Process for hot briqueting granular sponge iron

US6074456A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Jochen Freytag · Usingen, DE
• Helmut Hausmann · Babenhausen, DE
• Martin Hirsch · Friedrichsdorf, DE
• Siegfried Schimo · Friedrichsdorf, DE
• Michael Ströder · Neu-Anspach, DE
• Peter Weber · Delmar, US

Key dates

• Filing date: Dec 21, 1998
• Grant date: Jun 13, 2000
• Expiry date: Dec 21, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B1/24
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The granular sponge iron is supplied to a roller press at temperatures of 600 to 850.degree. C. for molding the hot briquets. There is produced a strip structure of sponge iron containing formed hot briquets, which are arranged at a distance from each other. By smashing the strip structure, the hot briquets are separated from each other, so that fragments of the strip structure are obtained. The hot briquets and at least part of the fragments are cooled to temperatures in the range from 20 to 400.degree. C., and the cooled briquets and fragments are passed through a rotary drum. In the rotary drum, fine-grained fines of the briquets and fragments are produced. Subsequently, these fines are separated from the briquets and fragments, as they exhibit a pyrophoric behavior.