A direct smelting process

Details A direct smelting process A direct smelting process

C - Chemistry, Metallurgy

21

B

C21B 11/00 (2006.01) C21B 11/02 (2006.01) C21B 13/00 (2006.01) C21C 5/56 (2006.01) C21C 7/00 (2006.01) C22B 5/10 (2006.01) C22B 5/12 (2006.01) F27B 3/08 (2006.01) F27B 3/22 (2006.01) F27B 19/02 (2006.01) F27B 19/04 (2006.01) F27D 3/18 (2006.01) C21C 5/46 (2006.01) F27B 3/04 (2006.01) F27B 3/19 (2006.01) F27D 3/00 (2006.01) F27D 9/00 (2006.01)

Patent

CA 2341898

A direct smelting process for producing metal from a metalliferous feed material is disclosed. The direct smelting process is a molten bath-based process in which smelting occurs predominantly in the metal layer, carrier gas/metalliferous feed material/solid carbonaceous material are injected into the metal layer via lances/tuyeres, and oxygen-containing gas is injected into the top space above the molten bath and post-combusts reaction gases released from the bath. The injection of metalliferous feed material and solid carbonaceous material causes molten material to be projected from the molten bath as splashes, droplets and streams and to form a transition zone. The process is characterised by forming a pipe of a solid material on an outlet end of at least one lance/tuyere while injecting the metalliferous feed material and the carbonaceous material through the lances/tuyeres and thereby extending the effective length of the lance/tuyere or the lances/tuyeres.

L'invention concerne un procédé de fusion directe permettant de produire du métal à partir d'une matière de charge métallifère. Le procédé de fusion directe est un procédé sur la base d'un bain fondu dans lequel la fusion s'effectue principalement dans la couche métallique, un gaz vecteur/matière de charge métallifère/matière carbonée solide étant injecté dans la couche métallique au moyen de lances/tuyères, un gaz oxygéné étant injecté dans l'espace au-dessus du bain fondu et le bain rejetant des gaz de réaction postcombustion. L'injection d'une matière de charge métallifère et d'une matière carbonée solide provoque la projection, sous forme d'éclaboussures, de gouttelettes et de flux, d'une matière fondue provenant du bain fondu et formant une zone de transition. Le procédé consiste à poser un tuyau de matière solide à une extrémité de sortie d'au moins une lance/tuyère, tout en injectant la matière de charge métallifère et la matière carbonée dans les lances/tuyères, ce qui augmente la longueur effective de la lance/tuyère ou des lances/tuyères.

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