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 mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.
The classification at the grate for both slurry apertures and pebble ports has substantially extended previous research studies. The results show clear trends in relation to the radial position, aperture size and particle size. The thesis has provided improvements to …
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 …
Slurry pooling, excessive accumulation of slurry in the mill, and the associated loss of throughput and grind, are well recognised on lowaspect, single-stage SAG mills. However, it is becoming apparent that a wide range of the high-aspect mills also suffer from pooling issues. This is associated with the high throughput of mills treating less competent ores, excessive pebble porting, and large ...
slurry and pebbles in SAG mills with pebble circuits. The Outokumpu patented Turbo Pulp Lifter (TPLTM) aims at eliminating the inherent material transport problems to ensure good grinding conditions. Recent installation of TPLTM in a 26-ft SAG mill has proven these claims by reducing the specific power consumption while increasing the mill ...
Hi - welcome to 911, Turbo Pulp Lifters have been shown to be effective at discharging slurry where other designs have failed. I believe the Cortez gold mine …
not accurately measured – for example slurry pooling in the SAG mill and recirculating loads around cyclones. MetSMART models these factors, while the expert system cannot. While samples can be taken around the plant to measure assay and sizing information, it is not always possible to measure every stream. Calculating
Is your AG or SAG mill slurry pooling? Fix the problem immediately…do the calculation yourself! Are you achieving the correct final product size for optimum liberation, or do you need to make variable changes? Don't waste hours waiting for lab results. Do the calculation now! Is your feed size optimum for the grinding plant? Do the ...
The World's first industrial installation of TCPL in 26 ft diameter sag mill at Wagerup Refinery of Alcoa world alumina has proved the advantages of TCPL at industrial scale. With TCPL, the mill throughput has increased from 390 (with RPL) to 470 tph on average by ensuring the best grinding environment inside the mill without slurry pool.
Slurry pooling is common in closed-circuit RoM mills, and the detrimental effect of this has been dramatically demonstrated at ALCOA with a mill throughput increase of over 20%.
What is the best Practices to eliminate flow-back and carryover of slurry and solids in a SAG/AG Mill? Are curved Pulp Lifters as Vortex (Bradken) and Turbo Pulp Lifter (Outotec) the best way to approach this issue? Are you aware of any similar product, or an …
SAG mill speed to fast for fine feed size. Solution: • Slow down SAG mill to increase the mill load to around 25%, thereby using more of the SAG power to do fine grinding, not impact. A 3-5% improvement in grind size could be achieved through the control of SAG load - at the same throughput.
5.6.5 DEM prediction of dry mill power 161 5.7 Effects of slurry pool on mill power 164 5.7.1 Measured net power draw of the Wits pilot mill 164 5.7.2 Morrell's model of slurry pooling effect 165 5.7.3 Tangsathitkulchai's model of slurry pooling effect 167 5.7.4 Piece-wise function model of …
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. The TPL completely eliminates slurry pooling and pebble pooling problems and ensures the best grinding conditions, thus allowing AG/SAG mills to ...
A well-recognized issue with low-aspect, single-stage SAG mills is the phenomenon of slurry pooling, or excessive accumulation of slurry in the mill. Impact grinding is reduced considerably since the falling material splashes into a slurry pool …
1. Introduction. Mill filling has a dominant effect on grinding mill performance (Apelt, Asprey and Thornhill, 2001), and therefore, its accurate measurement is vital for modelling grinding mill performance.Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ...
The effects of slurry pooling on ball milling have been investigated. Product fineness was found not to be a function of slurry pool volume. High ball filling J and slurry filling 1.0 ≤ U < 1.3 led to high production of fines. From a batch milling perspective, slurry pool is undesirable for effective grinding.
Slurry viscosity has been observed to range from 0.025 Pa s for primary ball mill discharge and SAG mills up to 0.1 Pa s for AG mills which have much higher concentrations of very fine (−37 μm) particles (Shi and Napier-Munn, 1996). In general, the slurry rheology is non-Newtonian with a strong variation of viscosity on the shear rate ...
Slurry pooling minimization in the OED Mill is facilitated by a novel grate-supporting spider. The Outotec spider design is conical and mounted to the discharge-end shell flange. This improves structural stiffness and ensures the mill is open all the way to the shell diameter. Hydrostatic pressure is highest at the locations furthest from the ...
ABSTRACT. 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. However, it is becoming apparent that a. wide range of the high …
A well-recognized issue with low-aspect, single-stage SAG mills is the phenomenon of slurry pooling, or excessive accumulation of slurry in the mill. Impact …
The slurry level in AG/SAG and ball mills has an influence on their power draw, which in some instances can be profound. This is particularly the case with so-called slurry pooling in AG/SAG mills which can result in significant lowering of power draw. From a predictive
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 …
LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...
5. Simulate the throw of the charge in mills to avoid direct hits on the liners to prevent excessive wear. 6. Check for slurry pooling in SAG Mills to avoid a drop in throughput. 7. Regular screen maintenance. 8. Regularly construct Recovery curves to calculate kinetics. This will tell you if your flotation cells are underperforming. 9.
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.
AG/SAG mills and the slurry discharge mechanism is still not well . ... W., 2006, "Slurry pooling and transport issues . in SAG mills", Proceeding, SAG 06' Conference, September,
The effects of slurry pooling on ball milling have been investigated. •. Product fineness was found not to be a function of slurry pool volume. •. High ball filling J and slurry filling 1.0 ≤ U < 1.3 led to high production of fines. •. From a batch milling perspective, slurry pool is undesirable for effective grinding. •.
Slurry pooling and transport issues in SAG mills. Malcolm S Powell. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER. Slurry pooling and transport issues in SAG mills. Download.
xHigh slurry pooling was observed in the SAG mill following start-up xThe cone crusher product tended to be quite mono-sized, resulting in high recirculating loads of pebbles and was not conducive to down-stream ball milling xThe ball mill recirculating …
"The operator can be alerted when undesirable conditions such as slurry pooling are imminent, reducing the risk of the mill being overloaded," he said. "Estimation and display of steel ball level reduces the need to perform regular manual measurements which require stopping and sometimes entering the mill, and, therefore, reduces the ...
Slurry pooling, excessive accumulation of slurry in the mill, and the associated loss of throughput and grind, are well recognised on lowaspect, single-stage SAG mills. However, it is becoming apparent that a wide range of the high aspect mills also suffer from pooling issues. This is associated with the high throughput of mills treating less competent ores, excessive pebble porting, and large ...
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