# a mill power equation for sag mills

Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills can be calculated from mp 50 tph mobile stone crusher price in india

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### a mill power equation for sag mills

In these circuits the SAG mill is the largest energy consumer In many engineering projects either a power equation andor a specific energy equation are used for the designing of these mills but not always with acceptable results

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### a mill power equation for sag mills

Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills can be calculated from mp

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### a mill power equation for sag mills

A mill power equation for SAG mills A mill power equation for SAG mills Export Citation × Citation Style APA Austin L G 1991 A mill power equation for SAG mills Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills

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### a mill power equation for sag mills

A Ball Mill Critical Speed actually ball rod AG or SAG is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside surface and no balls will fall from its position onto the shell The imagery below helps explain what goes on inside a mill as speed varies

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### a mill power equation for sag mills

The three SAG mill models are benchmarked and reviewed in Doll AG A comparison of SAG mill power models Procemin 2013 Austin SAG Model The Austin SAG model was published in Austin LG A mill power equation for SAG mills Minerals Metallurgical Processing Society for Mining Metallurgy Exploration February 1990 Morrell Models

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### a mill power equation for sag mills

of the energy required by a SAG mill Put another way the SAG mill energy required according to this statement is 25 times more than the Ab value to produce the same degree of particle breakage There is a speci ﬁ c gravity factor that affects AGSAG power draw The lighter material in

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### a mill power equation for sag mills

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 mills that are operating without a slurry pool This is because by definition overflow mills operate all of the time with a slurry pool

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### a mill power equation for sag mills

SAG is an acronym for semiautogenous 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 128m in diameter powered by a 28 MW 38000 HP motor

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### a mill power equation for sag mills

The power calculated on using equation 1 Bond 1961 Rowland and Kjos 1978 relates to 1 Rod milling – a rod mill with a diameter of 244 meters inside new liners grinding wet in open circuit 2 Ball milling – a ball mill with a diameter of 244 meters inside new liners grinding wet in open circuit

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### a mill power equation for sag mills

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 813 Power drawn by ball semiautogenous and autogenous mills A simplified picture of the mill load is shown in Figure 83 Ad this can be used to establish the essential features of a model for mill power

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### a mill power equation for sag mills

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 Read More grinding mills power consumption kw YouTube Mar 27 2019· This video is unavailable Watch Queue Queue Watch Queue Queue Read More SAG mill Archives International Mining

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### a mill power equation for sag mills

Oct 12 2017 · In ancient time the mills were operated with muscle power by hands water animals and wind They were totally based on the mechanical energy by natural resources and living are many types of mills which are used in the grinding industries Today we will discuss about two important mill sag mill and ball mill

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### a mill power equation for sag mills

A mill power equation for SAG mills A mill power equation for SAG mills Export Citation × Citation Style APA Austin L G 1991 A mill power equation for SAG mills Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills

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### a mill power equation for sag mills

Scw solid concentration by weight fraction in the SAG mill feed Jb balls charge bulk fraction of the SAG mill volume NNc fraction of the SAG mill critical speed Pc SAG mill power consumption kW −6″ 1″ of the fresh feed in the size range −152 25 mm

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### a mill power equation for sag mills

Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills can be calculated from mp

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### a mill power equation for sag mills

This value corresponds to about 15 steel in the SAG mill and a load of about 35 and represents the motor power required and the shell is sized to suit that power Lower steel and charge volume loads draw less power but the chamber will draw power up to this maximum load

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### a mill power equation for sag mills

LG A mill power equation for SAG mills Rod and ball mills in Mular AL and Bhappu R B Editors Mineral Processing Plant Design mixing model for the mixing pattern is more appropriate than that based on the perfectlymixed region

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### a mill power equation for sag mills

predictions made by two published mill power draw models for SAG mills Austins SAG model and Morrells Cmodel A third model Hogg and Fuerstenau is fit to each survey and the principal fitting parameter is tabulated Power measurement The nature of electrical and mechanical networks is that power is lost to various types of inefficiency as

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### a mill power equation for sag mills

stage ball mills rod mills or AGSAG mills when calculating power according to the Bond Third Theory method Rod mill and AGSAG mill products are similar and tend to be not as steep as a 05 slope when plotted on loglog paper This is because the particle size distribution PSD these mills

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### a mill power equation for sag mills

Gearless mill drive GMD technology has further expanded the use of large SAG milling allowing Metso to produce the worlds 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

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### a mill power equation for sag mills

