Direct-reduction process carried out in a rotary kiln

US4179280A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Gerhard Reuter · Ismaning, DE
• Wolfram Schnabel · Idstein, DE
• Harry Serbent · Hanau, DE

Key dates

• Filing date: Apr 20, 1978
• Grant date: Dec 18, 1979
• Expiry date: Apr 20, 1998

Classification

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

Abstract

A process for directly reducing iron oxide-containing materials to provide sponge iron by heating said iron oxide-containing materials in a rotary kiln while employing a solid carbonaceous reducing agent having a high content of volatile combustible components, wherein oxygen-containing gases are injected into the rotary kiln at a controlled rate through shell pipes into the free kiln space and the charge is moved through the rotary kiln countercurrently to the flow of the kiln atmosphere, is described. The invention lies in injecting oxygen-containing gases at controlled rates through nozzle blocks into the charge disposed over said nozzle blocks and in injecting oxygen-containing gases at controlled rates through shell pipes into the free kiln space in that region of the heating-up zone defined by a point along the length of the heating-up zone where ignitable particles of the solid reducing agent first appear and a second point before the reducing zone.