Patent ID: 7727461
Filing Date: 2010-06-01
Classification: C22B,Y02P

Abstract:
1. A furnace filtration well adapted to filter solid contaminants from a bath of molten metal that are too large to pass through the impeller openings of a centrifugal impeller pump located within a pump well, comprising: at least two walls that cooperate to define an enclosure, said walls including an upstream wall and a downstream wall, said upstream wall including an inlet arch and said downstream wall including an outlet arch that is in direct fluid communication with said pump well; and filter means covering said outlet arch, whereby said molten metal flows therethrough, said filter means including a plurality of spaced graphite tubes saturated with an inert gas and preventing solid contaminants that are sized larger than said impeller openings from passing into said pump well, but allowing any solid contaminants that are at least ten percent smaller than said impeller openings to flow into said pump well.