Journal of Siberian Federal University. Chemistry / Specific Features of the Calcium-containing Phase Crystallization in Electrolyte of Aluminium Melting Production

Full text (.pdf)
Issue
Journal of Siberian Federal University. Chemistry. 2008 1 (3)
Authors
Zaytseva, Julia N.; Lyndina, Elena N.; Yakimov, Igor S.; Kirik, Sergey D.
Contact information
Julia N. Zaytseva: aInstitute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, 42 Karl Marks st., Krasnoyarsk, 660049 Russia, e-mail: ; Elena N. Lyndina, Igor S. Yakimov: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041 Russia; Sergey D. Kirik: Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, 42 Karl Marks st., Krasnoyarsk, 660049 Russia Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041 Russia
Keywords
aluminium melting production; industrial electrolites; phase-equilibria diagram in the system NaF-AlF3-CaF2; ternary fluorides containing calcium-sodium-aluminium; XRD
Abstract

The specific features of calcium–containing phases crystalization have been investigated in case of industrial electrolyte sampling for the purposes of composition control. The influence of cooling rate on the crystalization has been studied. It was found that the phase NaCaAlF6 was stable in the temperature range of 640-740 °C . Transformation of NaCaAlF6 into Na2Ca3Al2F14 goes with isolation of NaAlF4 at 560-610 °C . High temperature XRD investigation of individual samples of NaCaAlF6 and Na2Ca3Al2F14 has been carried out. In the practice the decomposition of NaCaAlF6 does not fully complete at a sampletaking procedure that induces impediments in the content determination by XRD approach. Recommendations on an optimal sampling for XRD control procedure were formulated.

Pages
260-268
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/837