US 5,505,389 AGranted

Closed circuit grinding system

AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft

InventorsAlbert Sussegger, Siegfried Strasser

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Abstract

A recirculating grinding plant with a crushing high-pressure roller press and sifter which has low energy consumption and which operates without a separate drive disagglomerator for disagglomerating the roll press scabs. The raw material together with the scabs of the roller press are delivered directly to the delivery chute (15) of the disagglomerator/sifter, which is a static cascade sifter (16) enclosed by a column-like sifter housing and having two sift-zone barriers. The barriers form a sifting zone therebetween and sifter air flows through them in a cross-current fashion. The barriers include cascade-like or shutter-like deflectors (16a, 16b) pointing towards the bottom in direction of the discharge opening (19) for the sifted coarse material fragments (20). The two deflectors (16a, 16b) and the sifting zone (17) located therebetween are arranged oblique to the vertical.

Claims7

Dependent claims

A recirculating grinding plant for the grinding of raw material comprising:

a high-pressure roller press (21) for crushing said raw material into various size fragments;
a vertically extending static cascade sifter (16) having a feed opening (15) at its top, a fine and medium material fragments discharge (23) at its top, and a discharge at its bottom delivering coarse material fragments to said roller press;
means operable to convey said raw material and said various size fragments to said feed opening (15) of said cascade sifter (16);
a source of sifter air connected to said cascade sifter;
said cascade sifter (16) being enclosed by a sifter housing and having two sift-zone barriers forming a sifting zone (17) therebetween, said sifter air flowing through said barriers in a cross-current fashion, said barriers including deflectors (16a, 16b) pointing towards said discharge opening (19) for the sifted coarse material fragments, said deflectors (16a, 16b) and said sifting zone located therebetween being disposed oblique to the vertical.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/328,646Filed 25 Oct 1994
Priority: DE 43 37 215.530 Oct 1993
Granted: 9 Apr 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B02C 23/12
With separator arranged in discharge path of crushing or disintegrating zone: with return of oversize material to crushing or disintegrating zone
B02C 21/005
Using a combination of a roller mill and a drum mill: the roller mill having cooperating rollers
B02C 23/22
After crushing or disintegrating: with recirculation of material to crushing or disintegrating zone
Y02P 40/10
Technologies relating to the processing of minerals: production of cement, e.g. improving or optimising the production methods; Cement grinding