THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING A …

on. The operating power draw of the mill and, consequently, the motor torque consumed will vary during mill operation as the operating parameters vary. The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict

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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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Robust control of a SAG mill - ScienceDirect

In the plant under consideration, the major constraint on maximising the feed rate to the plant is the limitation on the SAG mill draw power. If the feed size distribution were to increase and/or the feed were to became harder, then more solid material would be held up in the SAG mill, which would draw more power.

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AN UPDATED DATA SET FOR SAG MILL POWER MODEL …

SAG mill, power model, power draw, Austin model, Morrell C-model, Hogg & Fuerstenau model This work was originally published as Paper № 123 in the XXVIII International Mineral Process Congress held September 2016 in Quebec City, Canada.

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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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Grinding mills: how to accurately predict their power draw

model treated AG,SAG and ball mills as a single class of devices whose power draw could be predicted with the same equations. Through a detailed investigation of the …

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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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Uneven SAG Mill Drive Power Draw - Grinding ...

The voltage always is consistent and there is no significant process change during SAG mill operation." I understand from this that you have an approximate 20A current draw difference between the two motors? I also assume that 7300kW is the TOTAL mill power draw, or is it the power draw of EACH motor?

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

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.

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Choosing a SAG Mill to Achieve Design Performance

commitments. This choice of the SAG grinding chamber is the subject of this paper and it will be shown that it is not enough to draw the required power, but to draw it at conditions of highest SAG efficiency in the commercial mill. It will also be shown from actual pilot plant results and 2

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Optimizing Performance of SABC Comminution Circuit of the ...

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-grinding. From experience in processing plants outside of China,

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Modelling SAG milling power and specific energy ...

the SAG mill critical speed; Pc = SAG mill power consumption (kW); % 600 +100 = % of the fresh feed in the size range 152 +25 mm. M. Silva, A. Casali/Minerals Engineering 70 (2015) 156–161 157 In fact the later can be modelled as a function of the others.

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Grinding Mills - FL

larger and larger mill sizes. It is thus no surprise that through our associa-tion with FL, we have been affiliated with the supply of some of the world's largest wet ball mills measuring 8.23m in Diameter and 13.10m long with an installed power of 18 650 kW, as well as the supply of SAG mills …

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ME Elecmetal Grinding Apps - ME Elecmetal · Global ...

SAG mills • Determination of your SAG mill's power draw characteristics. • SAG Mill Steel Charge Estimation tool provides an estimate of the percent steel in the charge of your SAG mill based on the power draw and the total charge volume. • Ball impact energy chart to determine the impact energy of balls as a function of mill diameters.

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Optimization of mill performance by using - SAIMM

mill absorbed power and ball filling degree. As indicated on the graph, a small variation in power could be the result of a significant variation of balls filling degree. As the ball wear rate depends directly on the surface of the media charge, a small variation in power will lead to an important increase of wear rate. The risk of underloading or

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SAG Mill Power Model - Grinding & Classification Circuits ...

Which power model is the most efficient to predict the correct power consumption in sag mill with change in process variables? I have developed a few dynamic simulators for different mineral/metal processing plants.

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(PDF) Determining relevant inputs for SAG mill power draw ...

Recurrent neural network models were developed to model semiautogenous grinding (SAG) mill power draw. This paper demonstrates how sometimes seemingly relevant inputs have no effect on the ...

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sagdesign.com

AG-SAG- Ball Mill Grinding Circuit Throughput Forecasting Ins. Liner Power Draw Ore SG Throughput ton/hr ton/day Capacity Installed Conditions MILL POWER DRAW AND THROUGHPUT CAPACITY : Circuit ton/hr Ore Hardness Grinding Task Specification SAG and Ball's Grinding Circuit Throughput Forecasting Mill Specification Grinding Task Mill Speed Charge

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BrainWave: Control solutions for SAG mills - ANDRITZ

What is more, stabilizing the load in the mill also stabilizes power draw. This enables the operator to manage power usage, eliminat - ing the energy waste that comes with a varia - tion in the power draw. The challenge: To control your SAG mill so that it runs at peak efficiency

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Optimization and Control of a Primary SAG Mill Using Real ...

pressure) and power draw of the mill. These tests were conducted at WvalC over the period Sep 2010 to Nov 2010 where 4 crash stop reference points where collected – see figure 3. A fairly linear load and power curve was obtained with R-squared statistics of 0.99 and 0.93 for the load and power to volume filling models respectively.

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Model Predictive Control for SAG Milling in Minerals ...

Water addition is an important variable for control of mill power draw. This has to be considered along with ore feed ... The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.

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MILLING CONTROL & OPTIMISATION - Mintek

MILLING CONTROL & OPTIMISATION MillSTAR. ... close to the maximum mill power draw. The power-load relationship ... Figures 8 and 9 on the right show results from a gold plant's SAG mill achieved with MillStar's Segregated Ore Feed Controller combined with the Power Optimiser:

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A Method of C alculating Autogenous/ Semi-Autogenous ...

of the energy required by a SAG mill. Put another way, the SAG mill energy required according to this statement, is 2.5 times more than the Ab value to produce the same degree of particle breakage. There is a speci fi c gravity factor that affects AG/SAG power draw. The lighter material, in …

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Calculate Sag Mill Power Draw - mayukhportfolio.co.in

Choosing a SAG Mill to Achieve Design Performance - Starkey ... the correct power required to grind ore in a SAG mill, by developing ore hardness variability ... power draw in the mill chosen be provided at optimum conditions as well. ... choice will determine if the …

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INCREASING SAG MILL CAPACITY AT THE COPPER …

The SAG mill appeared to be the bottleneck in the flowsheet as the power in the SAG was consistently high and approaching the full motor power, while the ball mills were consistently operating at less than 75% of installed power.

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mining ore sag mill power draw - Mineral Processing EPC

Ball Mill, Ball Mill Suppliers and Manufacturers at mining ore sag mill power draw. Mining Grinding Ball Mill for Ore/Ball Mill Machine .. Best seller Low Power Consumption factory steel ball mill for grinding copper magnetite chromite ore size.

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

mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential ...

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SAG Mill | Mill (Grinding) | Mining - Scribd

Figure 3 below gives the relationship between SAG Mill power in MW Vs US$ to buy the mill.5082 x + 0.5082x + 0.MUSD 5 4 3 2 1 0 4 5 y = 0. The design basis used was a 2. The SAG mill size should be checked by the manufacturer for accuracy.

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