Patent ID: 7780012

Claim:
A dynamic air classifier for separation of granular and powdery materials into fractions of different grain sizes comprising: a rotary cage ( 1 ) adapted to create a vortex when subjected to air flow, the rotary cage ( 1 ) classifying the materials into fine particles and coarse particles; a recovery chamber ( 2 ) having an outlet bottom, said recovery chamber ( 2 ) being defined by a casing ( 5 ), wherein the recovery chamber ( 2 ) receives the fine particles mixed with air from the rotary cage ( 1 ); said recovery chamber ( 2 ) coaxially arranged in a protrusion of the rotary cage ( 1 ), the recovery chamber ( 2 ) adapted to use the vortex created by the rotary cage for cycloning the fine particles mixed with air and separating the fine particles from air; and said recovery chamber ( 2 ) including a fine particles outlet and an air outlet, wherein the fine particles separated from air exit through the fine particles outlet and a dedusted air exits through the air outlet.