Carbon anode scrap | Source: SMF Metall

Anode butts (also called anode stubs or spent anodes) are the residual carbon blocks remaining after a prebaked carbon anode has been consumed during aluminium electrolysis in the Hall-Héroult process. When an anode block has been reduced to approximately 15–25% of its original mass — typically after 24–33 days of service — it is removed from the cell and replaced with a fresh anode to prevent the steel stub assembly from contacting the molten bath.

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