Removing inclusions from molten metal
AssigneeAlcan International Limited
InventorsAdam J. Gesing, Martin R. Reeve, Ghyslain Dube
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Abstract
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.
Claims13
A method of removing inclusions from molten metal which method comprises
- (a) providing a stream of molten metal containing inclusions including metal-wettable inclusions, and passing the stream through and in intimate contact with a medium which retains metal-non-wettable inclusions,
- characterized by also
- (b) passing the stream of molten metal through a filter of metal-wettable material which retains metal-wettable inclusions,
- steps (a) and (b) being performed in sequence in either order.
Dependencies are inferred from the claim text.