Patent ID: 7971815

Claim:
Grinding station with at least one coarse grinding circuit ( 1 ) and at least one fine grinding circuit ( 2 ), wherein the coarse grinding circuit comprises a classifier ( 10 ) and a material bed roller mill ( 11 ) and the precrushed material of the material bed roller mill enters the classifier, the coarse material ( 5 ) of which is redelivered to the material bed roller mill and the fine material of which is at least for the most part delivered to the fine grinding circuit, wherein the fine grinding circuit comprises a tube mill ( 20 ) with at least two grinding chambers ( 20 a , 20 b ) and a central outlet ( 20 c ) and a divider ( 21 ), wherein at least some of the grinding material of the coarse grinding circuit is divided in the divider and delivered to the two grinding chambers and the grinding material is discharged from the two grinding chambers together via the central outlet, and wherein the ratio of length to width of each grinding chamber ( 20 a , 20 b ) is ≦2.2.