Aluminum smelting electrode destruction with molten salt

Details Aluminum smelting electrode destruction with molten salt Aluminum smelting electrode destruction with molten salt

A - Human Necessities

62

D

A62D 3/32 (2007.01) B09B 3/00 (2006.01) F23G 7/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2140823

A process for destruction of spent aluminum smelting carbon anodes and carbon block cathodes which are contaminated with cryolite, Na3AlF6, comprising introducing such spent carbon electrodes into a molten salt bath, e.g. molten sodium carbonate, at elevated temperature, e.g. about 900°C, together with air or oxygen, and catalytically oxidizing and destroying the spent carbon anodes in such molten bath, and recovering an off-gas containing chiefly CO2 and retaining spent salts including sodium fluoride and sodium aluminate in the molten salt bath. The molten salt bath also destroys any small amount of NaCN which may also be present in the cryolite contaminant, and converts such NaCN to nitrogen and CO2, which are released in the off-gas.

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