Process of producing sponge iron by a direct reduction of iron oxide-containing material in a rotary kiln

US4469509A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Karl-Heinz Fischer · Laatzen, DE
• Wolfram Schnabel · Idstein, DE
• Harry Serbent · Hanau, DE

Key dates

• Filing date: Sep 14, 1982
• Grant date: Sep 4, 1984
• Expiry date: Sep 14, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/134
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the operation of the rotary kiln provided at its charging end with a central burner, solid reducing agents having a high content of volatile constituents are used and the charge and the gas atmosphere are conducted in cocurrent streams. To avoid a high heat load per unit of volume in the heating-up zone and yet to increase the heating-up rate, a solid carbonaceous reducing agent having a high content of volatile constituents is charged together with the iron oxide-containing material into the charging end of the rotary kiln, oxygen-containing gases are blown through nozzle blocks into the free gas space and into the charge in the heating-up zone, and oxygen-containing gases are blown through nozzle blocks into the free kiln space in the reducing zone.