METHOD OF REFINING ALUMINIUM AND ALUMINIUM ALLOYS Russian patent published in 2009 - IPC C22B21/00 C22B9/10 

FIELD: metallurgy.

SUBSTANCE: invention refers to refining aluminium and aluminium alloys from most detrimental impurities, particularly non-metallic inclusions, hydrogen, and dissolved impurities of alkali and alkali-earth metals. The method of refining aluminium and its alloys consists in treatment of metal melt with flux containing halogenides of aluminium and alkali metals. Flux is supplied in several stages with intervals between supplies not less, than 5 minutes and with decreasing amount of flux at not more 1/3 from initially supplied flux in all successive stages. Slag is removed off surface of metal before mixing. Treatment is performed with a mixing facility in a transport ladle when level of metal melt is from 200 to 400 mm from the upper edge of the transport ladle and when central vortex cavity has depth not less 20 cm. Supply of flux is performed in two stages at mixing metal in the transport ladle of three ton capacity, and in three stages at mixing metal in the transport ladle of five ton capacity.

EFFECT: increased efficiency of process due to utilisation of the same mixing facility for various types of capacity maintaining specified consumption of flux per ton and total time of treatment.

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