C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/48
C25C 3/06 (2006.01) C22B 21/06 (2006.01) C25C 3/24 (2006.01)
Patent
CA 1138374
ABSTRACT OF THE DISCLOSURE A process for purifying impure aluminum comprises introducing the impure aluminum to the anode layer of an electro- lytic cell of the type having a bottom layer of molten aluminum- copper alloy constituting the anode layer and having a top layer of molten aluminum constituting a cathode layer, the cathode and anode layers separated by an electrolyte layer. Aluminum is electrolytically transported from the anode to the cathode in a first purification step and then fractionally crystallized to remove further impurities therefrom by crystallizing pure aluminum high in impurities, from the purified aluminum. The impure molten aluminum portion is then recycled back to the electrolytic cell or to another fractional crystallization step.
333280
Dawless Robert K.
Jacobs Stanley C.
Aluminum Company Of America
Smart & Biggar
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