Jan 30 2019 · Mill power models have been used in a variety of ways in industrial practice since power directly equates to throughput and fineness of ground product We first start with HoggFuerstenau Power Model and show how this model successfully predicted the power draw of many grinding mills in several mining operations

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### a mill power equation for sag mills

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

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### a mill power equation for sag mills

Ball mill A typical type of fine grinder is the ball mill The power predictions for ball mills typically use the following form of the Bond equation fred bond ball mill power draw equations fred bond ball mill power draw ball mill can be either wet or dry designs

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### a mill power equation for sag mills

The T80 also determines the SAGball mill power split Adjustments of the SAG T80 up to 34 mm and down to 300 microns are common The balance of the required power is provided by the ball mill

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### a mill power equation for sag mills

A mechanistic state equation model for semiautogenous mills The model is based on results obtained under stationary conditions using a pilot SAG mill and communicated in an earlier paper From the point of view of the state equations these results constitute submodels representing grinding classification transport and power draw which are

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### a mill power equation for sag mills

the correct power required to grind ore in a SAG mill by developing ore hardness variability functions for the ore body to be mined This paper describes the next step in the SAG design process which is choosing a SAG mill to accomplish the required specified design performance

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### a mill power equation for sag mills

other methods The ball mill correction factor CFnet is empirical and one way of estimating it was presented by Amelunxen at the Procemin 2013 Short Course by Doll Amelunxen The SGI equation uses a transfer size between a SAG and ball mill it is proposed that a synthetic transfer size of 2100 µm be used to model singlestage SAG mills 59ˇ

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### a mill power equation for sag mills

The same underlying model is used for SAG and ball milling with minor differences for the way the charge density is calculated and whether the mill is a grate discharge most of the SAG mills or overflow discharge typically a ball mill

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### a mill power equation for sag mills

Austin considered the mill power as the sum of the power required by the central cylindrical portion and that required by the two end cones The mill power for either AG or SAG mill can be computed from the equation 99 P M K D 25 L ϕ C 1 − 01 2 9 − 10 ϕ ρ C J C 1 − A J C 1 F where K a constant

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### a mill power equation for sag mills

The power numbers that Barratt published are based on mills with typical coneends probably 15° to 25° A flatended shellsupported mill is expected to have 5 less power draw Model Form Lovedays equation is Where P is the power evolved at the mill shell kW P N is the empirical power number read from the chart below

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### a mill power equation for sag mills

The optimal ball diameter in a mill calculation of grinding media in ball mill grinding quartz and copper ore in a laboratory ball mill there has been defined of the equation for determining the optimal ball diameter depending on the grain Kinetics of grinding ceramic bulk considering grinding media contact pointsDOERINGSelection of

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### a mill power equation for sag mills

Optimization and Control of a Primary SAG Mill Using Realtime Grind Measurement CW Steyn K Keet W Breytenbach passing 75 µm With this strategy the controller was able to move the mill power and load into the region that employs a φ73 m x 82 m EGL SAG mills with 2 x 5200 kW motors in primary milling duty

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### a mill power equation for sag mills

AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION A G Doll Logan Lake Canada ABSTRACT This paper expands the SAG mill survey database published by the Author at Procemin 2013 The new database includes 49 published SAGAG mill surveys and includes mills from all over the world

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### a mill power equation for sag mills

As part of the development of a general simulation model for semiautogenous SAG mills it was found necessary to have mill power equations for the large DL pancake type of SAG mill popular in

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### a mill power equation for sag mills

The feed size for these mills is limited to the maximum size that can be practically conveyed and introduced into the large mill feed chutes And the product of the large AGSAG grinding is either a finished size ready of processing or an immediate size for further grinding in a ball mill pebble mill VERTIMILL or a stirred media detritor

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### a mill power equation for sag mills

SAG and ball mills are generally accepted as the largest power consumers in a mining and mineral processing operation and can be 80 of total electrical energy consumed at a specific power consumption of around 20kWhton

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### a mill power equation for sag mills

A model of mill power as affected by mill speed saimm worked examples involving bonds equation in grinding millsJun 6 1993 grinding mills become more sophisticated the need for accurate work done in this area Rose and affect the nature of the dependence of P on N for example a Bonds model as given by equation 1 involving theWhy

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### a mill power equation for sag mills

zFrom the distribution of the points around the line of comparison the good agreement of the results received is obvious 0 200 400 600 Ball mill power draw predicted from the Denver slide rule kW 0 200 400 600 Calculated ballmill power draw from the m odel derived kW Data compared Line yx Fig

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### a mill power equation for sag mills

SAG mills • Determination of your SAG mills 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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