Methods and apparatus for the heat treatment of fine-grained materials

US3940236A · kind A · utility

Assignee

• Polysius AG

Inventors

• Paul Weber · Berlin, DE
• Hans Mollenkopf
• Kurt Henning
• Otto Heinemann
• Heinz-Herbert Schmits · Rheda-Wiedenbrück, DE
• Wolfgang Rother
• Horst Ritzmann · Enniger, DE
• Jurgen Wurr · Ennigerloh, DE
• Karl Krutzner · Beckum, DE
• Werner Schossler · Ahlen, DE
• Wolf Goldmann · Beckum, DE
• Georg Schepers

Key dates

• Filing date: May 13, 1974
• Grant date: Feb 24, 1976
• Expiry date: May 13, 1994

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27B7/2033
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Fine-grained material such as raw ground cement adapted to be fired in a rotary tube furnace is introduced to a vertical perheater and falls through a heating zone located at a level below the level at which the material enters the preheater. A stream of air enters the preheater at a level below the heating zone and passes upwardly at sufficient velocity to entrain the material that has passed through the heating zone, thereby causing such material to pass again through the heating zone. From the preheater the material is delivered to the furnace for final firing.