FIELD: metallurgy.
SUBSTANCE: inventions relate to non-ferrous metallurgy and can be used for refining aluminium melt or its alloys from metal impurities. Methods include placing a melt of contaminated aluminium or an aluminium alloy and an electrolyte containing a melt of a mixture of salts of alkali or alkali-earth metals and aluminium salts, in device for electrolytic refining, DC supply and electrolytic refining. Refining process is carried out with cathode current density in range from 0.5 A/cm2 to 21 A/cm2 and in temperature range from 780 °C to 920 °C. Electrolyte in molten state has density higher or lower than density of molten cathode aluminium or its alloy.
EFFECT: higher efficiency, replenishment and correction of electrolyte composition.
10 cl, 4 dwg, 2 ex
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