### A mill power equation for SAG mills SpringerLink

1990-2-1 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 ...

More### Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

2014-10-1 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 grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using Equation

More### Modelling SAG milling power and specific energy ...

2015-1-1 The main objective of this work is the development of mathematical models able to be used as predictive tools to optimise power consumption and/or specific energy in actual SAG mills, assuming that the ore competence was already included in the basic design of the mills (for example using DW i in the specific energy equation (Morrell, 2004 ...

More### SAG Mill Grinding Circuit Design - 911metallurgist

2016-6-6 Traditionally, many engineers approached SAG circuit design as a division of the total power between the SAG circuit and ball-mill circuit, often at

More### TECHNICAL NOTES 8 GRINDING R. P. King

2009-7-30 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 ...

More### 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

More### Ball Mill Design/Power Calculation

2015-6-19 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

More### Ball Mill Design/Power Calculation

2016-12-12 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

More### DETERMINATION OF POWER CONSUMPTION IN MILLING

2013-11-20 total mechanical power is reduced into a new, simple relation: P =F x⋅vx +F y ⋅vy +M z ⋅ωz (5) This is the formula to obtain the power consumption in the center of the dynamometer with the forces and moments provided by dynamometer. But to be closer to reality, one has to obtain this power at the tip of the tooth. For this it is

More### Wind Turbine Blade Efficiency and Power Calculation

2021-6-4 the following vital equation: Power = 0.5 x Swept Area x Air Density x Velocity3, where Power is given in Watts (i.e. joules/second), the Swept area in square metres, the Air density in kilograms per cubic metre, and the Velocity in metres per second. The equation for wind power(P) is given by P= 0.5 x ρ x A x Cp x V

More### 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.

More### TECHNICAL NOTES 8 GRINDING R. P. King

2009-7-30 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 ...

More### 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

More### Autogenous and Semi-Autogenous Mills - ScienceDirect

2016-1-1 Austin considered the mill power as the sum of the power required by the central cylindrical portion and that required by the two end cones. The mill power for either AG or SAG mill can be computed from the equation (9.9) P M = K D 2.5 L ϕ C 1 − 0.1 2 9 − 10 ϕ ρ C J C (1 − A J C) (1 + F) where K = a constant

More### DETERMINATION OF POWER CONSUMPTION IN MILLING

2013-11-20 total mechanical power is reduced into a new, simple relation: P =F x⋅vx +F y ⋅vy +M z ⋅ωz (5) This is the formula to obtain the power consumption in the center of the dynamometer with the forces and moments provided by dynamometer. But to be closer to reality, one has to obtain this power at the tip of the tooth. For this it is

More### Overhead Line Sag Tension with Calculation and Example ...

Overhead Line Sag Tension with Calculation and Example. When estimating sag in a transmission line, there are two conditions: When all of the supports are at the same level. When support levels are not at the same level. The formula for calculating sag changes depending on whether the support levels (i.e., the transmission towers holding up the ...

More### How to Calculate Grinding Mill Operating Efficiency

2017-9-13 The equation for operating work index as given in the paper “Tools of Power Power” (6) is. Wio = W/10/p0.5 – 10/F0.5. Where: Wio = Operating Work Index as kwh per either short ton or metric tonne. W = Measured power in kwh

More### Voltage Sag Assessment by using Voltage Drop Equation

2012-2-3 Keywords: Critical buses, Power quality, Stochastic assessment, Voltage drop equation, Voltage sags 1. Introduction Voltage sag is a troublesome problem related to power quality. The general causes of voltage sags are power system faults, overloads and large motors starting [1]. Voltage sag is defined as a short duration (duration from 0.5

More### Wind Turbine Blade Efficiency and Power Calculation

2021-6-4 the following vital equation: Power = 0.5 x Swept Area x Air Density x Velocity3, where Power is given in Watts (i.e. joules/second), the Swept area in square metres, the Air density in kilograms per cubic metre, and the Velocity in metres per second. The equation for wind power(P) is given by P= 0.5 x ρ x A x Cp x V

More### Milling Horsepower Calculator - CustomPart.Net

Milling Horsepower Calculator. Calculate the horsepower required for a milling operation based on the feed rate and depth of cut, which are used to determine the material removal rate (or metal removal rate). Also required is the unit power, which is a material property describing the amount of power required to cut that material.

More### Calculation of Sag Tension in Transmission Line - for ...

Calculation of sag and tension in transmission line depend on the span of the conductor. Span having equal level supports is called level span, whereas when the level of the supports is not at an equal level is known as unequal level span.

More### Morrell C-model - SAGMILLING.COM

2020-3-22 Morrell C-model. Applies to both SAG and ball mills, with variants for grate-discharge and overflow mills. This model was developed as part of the PhD thesis of Stephen Morrell at the University of Queensland and is the model used in the

More### Overhead Line Sag Tension with Calculation and Example ...

Overhead Line Sag Tension with Calculation and Example. When estimating sag in a transmission line, there are two conditions: When all of the supports are at the same level. When support levels are not at the same level. The formula for calculating sag changes depending on whether the support levels (i.e., the transmission towers holding up the ...

More### SAGMILLING.COM .:. Articles

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

More### Voltage Sag Assessment by using Voltage Drop Equation

2012-2-3 Keywords: Critical buses, Power quality, Stochastic assessment, Voltage drop equation, Voltage sags 1. Introduction Voltage sag is a troublesome problem related to power quality. The general causes of voltage sags are power system faults, overloads and large motors starting [1]. Voltage sag is defined as a short duration (duration from 0.5

More### 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

More### Milling Horsepower Calculator - CustomPart.Net

Milling Horsepower Calculator. Calculate the horsepower required for a milling operation based on the feed rate and depth of cut, which are used to determine the material removal rate (or metal removal rate). Also required is the unit power, which is a material property describing the amount of power required to cut that material.

More### Wind Energy Math Calculations - Competitively-Priced

2016-6-17 Wind Energy Math Calculations Calculating the Tip Speed Ratio of Your Wind Turbine The Tip Speed Ratio (TSR) is an extremely important factor in wind turbine design. TSR refers to the ratio between the wind speed and the speed of the tips of the wind turbine blades. Fast TSR (λ) = If the rotor of the wind turbine spins too

More### Motor Calculations - University of Alabama

2006-8-31 Motor Calculations • Calculating Mechanical Power Requirements • Torque - Speed Curves • Numerical Calculation • Sample Calculation • Thermal Calculations Calculating Mechanical Power Requirements Physically, power is defined as the rate of doing work. For linear motion, power is the product of force

More### Hydropower - Engineering ToolBox

2021-12-3 Online Hydro-power Calculator. The calculator below can be used to calculate available hydroelectricity power. The theoretically power available from falling water can be expressed as. Pth = ρ q g h (1) where. Pth = power

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