Process for producing a reduction gas for reduction of metal...

Details Process for producing a reduction gas for reduction of metal... Process for producing a reduction gas for reduction of metal...

C - Chemistry, Metallurgy

10

J

C10J 3/16 (2006.01) C10J 3/20 (2006.01) C21B 13/00 (2006.01) C21B 13/14 (2006.01)

Patent

CA 2260207

In a process for producing a hot reduction gas containing Co and H2 for reducing fine-grained metal ore, particularly iron ore, the reduction gas is formed by gasification of carbon-containing materials, particularly coal, under addition of oxygen in a gasification zone and subsequently cooled to a reduction gas temperature conducive to the reduction process. To produce a reduction gas of greater thermodynamic stability, H2O and/or CO2 are added to eliminate the Boudouard and heterogeneous water gas reaction and teh concomitant warming of the reduction gas.

L'invention concerne un procédé de production d'un gaz réducteur chaud, renfermant CO et H2, et servant à la réduction de minerai métallique à grains fins, notamment de minerai de fer. Ledit procédé consiste à former le gaz réducteur par gazéification, avec apport d'oxygène, de substances contenant du carbone, notamment de charbon, dans une zone de gazéification et à le refroidir ensuite à une température favorable pour le processus de réduction. Afin d'obtenir un gaz réducteur présentant une meilleure stabilité thermodynamique, on ajoute du H2O et/ou CO2 pour empêcher la réaction de Boudouard et la réaction du gaz à l'eau hétérogène et éviter par conséquent un réchauffement concomitant du gaz réducteur.

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