sag mill feed size distribution

(PDF) Influence of feed size on AG / SAG mill performance

The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance.

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Ø Effect of SAG Mill Feed Size Distribution and Ore ...

SAG Mill I-12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifications, and Ø Circuit Design Considerations That Influenced Throughput

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SAG Mill Grinding Circuit Design - 911metallurgist

Jun 06, 2016  By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...

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Crushing SAG Mill Critical Size Material

Apr 18, 2018  Secondary mill feed – Continuous regulation capability gate to allow controlled distribution of feed between the two ball mills. Finally, if the amount of critical size material removed from the mill is less than the crusher and secondary mills capacities, those mills can also be fed with a small fraction of the SAG mill trommel undersize in ...

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SAG Mill Ball Sizing - Grinding Classification Circuits ...

With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 (up to 2.5) for a coarse mill feed (say F80 > 110 mm). If the mill feed size is fine, say 50 mm or 30 mm, then you are looking at a total charge to ball charge ratio of about 1.5-1.6.

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SAG Mill Feed Particle Size Analyser - 911metallurgist

Mar 30, 2018  We describe here one of the very first pioneering SAG Mill Feed Particle Size Analysers: A set of preliminary experiments was carried out in order to assess the hardware-software’s behaviour.Static ore was used to obtain the right sequence of image processing algorithms. The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill.

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Semi-autogenous grinding (SAG) mill liner design and ...

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

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A General Model for Semi-autogenous and Autogenous Milling

an 8 m diameter SAG mill with LID = 0.5 grinding a copper ore, and predicted maximum capacity and minimum kWh/ton at about 6070 ball load at 25070 ... complex function of the feed size distribution and specific rates of breakage. However, it is still convenient to define a mean residence time by solid hold-up W divided by solid feed rate, ...

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SAG Mill - goldcilplant

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.

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Modelling SAG milling power and specific energy ...

Jan 01, 2015  The feed size distribution is also the implicit result of the ore competence (affecting blasting and crushing performance). This distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or ...

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Influence of Feed Size on Ag Sag Mill Performance

Mill Weight Power Top Size Figure 4: Feed Top Size vs. SAG Mill Performance 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 13:00 14:00 15:00

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Mine-to-Mill: The influence of feed size on AG/SAG milling ...

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).

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feed size for sag mill - nationalcollegenuapada.org

SAG Mill I 12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifications and Ø Circuit Design Considerations That Influenced Throughput. Chat Online; Back to Basics Hammer Milling and Jet Milling .

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Blasting design for increased SAG mill productivity ...

Nov 01, 1993  SAG mill throughput is often a bottleneck to increasing plant productivity. Improved size distribution control in the mill feed can be used to increase mill production. This can be accomplished by controlling blast fragmentation as a function of energy input and rock characteristics. Such an approach requires the integration of rock fragmentation and comminution modeling. The optimal mill feed ...

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FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

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.

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INFERENTIAL MEASUREMENT OF SAG MILL PARAMETERS IV ...

The oversize crusher feed size distribution, oscf, and the primary cyclone feed size distribution, pcfd, are estimated utilising the SAG mill grate size and discharge screen aperture sizes and the Rosin-Rammler size distribution function, which has been selected for its convenience and since it “has been found to fit many

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AG - Autogenous SAG Semi-Autogenous Mill Design Calculations

Apr 17, 2018  A typical calculation is given in the following example: Product Size: All passing 6 mesh with 80% passing 20 mesh. Mill, gear and pinion friction multiplier: 1.025. Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp. 5440 Hp ÷ 0.98 = 5550 HP (required minimum motor output power).

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sag mill feed size - chirurgiaplasticainforma.it

sag mill feed size distribution. SAG Mill Grinding Circuit Design - Metallurgist , Critical-sized particles are those where the product of the mill feed-size distribution and the mill breakage rates result in a buildup of a size range of material in the mill load, the accumulation of which limits the ability of the mill

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What's the Difference Between SAG Mill and Ball Mill ...

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.

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SAG Mill Optimization using Model Predictive Control

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).

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Chapter - M MODELLING, SIMULATION, OPTIMIZATION

operation fluctuations. To sample SAG mill fresh feed, belt conveyor was stopped and a sample was taken by removing material over a two-meter length. Operating condition during sampling was recorded. Particle Size distribution of all samples except mill fresh feed and scats reject was determined using 6730 to 38 µm screens.

