Jet Mills

Jet mills, microniser mills or fluid energy mills as they are also known, are used for very fine grinding or for materials that must not be contaminated. They are commonly used in the chemical, pharmaceutical and mineral industries. They consists of a grinding chamber in which contains three or more compressed gas jet nozzles at the lower end with an air classifier at the top of the grinding chamber. Material is fed into the chamber and the jets accelerate the particles to produce collisions where energy is released causing particle breakdown. The air classifier at the top of the chamber allows particles through once they have achieved the required fineness and any over sized particles are returned to the milling section where they are further reduced by high velocity collision.

There are different types available including fluidised bed opposed and spiral. Manufacturers of industrial jet mills include Alpine, Hosokawa Micron, British Rema, Netzsch and many more.