Method for treating solid residues containing heavy metals from

Details Method for treating solid residues containing heavy metals from Method for treating solid residues containing heavy metals from

1989-09-25

1991-09-03

Lewis, Michael L.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

423 1, 423DIG20, 210912, 210914, B09B 300, C22B 702, C04B 1804

Patent

active

050451154

ABSTRACT:
In the treatment of solid residues containing heavy metals from combustion plants, the heavy-metal compounds dissolved after washing-out and subsequently precipitated are separated from the solvent, usually water or slightly acid aqueous solutions by cross-current diaphragm filtration. The sludge obtained during filtration and comprising precipitated insoluble heavy-metal compounds is dewatered together with the remaining solid residues and made suitable for dumping, e.g. by using binders. The cross-current diaphragm filter improves the washing of heavy metals out of the washing or waste water, and the method and the associated plant are simplified by the joint processing of the sludges containing solids.

REFERENCES:
patent: 4025430 (1977-05-01), Pagel
patent: 4049545 (1977-09-01), Horrath
patent: 4348228 (1982-09-01), Zarur
patent: 4465597 (1984-08-01), Herman et al.
patent: 4617180 (1986-10-01), Vogg

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