Gas Depolarized Graphite Anodes for Aluminum Electrowinning

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Abstract
Anode potential sweep studies on electronic conducting refractories and several metals in a cryolite‐alumina melt have shown copper, nickel, and graphite to be the most stable anode materials. However, even these materials were attacked in this electrolyte at anodic potentials normally attained in aluminum electrowinning. Uncatalyzed graphite electrodes could be depolarized by methane, but carbon monoxide would depolarize only catalyzed electrodes. There are significant fluoride losses from the electrolyte when hydrogen‐containing fuel gases are used to depolarize the anode.

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