Wet Overflow Type Rod Mill Machines

Rod mills are very similar to ball mills, except they use long rods for grinding media. 
The rods grind the ore by tumbling within the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6. Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (–4 to –35 mesh).  
Primary Mineral grinding rod mill machines

http://www.ms-machinery.com/product/primary-mineral-grinding-rod-mill-machines.html

Working principle:
For an equivalent grind, a rod mill uses less steel than a ball mill because of the lower speed and better contact between the media and ore. The rod charge must be maintained in good working condition, and broken and worn rods must be removed. Rod mills usually require greater operator attention. It is important that the rods stay essentially parallel to one another. If rods become misaligned, grinding action is lost and, more importantly, rod tangles occur. Maximum rod length is limited to about 6.1 m (20 ft). This in turn limits the length, diameter, and capacity of rod mills. 
The heavier rods acting upon the lifters and liners result in greater wear on the mill liners.

Specification and descrprition:
Rod mill is widely used in chemical industry, metallurgy, glasses industry which has rigid requirement of the evenness for milling after milling, sand making of building sand in recent years.

Technical parameters: