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to 3.866. For each simulation the feed rate was adjusted until the total load volume in the SAG mill was 25 . The predicted mill power draw and crusher power draw were combined and divided by the feed rate to provide the specific energy consumption. The results are shown in . Figure 3. Figure 3 The relationship between A b and specific energy

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The combined power draw of the SAG mill and ball mill was 8658 kW which caused partial over-grinding. 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 over-powered conﬁguration. The installed power draw of 630 kW

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Dec 12 2016 · If P is less than 80 passing 70 microns power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to

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If one looks back over the last 70 years or so there is a fairly common theme to most of tumbling mill power draw models (Bond 1961 Hogg and Fuerstenau 1972 Arbiter and Harris 1982 Austin 1990).This is that the models used the charge shape shown in Fig. 1 in which it was assumed that all particles moved with same rotational rate and that the slurry phase was not explicitly considered.

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by the SAG millthe main constraint attributable to the operable speed ranges post reline that reduced the maximum power draw well below the installed power. Typically at startup post SAG mill reline the maximum operable speed ranges are reduced to minimise direct shell impacts due to the steeper face angle of the lifters.

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Morrell's power model assumes the mill charge shape as shown in Fig. 9 and the mill gross power draw to have two components net power and no-load power. Download Download full-size image Fig. 9. Simplified AG/SAG mill charge shape (Napier-Munn et al. 1996).

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Development of models relating charge shape and power draw to SAG mill operating parameters and their use in devising mill operating strategies to account for liner wear. Article.

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Bibliography Mill power draw modelsSAGMILLING . The three SAG mill models are benchmarked and reviewed in Doll A.G. A comparison of SAG mill power models Procemin 2013 Austin SAG Model. The Austin SAG model was published in Austin L.G. A mill power equation for SAG mills Minerals Metallurgical Processing Society for Mining

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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)

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

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SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. 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.

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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

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SAG MillSemi-Autogenous Grinding Mill A semi-autogenous grinding mill or Sag mill is responsible for grinding materials from large chunks into small usable pieces for processing. The Sag mill is usually part of the primary stage in the grinding process.

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AG mill power draw (kW) 4805 4812 3597 3777 . Rock load ball charge level and ball size were studied in the SAG mill circuit as well as an optimum circuit configuration for the ball mill

Get Price### Multi-component AG/SAG mill modelScienceDirect

Morrell's power model assumes the mill charge shape as shown in Fig. 9 and the mill gross power draw to have two components net power and no-load power. Download Download full-size image Fig. 9. Simplified AG/SAG mill charge shape (Napier-Munn et al. 1996).

Get Price### 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.

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A line drawing of the Fort Knox SAG mill liner configuration and spare liners awaiting installation. Five and one quarter inch steel grinding ballscannon ballsoccupy 8 of the mill volume and are consumed in the grinding action at the rate of 600 000 pounds per month.

Get Price### Improving Energy Efficiency Via Optimized Charge Motion

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

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any item on the list to start drawing the circuit. There are six unit process that the user can add to their circuit. They are as follows 1. Feed 2. Ball Mill 3. Semi-Autogenous Mill (SAG Mill) 4. Hydrocyclone 5. Sump Pump 6. Screen Apart from these six unit processes there are some added features that makes the simulator easy to use.

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to 3.866. For each simulation the feed rate was adjusted until the total load volume in the SAG mill was 25 . The predicted mill power draw and crusher power draw were combined and divided by the feed rate to provide the specific energy consumption. The results are shown in . Figure 3. Figure 3 The relationship between A b and specific energy

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Jun 03 2020 · When the first 42 foot SAG mill was designed and manufactured around there were a lot of issues with getting such big equipment pieces fabricated and machined. The costs go up exponentially as we try to push the envelope.

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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 is 50 percent of the

Get Price### Mill power draw modelsSAGMILLING

You must manually check the motor's tent diagram to confirm that the predicted power draw is actually within the motor's capability at the indicated speed. Liner and grate design. The design of mill liners and SAG mill discharge grates will have a large effect on how efficiently the mill

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Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG ball and HPGR mills with single or double pinion the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs reducing the harmonic currents on the motor to extremely low levels.

Get Price### 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)

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