Classifier for comminution of pulverulent material by fluid energy

摘要

A fluid energy mill has an internal centrifugal classifier exhausting product-sized particulates entrained in fluid carrier medium such as steam. The classifier discharges oversized pulverulent material entrained in fluid carrier medium downward and outward into the sonic or supersonic discharge of fluid carrier medium from a plurality of centrally located nozzles. The nozzles create a grinding field directed outward and upward within a containment vessel at the top of which the mixed flow is directed radially inward by the containment walls. Turning vanes induce vorticity in the downward flow through the centrifugal classifier. A pipe disposed axially with the vessel exhausts the product stream and feeds raw pulverulent material into the mill.