Process for producing sponge iron

Details Process for producing sponge iron Process for producing sponge iron

C - Chemistry, Metallurgy

21

B

C21B 13/14 (2006.01) C22B 5/14 (2006.01)

Patent

CA 2242249

A process is disclosed for producing sponge iron by direct reduction of particulate, iron oxide-containing materials. A reduction gas formed in a melting-gasification zone from carbon-yielding materials and oxygen-containing gas is introduced into a reduction zone in which the iron oxide-containing materials are located. The process has the following characteristics: a reduction gas which contains from 20 to 100 g dust per Nm3 with a carbon content from 30 to 70 % by mass is introduced into the reduction zone; and the iron oxide-containing materials are exposed to the reduction gas for a period of time longer than that required to finish reduction. This process is suitable for producing sponge iron with an increased carbon content.

Ce procédé sert à produire de l'éponge de fer par réduction directe de matériaux particulaires contenant des oxydes de fer. On introduit dans une zone de réduction dans laquelle se trouvent les matériaux contenant des oxydes de fer un gaz de réduction formé dans une zone de fusion et de gazéification à partir de matières carbonifères et de gaz contenant de l'oxygène. Ce procédé présente les caractéristiques suivantes: on introduit dans la zone de réduction un gaz de réduction qui contient par Nm?3¿ entre 10 et 100 g de poussières d'une teneur en carbone comprise entre 30 et 70 % en masse, et on expose les matériaux contenant des oxydes de fer au gaz de réduction pendant une durée supérieure à celle qui serait nécessaire pour achever la réduction. Ce procédé permet de produire de l'éponge de fer d'une teneur accrue en carbone.

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