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Oxy fluoro aluminate complexes in molten

S. K. Ratkje

2026enmolten saltscryolitealuminium electrolysisoxyfluoroaluminatescomplexesthermodynamics

Abstract

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Cryoscopic measurements on the KF rich side in the reciprocal salt system KF-AlF3-KlO-Al2Os are presented. The amounts of K, AlF3, and K2O added to KF are so small that ideal Henrian behaviour of the solution can be expected. The results indicate complex formations with the Al2OF2 complex as the dominating species for atomic ratio O/Al < 0.3 and a mol fraction of K2AlF4 < 0.05, agreeing with similar investigations of the corresponding sodium system. A new possible explanation of the anode effect in industrial aluminum electrolysis is provided. The investigation highlights the interactions between cryolite and oxides in molten metal fluoride systems, contributing to a deeper understanding of aluminum electrolysis processes and complex behavior in these melts.

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Cite This Work

@article{23246540-591f-4493-8d16-ab5fdeec24af,
  title={Oxy fluoro aluminate complexes in molten},
  author={S. K. Ratkje},
  year={2026},
  language={en}
}
TY  - JOUR
TI  - Oxy fluoro aluminate complexes in molten
AU  - S. K. Ratkje
PY  - 2026
LA  - en
ER  -

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