Degussa Aktiengesellschaft

Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Alfons Kreher

Gunter Turk

Siegfried Wolff

Lothar Rothbuhr

Peter Nauroth

Gerhard Kuhner

Werner Nagel

Eberhard Kilian

Albert Peters

Bernd Brandt

Finely divided powdery materials such as, e.g., precipitated silica are granulated by means of two rolls, one of which has a filter surface and the other has a profiled covering, in which the shafts of these rolls are arranged vertically one above the other and the finely divided powdery material is introduced into the gap between the rolls by means of at least one feed screw.

Process and apparatus for granulating powdery materials

There are produced mixed granulates of carbon black-light filler using carbon black and an aqueous suspension of a light filler, e.g. precipitated in a pin containing screw granulator.

Process for the production of mixed granulate from carbon black and

Free flowing, finely divided precipitated silicic acid granules of reduced dust content and reduced abrasion are obtained by a process including the step of subjecting a silicic acid suspension to intensive shearing action. Rubber compositions containing the precipitated silica produced in this way are also disclosed.

Precipitated silicic acid granules

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Frankfurt-am-Main, Germany

Alfons Kreher