Recovery of coated aluminium scrap

Details Recovery of coated aluminium scrap Recovery of coated aluminium scrap

1981-01-21

1982-12-28

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 44S, 75 93AC, 134 19, C22B 2106

Patent

active

043659934

ABSTRACT:
In a process for recovering aluminium from lacquer-coated scrap a solution of a mixture of halide salts, which melts at a temperature of less than 710.degree. C. is applied to the scrap before the lacquer coating of the scrap is pyrolyzed, preferably at a temperature of 400.degree.-500.degree. C. The salt mix acts as a flux and the burnt-off scrap yields a clean recovered metal relatively free from oxide inclusions. The preferred flux is a 50:50 mixture of sodium chloride and potassium chloride, with an optional addition of up to about 3% of an alkali metal fluoride.

REFERENCES:
patent: 1291672 (1919-01-01), Sutcliffe
patent: 3649247 (1972-03-01), Brondyke et al.
patent: 3650830 (1972-03-01), Mathis
patent: 3924035 (1975-12-01), Miller
patent: 4060408 (1977-11-01), Kuhn

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