Sag Mill Power Draw

SAG Mill Grinding Circuit Design

A motor with around 1400 Horse Power is calculated needed for the designed task. Now we much select a Ball Mill that will draw this power.. The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The following shows how the size or select the matching mill required to ...

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. Models of this type do not predict the particle size distribution of a milled ...

Benchmarking: SAG Mill Power Draw Models - …

Benchmarking: SAG Mill Power Draw - Meadowbank. Muteb, P. & Allaire, J., Meadowbank Mine Process Plant Throughput Increase, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013. Power reported "at the DCS". DCS Power, kW Ball/Mill filling Morrell Model, kW Loveday/Barratt model, kW Austin model, kW cylinder+cone Austin model, kW …

TECHNICAL NOTES 8 GRINDING R. P. King - Mineral Tech

approach to modeling of mill power draw. Trans. Instn. Mining. Metall. (Sect C:Mineral Processing Extr Metall.) 105, January-April 1996 ppC54-C62. Austin 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 ...

Modelling SAG milling power and specific energy ...

the SAG mills throughput, power consumption and accordingly, specific energy. The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance. Some oper- ations have recognised an opportunity in the relationship between feed size and mill performance and manipulate feed size to …

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 three-foot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2.

A comparison of SAG mill power models

SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. This paper will compare SAG mill models by Morrell, Loveday (using "Power Numbers" published by Barratt) and Austin against several published mill surveys. The purpose of the comparison is to identify the ...

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 ...

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 …

Modelling the influence on power draw of the …

Measured vs predicted power draws of mills SAG mills with slurry pools – assumption in model (Eq. ) is that there is no slurry pooling and θ tp = θ tm. Download : Download high-res image (136KB) Download : Download full-size image; Fig. 10. Measured vs predicted power draws of mills SAG mills with slurry pools – assumption in model (Eq.

Autogenous and Semi-Autogenous Mills - …

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.

Grinding mills: how to accurately predict their …

In total 76 data sets were generated covering the power draws of ball, SAG and AG mills in the range 7 - 7900 kW. All three models were found to predict the power draw of the mills in the data ...

(PDF) The Prediction of Power Draw in Wet …

The Prediction of Power Draw in Wet Tumbling Mills . Thesis (PDF Available) · July 1993 with 963 Reads How we measure 'reads' A 'read' is counted each time someone views a publication summary ...

Publications - SMC Testing

Power Draw Of Wet Tumbling Mills And Its Relationship To Charge Dynamics - Part 1 A Continuum Approach To Mathematical Modelling Of Mill Power Draw Power Modelling Of Stirred Mills Predicting The Overall Specifcie Energy Requirements Of AG SAG Ball Mill And HPGR Circuits On The Basis Of Small Scale Laboratory Ore Characterisation Tests

SAG mills (semi-autogenous grinding mills) - Metso

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Metso to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso is the world leading supplier of gearless SAG mills operating globally.

SAGMILLING.COM .:. Subscription-based Services

SAG mill power draw models using techniques of Austin and Morrell, Ball mill power draw models using techniques of Morrell and Nordberg. The combination of a database capable of tracking thousands of grindability test results with models that can run hundreds of samples per second make the SAGMILLING.COM grindability models ideal for geometallurgy.

Optimizing your SAG mill operation - …

Optimizing your SAG mill operation. Posted by Matrix on 21st March 2007 Sanjeev Latchireddi, Chief Process Engineer – Grinding Americas, Outokumpu Technology, looks at the shift from ball mills to SAG mills. Nowadays, the more successful plants are those that have adopted effective and efficient strategies to optimize their plant operation. As the ‘heart of the plant’ could be viewed as ...

ONLINE SAG MILL PULSE MEASUREMENT AND …

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 energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding ...

Optimizing Performance of SABC Comminution …

This meant it was only operating at 56% of its maximum power, providing large room for improvement. The load on the ball mill was on the high side, with an actual operating power draw of 5300 kW, meaning it was operating at 90% of its maximum power. The combined power draw of the SAG mill and ball mill was 8658 kW, which caused partial over ...

Unlock SAG mill capacity with process control …

This ensures the SAG mill can continue to operate at higher speeds and increased power draw, without risking damage to the mill liners. Additionally, the instrument only allows the SAG mill to be operated at the limit for the current SAG configuration. To draw maximum power, liner design optimization is a necessary step to target the highest operating speeds after relines, while leveraging the ...

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 ...

SAGMILLING.COM .:. Subscription-based Services

SAG mill power draw models using techniques of Austin and Morrell, Ball mill power draw models using techniques of Morrell and Nordberg. The combination of a database capable of tracking thousands of grindability test results with models that can run hundreds of samples per second make the SAGMILLING.COM grindability models ideal for geometallurgy.

MEASURING THE EFFICIENCY OF THE TUMBLING MILL AS A ...

lifter configurations and operating parameters on the mill efficiency and performance. The MillTraj software was also utilized to simulate the outermost charge trajectories in terms of lifter profiles and mill speeds. For the mill with higher mill load and lower speed, the power draw of the mill differed slightly for the different lifters with the same face angles of 20o. Rail lifter drew ...

BrainWave: Control solutions for SAG mills

tion in the power draw. The challenge: To control your SAG mill so that it runs at peak efficiency. 03 Feeder speed Feed rate set point Weight set point PSD, mineral type, or ore hardness Rotation Recyle rates Feeder Belt SAG mill Feed rate Weight BrainWave BrainWave SAG mill control schematic Benefits Automatically account for changes in variation of par-ticle size or ore hardness Minimize ...

Autogenous and Semi-Autogenous Mills - …

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.

ONLINE SAG MILL PULSE MEASUREMENT AND …

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 energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding ...

SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy

SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / autogenous (S/AG) milling has become a common design for a variety of ore types with the advantages of being comparatively low capital cost and flexible for future expansion. The single stage SAG/AG milling option is ideal for starter projects with significant exploration and expansion potential. Currently a number of ...

SAG mills (semi-autogenous grinding mills) - Metso

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Metso to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso is the world leading supplier of gearless SAG mills operating globally.

Improved mill control at Lihir Gold Mine in Papua …

The grind curve work of Powell and Mainza (2006) and Powell et al (2009) demonstrated that the optimal volumetric mill filling for maximum federate does not necessarily align with maximum power draw, especially for high aspect SAG mills. It follows that SAG mill process control systems that target maximum SAG motor power will not necessarily result in the maximum milling rate. Instead, SAG ...

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