The Difference Between the Ball Mill and Rod Mill

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 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). Grinding action is by line contact between the rods extending the length of the mill. Rods tumble and spin in roughly parallel alignment simulating a series of roll crushers. This results in preferential grinding of coarse material and minimizes production of slimes.
Rod Mill Sand-type widely used, its performance has reached international advanced level, is the most effective, practical and reliable machine crushed stone, sand and gravel industry is a widely used construction equipment, sand gravel, one of the rod mill Sand type is mainly used for feldspar, quartz, minerals and other raw materials, processing, crushing, also applies to the production of abrasives, refractories, cement, steel grit, slag powder, copper ore, iron ore, gold ore, concrete aggregate , asphalt aggregate and other hard, brittle materials in the crushing and broken, is an efficient, energy-saving equipment, sand gravel, sand making energy-efficient than traditional, is the world's advanced system sand equipment.
Of the three main types of rod mill, overflow, end peripheral discharge, and center peripheral discharge only the overflow mill is in common usage. Wet grinding rod mills are normally used in the mineral processing industry. Dry grinding is used in some areas; however, it is confronted with problems and should be avoided except where absolutely necessary. Rod mills operate at lower speed than ball mills since the rods are rolled and not cascaded. For an equivalent grind, a rod mill uses less steel than a ball mill because of the lower speed and better