Tumbling drum mill

TUMBLING DRUM MILL (EN: tumbling mill, pebble mill, rod mill, ball-tube mill; DE: Trommelmuhle; FR: moulin à tambour, broyeur à tambour; ES: molino de tambor, giratorio; RU: барабанная мельница) is the machine for the grinding of the useful minerals and other materials, which is representing by itself the rotating cylinder (drum), which is loaded with the grinding bodies. The ends of the drum are closed with the lids (the loading and unloading ones). During the rotation, the grinding bodies under the influence of the centrifugal force, and also of the friction between themselves and the lining of the drum, rise themselves to the certain height, and fall, breaking and abrasing the material, which is located within the drum mill. The grinding bodies are: the steel balls (ball drum mills), rods (rod drum mills), short pipes, namely, ziel-pipes, and ore lumps during the autogenous grinding.

The types of the tumbling drum mills differ by the shape of the drum, methods for the unloading, medium for the grinding. The design of the drums is determined by the ratio of their diameters (D) and lengths (L); 2:1 for the mills for the primary autogenous grinding of the "Cascade" and "Aerofol" types.