Pulverizer

Claim 1

A pulveriser comprising a chamber, bottom, upper and side walls forming said chamber, an inlet for material to be pulverised and an upper outlet for the pulverised material, a sleeve, an axis of said sleeve, said sleeve being mounted with its axis substantially vertical in said chamber, said sleeve including a peripheral wall having upper and lower ends, the peripheral wall of said sleeve being displaced from the side walls of the chamber to define a space therebetween and the upper and lower ends of the sleeve being spaced from the upper and bottom walls of the chamber, a plurality of openings in said sleeve adjacent the lower end thereof, a plurality of fluid nozzles located outwardly of the openings for projecting fluid jets at high velocity inwardly directly through said openings into the interior of the sleeve adjacent the lower end thereof along lines extending between a radius and a tangent to the sleeve, to cause particles of the material to be pulverised to impinge on one another, to effect the pulverising action, and a flange sealingly joining a lower part of the sleeve below said openings to the peripheral wall of the chamber, whereby the heavier particles leaving said sleeve move outwardly over the top end of the sleeve, drop downwardly in the space between the chamber side walls and the sleeve and are reentrained by the fluid jets for further pulverising action in the sleeve.