... simple structure design 3. low noise 4. suitable for dry 1.WorkingPrinciple BPQ series mini pulverizer. When compressed ... classification chamber will separate those coarseparticles back to milling room for further milling, finally, ultrafine powderwill be discharged on ... expanded, the temperature drops,therefore, it is suitable for milling low melting-point, heat-sensitivematerials, and processes ...