C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/148, 204/197
C25C 3/06 (2006.01)
Patent
CA 1172600
ABSTRACT An anode composition as the sole source of aluminum comprising an aluminous material such as aluminum oxide and a reducing agent such as carbon for use in the electro- deposition of aluminum at low temperatures. The electrodeposition of aluminum at low temperatures and low electrical potential by the electrolysis in a fused salt containing a composite anode within the electrolytic cell by the reaction of the anode under electrolysis to produce aluminum during the electrolysis. An aluminum compound ionized at the anode is electrolytically reduced to molten aluminum at the cathode and an anion formed at the anode reacts to produce CO2 gas at the anode. In one operational mode a unique porous membrane passes electrolyte or other dissolved material while withholding undissolved impurities. Aluminum also may be electrodeposited from aluminum oxide to produce molten metal, at a temperature as low as the melting point of the metal and with the use of an all fluoride containing bath and the composite anode. Dimensionally stable cells for the electrodeposition of aluminum may have sloped walls forming electrodes that permit the maintenance of a reduced anode current density as well as anode-cathode spacing when using the low temperature non- aggressive baths permissible with the particular composite anode composition.
347289
Upperman Gary V.
Withers James C.
G. Ronald Bell & Associates
Metallurgical Inc.
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