mechanism, chemical reaction or boundary layer diffusion, is not well understood. In the present report, the dissolution mechanism of MgO and Al
2
O
3
in metallurgical slag was evaluated based on available literature data. The mass balance between the dissolving particle and the flux equation through the boundary layer was applied to predict the dissolution curve. The influence of fluid flow was taken into account to calculate the mass transfer rate at the oxide/slag interface. It was found that the rate-limiting step of MgO and Al
2
O
3
dissolution is the same: mass transfer through the boundary layer. Depending on the slag composition and experimental temperature, the effective diffusion coefficient for MgO and Al
2
O
3
dissolution falls in the range of 10
−12
to 10
−9
m
2
/s.
Publisher
Springer US
