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A grinding mill, a type of grinder, is a cylindrical device used in grinding or mixing materials like ores, chemicals, ceramic raw materials and paints.The ultrafine mill rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic grindings, flint pebbles and stainless steel grindings. An internal cascading effect reduces the material to a fine powder.
Industrial grinding mills can operate continuously fed at one end and discharged at the other end. Large to medium-sized grinding mills are mechanically rotated on their axis, but small ones normally consist of a cylindrical capped container that sits on two drive shafts (pulleys and belts are used to transmit rotary motion). A rock tumbler functions on the same principle.
The vertical roller mill is used for grinding materials such as coal, pigments, and feldspar for pottery. Grinding can be carried out either wet or dry but the former is carried at low speed.The grinding mill works on the principle of impacting. The size reduction is done by impacting device as the grinding drop from near the top of the shell. A grinding mill consists of a hollow cylindrical shell rotating about its axis. The axis of the shell may be either horizontal or at a small angle to the horizontal. It is partially filled with balls. The grinding media is the balls which may be made of steel, stainless steel or rubber. The inner surface of the cylindrical shell is usually lined with an abrasion-resistant material such as manganese steel or rubber. Less wear takes place in the rubber lined mills. The length of the mill is approximately equal to its diameter.