Krupp Polysius Ag

Osbert R Knobloch

Manfred Muller

Ludger Kimmeyer

Norbert Patzelt

Detlev Kupper

Heinrich Henne

Werner Brosowski

Lutz T Schneider

Ludger Brentrop

Peter Wenningkamp

Karl-Heinz Kuckuck

The invention relates to the comminution of material for grinding, particularly for the production of cement, wherein the material for grinding is comminuted in a mill and the comminution product is classified in a classification zone into fines and oversize material and the oversize material is returned to the mill. With a view to effective influencing of the breadth of the particle size distribution as well as a relatively low specific energy consumption the comminution product is classified in the classification zone in at least two air separators which are connected one behind the other in series, and a proportion of the oversize material from the first air separator is returned directly to the mill, the remaining proportion being delivered to the second air separator.

Method and apparatus for the comminution of material for grinding

The invention relates to a method and to apparatus for crushing brittle material for grinding, in which the material for grinding is first of all crushed in a roller mill under high pressure so that agglomerates are formed, then undergoes treatment to break up the agglomerates and afterwards is classified on a screen classifier, the oversize fraction is returned to the roller mill and the proportion of the product passing through the screen classifier is passed to a closed-circuit grinding arrangement. Such a method is distinguished by a uniform grinding operation in both crushing stages, requires low energy consumption for conveying the material for grinding from the first crushing stage to the second crushing stage and thus permits a greater spatial distance between the two crushing stages.

Apparatus for crushing brittle material for grinding

The invention relates to a method and to apparatus for crushing material for grinding, in which the material for grinding first of all passes in multiple circulation through a grinding stage which operates on the pressure crushing principle and then without further grinding is delivered to a classification stage consisting of two classification assemblies set to different degrees of fineness, the streams of fines from the two classification assemblies being mixed together. By the combination of these two measures a desired flattening of the particle size distribution of the end product is achieved.

Method and apparatus for crushing material for grinding

The invention relates to a method and to apparatus for crushing brittle material for grinding using a material bed roll mill, in which at least a proportion of the branch stream returned to the roll gap is dried to such an extent that a mixed moisture content which lies below a critical moisture content is produced in the roll gap. In this way it is possible even for material for grinding which has a high moisture content and above a critical moisture value has a tendency to sticking and/or caking on to be crushed satisfactorily.

Method and apparatus for crushing brittle material for grinding

The invention relates to a method and to apparatus for the crushing of material to be comminuted by means of a material bed roll mill, in which such material is forcibly delivered in a regulable mass flow to the roll gap. In this way even materials which tend to slip on the rolls can be crushed satisfactorily. It is also possible to keep the nature of the product constant over a wide range of variations in the throughput.

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Rheda-Wiedenbruck, Germany

Osbert R Knobloch