Bayer Aktiengesellschaft

Bernd-Michael Holle

Horst Bornefeld

Hans-Gunter Zander

Jurgen Kischkewitz

Eckhard Bayer

Jorg Krekel

Gerhard Wiederhoft

Rolf Michael Braun

Hilmar Rieck

Peter Beumer

The present invention relates to a process for the production of titanium dioxide pigments and the use thereof.

Process for the thermal treatment of titanium dioxide in a circulating

A process for calcining a filter cake in a directly heated rotary kiln wherein part of the filter cake is separated from the entire mass of filter cake, the separated portion is predried and recombined with the remainder portion and the combined predried and remainder portion is calcined. The filter cake can be inorganic solids such as oxides of titanium, chromium (III), zinc and iron.

Process for the calcination of filter cakes with high solids contents

A process for micronizing solid matters in a jet mill, wherein the solid matters are brought into the jet mill across an injector and wherein the micronization takes place, if necessary, in the presence of milling aids and/or dispersing agents, wherein the solid matters are forcibly supplied to the injector and an apparatus for carrying out the process, the apparatus comprising a dosing means, a forcible entry means, and injector and a jet mill.

Process for micronizing solid matter in jet mills

Process and device for micronizing solid matter in jet mills

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Krefeld, Germany

Bernd-Michael Holle