sag mill power draw


SAG mill Ball mill 700 tph P80 = 0.060 mm :6.7 MW :12 MW F80 = 80 mm N Line 2 Primary Grinding Spillage Cyclones Scat return Water jet 25 l/s BALL D=5m L

SAG power draw survey tabulation This LibreOffice spreadsheet contains the raw data used to create Table 1 and Table 2 of the paper "An updated data set for SAG mill power model calibration", presented at IMPC 2016 in Quebec City, Canada in September, 2016....

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Mill (grinding)

2019-10-2 · 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 large diameter and short length as compared to ball mills.

2016-5-31 · 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 ...

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CMD Consulting uses Rocky DEM power calculations to

2016-1-13 · CMD Consulting uses Rocky DEM power calculations to validate mill designs In a typical mine, the liners and lifters of a comminution mill are expected to last only 6-9 months and can cost upwards of US$500,000 to US$1,000,000 to replace. It is therefore important that the design of these components be carefully considered to

2018-8-8 · 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. This operational approach severely limits available power draw by the mill to maintain higher throughputs for competent ores....

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Grinding mills: how to accurately predict their power

Grinding mills: how to accurately predict their power draw. 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

2010-4-23 · Mill power Usually, plant operators use mill power readings as an indicator of ball filling degree and, often, try to keep it at the maximum level. It is well known that the mill absorbed power depends on operating parameters other than ball level, such as pulp density and liner configuration. Figure 2 shows that there is no linear relation between...

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A Method of C alculating Autogenous/ Semi-Autogenous

2018-2-20 · 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 the 2.5 specifi c gravity (SG) range, will require more energy to grind to the same transfer

2018-6-26 · 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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Simulation of Power-Draw and Fill Level for a Semi

2012-1-5 · Figure 2. SAG mill simulator in Matlab-Simulink. 3.1 Results Examples of the simulation results are presented in Figures 3 and 4. These figures respectively show the response of the power-draw and the fill level for the Magne approach [3]. The results are the product of 10% flow change related to the nominal operation conditions (1200 t/h ). 4.

2012-9-18 · 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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BrainWave: Control solutions for SAG mills

BrainWave Control solutions for SAG mills. 02 The solution: Measure. Control. And profit. 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

2016-6-21 · Model Predictive Control for SAG Milling in Minerals Processing | 5 Model Predictive Control on a SAG Mill and Ball Mills 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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AMIT 135: Lesson 6 Grinding Circuit Mining Mill

SAG Mill Circuit Example Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine 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

2019-10-14 · The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...

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2018-4-26 · (slurry pool) is predicted from mill design and slurry flow data and its impact on power draw is then 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

2019-3-1 · Mill Power Draw Model Bibliography. Mill power draw models are used to predict the usable power draw that a particular mill will generate. 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....

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Optimizing Performance of SABC Comminution Circuit of

2017-5-13 · 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, 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.

2019-5-2 · SAG Mill power The SAG mill power draw realized in the operation of the plant on a blend similar to the simulation data shows the mill consumes less power than predicted without the need for pebble crushing to 12mm (if pebble crushing was performed the power draw on the mill could be lower, however it is less ...

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Uneven SAG Mill Drive Power Draw

2019-10-5 · As you can understand from high standard deviation, the difference is not consistent but in 93 % of operation times, drive number 2 draw more current in both forward and reverse rotation. Power draw is about 7300 (kW) (max of Power draw is 8200 kW). The voltage always is consistent and there is no significant process change during SAG mill

2014-10-1 · power draw. The most frequently used power-based methodologies for calculating energy requirements for comminution circuits using AG/SAG mills are concisely presented in the following section. This paper describes the Orway Mineral Consultants (OMC) approach determining power requirements for thto e...

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SAG Mill Power Model

2019-10-11 · 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. Prediction of correct sag mill power consumption with a change in ore hardness, solid


existing models to accurately predict grinding mill power draw. This conclusion was supported by Morrell (1993) who evaluated a number of models using a large data base of power draws (Figure

Optimization of the Design of SAG Mill Internals Using

2015-2-13 · particles, mapping of power draw, impact energy dissipation and shear work done by balls and particles on the liners as a function of distance down the mill axis. Figure 7 shows a plot of simulated power draw (per unit length of mill) beginning at the feed end of the mill (slice 1) and proceeding to the discharge end (slice 17).