ball mill power draw pi

TECHNICAL NOTES 8 GRINDING R. P. King

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. 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 ...

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Ball mill media optimization - Metcom Tech

plant mill (the mill power draw divided by the mill solids throughput rate), and assumes plug flow and equal residence time of all particle sizes (see later note). The value of E for the torque mill test is the mill energy input divided by the solids load. The energy specific cumulative grinding rate at each screen size is calculated from a

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Mill power draw models - SAGMILLING.COM

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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USING DISCRETE ELEMENT METHOD TO INVESTIGATE BALL …

The mill power draw also increased with increase in rotational speed at lower percent critical speed; but quickly decreased beyond 70–80% of the critical speed. The highest mill power draw corresponded at 80% critical speed, which is in the speed range that most PGM mills are operated. The decrease in the mill power draw was believed to be ...

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PowerPoint Presentation

Ball mill power draw Ball mill power installed Ball mill specific energy Total specific ener Desi gn through put Design through put ... Comparison of Key operating data for the base case simulation of Iduapriem circuit and PI data PI Data Base case model rate (t/h) 717 720 throughput (Mt) 5.97 SAG Mill 1 SAG Mill 2 Ball Mill 1 Ball Mill 2 Feed ...

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ball mill calculation used in power plants

The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 meters 10 feet diameter inside liners, the top size of the balls used affects the power drawn by the mill. This is called the ball size factor S.  Rod and Ball Mills by C.A. Rowland and D.M. Kjos Allis-Chalmers

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AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill ...

Mill Power Draw. The motor power draw required to turn a mill from rest to the operating speed includes the energy required for the initial starting torque and mechanical arrangements to rotate the mill. It is generally accepted that practical mill power (PM ) is a function of mill capacity and diameter, i.e.,P M = Mill Constant * (Mill ...

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fine and low price ball milland good quality of stone ball ...

Ball Mill Features 1) Ball mill is an efficient tool for grinding many materials into fine powder. 2) The ball mill is used to grind many kinds of mine and other materials or to select the mine. 6) To use the ball mill the material to be ground is loaded into the neoprene barrel that . Get Price; mill ball …

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Ball mill pinion | prmdrive

Sep 22, 2019· Pinion module of ball mill: Module is the ratio of pitch t to PI (m = t/ PI) between the teeth of the same side of two adjacent gears, measured in millimeters. Modulus is one of the most basic parameters in gear manufacturing. The larger the modulus is, the higher the tooth is, the thicker the tooth is. National standard ball mill pinion module ...

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Analysis of Power Draw in Ball Mills by the Discrete ...

Abstract Ball mills, like other comminution devices, consume large amounts of energy. Mill operators often have to assess the power draft of mills for an entirely different set of operating conditions or for a reconfigured circuit. It is shown that the power draft can be accurately predicted from analysis of the motion of the charge. The motion of the charge is rigorously simulated with a ...

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ball mill power draw pi

Further studies of ball and powder filling effects in ball. The specific rates of breakage of quartz have been studied in three tumbling ball mills,, the power draw by the mills with, i11in0 ronqC pI 1 1 1 1 1.

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Cement Grinding Optimization - SlideShare

Jul 31, 2014· Mill power draw prediction can be carried out using Morrell's power model for tumbling mills (Morrell, 1998). Bond method The established technique for determining power requirements for ball mills is the Bond method (Bond, 1961). This method also involves the application of some 'efficiency factors' as described by Rowland (1975).

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formula of charge volume in ball mill

CALCULATION OF THE POWER DRAW OF DRY . Calculation of the power draw of dry multi-compartment ball mills 225 The mill load that is the volume of charge in the mill is the principal determinant of power draw. Estimation of the ball load that is mixed with the cement charge is difficult and can be highly erroneous.

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Using DEM to investigate ball milling power draw, load ...

Nov 02, 2014· 3. Experimental Procedure The DEM simulated mill was configured to match the environment inside the laboratory scale ball mill at Mintek. The DEM parameters used for the simulations are given in Table 3.1. 5. Discussion •Fig. 4.1 shows that the mill power draw increased gradually as the lifter face angle decreased from 90° to 45.

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CHAPTER 1 INTRODUCTION

(SISO) system. The power draw of the mill was controlled by manipulating the feed rate of ore to the mill. The authors found that the design of the controllers were more systematic than for PI control with guarantees on performance and stability. The methodology can also easily be extended to multi-input-multi-output (MIMO). Craig and MacLeod ...

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GROSS POWER CALCULATOR - SMC Testing

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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how to draw ball mil and its size

Ss – Ball size factor To determine the power that a dry grinding needs, full grate discharge mill Equation 1 is multiplied by the factor of 1.08. A multi-compartment ball mill consists of two or more grate discharge ball mills in series. The same equation is used to calculate the power that each ball mill compartment should draw. The total ...

