Direct reduction process for iron oxide-containing materials

Details Direct reduction process for iron oxide-containing materials Direct reduction process for iron oxide-containing materials

C - Chemistry, Metallurgy

21

B

C21B 13/00 (2006.01)

Patent

CA 2193855

A direct reduction process is disclosed for iron oxide-containing materials. Synthesis gas is mixed with top gas produced during direct reduction of the iron oxide-containing materials and is used as reduction gas for directly reducing and heating the iron oxide-containing materials up to reduction temperature. In order to set the H2S content at a predetermined value by a relatively simple technique and with a relatively simple equipment, at least part of the sulphur contained in the iron oxide-containing materials as H2S produced during heating or direct reduction is added to the reduction gas together with the top gas.

Selon un procédé de réduction directe de matériaux contenant de l'oxyde de fer, on mélange du gaz de synthèse avec le gaz de gueulard produit lors de la réduction directe des matériaux contenant de l'oxyde de fer et on l'utilise comme gaz réducteur afin de réduire directement et chauffer les matériaux contenant de l'oxyde de fer jusqu'à la température de réduction. Afin de régler la teneur en H¿2?S sur une valeur prédéterminée sans grandes complexités techniques et avec un équipement simple, au moins une partie du soufre contenu dans les matériaux contenant de l'oxyde de fer et qui se présente sous forme de H¿2?S produit pendant le chauffage ou la réduction directe est ajoutée au gaz de réduction avec le gaz de gueulard.

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