Process for production of aluminum ingots, aluminum ingots,...

B - Operations – Transporting – 22 – D

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B22D 21/04 (2006.01)

Patent

CA 2633751

To provide a method for producing an aluminum ingot whose oxides is reduced by preventing the surface of molten aluminum from being oxidized. The method according to the present invention includes a melting step (melting furnace 1) of melting an aluminum base metal into a molten aluminum or molten aluminum alloy; a holding step (holding furnace 2) of holding the resulting molten aluminum or molten aluminum alloy; a dehydrogenation step ( dehydrogenation unit 3) of removing hydrogen gas from the molten aluminum or molten aluminum alloy; a filtration step (filter 4) of removing inclusions from the molten aluminum or molten aluminum alloy; and a casting step (casting device 5) of solidifying the molten aluminum or molten aluminum alloy into a predetermined shape, wherein at least one of the above steps is conducted in the atmosphere of a protective gas containing fluorinating gas, carbon dioxide gas, and nitrogen and/or argon gas.

L'invention concerne un processus de fabrication de lingots d'aluminium dont la teneur en oxydes est abaissée en empêchant l'oxydation superficielle de l'aluminium fondu, plus précisément, un processus de fabrication de lingots d'aluminium ou d'alliages d'aluminium comprenant une étape de fusion (four de fusion (1)) consistant à faire fondre du métal d'aluminium en aluminium fondu, une étape de maintien à température élevée (four de maintien à température élevée (2)) consistant à maintenir à température élevée l'aluminium fondu, une étape de déshydrogénation (unité de déshydrogénation (3)) consistant à retirer le gaz hydrogène de l'aluminium fondu, une étape de filtration (filtre (4)) consistant à retirer les inclusions de l'aluminium fondu, et une étape de coulage (équipement de coulage (5)) consistant à solidifier l'aluminium fondu résultant selon une forme prescrite, au moins l'une des étapes ci-dessus étant réalisée dans l'atmosphère d'un gaz de protection comprenant un gaz de fluorination, un gaz de dioxyde de carbone, et un gaz d'azote et/ou d'argon.

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