Grinding Mill Computer Model
of the mill data base with only a limited number of variables considered. 3.2 Rod Mill Design A different approach is taken with the rod mill design where equations by Bond and Rowling are used to calculate the mill power draw. The Morgärdshammar equation and the IMM equations are shown for comparison. The method of use is similar to the AM ...
SAG Mill Grinding Circuit Design - 911metallurgist
SAG mills have a higher installed power density for a given plant footprint relative to AC mills. With the combination of finer grind and a lower installed power density (based on the lower density of the mill charge), a typical AG mill has a lower throughput, a lower power draw, and produces a finer grind.
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 consumption but will not satisfy
Calculate the power consumption of the welding inverter ...
The resulting result is divided by the value of the efficiency of the device. YouTube. 160 A x 23 V / 0.89 = 4135 watts. 4.1 kW is the power that the device consumes directly during welding. Average power is calculated by multiplying the maximum power value by the duration of the on-time: 4135 watts x 0.6 = 2481.
Electric Motor Torque Calculation Formula & Torque ...
How to calculate torque of motor: Torque is nothing but a momentary force developed at the time of force is applied to the motor. The unit of torque is N.m (Newton-meter). In other words, Torque T (N.m) is equal to the ratio between the electrical power P (W) in watts to the acceleration.
A Method of C alculating Autogenous/ Semi-Autogenous ...
of the energy required by a SAG mill. Put another way, the SAG mill energy required according to this statement, is 2.5 times more than the Ab value to produce the same degree of particle breakage. There is a speci fi c gravity factor that affects AG/SAG power draw. The lighter material, in the 2.5 specifi c gravity (SG)
calculation of mill filling degree
Nov 10 2012 · Optimization of mill performance by using online ball and pulp mill absorbed power and ball filling degree Figure 4a and 4b Definition of static and dynamic load angles Figure 5 PSD–mill discharge primary mill More detailed
Membership functions for SAG mill feed power draw ...
As an example, consider Figure 4 which shows MFs for SAG mill power draw as an input variable for fuzzy system. Five linguistic expressions …
Effect Of Sag Mill Feed Size Distribution And Ore
calculate sag mill power draw. IV 124 STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL ... Effect Of Sag Mill Feed Size Distribution And Ore. ... and distribution applications such as sag ... Detail About. effect of balls charge on sag mill performance.
Throughput optimisation in milling circuits
If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. The feed rate setpoint can then be tied into a SAG mill power optimisation strategy. SAG mill discharge control is quite involved due to few interactive variables, such as mill discharge sump level, classification ...
Calculating Sag Mill Power
2019 12 12 SAG mills choosing based on F Bond s working indices calculation a SAG mill is a mill type for the material grinding with a larger diameter than its length The steel grinding balls with large diameters from 100mm to 125mm and above are the grinding media in such mills Common to all methods is a full assessment the useful power of ...
How To Calculate The Ball Mill Discharge Size Distribution
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
Relationship between SAG mill power draw, bearing …
Download scientific diagram | Relationship between SAG mill power draw, bearing pressure and feed rate. from publication: Supervisory Fuzzy Expert Controller for …
MILLING CONTROL & OPTIMISATION - Mintek
close to the maximum mill power draw. The power-load relationship ... Figures 8 and 9 on the right show results from a gold plant's SAG mill achieved with MillStar's Segregated Ore Feed Controller ... Mill Power Optimisation results for Case Study 2 Figure 9: Feed Control Distribution for Case Study 2.
(PDF) SAG mill power draw simulation using variance ...
Using Monte Carlo simulation showed that the mean power draw of Sarcheshmeh SAG mill is about. 9349.75 kW with a standard deviation of 983.2 kW, with the highest frequency occuring between 9058.5 ...
Autogenous and Semi-Autogenous Mills - ScienceDirect
AG/SAG Mill Power. In designing crushing–grinding flow sheets, correct estimations of mill power draw are important as it serves as one of the deciding factors for selecting an option between AG/SAG mills. In most cases, the circuit with the least or optimal power consumption is the preferred choice.
