Method of making iron powder

US3975186A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Klaus Grebe
• Hans De Haas · Papenburg, DE
• Norbert Dautzenberg · Wegberg, DE
• Josef Hewing

Key dates

• Filing date: Sep 10, 1975
• Grant date: Aug 17, 1976
• Expiry date: Sep 10, 1995

Classification

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

Abstract

Iron oxide particles are made by spray calcination and the oxide is reduced at least substantially in CO at temperatures between 800.degree. and 1000.degree. C. The oxide is heat-treated prior to calcination or CaO is added to enhance formation of iron fibers. The reducing atmosphere may in parts include hydrogen or the last phase of reduction is carried out in hydrogen. The iron cake is cooled and broken up in a grinder. The resulting powder has low bulk density due to a fiber-like, non-porous consistency of its particles. Grinding may continue to increase bulk density.