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Ticona Gmbh

Klaus Schonert

Reinhard Wagener

Hans-Michael Fricke

York Reichardt

Rolf Gerstenberg

Method for separating polymer-salt mixtures

Method of and apparatus for fine, very fine, and microfine comminution

Method of and an apparatus for the separation of paramagnetic particles

In jigging for purposes of gravity separation of material to be concentrated the material is sorted into a heavy fraction which is withdrawn through a screen (2) and a light fraction withdrawn above the screen (2), by periodically passing flows from the bottom to the top through the feed material. If the material is predominantly of finer character, there will be a ragging (3) on the screen (2) composed of particles which are larger and usually also specifically heavier than those of the feed material. In this manner, however, the separation of feed material will be unsatisfactory in the fine particle size range having upper particle size limits between 300 .mu.m and 1 mm, particularly so if the particle size ratio of the material is rather broad. To obtain high-grade concentrates, and high yields at the same time, also in the fine particle size range mentioned and in the finest particle size range below the same, therefore, it is provided that, below the feed bed (5) a filter layer (4) is introduced which consists of particles having a density approximately the same as that of the heavy fraction and a size which is within the limits of from 1.2 to 2.5 times the upper particles size limit of the feed material, the height of the filter layer corresponding to at least twice the mean particle size of the filter layer particles, that, for jigging, the feed bed (5) first is stratified such that the finer particles of the specifically lighter material mainly are moved into the upper part of the feed bed (5), and that, during jigging, the periodic inflowing is effected or adjusted in frequency such that the filter layer will adopt a porosity of between 60% and 70% by the upward stroke and the stroke amplitude will range between 50% and 200% of the filter layer height. A jig for carrying out the method is disclosed as well.

Jigging method and apparatus for gravity separation in the fine and

A method for the fine grinding of inelastic material, in particular polymers as polytetrafluoroethylene, polyethylene, polypropylene, polyamide, organic chemicals and plastic metals, and of materials which are transferred into a state of inelastic behavior before or during grinding by application of heat and/or application and conversion of mechanical energy into heat is disclosed wherein the material to be ground is first urged by compression loading into recesses which are formed in the working face of grinding tools applying the compression loading or pressed into cavities of a bulk of grinding bodies, e.g. balls, preferably after previously mixing the material to be ground with the grinding bodies, the recesses or cavities having a size in accordance with the fineness to be obtained. During or after this procedure residual material which still connects the so formed sub-particles is destroyed by movement of the sub-particles relative to each other. The sub-particles are removed from the recesses or cavities. Apparatuses for carrying out the method are described, among which is a two-roller press the working surface of at least one of its rollers is provided with the recesses the size(s) of which correspond(s) or is related to the size(s) of the sub-particles to be obtained. If a mixture of grinding bodies and material to be ground is to be compressed by a two-roller press the size of the recesses for the formation of compacts, is a multiple of the size of the grinding bodies and the material to be ground. A ram press or a screw or worm press can be used in connection with a mixture of grinding bodies and material to be ground.

Method of and an apparatus for finely dividing inelastic materials

In order to carry out a fine and very fine comminution of brittle material, a bed of bulk material to be comminuted is first stressed between two practically non-yielding hard surfaces with a compression of at least 500 kg/cm.sup.2 to result in energy sufficiently high not only to cause comminution, but to also cause a distinct agglomeration or briquetting of the particles, whereafter the resulting agglomerates or briquettes are disintegrated by further mechanical stressing in a separate device.

Method of fine and very fine comminution of materials having brittle

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Clausthal-Zellerfeld, Germany

Klaus Schonert