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

C - Chemistry – Metallurgy – 10 – J

Patent

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

Patent

CA 2259861

In a method for producing a hot CO- and H2-containing reducing gas serving for the reduction of lumpy metal ore, in particular iron ore, the reducing gas is formed in a gasification zone (8) by a gasification of carbon carriers, in particular coal, taking place under the supply of oxygen and subsequently is cooled down to a reducing-gas temperature favorable to the reduction process. In order to produce a thermodynamically more stable reducing gas, the reducing gas by the addition of H2O and/or CO2 - in order to prevent the Boudouard and heterogeneous water-gas reaction and a resultant heating of the reducing gas - is converted to a reducing gas that is thermodynamically more stable at the reducing-gas temperature.

L'invention concerne un procédé de production d'un gaz réducteur chaud, renfermant CO et H2, et servant à la réduction de minerai métallique en morceaux, 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 (8) 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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