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Optimization of mill performance by using

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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catia design of ball mill - SlideShare

Apr 11, 2015· Understanding Ball Mill Sizing. PDF [1000 KB] · First Page. Ball Mill Design - Power Draw For other tools like this click Online Tools, Notes on Ball Mill Design - Power Draw. Power Draw is steady running power requirement ... ignoring drive-train ... Trommels | Sag Mill Trommels | Ball Mill Trommels | Rod Mill ... For more than 30 years ...

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SAGMILLING.COM .:. Articles

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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Grinding Mill Computer Model

Approximate mill diameter is derived from: Power =5.*6115 DL24. 6* La= * D where a is the aspect ratio L/D derived from a regression equation on 25 manufacturers' mill size and power relationships For SAG mills the equation becomes Power=(5.6115+%balls*0.1438)*D24. 6* L Mill Critical speed Crit Crit D = 42.3 n - revs per min nC= s*Crit Cs is ...

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

Apr 01, 2016· However, from experience gained with single stage AG/SAG mills it became clear that even grate discharge mills can accumulate slurry at the toe of the charge and this can considerably affect power draw depending on the extent of the slurry pool (Morrell, 1989, Morrell and Kojovic, 1996). Hence it can be concluded that the extent of the slurry ...

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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 the 2.5 specifi c gravity (SG)

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The Effect of the Grinding Charge Trajectory on the ...

and optimal grinding charge trajectory for the SAG, Ball and Rod Mills. • Identified potential benefits could be obtained with an ideal grinding media charge, mill speed as well as optimisation of lifter profile (specialty lifter face 20 angle) which is directly related with mill power draw, internal motion of mill charge,

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Model Predictive Control - Rockwell Automation

may be measured in SAG mill circuits and used for control purposes: The weight of the ore and water needs to be controlled within the accepted operating range – too high and the mill becomes inefficient, too low and the autogenous effect is not used properly. Water addition is an important variable for control of mill power draw.

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An improved method for grinding mill filling measurement ...

The fraction of mill volume occupied by rocks, grinding media and slurry in grinding mills are dominant factors influencing AG and SAG mill power draw and grinding rate. Hence accurate mill filling measurements are needed for modelling mills. To that end, it is usually necessary to enter the confined space of a grinding mill, a task that ...

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CMD Consulting uses Rocky DEM power calculations to ...

SAG mill design CDM Consulting used to test Rocky DEM power draw Empirical Model Rocky DEM Model Figure 1 - Morrell C-model for mill power draw Rocky calculations for power draw were shown to accurately replicate Morrell's C-model for power draw, an increasingly critical component in mill design validation

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Optimizing Performance of SABC Comminution Circuit of the ...

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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Dynamic Modeling and Simulation of SAG Mill Circuits …

where two SAG mill power models are developed. The first model calculates the mill power draw by combining several individual data-driven algorithms. The second model uses historical data to forecast the mill power draw in advance. These data-driven methods can make high

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Tega DynaMax - Tega Industries

Tega DynaMax. Tega has more than 500 grinding mills lined globally in SAG, AG, Ball, Primary and Secondary milling applications lined with Rubber Liner and Rubber-Alloy composite liners. Mill liner is the flagship business of Tega with customers spread over 68 countries with DynaMax range. Tega DynaMax range comprises of an innovative product ...

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DYNAMIC MODELLING OF A SAG MILL-PEBBLE CRUSHER CIRCUIT BY ...

In a semi-autogenous grinding (SAG) mill and pebble crusher circuit, the behaviour of the comminution process is non-linear and time-varying due to wear and variations in the feed material. To describe such a complex system, data-driven models were introduced, along with a case study of a SAG mill circuit in Copper Mountain, British Columbia, Canada. This paper …

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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 that had been already ground to final product (Q1).

