Messer Griesheim Gmbh

Siemens Axiva Gmbh & Co. Kg

Helmut Gursky

Wolfgang Volker

Elke Schweers

Dieter Steidl

Ulrich Bauer

Hubert M&uuml;ller

Raimo Dr&ouml;gemeier

Klaus Bochmann

Olaf Mientkewitz

Hans-Joachim Risto

The invention relates to a process for the comminution of bulk materials comprising synthetic polymers which do not have an elastomeric behavior by mechanical, thermal or electromagnetic loading of the bulk materials, which comprises treating the bulk materials, before and/or during the loading, with oxidants which have a redox potential of greater than 1.5 V or subjecting them to corona, UV or plasma treatment without complete oxidation of the synthetic polymer taking place.

Process for increasing the effectiveness of the comminution of bulk materials by oxidation

Fluidized-bed counter-jet mills are gas-jet mills with which extremely fine milling results can be produced with very little wear and tear. An improvement in the milling results can be achieved by cooling the gas jets with a refrigerant, but the improvement that can be achieved is not substantial and the consumption of refrigerant is very high. In order to lower the consumption of refrigerant while considerably improving the fineness of the milled material, the coarse material which is separated by the grader of the mill is cooled by the refrigerant within the fluidized-bed counter-jet mill and fed back into the milling chamber. Liquid nitrogen is the preferred refrigerant with which the sump of the mill is cooled.

Process and device for cold milling

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Frankfurt-am-Main, Germany

Helmut Gursky