Polysius Ag

Krupp Polysius Ag

Paul Weber

Horst Ritzmann

Otto Heinemann

Heinz-Herbert Schmits

Wolfgang Rother

Wolf Goldmann

Jurgen Wurr

Werner Schossler

Hans Mollenkopf

Georg Schepers

Kurt Henning

Karl Krutzner, Jr

Gerhard Butschko

Erich Lankes

Peter Wolfgang Bohm

The invention relates to a method of producing white cement in which a reducing atmosphere is maintained over the entire length of a rotary kiln and precalcination takes place in a preheater supplied with heat exhaust gases from the kiln. Additional fuel is delivered to the preheater in such quantity that the CO contained in the kiln exhaust gases is burnt. As a result the essential reduction processes take place reliably in the rotary kiln without any problems occurring in the preheater as a result of a high CO content.

White cement production

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.

Apparatus and method for calcining or sintering fine-grained material

Fine-grained material such as raw ground cement adapted to be fired in a rotary tube furnace is introduced to a vertical preheater 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.

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

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.

Growing community of inventors

Oelde, Germany

Paul Weber