ballmill sized feed Feed ore with a top size of up to 200 mm (8 in) and water enter the feed end of a SAG mill through a feed chute; the ore is milled in the shell and milled product exits through grates and pulp lifters at the discharge end (Fig 1) The discharge is screened and the undersize, typically less than 12 mm (05 in), provides ball
In this presentation an historical perspective of the origins of Mine-to-Mill is described and is followed by a discussion of how AG/SAG feed size affects throughput and specific energy and the factors that in turn influence AG/SAG feed size, such as ore hardness, Run of Mine (RoM) size distribution and crusher operation (both primary and secondary)
Mine-to-Mill: Changing AG/SAG feed size through blasting Professional development and learning material for minerals processing engineers. In this last presentation different ways of changing Drill-and-Blast design and how Drill-and-Blast is implemented to effect changes in Rom distribution are explored
SAG Mill I-12 Effect of SAG Mill Feed Size Distribution and Ore Variability Mill liner design modifications, and Circuit Design Considerations That Influenced Throughput
The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14’——means it is a dry mill
liner chuge sag mill - ZCRUSHER. Effect Of Sag Mill Feed Size Distribution And Ore ... SAG Mill load during this liner cycle ranged from 800 to 1100 tonnes ... Further more the 52 row liner design ... Detail About
SAG 2001 Abstract. As part of its investigation into run-of-mine ore fragmentation, Highland Valley Copper discovered the role of primary crushing in the optimisation of mill feed size. Image analysis methods were used to quality the effect of feed size on mill throughput and showed the in-pit crushers to be an integral step in the preparation
's AG/SAG mills accomplish the same size reduction work as 2 or 3 stages of crushing and screening The feed size for these mills is limited to the maximum size that can be practically conveyed and introduced into the large mill feed chutes. Read More. MMPB-748C Trunnion Magnet System - Eriez
Fo - Optimum Feed Size for rod mills F o W r =16 000 ... size and power relationships For SAG mills the equation becomes Power=(5.6115+%balls*0.1438)*D24. 6* L Mill Critical speed Crit Crit D = 42.3 n - revs per min nC= s*Crit Cs is the fraction of the critical speed
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009)
The optimum feed size for the rod mill oversize feed factor (EF 4 RM) in the Barratt E SAG equation is calculated using the greater of the sample's rod mill or crushing work index. The EF 4 RM is calculated greater of the crushing work index or the rod mill work index. The ball mill oversize feed factor (EF 4 BM) is always calculated with the
respect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W, 2001). 2.2. EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curves
F = Feed size, 80% passing ( m) f(x j) = -(0.295+x j/1000000) In 2011, Morrell discussed the appropriateness of SAG mill transfer size in regards to grinding mill specific energy modelling. It was suggested that since AG/SAG mills are mostly operated in very near 274
TABLE 1 Comparison of RoM and SAG mill operating regimes Speed, % critical Charge Filling, % total mill volume Bali filling, % total mill volume Internallength Aspect ratio, diameter/length Recycle stream Application AG/SAG 70- 80% 20 - 30% 4-15% 3-5m 0.7 -2 Trommel oversize & J)ebble crusher Primary grind South African RoM 75 -90% 35 - 45% 15
Schematic of ideal SAG mill feed size distribution. Source publication +5. DIAGNOSIS OF PROCESS HEALTH, ITS TREATMENT AND IMPROVEMENT TO MAXIMISE PLANT THROUGHPUT AT GOLDFIELDS CERRO CORONA
Differentiation of AG/SAG Mill Feed Particle Size Variations in Batch Milling Process Using Acoustic Emissions K. B. Owusu1, W. Skinner2, and R. K. Asamoah3 1.PhD student, University of South Australia, Future Industries Institute, Mawson Lakes, Adelaide, SA 5095, Australia
Jan 01, 2015 In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing the power consumed (kW) by the fresh feed rate (t/h)
P80 is the SAG hydrocyclone overflow 80% passing size, m F80 is the milling circuit feed 80% passing size, m, fSAG is a calibration parameter for pebble crushing and/or fine feed (typically 1.0 for 80% passing six inch mill feed and when no pebble crusher is present). WiBM is the Bond ball mill work index, unitless
The software uses the particular power model (Bond/Barratt, Morrell Mi, etc.) to determine what is the transfer size where the ratio of E SAG to E ball matches the ratio of mill power (1:1.5 in this example). This is the 'maximum efficiency' transfer size where the mills will both operate at
mill work index 11.4 kWh/t and an average RQD of 44%. RQD values of 25% resulted in a SAG mill feed size (F80) between 55 and 60 mm and throughputs of 6200 t/h. RQD values of 55% resulted in SAG mill feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and
Feed size effects what size is important? historically, Mine-to-Mill has – focussed on blasting alone – generation of more fines • pass through SAG mill onto ball mill circuits • higher throughput (e.g. 10% to 30%) • coarser grind size (possibly) fine 25mm medium 25
SAG mill. 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
Figure 1 shows a range of M4A SAG feed size distributions compared with an M1 feed size distribution. It is clear that the M1 material fragments very finely in the blast
Jun 06, 2016 Four 1067 x 2400 mm vibrating feeders under the coarse ore stockpile feed the SAG mill via a 1067 mm feed belt equipped with a belt scale. Feed rate was initially controlled by the SAG mill power draw with bearing pressure as override
ball-mill sized feed. Feed ore with a top size of up to 200 mm (8 in.) and water enter the feed end of a SAG mill through a feed chute; the ore is milled in the shell and milled product exits through grates and pulp lifters at the discharge end (Fig. 1). The discharge is screened and the undersize, typically less than 12 mm (0.5 in.), provides ball
Nov 26, 2019 The feed size is usually between 20-30mm and the product size is 0-3mm. Feed Both the autogenous grinding mill and the ball mill feed parts are welded with groove and embedded inner wear-resistant lining plate. As the sag mill does not contain grinding medium, the abrasion and impact on the equipment are relatively small
Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW
P80 is the SAG hydrocyclone overflow 80% passing size, m F80 is the milling circuit feed 80% passing size, m, fSAG is a calibration parameter for pebble crushing and/or fine feed (typically 1.0 for 80% passing six inch mill feed and when no pebble crusher is present). WiBM is the Bond ball mill work index, unitless
The feedsize (F. 80. ) estimate also exhibits a high degree of sensitivity to changes in powerdraw: a 100 kW change in powerdraw will result in a 20 mm change in feedsize estimate. A change in the feedsize of 2 to 10 mm (10 - 50%) would be a more