B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
B02C 23/08 (2006.01) B02C 15/00 (2006.01) B02C 23/16 (2006.01) B02C 23/32 (2006.01)
Patent
CA 2127389
ABSTRACT OF THE DISCLOSURE A method and an apparatus for crushing material of differing grain size are disclosed. The material is ground into particles in a grinding pan of a mill, then spun over the edge of the pan and conveyed upwards in a helical flow close to the casing wall of the mill by a gas-directing device producing a rotary flow. Centrifugal force and gravity result in the formation of an outer particle flow of oversize material. As a vented concentrated flow, the oversize material does not participate in the grinding and classifying process and at least a portion of the material is removed from the grinding and classifying chamber. A device for removing the oversize material is positioned on the casing wall above the grinding pan, and is connected to a mechanical conveying device. Some or all of the oversize material may thereby be returned to the grinding and classifying chamber.
Brundiek Horst
Lohle Willy
G. Ronald Bell & Associates
Loesche Gmbh
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