In-line salt refining of molten aluminium alloys
AssigneeRio Tinto Alcan International Limited
InventorsClaude Dupuis, Carl Lakroni, Peter Waite
Life of this patent
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Abstract
The present invention describes an apparatus and a process for in-line substantially continuous degassing of aluminium and/or aluminium alloys, in absence of chlorine and through the injection of at least one metal halide salt that includes a halogen and water and an inert gas, in a transfer trough before casting.
Claims18
An in-line process for refining a molten aluminium or aluminium alloy flowing from an inlet to an outlet, the molten aluminium or aluminium alloy having a metal liquid level, the process comprising:
- adding an inert gas and at least one metal halide salt into the molten aluminium or aluminium alloy, below the metal liquid level at an upstream disperser;
- dispersing the inert gas and the at least one metal halide salt into the flowing molten aluminium or aluminium alloy with the upstream disperser,
- adding only inert gas into the molten aluminium or aluminium alloy below the metal liquid level at a downstream disperser;
- and
- dispersing the inert gas into the flowin molten aluminium or aluminium alloy with the downstream disperser.
An in-line process for refining a molten aluminium or aluminium alloy flowing through a trough from an inlet to an outlet, the molten aluminium or aluminium alloy having a metal liquid level, the process comprising:
- adding an inert gas and at least one metal halide salt into the molten aluminium or aluminium alloy flowing through the trough, below the metal liquid level at an upstream disperser;
- dispersing the inert gas and the at least one metal halide salt into the flowing molten aluminium or aluminium alloy with the upstream disperser,
- adding only inert gas into the molten aluminium or aluminium alloy flowing through the trough, below the metal liquid level at a downstream disperser;
- and
- dispersing the inert gas into the flowing molten aluminium or aluminium alloy with the downstream disperser.
Dependencies are inferred from the claim text.