Uncompensated residual magnetic field in aluminium electrolysis cells leads to metal instability which is reflected as voltage instability referred to as voltage noise. The latter affects current efficiency and power ...

The Hall-Heroult process for the production of aluminium is based on the electrochemical reduction of alumina (Al2O3) dissolved in a cryolite (Na3AlF6) based electrolyte. Instability in cell voltage is referred to as noise. ...