Journal of Siberian Federal University. Engineering & Technologies / Electrolytes Based on the Potassium Kriolit for Low-Temperature Obtaining of Aluminium

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Issue
Journal of Siberian Federal University. Engineering & Technologies. 2014 7 (5)
Authors
Tkacheva, Olga Yu.; Red`kin, Alexander A.; Dedyukhin, Alexander. A.; Apisarov, Alexey P.; Tin`gaev, Pavel E.; Zaykov, Yurii P.
Contact information
Tkacheva, Olga Yu.:Institute of High Temperature Electrochemistry, UB RAS 20 Akademicheskaya Str., Yekaterinburg, 620990, Russia; Red`kin, Alexander A.:Institute of High Temperature Electrochemistry, UB RAS 20 Akademicheskaya Str., Yekaterinburg, 620990, Russia; Dedyukhin, Alexander. A.:Institute of High Temperature Electrochemistry, UB RAS 20 Akademicheskaya Str., Yekaterinburg, 620990, Russia; Apisarov, Alexey P.:Institute of High Temperature Electrochemistry, UB RAS 20 Akademicheskaya Str., Yekaterinburg, 620990, Russia; Tin`gaev, Pavel E.:Institute of High Temperature Electrochemistry, UB RAS 20 Akademicheskaya Str., Yekaterinburg, 620990, Russia; Zaykov, Yurii P.:Institute of High Temperature Electrochemistry, UB RAS 20 Akademicheskaya Str., Yekaterinburg, 620990, Russia
Keywords
potassium cryolite; potassium-sodium cryolite; the electrical conductivity; liquidus temperature; solubility of aluminum oxide; calcium fluoride; low-temperature electrolysis
Abstract

The general regression equations basic physical and chemical properties (liquidus temperature, conductivity, solubility of alumina) mixed potassium-sodium cryolite melts with cryolite ratio 1,3- 1,5 with additives LiF and CaF2 are investigated and described. Based on the identified patterns the electrolyte composition, promising for low-temperature aluminum electrowinning are defined: KFAlF3 and KF-NaF-AlF3, containing 12-15 wt.% NaF, with cryolite ratio of 1,3-1,5 and the liquidus temperature below 800 C. The solubility of alumina in electrolytes such is not less than 4.5 wt.% in the temperature range of 700-800 C. In order to increase the electrical conductivity supplements LiF in an amount of not more than 3 wt.% are recommended. CaF2 in the presence of the electrolyte is not desirable

Pages
561-569
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/13331

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