Method using selected carbons to react with al2o and al...

C - Chemistry – Metallurgy – 22 – B

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

Patent

CA 2548041

In a method for recovering Al from an off-gas (3,4) produced during carbothermic reduction of aluminum utilizing at least one smelter (1,2), the off-gas (3,4) is directed to an enclosed reactor (5) which is fed a supply of wood charcoal (7) having a porosity of from about 50 vol.% to 85 vol.% and an average pore diameter of from about 0.05 ~m to about 2.00 ~m, where the wood charcoal (7) contacts the off-gas (3,4) to produce at least Al4C3 (6), which is passed back to the smelter (1,2).

La présente invention a trait à un procédé de récupération d'aluminium à partir d'un gaz résiduel (3, 4) produit lors d'une réduction carbothermique d'aluminium utilisant au moins un four de fusion (1, 2), dans lequel le gaz résiduel (3, 4) est dirigé vers un réacteur clos (5) qui est pourvu d'une alimentation de charbon de bois (7) présentant une porosité d'environ 50 % en volume à 85 % en volume et un diamètre de pores moyen compris entre environ 0,05 µm et environ 2,00 µm, dans lequel le charbon de bois (7) entre en contact avec le gaz résiduel (3, 4) pour produire au moins Al¿4?C¿3? (6), qui est recyclé vers le four de fusion (1, 2).

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