Process for the direct reduction of iron oxide-containing materials in a rotary kiln

US4181520A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Gerhard Reuter · Ismaning, DE
• Wolfram Schnabel · Idstein, DE

Key dates

• Filing date: Oct 19, 1978
• Grant date: Jan 1, 1980
• Expiry date: Oct 19, 1998

Classification

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

Abstract

Iron oxide-containing materials, such as iron ores, are directly reduced to produce sponge iron by a treatment with solid carbonaceous reducing agents in a rotary kiln at temperatures below the softening and melting point of the charge wherein the kiln atmosphere flows opposite to the direction of movement of the charge. At least part of the solid carbonaceous reducing agent is charged in an agglomerated form into the rotary kiln at the charging end thereof and oxygen containing gases are fed into the rotary kiln. A highly reactive, solid carbonaceous reducing agent containing 20-50% volatile constituents are charged in agglomerated form into the rotary kiln the charging end thereof and are heated up at such a rate that the reducing agent disintegrates into fine particles substantially in and before the end of the heating-up zone of the rotary kiln.