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2 Polish Journal of Chemistry

2 2000

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Mechanism and Kinetics of the Anodic Reaction in Cryolite Melts : I. The Influence of CaF2 (5 wt%) at Different Al2O3 Content

Kisza A., Thonstad J., Hives J.

Polish Journal of Chemistry

2000

Vol. 74, nr 4

549-558

Calcium fluoride is one of the two main components of the cryolite-based electrolyte in aluminium electrolysis. By Electrochamical Impedance Spectroscopy (EIS) the influence of CaF2 upon the kinetics and mechanism of the anodic reaction in 4 cryolite-alumina melts containing 2,4,6 and 8 wt% of alumina. The diddusion coefficient of the Al2OF2- anionic species decreases as a function of the alumina content, due to the increase of the melts viscosity.

Mechanism and Kinetics of the Anodic Reaction in Cryolite Melts : II. The Influence of AIF3(11 wt%) at Different Al2O3 Content

Kisza A., Thonstad J., Hives J.

Polish Journal of Chemistry

2000

Vol. 74, nr 7

1003-1010

Aluminium trifluoride is the main additive to the cryolite-based electrolyte in aluminium electrolysis. By Electrochemical Impedance Spectroscopy (EIS) the influence of AlF3 upon the kinetics and mechanism of the anodic reaction in 4 cryolite-alumina melts containing 2,4,6 and 8wt% of alumina and 11 wt% of AlF3 was determined at 1000 C.