Sodium refinement/improvement of aluminium-silicon alloy melts

摘要

The method concerns sodium refinement/improvement of eutectic, near-eutectic and hypo-eutectic AlSi alloys by treatment of their melts with metallothermal mixtures containing sodium salts and metal powders as well as oxidation agents in the role of reactions initiators. It is characterised by the fact that with substances containing fluor excluded, the AlSi alloy melts are provided with treatment mixtures containing (in per cent by mass): 30-80 sodium carbonate; 30-80 potassium carbonate and/or sodium chloride; 15-30 magnesium and/or aluminium powder; 1-10 nitrates and/or chlorate of alkaline metals. Also claimed are the corresponding treatment mixture as means for implementation of the proposed method.