| English | English Operating stages in a ball mill under various working conditions. The slow-motion pictures give information on the type of external stress undergone by the material to be crushed; this is dependent on the movement of the grinding element. When the movement of the mill grinding balls increases, intensive friktion grinding takes place; in the areas of deflection crushing is achieved by impact stress and abrasion. The film also shows that the actual critical rotational speed of the mill depends on the nature of the material to be crushed. |
