### Grinding Mill Computer Model

Approximate mill diameter is derived from Power =5 6115 DL24 6 La= D where a is the aspect ratio L/D derived from a regression equation on 25 manufacturers mill size and power relationships For SAG mills the equation becomes Power= 5.6115 balls 0.1438 D24 6 L Mill Critical speed Crit Crit D = 42.3 nrevs per min nC= s Crit Cs is

Get Price### Modelling SAG milling power and specific energy

the mill power and the efﬁciency of the mill operation Van Nierop and Moys 2001 If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not con sider the projected feed size distribution it is likely that this mill will reach the expected power

Get Price### Face Milling Calculators Force Torque and Power

z c Number of inserts in the cut a e /d 1 Ratio of radial width of cut to cutting diameter Calculated Required Power F t Tangential cutting force lb N T Torque at the cutter Nm in lb ft lb Nmm Machining Power P s at the cutter HPc KW P m at the motor hp KW These calculations are based upon theoretical values and are only intended

Get Price### 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.

Get Price### A Method of C alculating Autogenous Semi Autogenous

SAG mills mimic the same shortcoming It follows that in order to obtain the speciﬁ c energy SE to achieve a certain transfer size based on the 80 per cent passing value an inefﬁ ciency factor must be applied to the SE of single stage ball mills rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method.

Get Price### Modelling SAG milling power and specific energy

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

Get Price### SAG mills selection methods III The F Bond index

Mar 10 2020 Calculations are made for 20 30 pieces generally The piece sizes are included in the previously indicated range where nis the number of test samples not less than 20 pcs The formula for calculating the CWi index for each single piece of material is as follows where k is a constant coefficient ≈97.4 depends on the installation

Get Price### MODELING THE SPECIFIC GRINDING ENERGY AND BALL MILL

21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ball mill power drawP as a function of its dimensions internal mill diameter D and length L zthe ball mill power drawP as a function of the feed D f mm and the product size d mm the Bond work index w i kWh/short ton and the mill throughput T short ton/h zthe ball mill dimensions D and L when

Get Price### Estimated Water Requirements for the Conventional

The crushed ore is transferred to a semiautogenous SAG mill or ball mill where the ore is further reduced in size Water is added to the ball mill in which a slurry that usually contains from about 20 to 55 percent solids is produced Singh 2010 International Mining 2011 see fig 2 The

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The wind power formula is given as P = 38622 W Example 2 A wind turbine travels with the speed is 10 m/s and has a blade length of 20 m Determine wind power Solution Given Wind speed v =10 m/s Blade length l = 20 m air density ρ = 1.23 kg/m 3 area

Get Price### Cutting Power for Face Milling MITSUBISHI MATERIALS

What is the cutting power required for milling tool steel at a cutting speed of 80m/min With depth of cut 2mm cutting width 80mm and table feed 280mm/min by Φ250 cutter with 12 inserts Machine coefficient 80 Answer First calculate the spindle speed in order to obtain feed per tooth n=1000vc÷πDC= 1000 80 ÷ 3.14 250 =101.91min 1

Get Price### O I SKARIN N O TIKHONOV CALCULATION OF THE

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 composed of sections successively informing on the existing techniques of sizing SAG mill power Bond work in dexes and their applicability to calculating autogenous/semiau

Get Price### Formula For Recirculating Load Of Cyclones And Mill

Power Calculation Formula Of Sag Mill 65 circulating load in roll mill how to caluclate recirculating lod of ball mill mines WHY DO WE NEED SUCH A HIGH RECIRCULATING LOAD ON OUR BALL MILL formula to calculate number of cyclones for a rod mill/ball mill.

Get Price### Sample Calculation of Sag and Tension of Transmission Line

Jan 13 2018 This is an example calculation for sag and tension in the transmission line You may opt to review first the fundamental principles and formulas from this post. The foregoing calculation is based on the linear cable model on which plastic elongations are ignored Also the loading of the conductors is based on the National Electrical Safety Code 2017.

Get Price### A New Approach to the Calculation of Work Index and the

The mill dimensions D L are 0.204 0.158 m and it is loaded with 6.5 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM 1.667 Hertz corresponding to 85 of the critical frequency The mill power is P = 16.2 Watts calculated by the formula provided by Stamboltzis 7 PMN

Get Price### Grinding Mill Computer Model

Approximate mill diameter is derived from Power =5 6115 DL24 6 La= D where a is the aspect ratio L/D derived from a regression equation on 25 manufacturers mill size and power relationships For SAG mills the equation becomes Power= 5.6115 balls 0.1438 D24 6 L Mill Critical speed Crit Crit D = 42.3 nrevs per min nC= s Crit Cs is

Get Price### Bond Grinding Circuit Efficiency

Example SAG Ball Mill Circuit WI Efficiency Calculation SAG ball circuit F80 = 165 000 um P80 = 125 um W = 14.6 kWh/t Wlo = 14.6 10 SQRT 125 10 SQRT 165 000 = 16.8 kWh/t Bond Test WI s kWh/t Crushing 16.0 Rod Mill 14.5 Ball Mill 13.8

Get Price### AGAutogenous SAG Semi Autogenous Mill Design Calculations

Apr 17 2018 Obviously the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method but the overall total is 99.5 of the predicted total Examples The Hemlo gold project of Teck Corona 1000 mtpd provides an example of mill sizing using the empirical calculation

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Removal of all visible rust mill scale paint and foreign matter using power tools and producing a minimum profile of 1 mil Complete removal of rust and mill scale by acid pickling duplex pickling or electrolytic pickling Blast cleaning of all except tightly adhered residues of mill scale rust and coatings.

