Method and device for treating a metal or a molten metal alloy using an addition agent
OwnerMourad Toumiinventor
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Abstract
Method and device for treating a metal or a molten metal alloy using an addition agent The invention relates to a method and device for treating a metal or a molten metal alloy using an addition agent, wherein the addition agent (37) is deposited in a local cavity (10) arranged at the bottom of a treatment ladle (2) and surrounded by a small protruding wall (11), and a closing member (13) connected to movement means (14) is able to form, with the bottom of the treatment ladle, in a low insulating position, a chamber (25) including said local cavity and comprising an intermediate annular space (25a) around the small wall. Application to the treatment of a molten cast iron using pure magnesium or a magnesium alloy.
Claims11
A process for treating a molten metal or metal alloy using an additive agent, comprising:
- depositing the additive agent (37) in at least one local cavity (10) made in the bottom of a treatment ladle (2) and delimited by a low annular wall (11) that protrudes with respect to this bottom,
- lowering down to a bottom position at least one closure member (13) comprising a closure bell (17) so that this closure bell surrounds, at a distance, said low wall and so that its frontal edge bears against the bottom (4) of the treatment ladle (2), creating an annular bearing zone (23) around and at a distance from the low wall (11) and that is located below the upper edge of the low wall, forming a chamber (25) that includes said local cavity (10),
- at least partially filling the treatment ladle with the molten metal (38),
- raising the closure member (13) so as to bring the molten metal and the additive agent into contact.
A device for treating a molten metal or metal alloy using an additive agent, comprising a treatment ladle (2), wherein at least one local cavity (10) is made in the bottom (4) of the treatment ladle (2) and that comprises added equipment (12) comprising at least one closure member (13) and displacement means (14;
- 39) for moving this closure member to and from a bottom position for isolating or closing said local cavity (10);
- wherein the bottom (4) of the treatment ladle (2) has a protruding low annular wall (11) that delimits said local cavity (10)
- and wherein the lower portion of the closure member (13) comprises a closure bell (17) which, in said bottom position, is capable of surrounding, at a distance, said low wall and the frontal edge of which, in said bottom position, is capable of bearing against the bottom (4) of the treatment ladle (2), creating an annular bearing zone (23) around and at a distance from the low wall (11) and that is located below the upper edge of the low wall, so as to form a chamber (25) that includes said local cavity (10).
Dependencies are inferred from the claim text.