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A linkedin group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data. (2) Using SAG Power Index (SPI) data. (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015)
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Larger than Ball mills at same power draw . Special Tumbling Mill Special tumbling mills [image: (135-6-14)] Conical Ball Mill. Wet or dry (air swept) Overflow or partial grate; ... in order to arrive the gross mill power. For all AG or SAG installations, batch lab tests are mandatory to determine whether this type of grinding is possible at ...
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1. Introduction. SAG (semi-autogenous grinding mills) are large cylindrical chambers with conical ends, that are partially filled with rock and steel grinding media, and which rotate about their central axis at typically 75–82% of the critical speed required to centrifuge the charge.
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LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...
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Formulas given for mill power draw modelling are empirical, and fit around field data over the normal operating range of about 30 to 45% charge level. Theoretically, power draw maximizes at 50% charge level, and actually returns to zero at charge level as the mill becomes a flywheel.
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SAG/Ball Mill Sizing. Gross Power Draw and Specific Energy Calculator for Semi-Autogenous Grinding (SAG) and Ball Mills. Return to Mill Calculators.
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PFC3D can simulate the grinding media motion in the ball mill and calculate the power draw ... M., Morrison, R., 2006a. Prediction of slurry transport in SAG mills using SPH fluid fl ow in a ...
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circuit power requirements for autogenous and semiautogenous milling. The method is widely used by RIVS in extended calcula-tions at early design stages. The article is …
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Prediction of correct sag mill power consumption with a change in ore hardness, solid percent (density) to the sag feed, rpm of sag and PSD has always been very tricky. So far, I have used Austin-Morrell model and Hogg- Fuerstenau power model, but these models seem to work well only under certain boundary conditions.
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The motion of charge inside tumbling mills affects their power draw, liner wear, and material breakage and transport properties. It is therefore important to develop more accurate and fundamental models to describe charge dynamics inside tumbling mills if one is to improve their effectiveness and efficiency in the comminution process.
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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., A mill power equation for SAG mills, …
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AG/SAG mill specific energy calculator ... It is therefore surprising that in all this time there have been no published models for predicting grinding mill power draw which have been validated ...
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Methods to Estimate AG/SAG Mill Power Requirements. A linkedin group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power …
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The Bond model and Morrell E-model are employed as valid empirical models for predicting the power draw of ball mills and AG/SAG mills in industry, respectively. ... It should be noted that we used MAD of 24.62 regarding BSD 1 to calculate the dynamic voidage through Equation 19. Figure 11 illustrates the predicted mills' power draw …
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A case study of evaluating the variance of semi-autogenous (SAG) power draw in a grinding circuit is presented as well. Using Monte Carlo simulation showed that the mean power draw of the Sarcheshmeh SAG mill is …
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Factors A, B, C and L are used to calculate the power drawn by a SAG mill chamber as shown below in equation (2) (from Rexnord 1975): kW = A x B x C x L x …
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The model development relating the charge shape and power consumption to the operating parameters of SAG mills and their usage in deciding on the mill operating strategies to calculate the wear of ...
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The Mill Filling Inference Tool which has been implemented at several mine sites, compares SAG mill load cell and power draw measurements with outputs of a semi-mechanistic power model to estimate ...
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The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size distribution. However, these models are solved under steady approximation and do not provide any information on mill charge distribution in …
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These equations are expanded to calculate the mass of the SAG mill contents and the proportion of steel media, ore, and water. 2. ... Power draw of grinding mills – Its measurement and prediction. In: 5th Mill operator's conference. Roxby Downs 16-20 October, 1994. Google Scholar. Mosher and Alexander, 2002. Mosher, J., …
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SAG mill liner change-out life/cycle vs. tons/kg consumed. Ball mill liner efficiency based on liner geometry and its influence on kW-hours/ton, total tons/life cycle, and P80 transfer to cyclones. Ball mill grind is based on different principle; it has some attributes similar to SAG mill optimization. SAG mill breaks with stirring the kidney ...
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Thus the power to drive the whole mill. = 49.5 + 66.0 = 115.5 h.p. = 86 kW. From the published data, the measured power to the motor terminals is 103 kW, and so the power demand of 86 kW by the mill leads to a combined efficiency of motor and transmission of 83%, which is reasonable.
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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.
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The article discusses the topic of the specific power consumption of a drum mill type SAG 8.5x5.3. The purpose of the study is to<br> determine the influence of some basic parameters like angular velocity of the mill drum, the wear on the drum's lining, mass of the mill filling, loading rate of the mill with ore and flow rate of incoming water of the …
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where m p is in kW; D is internal mill diameter (meters), L is internal mill length (meters); J is total fractional charge loading of the mill; J B is the fractional mill filling by balls; ε B is the effective porosity of the charge, taken as 0.3; ρ s and ρ b are true densities of rock and balls (tons per cubic meter), respectively; w c is ...
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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 …
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the mill shell. The measured power is 3,190 kW at mill shell, so the model predicts high by 298 kW, or 9%. However, by substituting the recommended 5% allowance for a cone end instead of Austin's cone allowance results in a 148 kW of power generated in the cone, for a total of 3,113 kW power draw at the mill shell. The measured power is 3,190 ...
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In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing the power consumed (kW) by the fresh feed rate (t/h).
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A SAG mill operates with a 10,000 hp motor. Typical power draw is 80% of maximum. The 80 percent passing feed size to the mill is 6 inches and the mill discharge has an 80 percent passing size of 2.3 mm. Calculate the Operating Work Index for this mill if the feed tonnage rate is 1175 tonnes per hour. 2. A SAG mill operates with a 10,000 hp motor.
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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 …
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A nice and pretty online Ball Mill Power-draw Calculator was put live by one of the great prophets of grinding. ... The user interface offers Metric OR Imperial measurements for sizing SAG/AG and Ball Mills of overflow or grate type discharges. by David Michaud February 29, 2024 August 24, 2015 Categories Tools of a Metallurgist.
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Data were collected from a wide range of wet industrial grinding mills to calibrate and verify the model. In total 76 data sets were generated covering the power draws of ball, SAG and AG mills in ...
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The chord produced by spacing equal to two times mill diameter (ft.) or 470 mm (18.8 in.) is desirable. Shell liners so designed can minimize charge "packing" problems and still provide sufficient lifts for normal mill action to lift the charge and hence draw power and do work (comminution). Mill end plate bolt spacing.
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predictions made by two published mill power draw models for SAG mills (Austin's SAG model and Morrell's C-model). 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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The purpose of a grinding mill is to convert electrical energy into rock breakage. The best use of that asset is to try to maximize the power draw. Try to hold the mill speed high and vary the feed rate to hold the weight (or bearing pressure), but watch out for "cycling" or "surging" that indicates instability in the charge.
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bling mills (AG/SAG, rod, and ball mills) involved in reducing the size of the primary crusher product to that of the final product (usually the cyclone overflow of the last stage of grinding prior to flotation/leach-ing). 2. Feed rate to the circuit (dry tonnes/h) 3. Power draw of the comminution equipment (kW)
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