Maximum rod length is about 6 to 7 meters, otherwise there is a risk of the rods bowing. The drum diameter is to 0.6 or 0.7 times the length of the mill. Rod mills are used for grinding hard minerals. This type of mill is normally used as the first stage of a milling process to provide a reduced size feedstock for a further milling process.
Ball mills. Tube mills. Rod mills. Ρebble mills. Ball mill. The term ball mill is usually applied to a mill in which the grinding media are bodies of spherical form and in which the length of the mill is of the same order as the diameter of the mill body; in rough figures the length is, say, one to three times the diameter ...
Ball mill and rod mill are suitable for different materials. 1. Selection by material39;s hardness. Ball mill has a strong adaptation of material, and it is suitable for grinding hard materials, such as slag, iron ore, copper ore, etc. Rod mill is suitable for grinding brittle material, such as rare metals. 2.
Types on the Basis of Cylinder. 1. Short Cylinder Ball Mill: The ball mill with the cylinder length less than 2 times of the cylinder diameter, i.e. the ball mill with L 2D is short cylinder ball mill, which is usually of single bin structure, mainly used for rough grinding or primary grinding operation, and can realize the wide use of 2 3 ball mills in series.
Because of this, the rod mill can effectively reduce 1 feed size to 10 mesh or finer in open circuit. The voids within a rod load are approximately half those in a ball mill grinding load. Rods in place weigh approximately 400 pounds per cu. ft. and balls in place approximately 300 pounds per cu. ft..