ball mill vs rod mill

The ratio of cylinder length to diameter of rod mill is generally 1520 and the inner surface of liner plate on end cover is vertical plane In most cases the ratio of the length to the diameter of the ball mill is only slightly greater than 1

Nov 23 2019 · The rod of diameter from 50 to 100 mm is often used as the grinding medium and the filling rate of rod mill is 35 to 45 while filling rate of ball mill is 40 to 50。 Rod is mainly made of several materials

50100mm steel rod is usually used as grinding medium in rod mill while steel ball is used as grinding medium in ball mill The steel balls are in point contact with each other and the steel rod of rod mill is in line contact with each other so their working features are obviously different 4

In the ball mill commonly used have the lattice ball mill and overflow ball mill named from different drainage structure and the rod mill does not use the grid plate drainore only overflow type and opening type two kinds the diameter of the hollow shaft at the drainage and  end is generally larger than the same specification ball mill

Apr 02 2012 · 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

If finer grinding is wanted two or three stage grinding is advisable as for instant primary rod mill with 75100 mm 3″4″ rods secondary ball mill with 2540 mm1″1½” balls and possibly tertiary ball mill with 20 mm ¾” balls or cylpebs

In the rough grinding the product particle size of 13mm the processing capacity of the rod mill is greater than the same specificationof ball mill when used for fine grinding the product granularity is less than 05mm the grinding effect of the ball mill is greater than the same specification of the rod mill

The rod mill adopts overflow type and open type discharge does not use grate type discharge The diameter of the rod mill discharge end is larger than that of the same size ball mill When the rod mill speed is lower than the working speed of the same size ball

Grinding media analysis Rod mills commonly use steel rods with a diameter of 50100mm as the grinding medium while ball mills use steel balls as the grinding medium The difference in the grinding body is the main difference between the two There is a point contact between the steel balls of the ball mill

Rod mill is a type of grinding mill whose grinding media is steel bar while ball mill is steel ball Rod mill are usually applied to grinding the wsn ore and rare metal in the reselection or magneticoredressing plant in order to avoid the damage caused by the over crushing

The difference between ball mill and rod mill 1 Shape and structure The ratio of tube length to diameter of the rod mill is generally 1520 and the inner surface of the lining plate on the end cover is vertical plane The ratio of cylinder length to diameter of ball mill is small and in most cases the ratio is only slightly greater than 1

Ball Mills vs Rod Mills When the mill is rotated without feed or with very fine feed the rods are in parallel alignment and in contact with one another for their full length New feed entering at one end of the mill causes the rod charge to spread at that end This produces a series of wedge shaped slots tapering toward the discharge end

Ball mills and rod mills are both excellent mining machines for grinding ores into fine powders and particles However there are some advantages to using rod mills rather than ball mills for larger mining projects including greater efficiency better grinding performance and lower energy costs

Jun 11 2019 · In the order you have listed a ball mill can fine grind down to 400 mesh if needed a rod mill will efficiently grind to 150200 mesh range and a roll mill can do a 100 mesh The ball and rod mills are similar in appearence as a large rotating lined cylindrical tube filled with either metal balls or long rods used as the grinding medium

Rod mills have an industrial yield that is less than that of a ball mill which explains the fact that balls have a much larger grinding surface than rods The power needed to operate a rod mill could exceed 30 of the power used in a ball mill When they are worn rods must not stretch but break in rather small pieces so that they can exit

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 14 to 16

1 Short Cylinder Ball Mill The ball mill with the cylinder length L less than 2 times of the cylinder diameter ie 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

TECHNICAL NOTES 8 GRINDING R P King 82 ROOLVLRQ These mills exist in a variety of types rod ball pebble autogenous and semiautogenous The grinding action is induced by relative motion between the steel balls in a ball mill or large lumps of ore in an

Apr 09 2015 · Ball mills Ball mill Fig 1 is same kind of mill as rod mill except that it is filled with balls instead of rods Because of balls have greater ratio of surface area than rods they are more suitable for fine grinding Balls are also lighter so the kinetic energy of a single dropping ball is smaller than a rod

Every mining operation has a unique grinding process Metso has experience of over 8000 grinding mills globally including manufacturing and delivering the largest SAGAG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill