Process for the direct reduction of iron-oxide-containing...

C - Chemistry – Metallurgy – 21 – B

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C21B 13/00 (2006.01)

Patent

CA 2388847

The invention relates to a method for direct reduction of materials containing iron oxide using a reduction gas containing CO and H2 in at least one fluidized bed reduction zone, whereby the used reduction gas containing CO2 coming out of the at least one fluidized bed reduction zone is recirculated and a fresh reduction gas is produced by CO2 reforming of the used reduction gas and a gas containing methane, especially natural gas. CO2 reforming and direct reduction are carried out at a pressure of at least 4 bar overpressure in order to substantially prevent carbon formation and deposition and in order to keep the size of the reactor receiving the reduction zone small, whereby the reduction zone is exposed to an amount of reduction gas complying with metallurgical requirements.

La présente invention concerne un procédé permettant la réduction directe de matériaux contenant de l'oxyde de fer au moyen d'un gaz réducteur contenant du CO et du H¿2? dans au moins une zone de réduction à lit fluidisé, le gaz réducteur utilisé sortant de la/des zone(s) de réduction et contenant du CO¿2? étant recyclé, et le gaz de réduction recyclé, obtenu par reformage du CO¿2? du gaz de réduction utilisé, et d'un gaz contenant du méthane, en particulier du gaz naturel, est produit. Dans ledit procédé, le reformage du CO¿2? et la réduction directe sont réalisés à une pression d'au moins 4 bar de surpression, ce qui permet d'éviter au maximum la formation de carbone et l'apparition de dépôts, et de réduire la taille du réacteur dans lequel se trouve la zone de réduction, ladite zone de réduction contenant cependant une quantité de gaz réducteur suffisante pour répondre aux exigences de métallurgie.

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