Process for reclaiming aluminum from waste paper and packaging p

Details Process for reclaiming aluminum from waste paper and packaging p Process for reclaiming aluminum from waste paper and packaging p

1993-12-23

1995-10-10

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

423556, C01F 774

Patent

active

054567394

ABSTRACT:
Aluminum is recovered from organic waste paper and packaging material containing aluminum foil by heating the waste material in a kiln or other such device to decompose the organic constituents in the waste material, preferably by pyrolysis, producing hot gaseous by-products with a carbonaceous ash residue containing aluminum. The ash residue is contacted with an aqueous solution of sulfuric acid under conditions which cause the aluminum to react with the sulfuric acid to produce aluminum sulfate. Preferably, the ash/acid contacting is carried out with a relatively dilute sulfuric acid solution and at an elevated temperature in the range of from about 80.degree. C. to about 100.degree. C. to produce Al.sub.2 (SO.sub.4).sub.3.18H.sub.2 O as the reaction product.

REFERENCES:
patent: 2977255 (1961-03-01), Lowry
patent: 4320098 (1982-03-01), Huckabay

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