Apparatus and methods for separating particulate material into relatively
fine and relatively coarse particles wherein such particulate material is introduced
to a separating zone through which a gas stream flows at such volume and velocity
as to entrain fine particles and convey them from the separating zone to grinding
or other facilities and wherein the fineness of entrained particles may be adjusted
by diverting a selected portion of the gas stream from the separating zone to a
bypass passageway followed by recombining the diverted portion of such gas stream
with the gas containing the entrained particles.
