FREMGANGSMAATE VED FJERNING AV INNESLUTNINGER FRA SMELTET METALL, SAMT ET FILTER FOR ANVENDELSE AV FREMGANGSMAATEN

摘要

The invention provides a method of removing inclusions from molten metal, particularly aluminum, by (a) contacting the molten metal with a medium which retains metal-non-wettable inclusions. The medium may be liquid such as a fused salt mixture; or solid such as a filter or metal-non-wettable ceramic materials or a bed of granules e.g. of tabular alumina, (b) passing the molten metal through a filter of metal-wettable material, e.g. a refractory hard metal such as titanium diboride. The metal-wettable filter attracts and holds metal wettable inclusions within itself, and may also prevent by surface tension the entry of fused salt droplets.