Patent ID: 6216768
Filing Date: 2001-04-17
Classification: B22C,B22D,C21C

Abstract:
Device (1) for filtering and treating molten metal, comprising a set of at least two filtering plates (2, 3), consisting of a refractory mineral material and having through-holes (4, 4a) for the passage and the filtration of the molten metal, such filtering plates being kept at a certain distance apart by means of peripheral walls (5) so as to provide, between them, a cavity (6) receiving an insert (7) made of a treating material for said molten metal and having such a shape that, as seen in the direction of flow (8) of the molten metal, the insert (7) leaves at least one uncovered area (9) on the filtering plates (2, 3), said insert having a module which is the ratio of the volume to the total developed surface area of said insert wherein the ratio (R1) of the number of free holes (4a) in a filtering plate (2, 3), located in the areas (9) which are not covered by the insert (7) of treating material, on the one hand, to the total number of holes (4, 4a) in said filtering plate (2, 3), on the other hand, is not less than 10% and not above 75%.