The Tube Mill is widely used for the fine grinding of various materials in many industrial plants, as well as in ore milling where it is necessary to reduce the particles to 150 or 200 mesh. Even finer grinds can be obtained when operation is in closed circuit with a suitable classifier. This unit is essentially a secondary mill, taking a feed of ¼” or finer, according to characteristics of the material to be ground and the capacity to be maintained.
Liners can be furnished of hard iron, manganese steel, or for the chemical industries, silex blocks can be used. Flint pebbles or small steel balls are generally used as grinding medium.
These mills are heavily constructed of steel plate with cast heads securely mounted on the shell. The entire mill is then swung in a lathe to insure perfect alignment of trunnions. Two manholes are provided on opposite sides, generally near the ends, to allow inspection and change of liners.
Drive may be through spur gear with friction clutch pulley on the pinion shaft, by V-belt, speed reducer, or direct-connected to the motor through a flexible coupling and herringbone gears. A scoop feeder is standard and is usually equipped with a special lip to suit conditions.
Tube Mill Capacity