Get Price### Power based comminution calculations using Ausgrind

power requirements for circuits including SAG and ball mills The method required a proposed F 80 feed size to the SAG mill the final grind size and an estimate of the transfer size between the

Get Price### Application of Operating Work Indices in Autogenous

terms such as SAG mill inefficiency factor As ore breakage characteristics can be a major factor in AG/SAG mill product size distribution Figure 2 compares only data for porphyry ores Before the true power efficiency of an AG/SAG grinding mill can be properly assessed by using the Wio concept the T 80 used for calculations must be

Get Price### power calculation formula of sag mill

sag mill power calculations Ball Mill Design/Power Calculation The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing arematerial to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80

Get Price### Modelling SAG milling power and specific energy

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

Get Price### Operation Analysis of a SAG Mill under Different

Oct 09 2020 the ﬁll level ratio and the steel ball ratio on the SAG mill Finally through statistics and analysis of particle information and mill power under di erent conditions we analyzed the inﬂuence of three parameters on the particle fracture e ect in the SAG mill and obtained the best operating parameters of the SAG mill 2.

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Power and Control Cables used on Take up Reels and Sheaves 42 TABLE 79 Galvanized Steel WireTensile StrengthWeightDiameters 46 TABLE 710 Sag Messenger Characteristics 47 TABLE 711 Sag Tables 49 TABLE 712 Sag Calculating Charts 50 TABLE 713 Sag Calculating Charts 51 SECTION 8 High Voltage Proof Testing

Get Price### BALL ACME LEAD SCREW TECHNICAL INFORMATION I

Helpful Formulas When determining the amount of input torque required to produce an amount of output linear force there are many factors to consider The following equations provide a practical approach in making force and torque calculations Force Calculations F T = F A F E F F 1 where F T = Total Force F A = Acceleration Force F E

Get Price### Step by Step Sag and Tension Computation using Ruling Span

Jul 29 2018 Clearances must be based on the final computed sag of the power line Take note that if we will not use the ruling span theory the final sag would be different For instance if we apply directly the conductor state change equation to the 500 meters span S =500 the final tension would be H 2 = 16 265 Newtons with a sag of 23.35 meters.

Get Price### 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

Get Price### 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

Get Price### AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

SAG Mill Circuit Example Gold Processing SAG mill circuit example for gold processing image 135 6 3 AG/SAG Mill AG/SAG mills are normally used to grind run off mine ore or primary crusher product Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids 2D and 3D simulations of particles in a SAG Mill

Get Price### A New Approach to the Calculation of Work Index and the

The mill dimensions D L are 0.204 0.158 m and it is loaded with 6.5 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM 1.667 Hertz corresponding to 85 of the critical frequency The mill power is P = 16.2 Watts calculated by the formula provided by Stamboltzis 7 PMN

Get Price### How to Calculate and Solve for Shaft Power Ball Mill

Jul 17 2021 To compute for shaft power ball mill length six essential parameters are needed and these parameters are Value of C Volume Load Percentage J Critical Speed V cr Bulk Density s.g Mill Length L and Mill Internal Diameter D The formula for calculating shaft power ball mill length P = 7.33 x C X J X V cr x 10.937 x 1

Get Price### Modelling SAG milling power and specific energy

the mill power and the efﬁciency of the mill operation Van Nierop and Moys 2001 If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not con sider the projected feed size distribution it is likely that this mill will reach the expected power

Get Price### Sag calculation in overhead line Electricalunits

The sag in overhead line is a length in between support point of conductor and the lowest point on the conductor of transmission and distribution overhead line Calculation of Sag The sag tension of conductor may be calculated in the following condition a When the supports are at equal levels b When the supports are at unequal levels.

Get Price### A mill power equation for SAG mills SpringerLink

Feb 01 1990 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 the weight fraction of rock in water and rock in

Get Price### O I SKARIN N O TIKHONOV CALCULATION OF THE

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 composed of sections successively informing on the existing techniques of sizing SAG mill power Bond work in dexes and their applicability to calculating autogenous/semiau

Get Price### Sag in a Transmission Line What is it And How To

Feb 24 2012 The formula to calculate sag changes based on whether the support levels i.e the transmission towers holding up the overhead conductor are at the same level Sag calculation for supports are at equal levels Suppose AOB is the conductor A and B are points of supports Point O is the lowest point and the midpoint Let L = length of the span

Get Price### Milling Formula CalculatorCarbide Depot

Milling Formula Interactive Calculator Solve for any subject variable in bold by entering values in the boxes on the left side of the equation and clicking the Calculate button The solution will appear in the box on the right side of the equation To enter a value click

Get Price### Flicker Analysis and Case Studies

Aug 05 2008 Reactive power draw increases substantially due to extreme speed reduction Significant voltage reduction due to reactive power draw Event #1150 hp head saw abruptly loaded updata collected at utility metering point Case #1Head Saw Load Up9.6 Vdrop Mill Secondary and 6.6 Vdrop On Primary

Get Price### UTILITY LINE DESIGN CALCULATIONS

Utility Line Design has over twenty five planned calculations that will be added to the website at no added charge in the coming months Standards and Design Criteria SURVEYING Measuring Angles by Tape Measure Method Measuring Small Angles from Adjacent Pole by Tape Measure Method Deflection Angle from Two Traverse Bearings.

Get Price### Ball Mill Design/Power Calculation

Dec 12 2016 If P is less than 80 passing 70 microns power consumption will be Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is

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