Abstract: A vertical roll mill may include a grinding plate, a grinding roll, a nozzle ring that horizontally surrounds the grinding plate, an air feed apparatus disposed under the nozzle ring, a discharge element disposed below or in a region of the air feed apparatus, and a bypass apparatus disposed in the nozzle ring. The bypass apparatus may form a connection between the nozzle ring and the discharge element. Further, the bypass apparatus can discharge particles that are difficult to grind, for example, ductile particles such as iron particles, from the grinding process. In some examples, the bypass apparatus includes a gas-impermeable outer skin in the region of the air feed apparatus.

Abstract: A vertical roll mill may include a grinding plate, a grinding roll, a nozzle ring that horizontally surrounds the grinding plate, an air feed apparatus disposed under the nozzle ring, a discharge element disposed below or in a region of the air feed apparatus, and a bypass apparatus disposed in the nozzle ring. The bypass apparatus may form a connection between the nozzle ring and the discharge element. Further, the bypass apparatus can discharge particles that are difficult to grind, for example, ductile particles such as iron particles, from the grinding process. In some examples, the bypass apparatus includes a gas-impermeable outer skin in the region of the air feed apparatus.

Abstract: The roller mill for grinding of material to be ground prescribed by the invention has a grinding table and at least one grinding roller which works with the grinding table, whereby a water lance for applying water to the material to be ground is placed in the rotation direction of the grinding table in front of the grinding roller. The water lance is designed to rotate and means for rotating the water lance are provided in order to specifically influence the exposure time of the water to the material to be ground before the material to be ground is gathered by the grinding roller.

Abstract: The roller mill according to the invention consists substantially of two grinding rollers which are driven in opposite directions and form between them a grinding gap for comminuting material to be ground, and a delivery chute via which the material to be ground is fed to the grinding gap. Furthermore, there is provided in the delivery chute a pressure sensor for measuring the static gas pressure, which pressure sensor is connected to a control or regulating device, which changes the circumferential speed of the grinding rollers in dependence on the measured static gas pressure. In the method according to the invention for operating the above roller mill, the static gas pressure in the delivery chute is measured and used to control or regulate the circumferential speed of the grinding rollers.

Abstract: The roller mill for grinding of material to be ground prescribed by the invention has a grinding table and at least one grinding roller which works with the grinding table, whereby a water lance for applying water to the material to be ground is placed in the rotation direction of the grinding table in front of the grinding roller. The water lance is designed to rotate and means for rotating the water lance are provided in order to specifically influence the exposure time of the water to the material to be ground before the material to be ground is gathered by the grinding roller.

Abstract: The roller mill according to the invention consists substantially of two grinding rollers which are driven in opposite directions and form between them a grinding gap for comminuting material to be ground, and a delivery chute via which the material to be ground is fed to the grinding gap. Furthermore, there is provided in the delivery chute a pressure sensor for measuring the static gas pressure, which pressure sensor is connected to a control or regulating device, which changes the circumferential speed of the grinding rollers in dependence on the measured static gas pressure. In the method according to the invention for operating the above roller mill, the static gas pressure in the delivery chute is measured and used to control or regulate the circumferential speed of the grinding rollers.