Bayer Aktiengesellschaft

Heinrich Helker

Hans-Dieter Block

Rainer Weber

Hans-Heinrich Moretto

Norbert Lonhoff

Rainer Bellinghausen

Bernhard Spreckelmeyer

Uwe Arndt

Michael Batz

Hans Rinkes

Hans-Georg Nieder-Vahrenholz

Matthias Weis

Paul Strehlow

The invention relates to a device for supplying gas to a rotary kiln, which has a gas supply pipe 5 divided into segments 17 which is connected to an external gas source via an enclosing bracket 7.

Device for supplying gas to rotary kilns

A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.

Method for manufacturing alkali chromates from chromium ore

A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.

A device for supplying gas to a rotary cylinder by means of a slip ring channel is described, a relative movement between rotating part and stationary part of the slip ring being permitted.

Device for supplying gas to a cylindrical rotary kiln

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Krefeld, Germany

Heinrich Helker