and the quality of such classification it has been ascertained that at any rate a throughput of bulk material in quantities of up to 50 tons per hour is attainable in this manner without a reduction of the separating quality an additional advantage lies in the fact that feeding of the bulk material from below simplifies the guidance and mounting of the supply conduit and in particular makes it unnecessary to arrange the feed conduit above in intake pipe in an exposed position on the roof of high silos where special anchoring means are required while in the present classifier the bulk material to be separated must be fed to the intake by a suitable conduit itself having a bend the bend can have a large radius of curvature secondly feeding the bulk material upwardly into vertically disposed uptake pipe make possible the use of low conveying velocities for the bulk material the deflection cone also enables the disolution of potentially existing local concentrations of material and although shown as concentric with the central vertical axis of the classifier the apex of the deflector cone may be arranged off center to provide additional evening or distribution of the bulk material the formation.