Method of selective recovery of ferrous and nonferrous metals fr

Details Method of selective recovery of ferrous and nonferrous metals fr Method of selective recovery of ferrous and nonferrous metals fr

1993-03-22

1994-11-22

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

75740, 423 32, C25C 112

Patent

active

053665996

ABSTRACT:
After optional preliminary treatment, solid wastes are processed in accordance with the flowsheet FIG. 1: first, Cu is leached selectively with a leaching solution containing Cu(II) ammine as a leachant according to the autooxidation or the autocatalytic action which proceeds depending on the equations: ##STR1## and the Cu(II) ammine concentrated in the leaching solution is extracted with a solvent Lix-54; thereafter, Cu.sup.2+ is stripped so that it moves into a Cu electrolyte and Cu electrowinning is performed to have metallic Cu deposited at the cathode, with the total process being carried out in a closed circuit. By this process, copper and other nonferrous metals can be selectively recovered from motor scrap and shredded solid wastes such as abandoned automobiles and home electric appliances in a simple and economical manner.

REFERENCES:
patent: 3832162 (1974-08-01), Smith
patent: 3967957 (1976-07-01), Fonseca
patent: 5176802 (1993-01-01), Duyvesteyn et al.
Kuhn et al, "Anaconda's Arbiter Process for Copper", CIM Bulletin, Feb., 1974, pp. 62-73.
Iwase et al, "A feasibility study for the removal of copper from solid ferrous scrap", "steel research 62", Jan., 1991 No. 6, pp. 235-239.
Jimbo et al, "The Refining of Copper From Ferrous Scrap", I&SM, Aug. 1988, pp. 20-23.
Halpern et al, "Kinetics of the Dissolution of Copper in Aqueous Ammonia", Journal of the Electrochemical Society, Oct. 1958, pp. 422-428.

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