Opposed Jet Mill
Opposed jet mills are appropriate for the superfine size reduction of a wide range of both soft and hard materials providing product sizes typically in the range of 1 to 80 microns. Combining the principles of Opposed Jet Fluid Energy Milling with the well proven high performance British Rema Aerosplit Classifier within a single unit, enables accurate and controllable product sizes to be achieved with sharp cut off and a typically narrow size distribution. The small AJ100 jet mill system can be supplied with interchangeable components enabling it to be converted into a Minisplit Air Classifier system for the particle size classification of a wide variety of materials.
Features and benefits
• Product range from 3 to 150 microns.
• Range of sizes to handle from 1 Kg/Hr or less up to 2000 Kgs/Hr.
• Integral forced vortex classifier provides accurate control of product size with sharp cut-off.
• On-stream adjustment of product size by variable speed classifier rotor.
• Generation of superfines controlled by adjustment of jet velocity.
• Feed entry configuration allows pre-classification of product sized material prior to milling.
• Suitable for handling abrasive materials with minimum contamination.
• Ability to accept some feed stocks up to approx. 3 mm reduces need for pre-grinding.
• Low operating temperatures enable heat sensitive material to be processed.
• Manufactured in mild steel or stainless steel with various lining material options.
• Low operation noise levels.
• Easy access for clean-out and maintenance.
• Negative pressure within the milling chamber provides dust free operation.
• Complete with automatic control system.
Operating Principals
• Feed material is introduced into the primary air stream by a variable rate feeder.
• Entrained feed material enters through primary air duct.
• Particles are introduced into a forced vortex generated within the machine by rotor.
• Particles are classified within the vortex as a result of the interaction between centripetal and air drag forces.
• Cut point is determined by control of rotor speed and air flow.
• Particles below cut sizes pass through the rotor and exit through duct with the entraining air for collection in the cyclone and bag filter.
• Coarse particles above the cut point migrate to the casing wall and descend through the discharge cone to the outlet.
• Secondary rinsing air enters through a separate duct in the classifier casing dispersing agglomerated fines giving improved product yield.
• Secondary air flow rate controls the residence time of particles within the separating zone and can be adjusted to give optimum classification conditions for widely differing materials.
• Fines and coarse fractions are collected in their respective containers.
• An integral induced draft fan provides conveying/classifying air for the entire system.
