Metal-based anodes for aluminium electrowinning cells

Details Metal-based anodes for aluminium electrowinning cells Metal-based anodes for aluminium electrowinning cells

C - Chemistry, Metallurgy

25

C

C25C 3/12 (2006.01)

Patent

CA 2393415

An anode of a cell for the electrowinning of aluminium comprises a nickel-iron alloy substrate having an openly porous nickel metal rich outer portion whose surface is electrochemically active. The outer portion is optionally covered with an external integral nickel-iron oxide containing surface layer which adheres to the nickel metal rich outer portion of the nickel-iron alloy and which in use is pervious to molten electrolyte. During use, the nickel metal rich outer portion contains cavities some or all of which are partly or completely filled with iron and nickel compounds, in particular oxides, fluorides and oxyfluorides.

Une anode d'une cellule pour l'extraction électrolytique d'aluminium comprend un substrat en alliage nickel-fer qui comporte une partie ouvertement poreuse riche en nickel métallique dont la surface est électrochimiquement active. La partie externe est éventuellement recouverte d'une couche de surface contenant de l'oxyde fer-nickel qui adhère à la partie ouvertement poreuse riche en nickel métallique de l'alliage nickel-fer et qui est perméable en cours d'utilisation à l'électrolyte en fusion. Lors de l'utilisation, la partie ouvertement poreuse riche en nickel métallique contient des cavités dont certaines ou toutes sont complètement ou partiellement remplies avec des composés de fer et de nickel, notamment d'oxydes, de fluorures et d'oxyfluorures.

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