Particle Size Reduction – Rotary Air Classifier Mills, Type CLM
Features
• Integral forced vortex classifier provides accurate control of product size with sharp cut-off
• Accurate and consistent product grading
• On-stream adjustment of the product size by variable speed classifier rotor
• Controlled generation of superfines
• Feed via a secondary air inlet gives the ability to pre-classify prior to grinding and minimises over grinding and the production of superfines
Operating Principals
• Feed material entering through the inlet duct is introduced to the first stage grinding area
• Semi-ground product from the first grinding stage passes through circumferential screens in the stator assembly and is conveyed to classifier rotor
• Particles are classified by the interaction between centripetal and air drag forces within the forced vortex created by the classifier rotor
• Product size is determined by control of the classifier rotor speed
• Particles below cut size pass through the classifier rotor and exit with the entraining air through duct
• Coarse particles above the cut point are rejected by the rotor and directed to the second stage grinding area for further reduction in cross flow configuration and re-cycled through the first stage grinding chamber
• A secondary air inlet in the casing allows control of the classifier air flow
• A specially designed exit port (not shown) in the secondary grinding stage enables excess unground impurities i.e. Silica to be rejected from the unit during operation
