Closed circuit grinding system

摘要

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.