FIELD: metallurgy.
SUBSTANCE: method includes grinding, crushing, water leaching of slag, pulp filtration, evaporation of a salt solution, drying of an oxide residue and its electrolysis. Oxide residue is loaded into an electrolytic cell 6÷8 times per day, in amount of 3.1÷4.9% of the electrolyte mass, dissolved in a fluoride electrolyte containing NaF and AlF3 with cryolite ratio of 1.8÷2.2, and electrolysis is carried out to produce a process alloy, which contains the following, in wt %: Al - 83÷95, Si - 3÷12, Fe - 2÷5.
EFFECT: possibility of complete extraction of metal aluminium from slag, using oxide component of slag to produce an aluminium-based alloy, reduced formation of wastes and simplified scheme of slag processing.
3 ex
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