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20150806 Survey Sample Grinding Circuits-GMG-ICE-v01

F80 80% passing size of the circuit feed (μm) HPGR High Pressure Grinding Roll P80 80% passing size of the circuit product (μm) PSD Particle Size Distribution ROM Run-of-Mine SAG Semi-Autogenous Grinding SMC Test® SAG Mill Comminution Test 3. KEYWORDS Autogenous Grinding (AG) mill, Ball mill, Comminution,

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(PDF) Optimisation of the Sossego SAG mill Mauricio ...

A implemented at the Sossego SAG mill, briefly described as follows. SPLIT on-line size distribution analyzer was later installed at the SAG mill feed conveyor. All these actions resulted in a much more controlled First Generation size distribution of primary crusher discharge. Table 3 shows the results obtained during May 2006.

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Throughput optimisation in milling circuits

Rock Size Distribution. Rock Distribution of bulk material ie. mineral ore. ... SAG Mill Discharge. Controlling the feed and discharge of a mill is mostly a stabilisation exercise – you need to be able to quickly and accurately control the mill feed rate. If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at ...

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sag mill feed size - chirurgiaplasticainforma.it

sag mill feed size distribution. SAG Mill Grinding Circuit Design - Metallurgist , Critical-sized particles are those where the product of the mill feed-size distribution and the mill breakage rates result in a buildup of a size range of material in the mill load, the accumulation of which limits the ability of the mill

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feed size for sag mill - nationalcollegenuapada.org

SAG Mill I 12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifications and Ø Circuit Design Considerations That Influenced Throughput. Chat Online; Back to Basics Hammer Milling and Jet Milling .

Read More
Influence of Feed Size on Ag Sag Mill Performance

Mill Weight Power Top Size Figure 4: Feed Top Size vs. SAG Mill Performance 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 13:00 14:00 15:00

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Mine-to-Mill: The influence of feed size on AG/SAG milling ...

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).

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sag mill - tis-school.it

Sep 25, 2020  SAG mill throughput by altering blast design and crusher settings to provide an optimum feed size distribution to the mills. Hornblende A bulk flotation process using conventional cells produces a gold-bearing diorite was chosen for the study because it is the hardest ore at

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Understanding Size Effects of Semi-autogenous Grinding ...

Although it is well known and easily experienced that the feed size distribution influences the throughput and stability of operation of a semi-autogenous grinding (SAG) mill, the details are poorly understood since it is often only the input and output measurements that are used to identify unfavourable in-mill conditions. Load cells and power monitoring are sometimes used but are generally ...

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What's the Difference Between SAG Mill and Ball Mill ...

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.

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SAG Mill Autogenous and Semi-Autogenous Mills FLSmidth

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.

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SPARTA Rock Size Distribution Process IQ

Size distribution for Mill feed into AG or SAG mills; Crusher Performance monitoring; ROM feed into a plant; Final Product Control. Oversize detection. To maximise the benefit of the SPARTA system it is advised that it is incorporated into the mill control philosophy or

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what must the charge be in a sag mill

Jul 21, 2006 Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of

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Application of Operating Work Indices in Autogenous ...

AG/SAG mill product that needs additional grinding in the ball mill, or “Corrected Ball Mill Feed.” T2’ is the 80% passing dimension of the Corrected Ball Mill Feed. Figure 1. Comparison of the Particle Size Distribution Slopes Figure 2. Relationship Between the Transfer Size Distribution Slope and T 80 or AWi0/BWi Figure 3.

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Industrial Grinding Estimation of Blended Ore from ...

AG/SAG mill feed, trommel screen undersize product (-5.00 +0.00 mm), ball mill discharge and cyclone feed, overflow and underflow have been conducted in order to characterize the particle size distribution in the products and to carry out mass balancing of grinding circuits.

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Model:Bond/Barratt SABC Models - SAGMILLING.COM

The ball mill oversize feed factor (EF 4 BM) is always calculated with the rod mill work index for the optimum feed size and the ball mill work index for EF 4 BM. The model assumes that the calculated value of E ssbm + the specified contingency is greater than the sum of E sag + E peb ;

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Minerals Free Full-Text Optimizing Performance of SABC ...

This causes a higher variation in the feed rate and particle size distribution in the feed to the SAG mill, which results in a greater variation in the SAG mill power draw in the transition period when the pebble crusher is in operation or not. ... to crush pebbles for recirculation back to the SAG mill feed; and change the number of pebble ...

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