John W. Burgman, Paul J. Sides
Forced-convection mass transfer at the metal/bath interface during aluminum reduction from cryolitic melts was studied under reproducible convective conditions. A film of molten aluminum on a rotating molybdenum cylinder served as the cathode. The concentration overpotential was measured as a function of rotation rate, current density, and bath composition, which allowed for the determination of concentration differences between the bulk and the metal surface. The concentration of aluminum fluoride was calculated as a basis for determining the mass transfer coefficient, using a specific weight percent formula. The study demonstrated that agreement with a correlation for mass transfer to a rotating cylinder enabled the calculation of effective diffusivities for aluminum fluoride species in alumina-saturated melts at various cryolite ratios. Specifically, diffusivity values obtained included 11.1 ± 1.1 x 10^-5 cm²/s at a cryolite ratio of 1.8, 11.4 ± 1.7 x 10^-5 cm²/s at 3.0 CR, and 4.4 ± 0.9 x 10^-5 cm²/s at 2.3 CR, among others. This research contributes to a better understanding of the electrochemical processes involved in aluminum production from cryolitic baths.
@article{699ccfae-dd17-470f-8365-0138b54694ad,
title={Electrochemical measurement of effective},
author={John W. Burgman and Paul J. Sides},
year={2026},
language={en}
}TY - JOUR TI - Electrochemical measurement of effective AU - John W. Burgman AU - Paul J. Sides PY - 2026 LA - en ER -
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