Abstract
The specific electric conductivities of ternary molten salts in the NaF-CaF2-AlF3 system relating to the electrolytes for primary aluminum smelting and aluminum refining were measured.1) In these ternary molten salts, the measuring values of the specific electric conductivity were 4.57-1.30 ohm-1cm-1 in the composition range of 3-20wt.% CaF2 at 1, 000°C.2) When the content of calcium fluoride is kept constant, the specific electric conductivity decreases almost linearly with the increase of aluminum fluoride weight percentage. Moreover, the specific electric conductivity decreases as the content of calcium fluoride increases also.3) The additivity law for conductance is applicable only in a limited region, then it is considered that the molten salt in this system may be complicated in structure bacause of the existence of various compounds such as Na3AlF6, NaAlF4, Na5Al3Fl4, CaAlF5 and NaCaAlF6 etc.
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