Recycling of spent pot linings

Details Recycling of spent pot linings Recycling of spent pot linings

C - Chemistry, Metallurgy

22

B

C22B 3/04 (2006.01) B01D 11/02 (2006.01) B65G 23/44 (2006.01) C22B 7/00 (2006.01)

Patent

CA 2327878

A process is described for the treatment of spent pot lining material from electrolyte reduction cells, this spent material having a substantial content of cryolite. The spent material is first leached with water at a dilution and a time sufficient to dissolve substantially all water soluble fluorides, after which the solid residue is separated from the liquid. The solid residue obtained is then subjected to a caustic leach with an aqueous sodium hydroxide solution containing about 20 to 50 g/L of NaOH and thereafter the solid residue is separated from the liquid.

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