2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 3: Oye Intl. Symp. / Ionic Liquid and Aluminum

Editors:	Kongoli F, Feng N, Polyakov P, Gaune-Escard M
Publisher:	Flogen Star OUTREACH
Publication Year:	2016
Pages:	180 pages
ISBN:	978-1-987820-40-9
ISSN:	2291-1227 (Metals and Materials Processing in a Clean Environment Series)

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Structure And Properties Of Scandia Solutions In Cryolite Melts

Yuriy Zaikov¹; Alexander Redkin¹; Olga Tkacheva²; Alexander Dedyukhin³; Alexey Rudenko³;
¹INSTITUTE OF HIGH TEMPERATURE ELECTROCHEMISTRY OF THE URAL BRANCH OF THE RUSSIAN ACADEMY OF SCIENCES, Ekaterinburg, Russian Federation; ²IHTE, Ekaterinburg, Russian Federation; ³INSTUTUTE OF HIGH TEMPERATURE ELECTROCHEMISTRY, Yekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 344
Topic: 37

Abstract:

Basic properties (crystallization temperatures, electrical conductivity, oxides solubility) and structure of electrolytes composed of potassium (KF-AlF3), sodium (NaF-AlF3) cryolites or their mixtures with additions of scandia and alumina have been studied in order to determine the admissible concentration and temperature ranges for the production of aluminum-scandium alloys. The scandia in cryolite melts behaves similarly to the alumina: reduces the liquidus temperature and decreases the electrical conductivity. The solubility values of scandia and alumina in the sodium-cryolite-based melts are close. These facts indicate that the Sc2O3 interacts with cryolite melts forming Al2O3. However, in contrast to alumina, the scandia solubility in potassium cryolite (KF-AlF3) with the molar ratio of KF/AlF3<1.5 is rather low. Based on the Raman spectroscopy and solubility data it was assumed that a mechanism of the Sc2O3 dissolution in the KF-AlF3 and NaF-AlF3 melts is different. The scandia dissolves in the NaF-AlF3 with subsequent formation of the ScF63- and Sc2OF62- ions, whereas in the KF-AlF3 at temperatures of 650-800 °C the dissolution process is obstructed by a K3ScF6, highly melted and poorly soluble substance.

Keywords:

Molten Salt Chemistry and Thermodynamics;


Cite this article as:

Zaikov Y, Redkin A, Tkacheva O, Dedyukhin A, Rudenko A. Structure And Properties Of Scandia Solutions In Cryolite Melts. In: Kongoli F, Feng N, Polyakov P, Gaune-Escard M, editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 3: Oye Intl. Symp. / Ionic Liquid and Aluminum. Volume 3. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 145-146.