Electrolytes Based on the Potassium Kriolit for Low-Temperature Obtaining of Aluminium

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 elect...

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Published in:Journal of Siberian Federal University. Engineering & Technologies 2014-07, Vol.7 (5), p.561
Main Authors: Tkacheva, Olga Yu, Red'kin, Alexander A, Dedyukhin, Alexander A, Apisarov, Alexey P, Tin'gaev, Pavel E, Zaykov, Yurii P
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container_title Journal of Siberian Federal University. Engineering & Technologies
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Red'kin, Alexander A
Dedyukhin, Alexander A
Apisarov, Alexey P
Tin'gaev, Pavel E
Zaykov, Yurii P
description 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: KF-AlF3 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.
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title Electrolytes Based on the Potassium Kriolit for Low-Temperature Obtaining of Aluminium
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