Grinding medium is an energy carrier in the mill that crushes materials by its own impact and grinding force.
The most commonly used grinding media are spherical media and rod media. In some cases, irregular shapes such as round tables, cylindrical balls, short round bars, etc. are used, which are called special-shaped media. The materials for making grinding media are mostly specially processed cast iron or alloys, followed by ceramics, alumina, etc.; the grinding media for gravel grinding includes nearly spherical, ellipsoidal, egg-shaped, etc., which are specially made from ore or rock .
The metal grinding media should be wear-resistant and corrosion-resistant, have sufficient strength and hardness, not be easy to break during work, and can roughly retain its original shape after wear. For the metal ball media consumption (the amount of media consumed by crushing 1t material, kg/t) and the ball breaking rate (the fraction of balls of different sizes in the test ball under the action of external force, %) is a measure of its quality The main indicators. For rod media, it is required not to bend and break easily. In grinding production, the most critical factor to improve the efficiency of the mill is to maximize the function of the grinding media.