Apparatus and method for calcining or sintering fine-grained material

US4118177A · kind A · utility

Assignee

• Polysius AG

Inventors

• Paul Weber · Berlin, DE
• Erich Lankes · Ennigerloh, DE
• Gerhard Butschko · Hamm, DE
• Horst Ritzmann · Enniger, DE
• Peter Bohm · Friedrichsdorf, DE

Key dates

• Filing date: Nov 8, 1976
• Grant date: Oct 3, 1978
• Expiry date: Nov 8, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Fine-grained material is heat treated by being preheated and then is heated to its calcining or sintering temperature, following which it is again heated to such temperature and subsequently cooled. The concentration and residence time of the material during its second heating are greater than they are during its first heating, and the concentration of oxygen is greater during the first heating of the material than during its second heating.