Method for reducing oxidic iron ores in a rotary kiln

US4581061A · kind A · utility

Assignee

• Fried Krupp · DE

Inventors

• Klaus Ulrich · Heiligenhaus, DE
• Wilhelm Janssen · Saterland, DE

Key dates

• Filing date: Sep 6, 1984
• Grant date: Apr 8, 1986
• Expiry date: Sep 6, 2004

Classification

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

Abstract

In a reduction process carried out in a rotary kiln in which oxygen-containing gases are introduced by way of nozzles and at least a part of the highly volatile solid reductants are introduced from the discharge end so as to be distributed over a substantial region of the kiln bed, and any remaining balance of the reductants is fed jointly with the ore and the additives at the feed end, the formation of fusion deposits is prevented by the introduction of at least 60% of the reductants via the discharge end, and that at least a 60% portion of the reductants includes no more than 20% of the total reductant particulates having less than a 3 mm particle size.