Process for the remediation of lead-contaminated soil and waste

Details Process for the remediation of lead-contaminated soil and waste Process for the remediation of lead-contaminated soil and waste

1996-09-18

1998-06-16

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

429 49, 405129, 588237, C22B 1300

Patent

active

057663033

ABSTRACT:
Lead-contaminated soil and battery casings are remediated using a plasma arc furnace which pyrolyzes the soil and waste battery casings so as to form a vitrified slag and a combustible gas, respectively. The combustible gas along with volatilized lead (and other heavy metals which may be present) are transferred to, and used as a primary fuel by, a conventional smelting furnace. The volatilized lead that is entrained in the combustible gas is thus transferred to the recovery and environmental protection/control equipment associated with the smelting furnace or other conversion system. The soil, on the other hand, is converted into a non-toxic (i.e., according to the Toxicity Characteristic Leaching Procedure) vitrified slag by the plasma arc which may be crushed and used as a commercial material (e.g., roadway aggregate, asphalt filler material and the like) or simply transferred to a landfill where it poses no environmental threat.

REFERENCES:
patent: 4177061 (1979-12-01), Stenkvist et al.
patent: 4431612 (1984-02-01), Bell et al.
patent: 4998486 (1991-03-01), Dighe et al.
patent: 5281790 (1994-01-01), Handfield et al.
"Energy-Saving DC Twin Shell Arc Furnace For Melting Low-Grade Scrap", ABB Review (Sep./Oct. 1996) pp. 18-27.
Chalfant, "Recovering Zinc and Iron From Electric-Furnace Dust", New Steel, p. 91, Sep. 1996.
Mintek, Application Report No. 11, "The Development, Up to Industrial Scale, of a Transferred Plasma-Arc Smelting Process for the Production of Ferro-Alloys" (1991) pp. 1-12.
Pyromet/Mintek, "Hollow Graphite Electrode D.C. Arc Furnace and Recovery Plant for Treatment of Steel Plant Dust" (1991). month unavailable pp. 1-18.
Mintek, Technology International, "Safe Disposal of Environmentally Unacceptable Dust" (1991) month available.

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