Arrangement and method for reducing build-up on a roasting...

Details Arrangement and method for reducing build-up on a roasting... Arrangement and method for reducing build-up on a roasting...

C - Chemistry, Metallurgy

22

B

C22B 1/10 (2006.01) B01J 8/44 (2006.01) C22B 19/02 (2006.01) F23C 10/20 (2006.01) F27B 15/00 (2006.01) F27B 15/02 (2006.01) F27D 25/00 (2010.01)

Patent

CA 2439901

The present invention relates to an arrangement and method that help to reduce the build-up formed on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster furnace from the wall of the furnace, and oxygen-containing gas is fed via gas jets under the grate in the bottom of the furnace in order to fluidize the concentrate and oxidize it during fluidization. Below the concentrate feed point, or feed grate, the oxygen content of the gas to be fed is raised compared with gas fed elsewhere using additional gas jets situated in the feed grate higher than the other jets. The extra jets of the feed grate are connected to their own gas distribution unit.

L'invention porte sur un dispositif et un procédé contribuant à réduire les accumulations se formant sur la grille d'un four à lit fluidisé lors du grillage de matériaux à granulométrie fine tels que des concentrés. Un tel concentré est introduit dans le four de grillage à partir de l'une de ses parois, tandis que le gaz contenant de l'oxygène est projeté en jets sous la grille depuis la base du four de manière à fluidiser le concentré et à l'oxyder pendant la fluidisation. Sous le point d'introduction du concentré ou sous la grille d'alimentation, la teneur en oxygène du gaz d'apport est plus élevée que celle du gaz injecté dans les autres parties à l'aide de jets de gaz additionnels situés dans la grille d'apport plus haut que les autres jets. Les jets supplémentaires de la grille d'alimentation sont reliés à leur propre unité de distribution.

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