Process and plant for producing metal oxide from metal salts

Details Process and plant for producing metal oxide from metal salts Process and plant for producing metal oxide from metal salts

B - Operations, Transporting

01

J

B01J 8/24 (2006.01) B01J 6/00 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2747370

The present invention relates to the production of metal oxide from metal salts, in particular from aluminum hy-droxide, wherein the metal salt is dried in a drying means, preheated in at least one preheating stage, and calcined to metal oxide in a fluidized-bed reactor, and wherein the metal oxide obtained then is cooled. To reduce the energy demand of a calcining plant, the metal salt is cleaned in at least one filter before being dried and steam formed in the drying means is recirculated into the filter.

La présente invention concerne un procédé de production d'oxyde métallique à partir de sels métalliques, en particulier à partir d'hydroxyde d'aluminium, lequel procédé consiste à sécher le sel métallique dans un moyen de séchage, le préchauffer dans au moins une étape de préchauffage, et le calciner en oxyde métallique dans un réacteur à lit fluidisé, puis refroidir l'oxyde métallique obtenu. Pour réduire les besoins énergétiques de l'installation de calcination, le sel métallique est nettoyé dans au moins un filtre avant d'être séché, et la vapeur formée dans le moyen de séchage est remise en circulation dans le filtre.

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