Decomposition of cyanide in electrolytic cell lining

Details Decomposition of cyanide in electrolytic cell lining Decomposition of cyanide in electrolytic cell lining

1996-06-12

1997-11-04

Valentine, Donald R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

588246, 205687, 423371, C01F 100, A62D 300

Patent

active

056836635

ABSTRACT:
A method of treating sodium cyanide in spent carbonaceous and/or refractory material, i.e., spent potlining, from an electrolytic cell for producing aluminum from alumina dissolved in a sodium-containing electrolyte, wherein sodium cyanide forms in the carbonaceous material during operation of the cell. The method comprises grinding the spent carbonaceous and/or refractory material containing sodium cyanide to provide particles of spent carbonaceous material and adding a reactive material capable of reacting with the sodium cyanide to provide a mixture of reactive material and spent potlining material. Thereafter, the mixture is heated to a temperature effective in reacting the reactive material with the sodium cyanide to destroy the sodium cyanide in the spent potlining.

REFERENCES:
patent: 4889695 (1989-12-01), Bush
patent: 5160637 (1992-11-01), Bell et al.
patent: 5470559 (1995-11-01), Grolman et al.

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