Conductivity of low-temperature KF-AlF3 electrolytes containing lithium fluoride and alumina

Abstract

Electroconductance of molten electrolytes KF-AlF3 (cryolite ratio 1.3) containing LiF or/and Al2O3 is evaluated using empirical equations. The electroconductivity of molten mixtures KF-AlF3, KF-AlF3-Al2O3, KF-AlF3-LiF, and KF-AlF3-LiF-Al2O3 is measured in the temperature interval 687 to 797°C. The electroconductivity is determined in cells with a capillary of pyrolytic boron nitride and parallel molybdenum electrodes. Comparing calculated and experimental data on the electroconductivity of cryolite-alumina melts confirms that the model proposed for the calculations reflects the temperature and concentration dependences adequately enough and makes it possible to forecast variations in the electroconductivity upon adding different admixtures into the electrolyte.