Feed processing for improved alumina process performance

Details Feed processing for improved alumina process performance Feed processing for improved alumina process performance

C - Chemistry, Metallurgy

01

F

C01F 7/44 (2006.01) C01F 7/06 (2006.01) C22B 1/02 (2006.01) C22B 1/26 (2006.01) C22B 21/00 (2006.01) F26B 3/06 (2006.01) F26B 3/18 (2006.01)

Patent

CA 2340971

A process is disclosed for the treatment of an alumina process feedstock prior to transferring the treated feedstock to an alumina process for extracting refined alumina from the treated feedstock. The treatment process includes the following steps: (a) heating the alumina process feedstock to a temperature of 400 ~C to 650 ~C by direct contact with combustion gases; and (b) cooling the heated feedstock to a temperature at which it can be handled and fed to the alumina process. The treatment process is characterised by controlling the contact time of the solid alumina process feedstock at temperatures in the above range in step (a) to less than 5 minutes.

L'invention concerne un procédé pour le traitement d'une charge d'alimentation pour le traitement de l'oxyde d'aluminium avant le transfert de la charge d'alimentation traitée à un système de traitement de l'oxyde d'aluminium en vue de l'extraction de ce dernier raffiné à partir de la charge traitée. Le procédé de traitement comprend les étapes suivantes consistant à: (a) chauffer la charge d'alimentation d'oxyde d'aluminium à une température comprise entre 400 et 650 ·C par contact direct avec les gaz de combustion, et (b) refroidir la charge d'alimentation chauffée à une température à laquelle elle peut être manutentionnée et transmise au traitement de l'oxyde d'aluminium. Ce traitement se caractérise en ce qu'il consiste à commander le temps de contact de la charge d'alimentation de l'oxyde d'aluminium solide à des températures comprises dans la plage mentionnée en (a) pendant moins de 5 minutes.

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