Closed-circuit grinding system for grinding cement clinker, ore and/or brittle grinding material, having - a first grinding circuit, in which a first high-pressure roller press comminutes and deagglomerates fresh material supplied, wherein a material diverter - returns a first part of the grinding material to the first high-pressure roller press and - leads a second part of the grinding material from the first high-pressure roller press to a second grinding circuit, - a second grinding circuit, the fresh material input of which is connected to the material diverter of the first grinding circuit, wherein - a static V-classifier forms the entrance of the second grinding circuit, - the coarse material outlet of the V-classifier being connected to a second high-pressure roller press, and - the fine material outlet of the V-classifier being connected to a rod basket classifier, wherein - the fine material outlet of the rod basket classifier forms the product outlet of the closed-circuit grinding system, and - the coarse material outlet of the rod basket classifier is joined to the coarse material outlet of the static V-classifier, and - the coarse material outlets (21, 31) of the static V-classifier and of the rod basket classifier are connected to the grinding material feed of the second high-pressure roller press via a conveyor, and - the grinding material outlet of the second high-pressure roller press is connected to the entrance of the static V-classifier. - a first grinding circuit, in which a first high-pressure roller press comminutes and deagglomerates fresh material supplied, wherein a material diverter - returns a first part of the grinding material to the first high-pressure roller press and - leads a second part of the grinding material from the first high-pressure roller press to a second grinding circuit, - returns a first part of the grinding material to the first high-pressure roller press and - leads a second part of the grinding material from the first high-pressure roller press to a second grinding circuit, - a second grinding circuit, the fresh material input of which is connected to the material diverter of the first grinding circuit, wherein - a static V-classifier forms the entrance of the second grinding circuit, - the coarse material outlet of the V-classifier being connected to a second high-pressure roller press, and - the fine material outlet of the V-classifier being connected to a rod basket classifier, wherein - the fine material outlet of the rod basket classifier forms the product outlet of the closed-circuit grinding system, and - the coarse material outlet of the rod basket classifier is joined to the coarse material outlet of the static V-classifier, and - the coarse material outlets (21, 31) of the static V-classifier and of the rod basket classifier are connected to the grinding material feed of the second high-pressure roller press via a conveyor, and - the grinding material outlet of the second high-pressure roller press is connected to the entrance of the static V-classifier. - a static V-classifier forms the entrance of the second grinding circuit, - the coarse material outlet of the V-classifier being connected to a second high-pressure roller press, and - the fine material outlet of the V-classifier being connected to a rod basket classifier, wherein - the fine material outlet of the rod basket classifier forms the product outlet of the closed-circuit grinding system, and - the coarse material outlet of the rod basket classifier is joined to the coarse material outlet of the static V-classifier, and - the coarse material outlets (21, 31) of the static V-classifier and of the rod basket classifier are connected to the grinding material feed of the second high-pressure roller press via a conveyor, and - the grinding material outlet of the second high-pressure roller press is connected to the entrance of the static V-classifier. - the coarse material outlet of the V-classifier being connected to a second high-pressure roller press, and - the fine material outlet of the V-classifier being connected to a rod basket classifier, wherein - the fine material outlet of the rod basket classifier forms the product outlet of the closed-circuit grinding system, and - the coarse material outlet of the rod basket classifier is joined to the coarse material outlet of the static V-classifier, and - the coarse material outlets (21, 31) of the static V-classifier and of the rod basket classifier are connected to the grinding material feed of the second high-pressure roller press via a conveyor, and - the grinding material outlet of the second high-pressure roller press is connected to the entrance of the static V-classifier.