Rod & Ball Mills

The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level. They are the most effective laboratory mills for batch-wise, rapid grinding of medium-hard to very hard samples down to finest particle sizes.

MACSALAB Rod / Ball Mill Vessels are available in Grade 304 and 316 Stainless Steel, Rubber - lined Mild Steel as well as Ceramic (Alumina).

Rods are available in Stainless Steel and Arlicite.

Grinding Spheres (balls) are available in Steel, Zirconia and Alumina. Quantity and sizes to client’s specifications.

MACSALAB Drive Rolls for Rod / Ball Mills are Rubber coated and manufactured in Double and Triple Roll models. The Rolls are 120 mm diameter x 1200 mm long and powered by a 0.37 KW 220 Volt Motor with a variable speed controller.

Ball/Rod mill Literature

The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level. They are the most effective laboratory mills for batch-wise, rapid grinding of medium-hard to very hard samples down to finest particle sizes.

A horizontal rotating cylinder (vessel) is partially filled with balls/rods (grinding media), usually stone or metal, which grinds material to the necessary fineness by friction and impact with the tumbling balls/rods. A rotating drum throws material and balls/rods in a counteracting motion which causes impact breakage of larger particles and compressive grinding of finer particles. Attrition in the charge causes grinding of finer particles.

These units are primarily used in the gold, copper and platinum industries with applications also in the lead, zinc, silver, alumina and nickel industries

Factors affecting grinding efficiency:

• Amount of material
• Amount of grinding media
• Speed of the Mill

Some guidelines for Steel and rubber lined vessels are given in the table below.