Aluminium electrowinning with metal-based anodes
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United States of America Patent
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Issued Date -
Dec 11, 2003
app pub date -
Jun 8, 2002
filing date -
Jun 8, 2002
priority date (Note) -
Abandoned
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Abstract
A process for the electrowinning of aluminium from alumina dissolved in a fluoride-based molten electrolyte in a cell operating at reduced temperature, typically below 870.degree. C., utilising nickel-alloy based anodes, in particular nickel-iron alloy anodes. The electrolyte contains AlF.sub.3 in such a high concentration, usually above 20 weight %, in addition to cryolite, that fluorine-containing ions rather than oxygen ions are oxidised on the anodes. However, only oxygen is evolved, the evolved oxygen being derived from the dissolved alumina present near the anodes. The anodes may be porous at the surface so as to provide a high active surface area for operation at low current density.
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