Calculate Sag Mill Power Draw

sag mill power draw
sag mill power draw. Drive Power Calculations  bulkonline Forums: 201582 · .
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Mill (grinding)  Wikipedia
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. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their .
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Orway Mineral Consultants Canada Ltd. Mississauga, ON .
The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to  determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG .
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MacPherson Autogenous Grindability Test  Mining  SGS
The mill power draw, throughput and product size distribution are used to compute a specific energy input and the MacPherson autogenous work index (AWI). Although the importance to achieve steadystate in a grinding test is widely accepted (Bond tests), the MacPherson test remains the only smallscale AG/SAG mill test that offers this option.
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AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator .
SAG Mill Circuit Example – Gold Processing SAG mill circuit example for gold processing [image: (13563)] AG/SAG Mill. AG/SAG mills are normally used to grind runoffmine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
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Throughput optimisation in milling circuits
If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. The feed rate setpoint can then be tied into a SAG mill power optimisation strategy. SAG mill discharge control is quite involved due to few interactive variables, such as mill discharge sump level, classification .
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Optimizing your SAG mill operation  International Mining
It is imperative to ensure the efficient removal of both slurry and coarse pebbles (critical size) in order to ensure the efficient operation of AG/SAG mills. Elimination of the above mentioned material transport problems will allow the mill to respond truly in terms of power draw for changes in mill load which depends on feed ore characteristics.
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Choosing a SAG Mill to Achieve Design Performance
A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the threefoot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2.
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DESIGN OF THE KUBAKA GRINDNG CIRCUIT USING SPI AND .
circuit, comprised of a 6.1 m diameter x 2.74 m long SAG mill and a 4.1 m diameter x 5.5 m long secondary ball mill in closed circuit with cyclones, was built using SAG Power Index and Bond Ball Mill Work Index testing to determine the grinding energy requirements.
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Grinding mills: how to accurately predict their power draw
Grinding mills: how to accurately predict their power draw. . was found that combining the information from the literature enabled the development of a single logical equation for SAG mill power .
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C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "singlestage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
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(PDF) Understanding the effects of liner wear on SAG mill .
Understanding the effects of liner wear on SAG mill performance . The SAG mill disch . In both cases there is a discernible improvement in mill load behaviour and power draw with the optimised .
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Optimizing Performance of SABC Comminution Circuit of .
operating at 90% of its maximum power. The combined power draw of the SAG mill and ball mill was 8658 kW, which caused partial overgrinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an overpowered conﬁguration.
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SAGDesign Test  Starkey and Associates Inc.
The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S dBWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80.This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications.
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Achievement of High Energy Efficiency in Grinding Mills at .
expensive to draw more power per ton than operate the pebble crusher). SAG Mill Ball Charge The SAG mill was simulated to require a 1012% ball charge with a top size of 125mm. During the commissioning phase no balls were required to be added to the SAG mill to achieve the target throughput of 575tph.
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Operating work index is not the specific energy consumption
Oct 24, 2018 · To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to the motor, then multiplied by .
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Mill power draw models  SAGMILLING.COM
Mill Power Draw Models. The mill power draw models are used to predict how much power will be consumed by a particular type of mill, mill geometry and set of mill operating conditions. This power is transferred to the ore and used to predict the throughput when combined with the specific energy consumption models.
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Powerbased grinding models for design and geometallurgy
Dobby & Starkey method using a timed laboratory SGI Mill for SAG milling. Peter A. Day 2 08:3010:30 Nonstandard particle size distributions, the phantom cyclone and ball mill CF factors, geometallurgy and sampling an orebody. Alex D. 10:3011:00 Coffee break AM 11:0012:30 Mill power draw models for ball mills and SAG mills. Alex D.
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(PDF) Milling curves as a tool for characterising SAG mill .
The operation of AG/SAG mills is sensitive to mill filling, therefore developing grindcurves to relate mill filling to performance indicators such as throughput, power draw, and product size can .
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Modelling SAG milling power and specific energy .
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 expected power .
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A Method to Determine the Ball Filling, in Miduk Copper .
product fractions, specific power draw, and mill performance. Therein, load density and ball filling percentage in semiautogenous mill and its effect on the mills power draw is of great value. There exist several ways to calculating ball filling such as drawing out whole internal mill .
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How Mill Load/Charge is Estimated  Grinding .
Modern mills operate with load cells and mill optimizer's which synchronize the mill weight, power draw, ore feed and weight with density control. Where optimizers are not used, the rule of thumb for a overflow ball mill is a ball load up to about 12 inches below the trunnion discharge this allows bed expansion by the slurry filling the voids .
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Application of Operating Work Indices in Autogenous .
WAG/SAG, WBM are the respective power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2), which renders to the AG/SAG mill the credit for the fraction of the material .
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Power Drawbar: Easy Milling Machine AddOn [Bridgeport .
Easy DIY Power Drawbar for Milling Machines (Bridgeport / R8 / Kurt Style) Here's the power drawbar perched atop my Industrial Hobbies Mill. Click this image for a MOVie file of the power drawbar in operation: Requires QuickTime! I don't know how I got by without one, now that I have it.
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Autogenous and SemiAutogenous Mills  ScienceDirect
9.4. AG/SAG Mill Power. In designing crushing–grinding flow sheets, correct estimations of mill power draw are important as it serves as one of the deciding factors for selecting an option between AG/SAG mills. In most cases, the circuit with the least or optimal power consumption is the preferred choice.
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(PDF) Determining relevant inputs for SAG mill power draw .
Determining relevant inputs for SAG mill power draw modeling . robust controllers were all developed and tested—each providing tight control over the SAG mill power draw by adjusting the feed .
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CALCULATION OF THE POWER DRAW OF DRY .
For all model based methods, a reliable method to calculate mill power draw for a given mill is required for the calculation of power draw. Morrell (1996) proposed a mathematical model for autogenous, semiautogenous and ball mills which is based on the motion of grinding charge inside the mill. He also verified his approach with
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Model:Bond/Barratt SABC Models  SAGMILLING.COM
As with most models, the power split between the SAG and ball mills is evaluated and the transfer size (T 80) necessary to balance the power draw between the two stages is estimated. If that transfer size is within the specified limits, then the calculation proceeds to calculate the E SAG .
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MODELING THE SPECIFIC GRINDING ENERGY AND BALL .
Ball mill power draw predicted from the Denver slide rule, kW 0 200 400 600 Calculated ballmill power draw from the m odel derived, kW Data compared Line y=x Fig. 2. Comparison of the ball mill power draw from the Denver slide rule and the proposed model. Dashed line corresponds to y=x.
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Optimizing Performance of SABC Comminution Circuit of .
operating at 90% of its maximum power. The combined power draw of the SAG mill and ball mill was 8658 kW, which caused partial overgrinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an overpowered conﬁguration.
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