Electrochemical characterization of multicomponent sodium cryolite electrolytes with high content of aluminium fluoride

Electrochemical impedance spectroscopy is a suitable measurement method for the investigation of electrical conductivity of new types of aluminium electrolytes. Low-temperature electrolytes together with inert electrodes represent an innovation of the aluminium electrolysis process. Electrical condu...

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Bibliographic Details
Published in:Electrochimica acta 2018-03, Vol.265, p.474-479
Main Authors: Kubiňáková, Emília, Danielik, Vladimír, Híveš, Ján
Format: Article
Language:English
Subjects:
Additives
Aluminium electrolysis
Aluminum
Aluminum fluorides
Aluminum oxide
Conductivity
Cryolite
Electrical conductivity
Electrical resistivity
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrodes
Electrolysis
Electrolytes
Fluorides
Inert electrodes
Innovations
Lithium fluoride
Low-temperature electrolytes
Magnesium fluorides
Melts
Temperature dependence
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Summary:Electrochemical impedance spectroscopy is a suitable measurement method for the investigation of electrical conductivity of new types of aluminium electrolytes. Low-temperature electrolytes together with inert electrodes represent an innovation of the aluminium electrolysis process. Electrical conductivity, as one of the most important properties of electrolytes, has been investigated and described as part of the studied area of low-temperature sodium cryolite mixtures. Electrolytes used in this study contained high content of aluminium fluoride, up to 45 mol %; the molar ratio of NaF to AlF3 in the melts varied from 2.0 to 1.2. Mutual influence of commonly used additives in industrial electrolytes (AlF3, Al2O3, CaF2, MgF2, LiF) and their temperature dependence was determined. Electrical conductivity was measured using a tube-type cell with stationary electrodes applying AC-techniques with a sine wave signal in the high frequency range. Concentration and temperature dependences of the electrical conductivity for all the studied low-temperature multi-component systems were described by the regression equation.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.01.174