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Ball mill power draw predicted from the Denver slide rule kW 0 200 400 600 Calculated ball mill power draw from the m odel derived kW Data compared Line y=x Fig 2 Comparison of the ball mill power draw from the Denver slide rule and the proposed model Dashed line corresponds to y=x.

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Two types of ball motion cascading and cataracting were taken into account For the first type of motion Morrell s power model approach Morrell S 1996 Power draw of wet tumbling mills and its relationship to charge dynamics Part 1 A continuum approach to mathematical modelling of mill power draw Trans I.M.M 105 C43–C53 was

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A power analyser was utilized to measure mill power Increase in mill speed and ball filling leads to a remarkable increase in the amount of the power Preliminary results show that there is a definite trend between the power and the slurry filling U Mill power draw is maximum at slurry concentration 60–70 and slurry filling 0.84.

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Get Price### The Evolution of Grinding Mill Power Models SpringerLink

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 Hogg Fuerstenau Power Model and show how this model successfully predicted the power draw of many grinding mills in several mining operations Then we show how this model was on the verge of being able to predict the

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The Bond equation can predict the specific energy with acceptable accuracy for ball and rod mills but as pointed out by Morrell 2004 this law tends to either over predict or underpredict the

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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 features of a model for mill power.

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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

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The Bond equation can predict the specific energy with acceptable accuracy for ball and rod mills but as pointed out by Morrell 2004 this law tends to either over predict or underpredict the

Get Price### Modelling the influence on power draw of the slurry phase

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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Get Price### Modelling the influence on power draw of the slurry phase

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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An updated data set for sag mill power model calibration This paper expands the SAG mill survey database published by the Author at Procemin 2013 The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world.

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Choosing A SAG Mill To Achieve Design Performance A further explanation is required to explain the importance of designing the sag mill chamber to draw required power at optimum operating conditions of critical speed and less than by volume load recent studies in the threefoot diameter sag mill are instructive the following graph shows the relevant facts as figure

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The model prediction of product size distribution is good and has been found to be strongly dependent of the characteristics of the material being tested The prediction of throughput and corresponding power draw based on throughput is sensitive to inconsistent gap/diameter ratios observed between laboratory scale tests and full scale operations.

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exception is the Morrell s model Morrell 2008 2009 In his approach the total speciﬁc energy of the entire AG/SAG circuit is ﬁrstly predicted using the SAG mill feed F80 and the ball mill cyclone overﬂow P80 Morrell s model Morrell 2011 relates the feed mill geometry and operating conditions to the speciﬁc energy of the

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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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