Stabilization of fluorides of spent potlining by chemical disper

Details Stabilization of fluorides of spent potlining by chemical disper Stabilization of fluorides of spent potlining by chemical disper

1990-03-30

1991-06-18

Langel, Wayne A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

106705, 106789, 204 67, 423115, 423130, 501 28, 501128, 501155, C01F 702

Patent

active

050248227

ABSTRACT:
A process for treating spent potlining from the electrolytic smelting of aluminum in cryolite includes incinerating the potlining to combust carbonaceous material to form an ash at a temperature low enough to maintain low fluorine vapor pressures, admixing siliceous material with the potlining either before of after the ash-forming stage, and heating the ash and siliceous material to form a glassy residue.
The residue formed by the process of the present invention produces a spent potlining suitable for landfill characterized by a low leachability of fluorine in water.

REFERENCES:
patent: 4160808 (1979-07-01), Andersen et al.
patent: 4956158 (1990-09-01), Nguyen et al.
patent: 4973464 (1990-11-01), Rickman
Arkansas Democrat, "Alcoa Uses Plant Near Benton to Burn New York, Wastes," Little Rock, Ark., Oct. 30, 1986.
Ogden Environmental Services, Inc., Phase 2 Development of the Circulating Bed Combustion of Spent Potliners (Sep. 1987), pp. iii to 3-50.

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