Abstract: A static V-classifier or cascade classifier having a stairway cascade (13) and oppositely arranged classifying flues (15) with upward extending and adjustable guide vanes (21) at their upper ends for altering the cut point of the classifier by controlling the classifying gas velocity in the several classifying ducts lying between the classifying flues (15).

Abstract: A static V-classifier or cascade classifier having a stairway cascade (13) and oppositely arranged classifying flues (15) with upward extending and adjustable guide vanes (21) at their upper ends for altering the cut point of the classifier by controlling the classifying gas velocity in the several classifying ducts lying between the classifying flues (15).

Abstract: Two-stage classification of a granular material, in particular a cement grinding feed, is accomplished in two classifiers connected in series in such a way that the separative behavior or the separative action and thus the particle-size distribution of the undersized or finished material coming from the second classifier can be modified with simple resources. Part or all of the oversized material of the second classifier is recycled to the second classifier.

Abstract: A recirculating grinding plant with a crushing high-pressure roller press and sifter which has low energy consumption and which operates without a separate drive disagglomerator for disagglomerating the roll press scabs. The raw material together with the scabs of the roller press are delivered directly to the delivery chute (15) of the disagglomerator/sifter, which is a static cascade sifter (16) enclosed by a column-like sifter housing and having two sift-zone barriers. The barriers form a sifting zone therebetween and sifter air flows through them in a cross-current fashion. The barriers include cascade-like or shutter-like deflectors (16a, 16b) pointing towards the bottom in direction of the discharge opening (19) for the sifted coarse material fragments (20). The two deflectors (16a, 16b) and the sifting zone (17) located therebetween are arranged oblique to the vertical.