Separator for sorting of particular material

Claim 1

A separator for sorting particulate material suspended in a conveying gas into a fine fraction and a coarse fraction, which separator comprises a rotor with a shaft; a housing encasing the rotor and having an inlet for material/gas suspension entering the housing radially outside the rotor, an outlet for a fine fraction leading from radially within the rotor and an outlet for a coarse fraction leading from radially outside the rotor; whereby a major part of the material/gas suspension passes radially inwardly into the rotor while the remaining minor part of the suspension flows directly to the fine fraction outlet duct bypassing the rotor; said housing being separated from the top of the rotor by a distance that is variable depending upon the axial position of the rotor relative to the housing, and wherein an increase in said distance from the housing to the top of the rotor causes an increased amount of said remaining minor part of the suspension to bypass the rotor and flow directly to the fine fraction outlet duct, said separator further comprising a regulating means for adjusting the axial position of the shaft, and hence of the rotor relative to the housing in order to adjust the amount of unseparated material bypassing the rotor to the fine fraction outlet.