Abstract
The electronic conductivity of molten Na3AlF6 saturated with A12O3 was determined as a function of the activity of Na at 1000 °C by using the Wagner polarization technique. Typical results showed electronic conductivities of 0.298 ohm-1 cm-1 at aNa = 0.04 and 0.084 ohm-1 cm-1 at aNa = 0.01. A transient technique employing the same experimental cell was used to determine the diffusion coefficient and the mobility of electrons in this melt. The mobility is 0.33 cm2 V-1 s-1. A model calculation for electrolysis of a melt of cryolite saturated with alumina to produce aluminum metal is presented to show how electronic conductivity effects current efficiency (CE). Under various assumed conditions, which are tabulated, CEs ranged from around 85 to 98 pct at 1000 °C.
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