Recovery of coated aluminium scrap

Details Recovery of coated aluminium scrap Recovery of coated aluminium scrap

C - Chemistry, Metallurgy

22

B

148/27

C22B 21/00 (2006.01)

Patent

CA 1174946

A B S T R A C T 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°C is applied to the scrap before the lacquer coating of the scrap is pyrolysed, preferably at a temperature of 400-500°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.

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