Method for processing aluminium in a rotary or reverberating...

F - Mech Eng,Light,Heat,Weapons – 27 – B

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F27B 7/20 (2006.01)

Patent

CA 2557288

The invention relates to a method for processing aluminium in a furnace consisting in introducing an aluminium-containing material and possibly one or several types of salt into the furnace, melting said material by heating with the aid of at least one burner supplied with a combustive material and fuel in such a way that a molten aluminium possibly covered with a slag containing, in particular alumina and at least one salt is produced and in measuring a carbon monoxide and/or hydrogen concentration in the furnace atmosphere or in a smoke at the exit of the furnace. Oxygen content in the combustive material supplying at least one burner is greater than 10 % by volume, preferably greater than 21 % by volume. The inventive method also involves a final phase of reduction of the molten aluminium oxydation during which the fuel flow rate is substantially constant while the injected combustive flow rate is controlled at a value ranging from 3 to 15 % by volume which is greater than a CO concentration in the furnace and/or in the smoke without control.

L'invention concerne un procédé de traitement d'aluminium dans un four dans lequel on introduit dans le four un matériau contenant de l'aluminium et éventuellement un ou plusieurs sels, on réalise la fusion de ce matériau par apport de chaleur à l'aide d'au moins un brûleur alimenté en comburant et en combustible, de manière à obtenir de l'aluminium fondu éventuellement recouvert d'un laitier comportant notamment de l'alumine et au moins un sel, et on mesure la concentration en monoxyde de carbone et/ou en hydrogène dans l'atmosphère du four ou dans les fumées en sortie du four. Le comburant qui alimente au moins un brûleur comporte plus de 10% volume d'oxygène, de préférence plus de 21% vol. d'oxygène, et le procédé comporte une phase finale de réduction de l'oxydation de l'aluminium fondu au cours de laquelle le débit de comburant est sensiblement constant tandis que le débit de combustible injecté dans au moins un brûleur est fonction de la concentration en monoxyde de carbone régulée à une valeur comprise entre 3% et 15% vol., supérieure à la concentration en CO dans le four et/ou les fumées en absence de régulation.

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