Ultrastable anodes for aluminum production cells

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 3/12 (2006.01) B22F 3/23 (2006.01) C22C 1/04 (2006.01) C25C 3/06 (2006.01) C25C 7/02 (2006.01)

Patent

CA 2269727

An anode for the electrowinning of aluminum by the electrolysis of alumina dissolved in a molten fluoride electrolyte comprises a porous micropyretic reaction product of nickel, aluminum, iron, copper and at least one additive element selected from silicon, tin, zinc, vanadium, indium, hafnium, tungsten, elements from the lanthanide series starting from praesodymium, and misch metal. The micropyretic reaction product contains metallic and intermetallic phases, with a composite oxide surface produced in-situ by anodic polarization of the porous micropyretic reaction product in a molten fluoride electrolyte containing dissolved alumina, or by high temperature treatment in an oxidizing gas. The composite oxide surface usually comprises an iron-rich relatively dense outer portion and an aluminate-rich relatively porous inner portion.

Une anode, destinée à l'extraction électrolytique d'aluminium par électrolyse d'alumine dissoute dans un électrolyte fondu à base de fluorure, comprend un produit réactionnel micropyrétique poreux à base de nickel, d'aluminium, de fer, de cuivre et au moins un additif choisi entre le silicium, l'étain, le zinc, le vanadium, l'indium, le hafnium, le tungstène, les éléments de la série des lanthanides à partir du praesodyme, et un mischmetal. Le produit réactionnel micropyrétique contient des phases métalliques et intermétalliques, avec une surface oxydée composite produite in situ par polarisation anodique dudit produit réactionnel dans un électrolyte fondu à base de fluorure contenant de l'alumine dissoute, ou par traitement à haute température dans un gaz oxydant. La surface oxydée composite comprend généralement une partie externe riche en fer, relativement dense, et une partie interne riche en aluminates, relativement poreuse.

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