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Advances in Discrete Element Method Application to ...

slice of SAG mill (Cleary 2001a) can be simulated to predict full mill power. A further advance in DEM model would be to change the shape of particles from disk or sphere to non-circular and non-spherical shape. When advancing the DEM model from 2D disk Figure 1. comparison of actual power and predicted power draw using DEM for different mill ...

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final project report

the SAG mill is drawing approximately 236-kW less power than before while maintaining the same level of production. In the first month there was extreme cycling and operators had to learn more. However, the power consumption is 0.3-1.3 kWh / ton lower than before. The actual SAG mill power draw is 230-370 kW lower.

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Sag Mills Australia - csaustin.org

a comparison of sag mill power models - sagmilling.com. sag mill power draw models are used in mill design and grinding circuit.. m. 2002 selection and sizing of autogenous and semi-autogenous mills, mineral kruttschnitt mineral research centre, indooroopilly, queensland, australia,ag mills for sino iron project australian mining,nov 26, 2007 ...

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MILLING CONTROL & OPTIMISATION - Mintek

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 ... Mill Power Optimisation results for Case Study 2 Figure 9: Feed Control Distribution for Case Study 2.

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Services - CMD Consulting

Mill power draw modelling; Effect of mill speed, mill filling, ball charge and slurry density. Fully autogenous (AG) versus Semi-Autogenous (SAG) milling. Morrell power model versus other published models; Session 6. Circuit Modelling and Engineering Trade Off Studies; Using Comminution Data in JKSimMet.

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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 charge dynamics, coupled with ...

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(PDF) SAG mill power draw simulation using variance ...

Using Monte Carlo simulation showed that the mean power draw of Sarcheshmeh SAG mill is about. 9349.75 kW with a standard deviation of 983.2 kW, with the highest frequency occuring between 9058.5 ...

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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 semi-autogenous 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 load, taking photographs from load

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Mill drives: the desire for increased power and the ...

SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

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Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

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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Advanced Controller for Grinding Mills: Results from a ...

cyclone is returned to the ball mill. Balls are added periodically to the mill on a per shift basis or when the power draw drops below a preset value at nominal operating conditions. SmartGrind was installed on Mill No.5 and its performance was compared to the neighboring Mills 3 and 4.

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A comparison of SAG mill power models - CEEC (Coalition ...

SAG mill power draw models are used in mill design and grinding circuit modeling 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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An improved method for grinding mill filling measurement ...

Abstract The fraction of mill volume occupied by rocks, grinding media and slurry in grinding mills are dominant factors influencing AG and SAG mill power draw and grinding rate. Hence accurate mill filling measurements are needed for modelling mills. To that end, it is usually necessary to enter the confined space of a grinding mill, a task that involves a degree of …

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AG/SAG/Ball Mill

AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator. Shell Sizing Parameters. Parameters. Value . Value . Mill Shell Inside Diameter: [m] [ft] Mill Shell Inside Length: [m] [ft] Shell Heads Cone Angle: [degrees]

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Industrial Grinding Estimation of Blended Ore from ...

between the AG/SAG mill and the ball/rod mill, power draw of the latter being relatively stable. In response to the variation in feed size and hardness, the mill feed rate has to be changed significantly [7]. The comminution processes such as crushing, grinding, screening and classification are commonly

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ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION ...

Jun 24, 2006· A 35% decrease in the SAG mill power draw from 3,908 HP to 2,526 HP (2,915 kW to 1,884 kW) was recorded. This equates to a 47% decrease in SAG unit energy consumption from 8.98 kWh/ton to 4.74 kWh/ton. A 11% decrease in SAG mill speed was observed indicating optimized ball strikes.

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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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RESPONSE OF PRIMARY GRINDING MILL PERFORMANCE TO …

adjacent girth gear or on the shell of the mill. Alternatively, power could be provided by a suitably designed battery box. Gearbox/stepper motor assembly . For the prototype unit installed on a SAG mill, duplicates of the gearbox and stepper motor assembly were manufactured and swapped out at various intervals for inspection.

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