Process for recovery of trace metals and salts from waste combus

Details Process for recovery of trace metals and salts from waste combus Process for recovery of trace metals and salts from waste combus

1992-02-13

1994-02-01

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204109, 204114, 204117, 423 98, 423109, 423157, 423150, 423 53, 423155, 423 27, 423131, C25C 100

Patent

active

052829383

ABSTRACT:
A method for the continuous treatment of air pollution control residues from various resource recovery systems whereby the air pollution control residue is treated with a dilute salt extracting solution at a pH chosen to maximize the recovery of lead, for a reaction time chosen to maximize the recovery of lead, and for a number of recycles chosen to maximize the recovery of lead from the particular residue being treated. Other metals and dissolved salts can also be recovered from the extracting solution. Thus by monitoring these three variables for each batch of residue, and adjusting the extracting solution accordingly, residue from various sources and of varying composition can be treated efficiently and continuously to remove hazardous metals and dissolved salts from the residue. Bottom residue fines, alone or admixed with air pollution control residues, can also be treated in accordance with the process of the invention.

REFERENCES:
Legiec et al., Environmental Progress, Aug. 1989, vol. 8, No. 3, pp. 212-216.
Kosson et al., Solid Waste Combustion Residuals Utilization Conference, Oct. 13-14, 1988.
Legiec et al., Proceedings: Third International Conference on New Frontiers for Hazardous Waste Management, Sep., 1989, 253-261.
Legiec et al., International Conference on Municipal Waste Combustion, Apr., 1989.

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