Abstract: The invention relates to a material dispersion apparatus, particularly for spreading classifiers, with an upper material supply and a material feed surface. The material feed surface is constructed as a sieve-like surface, which is installed in an air channel and the material supply is fluidized above the sieve-like surface and discharged over the outer rim of the material feed surface to fall down to the spreading classifier basket.

Abstract: The invention relates to a method for comminuting brittle grinding material. An overall economic optimization is required of methods performing only a single grain and material bed comminution in a first comminution stage. According to the invention the first comminution stage comprises precrushing the grinding material with a relatively well defined particle size, so that following stages can be designed for said particle size and consequently it is only necessary to have a lower specific energy requirement per grinding material quantity fed through.

Abstract: The invention relates to a tube mill partition as the discharge or transfer wall. With a view to an improved air passage and a simple material flow regulation, in the case of this partition a substantially tubular central part is used, in that a rotary and/or wholly or segmentally axially displaceable adjusting ring regulates the material flow.

Abstract: The invention relates to a tube mill partition as a transfer or discharge partition. With a view to reducing wear and facilitating maintenance, separate wearing beams are used and the latter or the slotted plates can be easily replaced without any further assembly opening.

Abstract: The invention relates to a process and to an air classifier for the separation of classifying material into coarse material and fine material. Known air classifiers suffer from considerable deficiencies with regards to the throughput and the separation efficiency. To avoid this, the invention provides for the performance of a separate reclassification, which takes place in the same way as the pre-classification, whilst incorporating mechanical centrifugal rejection of coarse material particles, particularly through the impact ledges of a centrifuge basket.

Abstract: The invention relates to a rotary basket air classifier. A favorable predispersion of the material to be classified, particularly in the case of an upwardly directed spent classifying air line has always been problemmatical with such classifiers. According to the invention, the material to be classified is distributed over several stages, aided by dispersing blades and a higher drawing-off capacity of the spent classifying air is permitted by the branching of the drawing-off line.

Abstract: A classifier using a swirling air current has two or more scatter plates turning about a common axis at different speeds and designed for causing outward motion of feed towards baffle rings placed round and turning with the scatter plates.