Abstract: A classifying device may be used to classify a granular material flow. The classifying device may comprise a first inlet that allows a first material flow into the classifying device, a second inlet that allows a second material flow into the classifying device, a static classifier, and a dynamic classifier. The static classifier may be positioned such that the static classifier at least partially surrounds the dynamic classifier. The classifying device may comprise a distributing device that is designed in such a manner that it supplies the material flow of the first inlet to the static classifier and the material flow of the second inlet to the dynamic classifier.

Abstract: A classifier for classifying granular feedstock has a rotary cage rotating about a rotor axis and an air-guiding system arranged around the rotary cage, wherein a classifying zone is formed between the rotary cage and the air-guiding system. In the classifying zone one or more baffles are arranged such that the torque acting on the rotary cage is increased—for the same rotational speed—by at least 20% with respect to an embodiment without baffles and/or the separation between the air-guiding system and the rotary cage is chosen such that the torque acting on the rotary cage is increased—for the same rotational speed—by at least 20% with respect to an embodiment wherein the separation of the air-guiding system is without influence on the torque of the rotary cage.

Abstract: A classifying device may be used to classify a granular material flow. The classifying device may comprise a first inlet that allows a first material flow into the classifying device, a second inlet that allows a second material flow into the classifying device, a static classifier, and a dynamic classifier. The static classifier may be positioned such that the static classifier at least partially surrounds the dynamic classifier. The classifying device may comprise a distributing device that is designed in such a manner that it supplies the material flow of the first inlet to the static classifier and the material flow of the second inlet to the dynamic classifier.

Abstract: A grinding installation for comminuting material may include a grinding apparatus and a classifying device that is connected to the grinding apparatus and classifies the material. The classifying device may include a static classifier and a dynamic classifier. The static classifier may be disposed so as to at least partially surround the dynamic classifier. The classifying device may comprise a coarse material outlet for discharging coarse material that comprises a coarse grain fraction, a grit outlet for discharging grit that comprises a medium grain fraction, and a finished material outlet for discharging finished material that comprises a fine grain fraction. The grinding installation may further include an open-loop/closed-loop control device for open-loop/closed-loop control of at least a part of a stream of material to the grinding apparatus. The present disclosure also concerns methods for comminuting material.

Abstract: Disclosed is a grinding mill including a roller press configured to comminute grinding stock, a first conveying mechanism in communication with the roller press and configured to transport downstream at least one of fresh grinding stock or grinding stock comminuted by the roller press, and a static sifter disposed downstream of the first conveying mechanism and configured to sift at least one of the fresh grinding stock or grinding stock comminuted by said roller press. The static sifter includes a sifting stock inlet disposed in an upper sifting space, and sifting gas inlet disposed in a lower sifting space, and an aeration plate separating the upper sifting space from the lower sifting space. The aeration plate also permits sifting gas to pass there through from the lower to the upper sifting space. The static sifter also includes oversized material outlets disposed in each of the respective upper and lower sifting spaces.

Abstract: The separation according to the invention of a material-laden hot gas stream substantially consists of the following method steps: the material-laden hot gas stream is separated in a first separator into a gas stream and a material stream, wherein the material stream contains a coarser and a finer fraction, and the material stream is then classified in a classifier with at least a proportion of the gas stream, the coarser fraction of the material stream being discharged, while the finer fraction is carried away together with the gas stream separately from the coarser fraction.

Abstract: Disclosed herein, a classifier for classifying granular feedstock has a rotary cage rotating about a rotor axis and an air-guiding system arranged around the rotary cage, wherein a classifying zone is formed between the rotary cage and the air-guiding system. In the classifying zone one or more baffles are arranged such that the torque acting on the rotary cage is increased—for the same rotational speed—by at least 20% with respect to an embodiment without baffles and/or the separation between the air-guiding system and the rotary cage is chosen such that the torque acting on the rotary cage is increased—for the same rotational speed—by at least 20% with respect to an embodiment wherein the separation of the air-guiding system is without influence on the torque of the rotary cage.

Abstract: Disclosed is a grinding mill including a roller press configured to comminute grinding stock, a first conveying mechanism in communication with the roller press and configured to transport downstream at least one of fresh grinding stock or grinding stock comminuted by the roller press, and a static sifter disposed downstream of the first conveying mechanism and configured to sift at least one of the fresh grinding stock or grinding stock comminuted by said roller press. The static sifter includes a sifting stock inlet disposed in an upper sifting space, and sifting gas inlet disposed in a lower sifting space, and an aeration plate separating the upper sifting space from the lower sifting space. The aeration plate also permits sifting gas to pass there through from the lower to the upper sifting space. The static sifter also includes oversized material outlets disposed in each of the respective upper and lower sifting spaces.

Abstract: The separation according to the invention of a material-laden hot gas stream substantially consists of the following method steps: the material-laden hot gas stream is separated in a first separator into a gas stream and a material stream, wherein the material stream contains a coarser and a finer fraction, and the material stream is then classified in a classifier with at least a proportion of the gas stream, the coarser fraction of the material stream being discharged, while the finer fraction is carried away together with the gas stream separately from the coarser fraction.

Abstract: The invention relates to an apparatus for classifying charge material, comprising a static classifier which has a ventilating base oriented obliquely to the vertical and traversed by classifying gas; an inlet opening for charging the charge material to the ventilating base; an outlet opening for the coarse material; a downstream dynamic classifier which comprises at least one rotor; and at least one outlet opening for the classifying gas laden with fine material. The ventilating base has a ratio of width to vertical height of at least 0.45, preferably of at least 0.6.