Liquidus temperatures of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 melts

Liquidus temperatures of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 melts

Temperatures for the primary crystallization of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 system adopted in aluminum electrolysis process were determined by thermal analysis. An empirical equation was derived to describe the liquidus temperatures for the primary crystallization of this multicomponent elect...

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Bibliographic Details
Main Authors: Peng J.P., Di Y.Z., Wang Y.W., Bai Y.B., Feng N.X.
Format: Article
Language:English
Published: University of Belgrade, Technical Faculty, Bor 2014-01-01
Series:Journal of Mining and Metallurgy. Section B: Metallurgy
Subjects:
liquidus temperatures
electrolyte system
aluminum electrolysis
Online Access:http://www.doiserbia.nb.rs/img/doi/1450-5339/2014/1450-53391300040P.pdf
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Summary:Temperatures for the primary crystallization of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 system adopted in aluminum electrolysis process were determined by thermal analysis. An empirical equation was derived to describe the liquidus temperatures for the primary crystallization of this multicomponent electrolyte system: t/℃=1011 + 0.7w(AlF3) - 0.232w(AlF3)2 - 7.65w(Al2O3) + 0.523w(Al2O3)2 - 8.96w(LiF) + 0.043w(LiF)2 - 3.32w(KF) - 0.12w(KF)2 - 3.28w(CaF2) +0.037w(CaF2)2 + 0.091w(AlF3)w(LiF) + 0.074w(AlF3)w(KF) + 0.084w(AlF3)w(CaF2) - 0.27w(Al2O3)w(LiF), where w(AlF3) denotes the mass fraction of excess aluminum fluoride with respect to cryolite. While w(Al2O3) ranges from 2% to 4%, w(LiF), w(KF) and w(CaF2) from 0 to 7%, and the molar ratio of NaF/AlF3 from 2.2 to 3.
ISSN:1450-5339

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