Prevention of dissolution of metal-based aluminium production anodes
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United States of America Patent
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Oct 28, 2003
Grant Date -
Apr 24, 2003
app pub date -
Mar 30, 2002
filing date -
Dec 1, 2000
priority date (Note) -
Expired
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Abstract
A method of inhibiting dissolution of a transition metal alloy anode (40) of an aluminium electrowinning cell comprises providing a sodium-inert layer (11,20,50,50') on a sodium-active cathodic cell material (15), such as carbon, and electrolysing alumina dissolved in a sodium ion-containing molten electrolyte (30). Aluminium ions rather than sodium ions are cathodically reduced on the sodium-inert layer to inhibit the presence in the molten electrolyte (30) of soluble cathodically-produced sodium metal that constitutes an agent for chemically reducing the anode's transition metal oxides and anodically evolved oxygen, thereby inhibiting reduction of the anode's transition metal oxides by sodium metal and maintaining the evolved oxygen at the anode at a concentration such as to produce at the alloy/oxide layer interface stable and coherent transition metal oxides having a high level of oxidation. The sodium-inert layer may comprise molten aluminium (20) and/or a layer of refractory hard material (11,50,50').
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