sag mill poolling

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(PDF) Slurry flow in mills with TCPL — An efficient pulp ...

Due to increase in without overloading the mill in either power or slurry the load, the mill draws more power and once it reaches pooling. The mill load of 27% was estimated at the set point (in this case 2900 kW) the control system 450 tph without excessive slurry on surface of the reduces the feed rate to bring the system back to charge.

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Optimizing your SAG mill operation - International Mining

All AG/SAG mills using radial or curved pulp lifters suffer from inherent material transport problems such as slurry and pebble pooling, which decrease throughput and increase energy consumption.

Improved Relationships for Discharge in SAG/AG Mills

Semi-autogenous mills (SAG) are very similar to autogenous mills (AG) but, like ball mills, use steel media to aid in grinding. SAG mills are typically operated with feed water and ore entering through a feed trunnion and into the mill shell, where breakage occurs.

Effects of slurry pool volume on milling efficiency ...

Tangsathitkulchai hypothesised that for an overfilled mill (see Fig. 1), a pool of slurry (1) forms at the base of the ball mill charge.A fraction of the ball mass (2) is submerged in the slurry. This fraction works against the stationary suspension of slurry causing a liquid drag on the interstitial particles.

Developments in the understanding of South African style ...

TABLE 1 Comparison of RoM and SAG mill operating regimes AG/SAG South African RoM Speed, % critical 70-80% 75 -90% Charge Filling, % total mill volume 20 -30% 35 45% Bali filling, % total mill volume 4-15% 15 35% Internallength 3-5m 5 -12m Aspect ratio, diameter/length 0.7 -2 0.5 -0.8 Recycle stream Trommel oversize Cyclone underflow/fine ...

(PDF) Slurry pooling and transport issues in SAG mills ...

The mill in the left images was Open vs. closed circuit converted from AG milling to RoM ball milling, and the effect on the In a set of work conducted at Morila Gold mine, an AngloGold slurry hold-up is dramatic, with the pooling and stickiness apparent in Ashanti/Randgold Resources joint venture in Mali, the SAG mill was the AG mode being ...

(PDF) Slurry pooling and transport issues in SAG mills

If the mill cannot effectively remove the slurry it forms an internal slurry pool, which reduces the milling efficiency and capacity to produce fine particles by up to 20% (Latchireddi and Morrell,...

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Modelling the influence on power draw of the slurry phase ...

Citic SMCC has 9 SAG mill data sets from mills which were found to be operating with varying degrees of slurry pooling. If it is assumed that the mills were operating normally, ie without slurry pooling and θ tp = θ tm, then the predicted power draws as compared to the measured values are as shown also in Fig. 9 .

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Modelling SAG milling power and specific energy ...

mill diameter, mill length, grates openings, and pebble ports size; the power equation is also function of all the operational variables selected for this study. The applied force is a function of the mass inside the mill and it is composed of balls, ore and water. The ball charge is a function of the bulk fraction of the SAG mill volume (Jb)

Modelling SAG milling power and specific energy ...

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 specific energy model which do not consider the projected feed size distribution it is likely that this mill will reach the ...

Sag Slurry Pooling | PDF | Mill (Grinding) | Speed

Sure enough, upon entering the mill after a crash stop, a massive slurry pool was found in the mill. Figure 4 Los Bronces SAG mill 2 discharge grate As illustrated in Figure 4, the mill has classic massive pebble porting, typical of the operations aiming for …

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Mill Filling Tool Dashboard. The new Mill Filling Prediction (MFP) tool is a soft sensor (a mathematical model that act as a sensor) to provide information about the mill's contents and enable it to be controlled closer to its maximum capacity. The MFP tool is developed by Dr Marko Hilden, a Senior Researcher at JKMRC.

Turbo Pulp Lifter (TPLTM) - An Efficient Discharger to ...

SAG mill was crash stopped using the air brakes. Figure 6 shows the snapshot of DEM simulation and the picture taken after crash stop at 9 O'clock. Figure 5: Pebbles carry-over inside the pulp lifter a) in 36-ft SAG mill, and b) DEM simulation. This work confirms that there is a significant quantity of coarse pebbles always remaining inside

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GROSS POWER CALCULATOR - SMC Testing

(slurry pool) is predicted from mill design and slurry flow data and its impact on power draw is then predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge

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Slurry Pooling and Transport Issues in Sag Mills

Slurry pooling, excessive accumulation of slurry in the mill, and the associated loss of throughput and grind, are well recognised on low- aspect, single-stage SAG mills.

Developments in AG/SAG Mill Modelling - ResearchGate

DEVELOPMENTS IN AG/SAG MILL MODELLING S.Morrell, W.Valery, G.Banini and S.Latchireddi JKMRC, Isles Road, Indooroopilly, Qld 4068, Australia ... slurry pool 90 h1 h2 Figure 4: Charge Shape Used in ...

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Improving Autogenous/Semi-Autogenous Grinding …

pool formation, flow-back of pebbles increases the quantity of critical size material in the mill. The amount of pebbles passing through the grate increases with the angle of the grate. A DEM simulation of this scenario for a 36 ft diameter SAG mill is shown in Figure 5. The inefficient usage of energy due to the flow back phenomena are ...

Benchmarking: Yanacocha Single-stage SAG Mill - …

Also "Significant slurry pooling was observed in the Yanacocha SAG mill during both of the surveys." Grindability test results. Grindability measurements of survey samples are are given as: Bond ball mill work index is reported as: 17.53 kWh/t (106 µm closing screen, assume P 80 =75 µm), 16.52 kWh/t (212 µm closing screen, assume P 80 =155 µm).

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Ball Mill Critical Speed & Working Principle - YouTube

https:// Learn about Ball Mill Critical Speed and its effect on inner charge movements. The effect of Ball Mill RPM s...

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