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CALCULATION OF THE POWER DRAW OF DRY …

Calculation of the power draw of dry multi-compartment ball mills 225 The mill load that is the volume of charge in the mill is the principal determinant of power draw. Estimation of the ball load that is mixed with the cement charge is difficult and can be highly erroneous. So direct measurement must be taken for calculation of mill load.

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Ball Mill Motor Power Draw Sizing and Design Formula

Oct 19, 2015· Ball Mill Motor Power Draw Sizing and Design Formula. The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 meters (10 feet) diameter inside liners, the top size of the balls used affects the power drawn by the mill. This is called the ball size factor S.

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The Evolution of Grinding Mill Power Models | SpringerLink

Jan 30, 2019· The first one is the Mines Constancia SAG mill of size 36 × 26.5 ft. The mill is operating at 72% critical speed and 26% mill charge volume. The mill is fitted with trapezoid-shaped high and low lifters. The operating power draw was reported to as between 13.7 and 15.7 MW.

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Ball Mill Research Papers - Academia.edu

Effects of slurry filling and mill speed on the net power draw of a tumbling ball mill ABSTRACT The pool of slurry is known to lower the power drawn to the mill. An attempt to ascertain this observation by relating load orientation to mill power for a range of speeds and …

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(PDF) Design of the biggest mill in the world

Ball Mill Power From analysis of the pilot plant data, it was determined that the lo west SAG mill p ow er draw would be 7.0kWh/t when using a 12% ba ll load and low rock

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Predicting charge motion, power draw, segregation and …

Nov 01, 1998· The average power is 3 105 W per meter of mill length. This gives a total power draw for a typical 7 m mill of 2.1 MW. This compares well with a typical lrnotor power of 3.3MW. Superimposed on this average power draw are irregular high frequency fluctuations of 130% of the mean, reflecting the highly impulsive and unsteady flow of the charge.

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Optimizing Performance of SABC Comminution Circuit of the ...

Dec 02, 2016· 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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Construction of Ball Mill/ Ball Mill Structure | Henan ...

Jan 14, 2019· Over 10 years the magnetic metal liner has been used in more than 300 full-scale ball mills at over 100 mine sites in China. For example, one set of the magnetic metal liner was installed in a 3.2m (D) x 4.5 m (L) secondary ball mill (60mm ball charge) at Waitoushan concentrator of Benxi Iron and Steel Corp. in 1992.

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Ball Mill Design/Power Calculation

Jun 19, 2015· The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The following shows how the size or select the matching mill required to draw this power …

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MODULE #5: FUNCTIONAL PERFOMANCE OF BALL MILLING

• Effective mill power draw • Ball mill specific grinding rate • Ball mill grinding efficiency The circuit output is defined as the production rate of fines by the circuit. It is calculated from three values: 1. The dry ore feed rate to the circuit (t/h). 2. The % fines in the circuit feed. 3. The % fines in the circuit product.

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ball grinding parameters

Ball Mill Parameter Selection Calculation Power . Forged steel balls; P=s=4548t/m3 cast steel balls P=4346t/m3; rolling steel balls P=6068t/m3; steel segments P=4346t/m3filling ratio of grinding medium, When wet grinding: lattice ball mill pi = 40% – 45%; overflow ball mill phi = 40%; rod mill phi = 35% Dry grinding: When material is mixed between grinding media, the grinding medium expands ...

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The effect of ball size distribution on power draw, charge ...

2014). However, the horizontal planetary ball mill is different than the tumbling ball mill in many aspects. Djordjevic (2005) studied the influence of ball charge size distribution on the net-power draw of tumbling mill based on DEM modeling. Charge of the mill was composed from the spherical balls

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Modelling SAG milling power and specific energy ...

Usually, tumbling mills power equations have been derivate from mechanics as the product of torque and rotational speed. Models for the prediction of the power drawn by ball, semi-autog-enous and fully autogenous mills have been developed and cited in the technical literature (Turner, 1982; Austin, 1990; Moys, 1993; Morrell, 1996).

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Energy Benchmarking - SMC Testing

SAG mill power draw: 19875 kW. Ball mill power draw: 17980 kW. Pebble crusher power draw: 650 kW. Pebble crusher no-load power: 120 kW. Checks were made to ensure that the throughput data were in terms of dry tonnes/hr. Dry tonne/hr are obtained from raw weightometer readings less a moisture content allowance. Power draw data were also checked ...

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Analysis of power draw in ball mills by the discrete ...

Apr 01, 1999· The ball load, at which the mill draws maximum power, is about 53%. The simulation results of 0.762-m mill running at 60% critical speed are plotted in Fig. 4. The relevant operating and simulation parameters are listed in Table 3. The calculated power draft is maximum at about 50% ball …

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