Fixation and stabilization of metals in contaminated soils and m

Details Fixation and stabilization of metals in contaminated soils and m Fixation and stabilization of metals in contaminated soils and m

1997-10-02

1999-06-29

Suchfield, George

Hazardous or toxic waste destruction or containment

Containment

Solidification, vitrification, or cementation

405128, 588 2, 588 16, E02D 300, G21F 900

Patent

active

059161230

ABSTRACT:
The present invention discloses a method of treating lead bearing process materials and lead toxic hazardous wastes. The invention relates to treatment methods employed to chemically convert leachable lead in lead bearing solid and liquid waste materials to a non-leachable form by mixing the material with lime, gypsum and/or phosphoric acid. The solid and liquid waste materials include contaminated sludges, slurries, soils, wastewaters, spent carbon, sand, wire chips, plastic fluff, cracked battery casings, bird and buck shots and tetraethyl lead contaminated organic peat and muck. The present invention discloses a process comprising a single step mixing of one or more treatment additives, and a process comprising a two step mixing wherein the sequence of performing the steps may be reversible. The present invention provides a new way of treating a universe of lead contaminated materials at any pH.

REFERENCES:
patent: 3837872 (1974-09-01), Conner
patent: 4518508 (1985-05-01), Conner
patent: 5202033 (1993-04-01), Stanforth et al.
patent: 5202100 (1993-04-01), Nagel et al.
patent: 5527982 (1996-06-01), Pal et al.
patent: 5569155 (1996-10-01), Pal et al.
patent: 5605417 (1997-02-01), Englert et al.
patent: 5649894 (1997-07-01), White et al.

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