Patent ID: 6145765
Filing Date: 2000-11-14
Classification: B02C

Abstract:
In a fluid energy mill of a vortex type for comminuting pulverulent materials having in combination,a disc-shaped grinding chamber defined by a pair of opposing circular-shaped axial walls and a peripheral wall,a multiplicity of jets extending through the peripheral wall for injecting gaseous fluid into the chamber,an inlet for introducing pulverulent material into the chamber, andan outlet along the axis of the chamber for withdrawing the pulverulent material and gaseous fluid from the chamber, the improvement comprising:(a) a curved-shaped insert having an azimuthal angle between about 10.degree. and about 300.degree.; a leading edge and a trailing edge, wherein the leading edge is positioned upstream of, downstream of, or at the inlet for introducing the pulverulent material; and a positive or zero angle of attack to alter the pressure of the gaseous fluid in the region of the inlet; and(b) a means for mounting the insert in the grinding chamber, wherein the insert is operatively attached to the chamber.