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RoM Ball mills – a comparison with AG/SAG Milling ... Table 3 A summary of RoM ball and SAG mill test conditions. Test AG T1 AG T2 RoM ball T3 ... Ball size, mm - - 80 80 Mill power, MW 5.15 4 ...
The SAG mill product is then crushed to passing 3.35 mm and is subjected to the Bond ball mill work index (S d-BWI) grindability test to provide the total pinion energy at the specified grind size for mill design purposes, herein reffered to as micro ore hardness. The full SAGDesign test produces the SAG grindability (W SDT) and the Ball Mill
SAG mill itself and not on the test work program. Stated another way, money invested in a large SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates.
The selection of SAG and ball milling sizes and confi gurations for new projects is complicated by ... SAG pinion energy in kWh/t to grind from F80 152 mm to T80 1.7 mm, Bond Ball Mill Work Index in kWh/t, and the ratio of SAG kWh/t to BWi. The development of SAGDesign testing results in previous papers (Starkey, J. and s, M., ...
EFFECT OF BALL SIZE DISTRIBUTION ON MILLING PARAMETERS ... 2.6.1 Ball size distribution in tumbling mills 37 2.6.2 Milling performance of a ball size distribution 40 2.7 Summary 41 ... 1700 microns coal using 30.6 mm balls 83 A.4 Results of size analysis for + 26500 ...
The 24' x 39.5' Ball Mill The Copper Mountain ball mills are 7315 mm [24 feet] in diameter and 12040 mm [39.5 feet] long. They are overflow discharge ball mills with inside diameters of 7315 mm [24 feet] and grinding lengths of 11887 mm [39 feet]. Each Ball mill is .
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.
size distributions in AG/SAG mills. The existing models and understanding of grate ... The results indicate that 1.18 mm is approximately the size below which particles experience no classification (i.e. if presented to the aperture they will pass through). ... FIGURE 5 MILL OPERATING AS A PRIMARY ROM BALL MILL (TOP) AND AG MILL (BOTTOM). THE ...
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 ...
SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY ... (ball mill, rod mill, and MacPherson autogenous) and pilot plant ... Size K 80 (mm) 0.001 0.01 0.1 1 10 100 1,000. Although HPGR is a more recent
As the feed size is reduced further, less of the 50.8 mm balls and more of the 25.4 mm balls are required for the maximum capacity, attaining of 25.4 mm balls for a feed size of 4.7 mm (Fig. 6d). The capacity difference between the best and the worst make-up ball mixtures was as high as 150%.
SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.
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.
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with a DEM simulation for balls (25 mm top size) in a laboratory ball mill (250 mm) is shown in the snapshot given in Figure 2. The post-processing of these simulations allows slurry profiles and flow to be established in the mill as well as calculation of changes in impact and shear forces and energy dissipation with slurry rheology.
TECHNICAL NOTES 8 GRINDING R. P. King. 8-2 &ROOLVLRQ 5ROOLQJ ZLWK QLSSLQJ ... Figure 8.5 Effect of mill filling on power draft for ball mills. The data is taken from Rexnord Process Machinery ... LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62.
with sag mills being increasingly less so as the ball charge is increased. This contrasts with ball mills whose grinding media are generally constant with respect to competence and size ...
The analysis of the influence of ball sizes in SAG grinding hasn't been developed in detail by considering the effect on process parameters inside the mill, grinding efficiency or internal classification. Historically a conventional grinding reference has been made on the empirical .
Equipment Specification Sheet: SAG Mill Specific Gravity 3.6 tonnes/m3 Ball Mill Work Index 11.1 metric @ P 80 88 µm Primary Grind P 80 43 µm Production Rate 181.2 tonnes/hour Rod Mill Work Index 8.6 metric Ball Mill Work Index 12.2 metric Feed to SAG Mill 80% passing 150 mm Product from SAG Mill 80% passing 1000 µm SAG Mill Pinion Power 1155 kW
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 circuit. All of the above contributes to
Most mills used in mining rely on impact to breakdown rock to a suitable size for downstream processing. The impact can be rock on rock such as in an Autogenous Grinding (AG) mill, rock and a small ball charge (~10%), used in Semi Autogenous Grind...
Commercial ball sizes 10 – 150 mm; Number, size and mass of each ball size depends on mill load and whether or not the media is being added as the initial charge. For the initial chargin of a mill, Coghill and DeVaney (1937) defined the ball size as a function of the top size of the feed, i.e.,
May 08, 2015· Before making a change in the SAG mill ball size it is important to test it first in simulation. Before making a change in the SAG mill ball size it is important to test it first in simulation.
around the secondary crusher, a reduction in SAG mill make-up media size to 105 mm (and increased ball charge), a reduction in SAG discharge screen size to 8 mm and smaller, 65 mm ball mill make-up media instead of the 80/65 mm blend. The smaller SAG mill media size was recommended due to the wide range of conditions the mill
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