Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1995-12-08
1998-03-03
Marcheschi, Michael
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423113, 423115, 423131, 423133, 423138, 423155, 423179, 423240R, 423483, 423484, 423551, 501128, 501153, 501154, 501155, 75 1048, 75673, C01F 704, C01B 719, C01B 722
Patent
active
057230978
ABSTRACT:
A method of treating spent potliner material from aluminum reduction cells is disclosed. The spent potliner material is introduced into a sulfuric acid digester to produce a gas component including hydrogen fluoride and hydrogen cyanide and a slurry component including carbon, silica, alumina, sodium sulfate, iron, calcium and magnesium. The gas component is recovered and heated an effective amount to eliminate hydrogen cyanide and produce a remaining gas component including CO.sub.2, H.sub.2 O, nitrogen oxides and HF. The remaining gas component is directed through a water scrubber to form hydrofluoric acid, and the hydrofluoric acid is admixed with aluminum hydroxide to create aluminum fluoride. The slurry component is rinsed with water to separate a first solid fraction containing carbon, alumina and silica from a second liquid faction. The pH of the liquid fraction is adjusted to first create and separate aluminum hydroxide and then to separate sodium sulfate. Finally, the solid fraction is admixed with an alumina/silica mix and then subjected to an elevated temperature in an oxygen-rich atmosphere to oxidize the carbon and vitrify the alumina and silica into refractory material.
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Barnett Robert J.
Mezner Michael B.
Goldendale Aluminum Company
Isaac John L.
Marcheschi Michael
Margolis Donald W.
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