Stabilization of fluorides of spent potlining by chemical disper

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium

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

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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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