Hall-Héroult Process - block flow diagram | Source: Vikram M.

The Hall–Héroult process is an electrometallurgical process that dissolves smelter-grade alumina (Al₂O₃, produced by the Bayer process) in a molten cryolite (Na₃AlF₆) electrolyte bath held at approximately 950–980°C, and passes a large direct current through the melt to electrochemically reduce aluminium ions to liquid aluminium metal, which is tapped from the cell floor. It is a continuous electrolytic process operating in large, lined rectangular cells called pots, arranged in series in long buildings called potlines.

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