FINING FLUX FOR EXTRACTION OF MAGNESIUM OUT OF ALUMINIUM ALLOYS Russian patent published in 2008 - IPC C22B9/10 

FIELD: metallurgy.

SUBSTANCE: invention refers to secondary metallurgy of light metals, particularly to composition of fining flux for extraction of magnesium out of aluminium alloys. The flux composition includes chlorides of alkaline metals, cryolite and fluorsilicate sodium. To reduce specific consumption of flux per 1 kg of extracted magnesium aluminium oxide is additionally introduced into the flux composition at the following ratio of components (weight %): Na₂SiF₆ 35-60; γ-Al₂0₃ + α-Al₂O₃ 15-3; Na₃AlF₆ 5-15; KCl 30-12; NaCl 15-10. Contents of α-Al₂O₃ in aluminium oxide in a powdered form is not more than 8% of the total value of aluminium oxide (γ-Al₂O₃ + α-Al₂O₃) in the flux contents. Thus the following is achieved: a higher efficiency of flux, reduction of its specific consumption per 1 kg of extracted magnesium at an average of 4.3 kg lower, than with other similar fluxes, simplification of the refining process, improvement of environment at working sites and possibility to extract magnesium out of all aluminium alloys which are produced at plants of secondary non-ferrous metals.

EFFECT: simplification of aluminium alloys refining process at higher efficiency of flux and reduction of its consumption.

2 cl, 5 ex