Air jet milling

Alain Chamayou (1) , John A. Dodds (1)

1 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement

This chapter talks about air jet milling. The first versions, developed in the late 19th century, used a jet of compressed air to project solids against a target. Such devices have the severe disadvantage of target wear and subsequent contamination of the products but have lead to the development of other versions with opposed jets, tangential intersecting jets and more recently opposed jets in a fluidized bed. Air jet milling, or more correctly fluid energy milling, uses high velocity jets of gas to impart energy to particles for size reduction. Air jet mills have mainly been developed for producing fine particles of below 50 mm. Most models are available in many sizes from lab-size versions (as low as to 1 gram/h) up to industrial versions (up to 6 tonne/h), making for easy testing and scale-up. However, a disadvantage is that air jet mills require ancillary air compressors that can assure high flow rates at pressures up to about 10 bars. In addition, the chapter also discusses different types of air jet mills.

Domaines: Sciences de l'ingénieur [physics]

Alain Chamayou, John A. Dodds. Air jet milling. Extrait de : Particle breakage / sous la dir. de A. D. SALMAN, M. GHADIRI et M. J. HOUNSLOW, Elsevier, p.421-435, 2007, 978-0-444-53080-6. ⟨hal-01730579⟩