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.

Abstract: An energy-saving effective sifter used in interparticle crushing of brittle charging stock such as cement clinker in the nip of a high pressure roller press including a dynamic sifter having a rotating rod basket and laterally preceding the rotary rod basket sifter by a fluidized bed pre-sifting chamber having an admission opening at the top with a chamber defined between opposed porous walls to provide a pre-sifting zone with the walls formed by angularly adjustable baffles in one form, and passing air across the zone toward the rotary rod basket, removing a coarse grain fraction below the pre-sifting chamber, removing a medium grain fraction from beneath the rotary rod basket and removing fine material axially of the rotary rod basket passing the medium grain and coarse grain fraction into an interparticle crushing high pressure roller press having a nip pressure in excess of 2 t/cm of roller length, mixing the medium grain fraction and coarse grain fraction with a pre-comminuted pulverulent material such a

Abstract: A high pressure roller press for interparticle crushing of material including opposed crushing rollers with at least one roller being movable, a gate controlled material feed to the nip of the rollers, means measuring the nip width by measuring the distance between bearings of the rollers, means measuring the nip force by measuring the hydraulic pressure applied to the movable roller to obtain nip force, a comparator receiving signals of nip width and nip force and having an output to maintain a linear relationship between nip width and nip force and controlling the feed to the nip and the nip width to maintain the relationship.

Abstract: A grinding system for grinding brittle material such as used in the manufacture of cement including a high pressure roller press operated with high pressing forces to form interparticle crushing with incipient cracks in the interior of the particles including recirculating a portion of the material delivered from the press to a sifter locating the sifter directly above the nip and delivering the sifted material downwardly into the nip retaining the structural height of the system low and delivering fresh stock laterally directly into the nip of the roller press to merge with the sifted material entering directly into the nip of the roller press.

Abstract: A mechanism and method for the comminuting and grinding of brittle grinding stock including a roll press with the material passed from the roll press to a deagglomeration drum which co-rotates with the tube mill. The material from the deagglomeration drum is passed to the tube mill and the material from the tube mill being passed to a separator. In one form the material from the separator is passed to a second separator and the coarser products from the second separator are led back to the tube mill with an airstream conducting the finer material from the tube mill to the first separator.