The DP® Spiral Jet Mill operates on the principle of particle-to-particle impact generated by high-velocity compressed air or inert gas streams. Material enters through the feed inlet (1) and is conveyed through the injector nozzle (2), where it is accelerated by the venturi system (3). Compressed air enters through the air inlet (4) and is directed into the nozzle ring (6), generating high-velocity spiral airflow within the grinding chamber.

Inside the grinding zone, particles are accelerated to extremely high velocities and collide repeatedly with one another along the top liner (5) and bottom liner (7). Since there are no moving grinding components, size reduction occurs entirely through inter-particle collision and attrition, resulting in contamination-free ultra-fine grinding with minimal heat generation.

This system is ideal for ultra-fine processing of heat-sensitive, abrasive, and high-purity materials in pharmaceutical, chemical, and mineral applications. The finely ground product, together with process air, passes through the collection liner (8) and exits through the air outlet (9) and fine product & air outlet (10) for downstream product collection and filtration

Features & Benefits

• Achieves ultra-fine grinding through high-velocity particle-to-particle impact using compressed air or inert gas.
• Capable of producing micronized powders with narrow particle size distribution for precision applications.
• No moving grinding parts inside the milling chamber, contamination-free ensuring processing minimal wear.
• Suitable for heat-sensitive, abrasive, and high-purity materials due to low temperature grinding operation.
• Screen-free grinding design eliminates blockage, reduces maintenance, and ensures uninterrupted operation.
• Available in laboratory and production models for R&D, pilot, and industrial scale processing requirements.
• Grinding chamber and internal components designed for easy access, quick cleaning, maintenance. and simplified