# calculating power draw when sizing ball mills ###### Modeling of power consumption of ball mill | Request PDF

Two approaches for calculating power draw were considered: the torque of the centre of mass about the mill centre, and the time averaged torque contribution per discrete grid cell summed over the . ###### Converting a ball mill from overflow to grate discharge ,

Jun 23, 2020· Estimates of the increases in power draw possible with grate discharge ball mills range from 10% to 20%, according to mill size and other operating parameters The figures from pilot tests and some operating sites are even higher, up to 25% more power draw ###### Calculating Ball Mill Throughput - Henan Mining Machinery , ###### Ball Mill Parameter Selection & Calculation - Power ,

Aug 30, 2019· 1 Calculation of ball mill capacity The production capacity of the ball mill is determined by the amount of material required to be ground, and it must have a certain margin when designing and selecting There are many factors affecting the production capacity of the ball mill, in addition to the nature of the material (grain size, hardness, density, temperature and humidity), the degree of . ###### Ball Mill Calculation Kw And Rpm - Stone Crushing Machine

CALCULATION OF THE POWER DRAW OF DRY MULTI–COMPARTMENT BALL MILLS calculate the power that each ball mill compartment should draw ,Mill Power 1450 – 5200 kW r m L i r i r t L dCalculation of the power draw of dry multi-compartment ball , Click & Chat Now ###### 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 ###### ball mill power draw calculation - Pochiraju Industries Ltd

o SAG-ball mill circuit (full example provided, this draft) o HPGr-ball mill circuit , Obtain the power draw of the size reduction equipment at the drive pinion(s) , Calculate W, the work/energy input, from the size reduction equipment power (kW) Get Price ###### calculate sag mill power draw - supervisie-mariankramersnl

Calculating Power Draw when sizing Ball Mills The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to - determine the specific energy of an industrial SAG mill The test is operated in closed circuit and the time required to , ###### EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL ,

Figure 511 Power variation with mill speed for different media shapes (J=15%)86 Figure 512 Power variation with mill speed for different media shapes (J=20%)87 Figure 513 Power variation with mill speed for different media shapes (J=25%)87 Figure 514 Variation of mill power draw with mill filling, J (cylpebs media),88 ###### Optimization of mill performance by using

The performance of tumbling mills is sensitive to the volumetric mill filling which influences grinding media wear rates, throughput, power draw, and product grind size from the circuit Each of these performance parameters peaks at different filling valu In order to contin-uously optimize mill operation, it , ###### Ball Mill Charge Volume Calculation Pdf

Ball Mill Charge Volume Calculation Pdf Calculation of the power draw of dry multicompartment 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 ###### Ball mill media optimization - Metcom Tech

Media sizing Ball mill media optimization through functional performance modeling , mill test, the calculation method of the mill , the value of E is the specific energy input to the solid material as it passes through the plant mill (the mill power draw divided by the mill solids throughput rate), and assumes plug flow and equal residence . ###### ball mill model - SAGMILLINGCOM

This ball mill and rod mill power draw model is based on a torque model and empirical measurements made by the Equipment Company for use by its sales representatives to size grinding mills Slight differences in the equations used allow rod mills, dry ball mills and wet overflow and grate ball mills to be sized ###### Predicting charge motion, power draw, segregation and wear ,

Particle fows in a S m diameter ball mill are presented The charge behaviour, torque and power draw are analysed for a range of rotation rates from SO to 130% of the critical speed Sensitivity of the results to the choice of friction and restitution coefficients and to the particle size distribution are examined ###### 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 813 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 83 Ad this can be used to establish the essential . ###### Modelling: Transfer size limits - SAGMILLINGCOM

For example, the SAG mill may have 10 MW of power draw available and the two ball mills each of 75 MW of power draw available for a total of ratio of 10:15 (1:15) The software uses the particular power model (Bond/Barratt, Morrell Mi, etc) to determine what is the transfer size where the ratio of E SAG to E ball matches the ratio of mill . ###### AG/SAG/Ball Mill Sizing

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: ###### The effect of ball size distribution on power draw, charge ,

at a constant mill filling, the power draw was changed with changing the ball size distribution and for all mill fillings the maximum power draw occurred when the fraction of small balls was between 30-40% The effect of ball size distribution increased with increasing mill filling and for the mill filling of 35%, the ball size distribution had . ###### Calculation of the power draw of dry multi-compartment ,

In this paper, a new approach for the calculation of the power draw of cement grinding ball mills is proposed For this purpose, cement grinding circuit data including the operational and design . ###### Ball Mill Charge Calculation - caesarmachinery

ball mill charge calculation Calculate Ball Charge For Dry Ball Mill calculate cement mill ball charge Dry ball mills are effective grinding systems in the general , - Ball charges: This calculator gives the surface and the average weight of the ball charg It gives also a rough interpretation of the ball charge efficiency: ###### Design, Construction and Performance Analysis of a 5 ,

laboratory ball mill This method is based on two power calculation approaches used in ball and rod mill design processes due to its simplicity and workability The first approach, which is specific power calculation, determines the power required to grind an ore from a given feed size to a specific product size The second approach, the shaft . ###### 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 ###### power calculation formula of ball mill

Ball Mill Design/Power Calculation Apr 08, 2018 Ball Mill Power Calculation Example #1 A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns) The required product size distribution is to be , More ###### 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 . ###### MODELING THE SPECIFIC GRINDING ENERGY AND BALL ,

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 ###### Ball Mill Design/Power Calculation

Jun 19, 2015· Example Calculation A motor with around 1400 Horse Power is calculated needed for the designed task Now we much select a Ball Mill that will draw this power 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 , ###### Charge behaviour and power consumption in ball mills ,

Aug 01, 2001· Fig 1 shows typical charge shapes predicted for our ‘standard’ 5 m ball mill and charge (described above) filled to 40% (by volume) for four rotation rates that span the typical range of operational speeds For such a charge with a realistic size range, the free surface of the charge is well defined at low and intermediate rotation rat For N=60%, material moves with the mill rotation . ###### 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 ###### ball?mill?power?consumption?formula | worldcrushers

Apr 19, 2013· Ball Size Eqn ball mill ball size calculations wheel turning torque calculation , Calculation of power consumption for ball mills and grinding media charges , ###### Ball Mill Design/Power Calculation - LinkedIn

Dec 12, 2016· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size ,