GJENVINNING AV ALUMINIUM FRA SKRAPALUMINIUM.

摘要

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 DEG C. is applied to the scrap before the lacquer coating of the scrap is pyrolyzed, preferably at a temperature of 400 DEG -500 DEG 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.