CONTINUOUS SMELTING AND REFINING OF IRON

The production of iron product uses a top-submerged lancing injection reactor system, having a reactor for containing a molten iron bath having a slag phase, and first and second top-submerged injection lances positioned in the reactor for top-submerged injection into the bath. The lances are at mut...

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Bibliographische Detailangaben
Hauptverfasser: WORNER, HOWARD, KNOX, FLOYD, JOHN, MILLICE
Format: Patent
Sprache:eng ; fre
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Zusammenfassung:The production of iron product uses a top-submerged lancing injection reactor system, having a reactor for containing a molten iron bath having a slag phase, and first and second top-submerged injection lances positioned in the reactor for top-submerged injection into the bath. The lances are at mutually spaced locations, such as with the first closer to a slag tapping region and the second closer to an iron product tapping region. With a molten bath having a molten iron phase, containing sulphur and phosphorous, and a molten slag phase in the reactor, free-oxygen-containing gas and fuel/reductant are injected into the slag, through each lance, at a respective ratio of free-oxygen to fuel/reductant. Additional reductant is charged to the slag through a charging port. The ratio of free-oxygen to fuel/reductant injected through each lance and the charging of further reductant are controlled whereby a respective reducing region is generated in the vicinity of second lance, and reducing conditions are provided substantially throughout the slag. The injecting and controlling of the respective ratios are maintained whereby more strongly reducing conditions are provided in the region in the vicinity of the first lance and less strongly reducing conditions are provided in the region in the vicinity of the second lance. Sulphur in the molten iron is taken-up by the slag, and iron in the slag is reduced, in the vicinity of the first lance, and phosphorous in the molten iron is taken-up by the slag in the vicinity of the second lance, thereby producing iron product having a reduced level of both sulphur and phosphorus. On produit du fer au moyen d'un système de réacteur à lances d'injection immergées par le haut, ledit réacteur contenant un bain de fer fondu ayant une phase de scories, et une première et une seconde lances d'injection immergées par le haut étant positionnées dans ledit réacteur de façon à permettre l'injection immergée par le haut à l'intérieur du bain. Les lances sont distantes l'une de l'autre, disposées de telle sorte que la première est plus proche d'une région de coulée des scories et la seconde est plus proche d'une région de coulée du fer. Le bain fondu comportant d'une part une phase de fer fondu contenant du soufre et du phosphore et d'autre part une phase de scories fondue au sein du réacteur, on injecte du gaz contenant de l'oxygène libre et un carburant/réducteur à l'intérieur des scories, par l'intermédiaire de chacune des lances, suivan