Method for treating incinerator ash

Details Method for treating incinerator ash Method for treating incinerator ash

1989-02-22

1991-08-20

Lewis, Michael L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

423 92, 423 98, 423101, 423104, 423109, 106705, 106DIG1, C03C 600

Patent

active

050413988

ABSTRACT:
A process for treatment of incinerator ash typically including heavy metals and both water soluble and insoluble fractions. The insoluble fraction is first removed from the fly ash. The soluble fraction is treated to precipitate heavy metal compounds. Preferably, the heavy metal precipitates are incorporated in a vitrifiable batch. In a separate vitrifiable batch, the insoluble fly ash portions may also be incorporated. Most preferably, bottom ash from the incinerator is also incorporated in a glass batch. The bottom ash glass batch may also incorporate the insoluble fraction from the fly ash.
Precipitation of the heavy metal constituents in the soluble portion of the fly ash is preferably accomplished by raising the pH of the solution, most preferably above 10 by addition of alkali metal or alkaline earth metal hydroxides.

REFERENCES:
patent: 3188201 (1965-06-01), Sontheimer et al.
patent: 3311447 (1967-03-01), Stuart
patent: 3630673 (1971-12-01), Mod et al.
patent: 4065281 (1977-12-01), Byrne
patent: 4069315 (1978-01-01), Wagner et al.
patent: 4191546 (1980-03-01), Kroyer
patent: 4524049 (1985-06-01), Sit
patent: 4678493 (1987-07-01), Roberts
patent: 4720295 (1988-01-01), Bronshtein

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