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[April 2009]
Quantum Leap in Dry Grinding Technology
NETZSCH-CONDUX Mahltechnik GmbH (Hanau, Germany) will present an innovative development in the field of dry grinding in the form of the new s-Jet® system at this year’s ACHEMA exhibition in Frankfurt.
This process, for which a patent has been registered and which has been described by specialists in the field of mechanical process technology as a quantum leap, represents the newest further development in jet milling. With it, final finenesses in the submicron range (e.g. d50 0.2 µm) can now be achieved.
Contrary to the conventional dry grinding method of jet milling, overheated steam is used as a grinding gas in fluidised bed jet mills with the s-Jet® system.
As steam has a considerably higher acoustic velocity than air, the possible peripheral speed of the flow within a classifier wheel increases and with it also the acceleration power, which affects the product being classified. In this way, in turn the decisive step has been made to actually enable the classification of particles in the submicron range by means of dry grinding for the first time.
In addition to this, the new s-Jet® system also has interesting commercial aspects: Steam provides a considerably higher flow energy compared to air. Jet velocities of up to 1200 m/s can be achieved and the kinetic impact of the product particles within the fluidised bed increases fourfold. This leads to a considerable increase of the mill throughput compared to the throughputs obtained during operation with air (more than double). Therefore, the throughput of the fluidised bed jet mill operated with steam increases considerably with comparable finenesses.
Just in time for this year’s ACHEMA exhibition a complete production scale s-Jet® system has been installed in NETZSCH-CONDUX’s test lab in Hanau. This worldwide unique test plant is now available to interested customers for testing of their products.
Furthermore, at the same time as ACHEMA 2009, interested users will have the possibility of experiencing this new plant live. During the ‘s-Jet® goes live!’ demonstrations, especially organised to coincide with the exhibition, this new technology and its advantages will be presented in detail.
The close proximity of the Hanau facility to the exhibition centre at Frankfurt (approximately 30 minutes by car) gives interested parties a unique possibility of participating without significant loss of time. Two events per day (morning or afternoon) permit the visitor to witness a live demonstration and also leaves him/her ample time to visit the exhibition on the same day. An organised shuttle service will bring visitors to ACHEMA from the exhibition centre to Hanau and back.
ENDS