Gas flow type crushing and classifying apparatus

Claim 1

A gas flow type crushing and classifying apparatus comprising a first circulation classifying chamber including a first coarse particle discharge duct connected to a peripheral portion thereof and a first fine particle discharge duct connected to the chamber about an axis of circulation, baffle means disposed in said first circulation classifying chamber to be peripherally impinged upon by materials under treatment which are jetted out on high velocity gas flows from at least one nozzle such that said materials rebounding from said baffle means have components of velocity in a circulating direction within said first circulation classifying chamber, a second circulation classifying chamber connected directly to the top of said first circulation classifying chamber to be substantially coaxial therewith and substantially concentric with said first fine particle discharge duct, said circulation chamber including a second fine particle discharge duct substantially coaxial with said first fine particle discharge duct, a vane wheel mounted in said second circulation classifying chamber, spaces between adjacent pairs of vanes being in communication with said second fine particle discharge duct, and a gas classifying chamber interposed between said first and second circulation classifying chambers for blowing upwardly fine particles of the materials descending from said second circulation classifying chamber, said gas classifying chamber including a second coarse particle discharge duct connected to a peripheral portion thereof.