working of ball mill and sag mill

Oct 12 2017· SAG mill make use of steel balls included with some large and hard rocks for grinding These mills utilize the balls in making the large fragments of materials broken into pieces The ball charge of a SAG mill is about 9 to 20 This process takes place inside the large rotating drum of SAG mill which is filled with balls partially

Lets calculate select pick a new ball for your SAG mill Now lets suppose you have a SAG Mill and Ball Mill that are not drawing full kW Power The SAG Mill has a small circulation load of oversize given be the 3 8″ trommel screen and the 1 2″ x 1 1 4″ discharge grates The load of 4″ balls in this SAG is good but un-measured

Sagmilling com is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools including for SAG mill-ball mill circuits and geometallurgy energy models are available to subscribers

The ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1 1 5 times the shell diameter Figure 8 11 The feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20 40 water by weight

offers AG mills SAG mills ball and pebble mills and stirred mills to your needs By continuing to use the site you agree to the use of cookies You can find out more by reading our cookie policy By continuing to use the site you agree to the use of cookies You can find out more by …

The operating principle of the ball mill consists of following steps In a continuously operating ball mill feed material fed through the central hole one of the caps into the drum and moves therealong being exposed by grinding media The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls

AG SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work of a ball mill Because of the range of mill sizes available AG SAG milling can often be accomplished with fewer lines than in a conventional rod mill ball mill circuit A diagram of types of AG SAG

Jun 20 2015· The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding The Motion of the Ball Charge

Oct 10 2016· The drum of the ball mill Pic 1 is a hollow cylinder of steel lined inside with armor lining plates which protect it from impact and friction effects of the balls and the grinding material The shape of drum liners has a significant impact on mill s work Drum Liners of ball mills operated on a large source material have ribs

Ball Mill Working principle When the ball mill works motor and speed reducer transmit torque force to big and small gears of ball mill so the barrel rotates When the barrel rotates Steel balls or other grinding media in the barrel are lifted t

Ball Mill Working principle When the ball mill works motor and speed reducer transmit torque force to big and small gears of ball mill so the barrel rotates When the barrel rotates Steel balls or other grinding media in the barrel are lifted t

stage ball mills rod mills or AG SAG mills when calculating power according to the Bond Third Theory method Rod mill and AG SAG mill products are similar and tend to be not as steep as a 0 5 slope when plotted on log-log paper This is because the particle size distribution PSD these mills

SAG milling extends itself to many applications due to the range of mill sizes available They can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work done by a ball mill SAG mills are also an optimum solution for wet grinding since crushing and screening in these

SAG mill coming out of a classical overload These examples highlight a fundamental difference between ball mill and SAG mill control While monitoring power draw alone is sufficient for ball mills in SAG mills both bearing pressure and power draw need to …

stage ball mills rod mills or AG SAG mills when calculating power according to the Bond Third Theory method Rod mill and AG SAG mill products are similar and tend to be not as steep as a 0 5 slope when plotted on log-log paper This is because the particle size distribution PSD these mills

Ball Mill Operation Ball mills ride on steel tires or supported on both ends by trunnions Girth gears bolted to the shell drive the mill through a pinion shaft from a prime mover drive The prime movers are usually synchronized motors During rotation a portion of the charge is lifted along the inside perimeter

SAG mills with a rated power of up to 35 MW As well as ever larger SAG mills ball mills are also expanding in size In the late 1990s the trend moved towards using GMDs to power these larger ball mills as well as using the drive to vary the speed GMDs quickly moved from 20 ball mills expanding to 24 25 and then 26 mills In early

Difference Between SAG Mill and Ball Mill from the working principle application structure etc Grind and blend solid or hard materials into smaller pieces by means of shear impact and compression

Nov 26 2019· Difference Between SAG Mill and Ball Mill from the working principle application structure etc Grind and blend solid or hard materials into smaller pieces by means of …

OPTIMIZATION OF THE SAG MILL CIRCUIT AT KINROSS PARACATU BRAZIL Conference Paper Ball Mill Work Index BWi Table 1 summ arizes the PLT DWT and BW i results for this sample

Oct 22 2012· Before the Esperanza order FL s largest SAG mill measured 38 and its ball mills 26 To the average person the difference between a 38 and a 40 SAG … Autogenous mills semi-autogenous mills and ball mills for wet … SAG and ball mill for gold ore grinding One of three SAG mills with 9 75 m diameter and 2 x 4000 kW drive power

II-314 RoM Ball mills a comparison with AG SAG Milling Aubrey N Mainza1 and Malcolm S Powell 1 1Mineral Processing Research Unit University of Cape Town Rondebosch 7700 South Africa

Ball mill preventive maintenance PM It is a frequency work to maintain and repair ball mills AG mills and SAG mills The maintenance work influences the rotational speed and service life of ball mills In order to reduce downtime of ball mill regular examination and …

work indices for the AG SAG mill and ball mill can be re-organised as 7 and 8 where B Wio and A Wio are the corrected operating work indices and WAG SAG WBM are the respective power draw of AG SAG and ball mills Note that the ball mill operating work index is applied only on the portion that needs the additional grinding Q2

The results obtained from this work show the ball filling percentage variation is between 1 2 3 7 which is lower than mill ball filling percentage according to the designed conditions 15 In addition acquired load samplings result for mill ball filling was 1 3 Keywords Miduk Copper oncentrator SAG Mill Ball Filling Percentage

Apr 01 2013· Home Processing Plant how does a sag mill work how does a sag mill work sag aftra sag aftra how does a sag mill work how a sag mill works Crusher South Africa Comparison of Ore Hardness Measurements for Grinding Mill … size F80 of 152 mm to 80 passing 1 7 mm and a simple adjustment procedure in case the SAG product size …

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semi-autogenous SAG mill and two ball mills each with 13 megawatts MW of installed power was expected to be SAG mill limited when treating competent basement rock Ausenco Services Pty Ltd Ausenco was engaged to help optimise and enhance the productivity of the Phu Kham comminution circuit over an eight-month period

mill As such primary ball mills should be designed with the rod mill work index and single-stage ball mills should be with both the rod mill and ball mill indices This is because it is common to observe a difference sometimes significant between the rod mill and ball mill index values for a given ore type McKen Verret Williams 2006 On

COMPARING SAG MILLS AND HPGR ON A CONSISTENT BASIS … ball mill work index tests were attempted on SPT product due to insufficient sample size Flowsheets how does a water flotation mill work for gold Grinding …