Dry Submicron Classification by a Small Blow Down Cyclone

Abstract

At present, dry powders are classified using mainly a vortex centrifuge or sieving equipment, in which the lowest 50% cut size is still greater than one micrometer. Impactor-type classifiers are capable of operating in the submicron range, but have low throughput and high energy consumption. Our new free vortex cyclones are capable of producing excellent sharp classification of dry powders in submicron cut sizes, especially with the use of a 5% to 15% blow-down flow rate from the dust collector chamber. A specified cyclone has been experimentally studied under various operating conditions using several kinds of test powders. © 1993, Hosokawa Powder Technology Foundation. All rights reserved.