Making iron powder having fiber-like particles

US4213777A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Klaus Grebe
• Hans De Haas · Papenburg, DE

Key dates

• Filing date: Aug 8, 1978
• Grant date: Jul 22, 1980
• Expiry date: Aug 8, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S75/952
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Iron oxide powder, e.g., ore, is reduced in a CO/N.sub.2 atmosphere at a temperature between 750.degree. to 1200.degree. C., whereby prior to the onset of precipitation of metallic iron the content of H.sub.2 is limited to 15% (vol) of the CO content, and SO.sub.2, H.sub.2 S, COS or another suitable gaseous sulphur compound is developed or maintained in the reducing atmosphere at a range from 0.0005 to 0.1% (vol), preferably 0.001 to 0.01% (vol) in relation to the CO content.