# Calculate Sag Mill Power Draw

### The SAG grindability index test - ScienceDirect

01.01.2014· The relevant equation expressed the mill power draw per unit throughput as a function of the SPI™ and T 80, as follows (Starkey and Dobby, In this configuration, the apparent transfer size is calculated as the weighted average of the SAG classifier undersize and the pebble crusher product. The data are shown in Fig. 8. Some interesting observations can be made: • The mill "efficiency

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Eaton's Power Consumption Calculator. Figure out how much power you are consuming. Try our Uninterruptible Power Supply Calculator and Selector Tool

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

We know how to calculate the power an AG/SAG mill will draw at the pinion based on the charge levels, mill speed and material weights using comparative methods, SMC's method or empirical formulae. This task has been solved. The problem is how to calculate the process SE in kWh/t at the pinion to do the work, applying only laboratory parameters.

Get Price### AMIT 135: Lesson 6 Grinding Circuit – Mining

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### Deep Drawing Force Calculator - CustomPart.Net

Calculate the required force to deep draw a piece of sheet metal based on the drawing ratio, sheet thickness, and the ultimate tensile strength of the material. The drawing ratio is a measure of the severity of the drawing operation and is the ratio of the initial blank diameter to the punch diameter. For a given material, the limiting drawing ratio (LDR) is a measure of that material's deep

Get Price### EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL

Figure 5.11 Power variation with mill speed for different media shapes (J=15%).86 Figure 5.12 Power variation with mill speed for different media shapes (J=20%).87 Figure 5.13 Power variation with mill speed for different media shapes (J=25%).87 Figure 5.14 Variation of mill power draw with mill filling, J (cylpebs media)..88

Get Price### SAG Mill Grinding Circuit Design -

GROSS POWER CALCULATOR General . This model uses the equations from Morrell's 1993 PhD thesis: "The Prediction of Power Draw in Wet Tumbling Mills". The model is also described in detail in the book "Mineral Comminution Circuits Their Operation and Optimisation" which is available from the Julius Kruttschnitt Mineral Research Centre. The model predicts the gross power

Get Price### Mill (grinding) - Wikipedia

SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their

Get Price### SAGMILLING.COM .:. Consulting

Operating mills that want to use geometallurgy for production forecasting should perform a milling circuit survey to provide calibration parameters for the model to be used in the production forecast. This can be as simple as determining the "CF" factors for Bond-based calculations to more complicated SAG/Ball mill power draw model calibrations for ores of variable density.

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

calculated, given known mill power draw, throughput, feed and product size distributions. kWh/t = Power applied per ton of feed to the grinding unit Wi = The standard Bond work index of the ore P 80 = The 80% cumulative passing size of the product in microns F 80 = The 80% cumulative passing size of the feed in microns In the 1970s, Rowland proposed using the Wio as a

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

calculated, given known mill power draw, throughput, feed and product size distributions. kWh/t = Power applied per ton of feed to the grinding unit Wi = The standard Bond work index of the ore P 80 = The 80% cumulative passing size of the product in microns F 80 = The 80% cumulative passing size of the feed in microns In the 1970s, Rowland proposed using the Wio as a

Get Price### Optimizing Performance of SABC Comminution Circuit of the

on the ball mill was on the high side, with an actual operating power draw of 5300 kW, meaning it was operating at 90% of its maximum power. 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,

Get Price### Sag Mill Design Calculations

Power Based Sag Mill Design Calculations. 2015-12-16classify the agsag mill product into two products the phantom cyclone overflow that is similar to the final ball mill product, and the phantom cyclone underflow is then used as an adjusted ball mill feed for the ball mill power calculationhis technique is specifically suitable for model-based calculations, as it requires efficiency curve

Get Price### Modelling: Transfer size limits - SAGMILLING.COM

For example, the SAG mill may have 10 MW of power draw available and the two ball mills each of 7.5 MW of power draw available for a total of ratio of 10:15 (1:1.5). 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 power (1:1.5 in this example).

Get Price### Mill Operators' Conference 2018

maximum power draw well below the installed power. Typically, at startup post SAG mill reline, the maximum operable speed ranges are reduced to minimise direct shell impacts due to the steeper face angle of the lifters. This operational approach severely limits available power draw by the mill to maintain higher throughputs for competent ores. This was seen by PBM as lost opportunity

Get Price### A Method to Determine the Ball Filling, in Miduk Copper

Concentrator SAG Mill Ali Kamali Moaveni1, Mohammad Noaparast2*and Bahram Rezai3 specific power draw, and mill performance. Therein, load density and ball filling percentage in semi- autogenous mill and its effect on the mills power draw is of great value. There exist several ways to calculating ball filling such as drawing out whole internal mill load, taking photographs from load surface

Get Price### EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL

Figure 5.11 Power variation with mill speed for different media shapes (J=15%).86 Figure 5.12 Power variation with mill speed for different media shapes (J=20%).87 Figure 5.13 Power variation with mill speed for different media shapes (J=25%).87 Figure 5.14 Variation of mill power draw with mill filling, J (cylpebs media)..88

Get Price### 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. Models of this type do not predict the particle size

Get Price### Ball Mill Design/Power Calculation

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material 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 and maximum and finally the type of circuit

Get Price### Choosing a SAG Mill to Achieve Design Performance

A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the three-foot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2. Figure 2: Pilot Plant kg/hr Vs Charge % by Volume

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