Combination diaphragm and fractional crystallization cell

Details Combination diaphragm and fractional crystallization cell Combination diaphragm and fractional crystallization cell

C - Chemistry, Metallurgy

25

C

204/48

C25C 3/24 (2006.01) C22B 21/02 (2006.01) C22B 21/06 (2006.01) C25C 3/06 (2006.01) C25C 3/08 (2006.01)

Patent

CA 1245178

Abstract of the Disclosure A method for purifying aluminum that contains impuri- ties, the method including the step of introducing such aluminum containing impurities to a charging and melting chamber located in an electrolytic cell of the type having a porous diaphragm permeable by the electrolyte of the cell and impermeable to molten aluminum. The method includes further the steps of supply- ing impure aluminum from the chamber to the anode area of the cell and electrolytically transferring aluminum from the anode area to the cathode through the diaphragm while leaving impurities in the anode area, thereby purifying the aluminum introduced into the chamber. The method includes the further steps of collecting the purified aluminum at the cathode, and lowering the level of impurities concentrated in the anode area by subjecting molten aluminum and impurities in said chamber to a fractional crystal- lization treatment wherein eutectic-type impurities crystallize and precipitate out of the aluminum. The eutectic impurities that have crystallized are physically removed from the chamber. The aluminum in the chamber is now suited for further purifica- tion as provided in the above step of electrolytically transfer- ring aluminum through the diaphragm.

432718

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