Multi-layer non-carbon metal-based anodes for aluminum productio

Details Multi-layer non-carbon metal-based anodes for aluminum productio Multi-layer non-carbon metal-based anodes for aluminum productio

1998-07-30

2000-06-20

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Utilizing fused bath

2042431, 204244, 204245, 204290R, C25C 308, C25C 312, C25B 1100

Patent

active

060774150

ABSTRACT:
A composite, high-temperature resistant, non-carbon metal-based anode of a cell for the electrowinning of aluminium comprises a metal-based core structure of low electrical resistance, for connecting the anode to a positive current supply, coated with a series of superimposed, adherent, electrically conductive layers. These layers consist of at least one layer on the core structure constituting a barrier substantially impervious to monoatomic oxygen and molecular oxygen; one or more intermediate, protective layers on the oxygen barrier layer which remain inactive in the reactions for the evolution of oxygen gas; and an electrochemically active layer for the oxidation reaction of oxygen ions present at the anode/electrolyte interface into nascent monoatomic oxygen, as well as for subsequent reaction for the formation of gaseous biatomic oxygen. The active layer on the outermost intermediate layer is slowly consumable during electrolysis and protects the intermediate protective layer by inhibiting its dissolution into the electrolyte.

REFERENCES:
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patent: 5851677 (1998-12-01), Laurent et al.
patent: 5855751 (1999-01-01), Rangarajan et al.
patent: 5873988 (1999-02-01), Schulze et al.
patent: 5904828 (1999-05-01), Sekhar et al.

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