Method and equipment for treatment of molten aluminium metal
AssigneeNorsk Hydro ASA
InventorsInge JOHANSEN, Shahid AKHTAR, Alf Inge ROMFO, Roy Arne CHRISTIANSEN, Jon NYGARD
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Abstract
A method and an equipment for the treatment of molten aluminium metal, in particular Na removal in a tapping/transport crucible (1) provided with a lid (6). The atmosphere above the molten metal is sub-pressurized to a sub pressure between 300-10 mbar and subsequently exposed to a stirring action generated by an electromagnetic coil (EMS) arranged towards one side of the tapping/transport crucible (1), whereby Na can be removed from the molten aluminium metal without any addition of active or passive agents.
Claims13
1-12. (canceled)
A method for the treatment of molten aluminium metal for Na removal in a tapping/transport crucible (1) by generating a stirring action of the molten aluminium metal, the tapping/transport crucible (1) has a mantle wall of a material that allows an electromagnetic field generated by an electromagnetic coil (EMS) brought in vicinity of said material to generate a stirring action of the molten aluminium metal inside the tapping/transport crucible (1) when energizing the electromagnetic coil (EMS),
- wherein
- the tapping/transport crucible (1) is adapted to fit a lid (6) or cover in a substantial air tight manner where the lid is provided with means for continuously evacuating the atmosphere below the lid to a sub pressure between 300-10 mbar during stirring of the aluminium metal, where Na is removed from said space without application of fluxing agents.
Equipment for the treatment of molten aluminium metal for Na removal in a tapping/transport crucible (1) and generating a stirring action, the crucible comprises an outer mantle wall (4), arranged adjacent an electromagnetic coil (EMS) in the metal treatment equipment and that a stirring action of the molten aluminium metal takes place by energizing the electromagnetic coil,
- wherein
- the tapping/transport crucible (1) is provided with a lid (6) or cover having means for tightly adapt to it and further having means for continuously evacuating the atmosphere below the lid to a sub pressure between 300-10 mbar during the stirring of the aluminium metal for removal of Na without application of fluxing agents.
Dependencies are inferred from the claim text.