Carbothermic aluminium production using scrap aluminium as...

C - Chemistry – Metallurgy – 22 – B

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C22B 21/02 (2006.01) C22B 5/10 (2006.01) C22B 9/02 (2006.01) C22B 21/06 (2006.01)

Patent

CA 2358070

A process for producing aluminum metal by carbothermic reduction of alumina ore. Alumina ore is heated in the presence of carbon at an elevated temperature to produce an aluminum metal body contaminated with about 10-30 % by wt. aluminum carbide. Aluminum metal or aluminum alloy scrap then is added to bring the temperature to about 900-1000 °C and precipitate out aluminum carbide. The precipitated aluminum carbide is filtered, decanted, or fluxed with salt to form a molten body having reduced aluminum carbide content.

La présente invention concerne un procédé de production de métal d'aluminium par réduction carbothermique de minerai d'oxyde d'aluminium. Le minerai d'oxyde d'aluminium est chauffé en présence de carbone à température élevée pour produire un corps en métal d'aluminium contaminé avec environ 10-30 % en poids de carbure d'aluminium. Un métal d'aluminium ou un rebut d'alliage d'aluminium est alors ajouté pour que la température monte à environ 900-1000 DEG C et que le carbure d'aluminium soit rejeté par précipitation. Le rejet de carbure d'aluminium est filtré, décanté, ou enrobé de sel pour former un corps fondu à teneur réduite en carbure d'aluminium.

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