The effect of ball size distribution on power draw, charge ...
grinding media motion in the ball mill and calculate the power draw (Djordjevic et al., 2004). The power draw calculated using PFC3D refers to the total power draw accumulated for each particle and ball in the mill (Djordjevic, 2003). Table 1. Mill specifications Property Value Effective mill diameter (cm( 25 Effective mill length (cm) 25
MODULE #5: FUNCTIONAL PERFOMANCE OF BALL MILLING
Figure 2 illustrates that the total mill power draw multiplied by the classification system efficiency is the effective mill power draw *. The effective mill power draw is the power draw that is applied to the grinding of coarse particles. Figure 2. The "effective mill power draw". Now let's see how the remaining two terms, ore grindability and ...
Simulation of a Laboratory Scale Ball Mill via Discrete ...
wear, and power draw in a ball mills through DEM simulation. ... ture in an SAG mill, which are near to those measured experimentally. Addi-tionally, Cleary and Hoyer [14] showed good agreement between DEM simula- ... eighth step is to calculate density. The ninth step is to modify particle position, velocity, and time step. It all of the steps ...
Optimization of mill performance by using
Mill power Usually, plant operators use mill power readings as an indicator of ball filling degree and, often, try to keep it at the maximum level. It is well known that the mill absorbed power depends on operating parameters other than ball level, such as pulp density and liner configuration. Figure 2 shows that there is no linear relation between
How Much Electricity Does a Treadmill Use? Treadmill Power ...
Treadmill Power Consumption and Bill Estimate Calculator. To make the process of buying a treadmill easier, we've created a simple calculator that you can use to determining the approximate cost of using a treadmill. Please enter the information in the calculator and see an estimate of your monthly electric bill because of your treadmill.
GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY …
provides examples of how to calculate the Bond Work Index Efficiency ... • Obtain the power draw of the size reduction equipment at the drive pinion(s) ... SAG-Ball Mill Circuit SAG-ball mill circuit F80 = 165,000 µm P80 = 125 µm W = 14.6 kWh/t . 16.8 kWh/t .
AG/SAG/Ball Mill - metengineer
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.
Application of Operating Work Indices in Autogenous ...
power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2), which renders to the AG/SAG mill the credit for the fraction of the material that had been already ground to final product (Q1). To calculate the operating work indices,
Morrell C-model - SAGMILLING
This motor input is immediately converted to mill shell power for use in circuit model equations by multiplying the model result by 0.97 mechanical efficiency factor and by 0.96 typical induction motor efficiency factor. The displayed Morrell C-model result in sagmilling is always corrected to mill shell power . Categories: Models
An improved method for grinding mill filling measurement ...
Spreadsheet calculator and procedure pdf supplied as supplementary material. Abstract. 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. Hence accurate mill filling measurements are needed for modelling mills. To that end, it ...
Operating work index is not the specific energy consumption
To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated …
UNIVERSITY OF TORONTO FACULTY OF APPLIED SCIENCE …
11. 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 4.5 inches and the mill discharge has an 80 percent passing size of 2.2 mm. (1 hp = 0.75 kW; 1 inch = 2.54 cm) Calculate the Operating Work Index for this mill if the feed tonnage rate was 1250
Calculating the Sagitta of an Arc (and other arc parameters)
The diagram below will help to visualize the quantities involved and their relationship to each other. The circular arc is in red and is of radius r.The chord (span) connecting the ends of the arc is divided in half, and that is labeled l in the diagram. Finally the sagitta, the displacement or deflection of the highest point of the arc from the mid point of the chord is …
Orway Mineral Consultants Canada Ltd. Mississauga, ON ...
The Bond equation is used to calculate ball mill specific energy from T 80to the final product P 80size. The total circuit specific energy is the sum of the SAG mill and ball mill specific energies. W SAG= R (Ms+16000)/(Ms.447.3) (4) W T= K a . K b . W SAG . [10. BWi. (T 80 -0.5-1700-0.5). EF5] + W BM . K BM(5) Where: W
calculated power draw for wet overflow rod mills
calculate the efficiency of wet overflow ball mill. 9 Apr 2018 Results show that mill grinding efficiency decreases as the liner wears but 10 Figure 2 2 Model to Estimate the Power Draw of a Ball Mill Cylindrical Portion . percent ball loading percent of critical speed and mill type (overflow or V. Zhen L. (2013) 'Modeling ball impact on the wet mill .
A 1 kg sample of a new ore was ground for 10 minutes in a ...
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 6.4 inches and the mill discharge has an 80 percent passing size of 2.6 mm. Calculate the Operating Work Index for this mill if the feed tonnage rate is 1200 tonnes per hour.