Summary. The Rod Mill is the same as the Ball Mill in the construction and available to both of wet and dry processing. Unlike the Ball Mill, however, the Rod Mill uses rods instead of balls as the grinding medium.
Ball mills are commonly used in the manufacturing of cement and finer grinding stages of mineral processing. Typical type of fine grinder is the ball mill. 'Rod mill' is also used as a synonym for a slitting mill, which makes rods of iron or other metal.