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

1988-03-29

1990-09-11

Stoll, Robert L.

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

049561588

ABSTRACT:
The present invention provides a process for treating spent potlining from the electrolytic smelting of aluminum in cryolite including burning the spent potlining to form an ash, mixing with a siliceous material either before or after the ash-forming step, and heating to form a residue suitable for landfill. The ash and siliceous material are mixed in a specified mole ratio of at least about 1.4 silicon to sodium. The process further includes cooling the residue rapidly.
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.

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Arkansas Democrat, Alcoa Uses Plant Near Benton to Burn New York Wastes, Little Rock, AK, 30486.

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