Process and plant for the production of iron, in particular...

C - Chemistry – Metallurgy – 21 – B

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Details

C21B 13/00 (2006.01) C21B 13/12 (2006.01) C21B 13/14 (2006.01)

Patent

CA 2345470

The invention relates to a method for producing iron, especially steel, from ferriferous oxides. According to said method, an H2 smelting reduction is carried out in a smelting vessel (1) and H2-containing gas and energy are supplied. The ferriferous oxides are preheated and prereduced in at least one preheating and prereduction area (11a) using a gas containing H2 and H2O, which is drawn out of the smelting vessel (1) and then conveyed to the preheating and prereduction area (11a), optionally after a gas containing more than 50 %, preferably more than 90 % H2 has been added. The preheated and prereduced ferriferous oxides are then introduced into the smelting vessel (1), where they are melted down and the reduction is completed using a gas containing more than 50 %, preferably more than 90 % H2. This maximises the degree of utilization of the thermal and chemical potential of the H2- containing gas used for the smelting reduction process and minimises the quantity of energy supplied from outside.

L'invention concerne un procédé permettant de produire du fer, notamment de l'acier, à partir d'oxydes de fer. Le procédé consiste en une réduction-fusion par l'hydrogène, mise en oeuvre dans une cuve de fusion (1), avec apport d'un gaz contenant de l'H¿2? et d'énergie. Selon le procédé, les oxydes de fer sont préchauffés et préréduits dans au moins une zone de préchauffage et de préréduction (11a) au moyen d'un gaz contenant de l'H¿2? et de l'H¿2?O, qui est retiré de la cuve de fusion (1) et amené dans ladite zone, éventuellement après ajout d'un gaz contenant plus de 50 %, de préférence plus de 90 %, de H¿2?; puis les oxydes de fer préchauffés et préréduits sont introduits dans la cuve de fusion (1), où la fusion et la réduction sont achevées au moyen d'un gaz contenant plus de 50 %, de préférence plus de 90 %, de H¿2?. Le procédé optimise le taux d'utilisation du potentiel thermique et chimique du gaz contenant du H¿2? utilisé pour la réduction-fusion et minimise la quantité d'énergie amenée de l'extérieur.

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