Jet-Milling System Grinds to Submicron RangeJet-Milling System Grinds to Submicron Range

The S-Jet is a jet-milling system that has the advantages of dry-grinding with superheated steam. By using an air classifier integrated in the mill, fineness down to the submicron range is possible.

Benefits are gained by using superheated steam as a grinding medium instead of air. The jet energy, which is considerably higher compared to that of air (jet speeds of up to 1200 m/s can be achieved), increases the discrete energy input and the kinetic impact energy of the product particles and is increased fourfold.

This is the most decisive point for obtaining fineness in the submicron range (e.g. d50 0.2 µm). In addition to this, as steam has a considerably higher sound velocity than air, the possible peripheral flow speed within the classifier wheel also increases and with this, the acceleration forces which affect the product being classified. Together, these factors make it possible to classify particles in a submicron range by dry-grinding.

The steam jet mill of the S-Jet series is available as a compact plant for grinding on a laboratory or small scale. The space required for installation is only 3 sq m.

Netzsch Premier Technologies LLC, Exton, PA 610-561-6257 www.netzsch.com

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