| abstract |
ABSTRACT FILTERS FOR LIGHT METALS A filter for light metals comprises a cellular body formed of a composition comprising at least one fluxing agent for the light metal. Suitable fluxing agents include alkali metal fluorides, alkaline earth metal fluorides,aluminium fluoride, complex alkali metal fluorides, calcium metaphosphate, borates, boron phosphates and low melting point glasses. The filters preferably have a melting point of 800 - 1000°C, more preferably 850 - 900°C. When used filters are added to a furnace with light metal which is to be remelted and the metal is melted in the presence of an exothermic flux the filters disintegrate allowing metal contained in them to be recovered. |