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On the anode effect in cryolite—alumina Melts—III. Current—voltage behaviour during anode effect

✍ Scribed by F. Nordmo; J. Thonstad

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
872 KB
Volume
29
Category
Article
ISSN
0013-4686

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✦ Synopsis

Previous measurements of the current -voltage behaviour during anode effect in cryolite melts

were extended to other NaF/AlF, ratios and to pure sodium halides. In all systems the current-voltage curves had similar shapes, showing several maxima and minima. The AE voltage range in which cryolite extended from -3 10 -14OV, could be divided into three stages. Wow 5 5OV the current appeared to be concentrated at protruding areas on the anode and bright sparks were seen. At higher voltage (60 V) a stable glow discharge was observed followed by renewed sparking (-75 V) and finally a stable arc (-135V).

Violent voltage/current oscillations occurred in ranges where sparking was observed. The anode became overheated, reaching 18CWC at 100 V incryolite at 1010°C. The current decreased when the external pressure was lowered and the voltage at which a stable arc was lit was increased.

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