Process of recovering molten pig iron or steel pre-products from lumpy iron-oxide and scrap using a fluidized bed

US4895593A · kind A · utility

Assignee

• Korf Engineering GmbH · DE

Inventors

• Horst Sulzbacher · Leoben, AT
• Markus Hubig · Aachen, DE

Key dates

• Filing date: Jul 20, 1988
• Grant date: Jan 23, 1990
• Expiry date: Jul 20, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This is disclosed a process of recovering molten pig iron or steel pre-products from lumpy iron-oxide containing charging substances. The charging substances are reduced to sponge iron in a direct reduction zone, the sponge iron is smelted in a meltdown gasifying zone under supply of carbon carriers and oxygen-containing gas forming a coal fluidized bed, and CO and H.sub.2 containing reduction gas is produced, which is injected into the direct reduction zone and reacted there. For the commercial utilization of low-quality scrap grades, such as, e.g., automotive scrap, PA1 (a) scrap is charged into the meltdown gasifying zone in addition to sponge iron, PA1 (b) the scrap has an apparent weight of between 300 and 1000 kg/m.sup.3, preferably between 400 and 600 kg/m.sup.3, and PA1 (c) the temperature of the coal fluidized bed is maintained at 1,500.degree. to 1,700.degree. C., The scrap passes the coal fluidized bed, is carbonized and is smelted by maintaining reducing conditions, and possibly present organic impurities are pyrolyzed.