Process for recycling aluminium alloy scrap coming from the...

C - Chemistry – Metallurgy – 22 – B

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C22B 21/06 (2006.01) C22B 9/02 (2006.01)

Patent

CA 2654159

Process for manufacturing an aluminium-based reflow block intended for producing an aluminium alloy for the aeronautical industry, in which: (i) scrap containing predominantly aluminium alloys used in the aeronautical industry is supplied in a supply step; (ii) said scrap is melted in a melting furnace so as to obtain an initial liquid metal bath in a melting step; (iii) the initial liquid metal bath is made to undergo a purification by fractional crystallization so as to obtain a solidified mass and a residual liquid bath in a segregation step; and (iv) the solidified mass is recovered so as to obtain a reflow block in a recovery step. The invention is particularly useful for recycling aluminium alloys used in the aeronautical industry, as it makes it possible in particular to purify, in terms of iron and silicon, scrap made of alloys of the 2XXX series or 7XXX series, without however removing the additional elements such as zinc, copper and magnesium.

Procédé de fabrication d'un bloc de refusion à base d'aluminium destiné à l'élaboration d'alliage d'aluminium pour l'industrie aéronautique dans lequel (i) on approvisionne du scrap contenant majoritairement des alliages d'aluminium utilisés dans l'industrie aéronautique pendant une étape d'approvisionnement ; (ii) on fait fondre ledit scrap dans un four de fusion de façon à obtenir un bain de métal liquide initial pendant une étape de fusion ; (iii) on fait subir au bain de métal liquide initial une purification par cristallisation fractionnée de façon à obtenir une masse solidifiée et un bain de liquide résiduel pendant une étape de ségrégation ; (iv) on récupère la masse solidifiée de façon à obtenir un bloc de refusion pendant une étape de récupération. L'invention est particulièrement utile pour le recyclage des alliages d'aluminium utilisés dans l'industrie aéronautique car il permet en particulier de purifier en fer et en silicium le scrap d'alliages de la série 2XXX ou de la série 7XXX, sans toutefois éliminer les éléments d'addition tels que le zinc, le cuivre et le magnésium.

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