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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 Priceon 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 PriceMill Power Draw (Bond Method) Based on a large number of observations, power draw was determined to be: In practice, the mill shaft power for wet overflow mills calculated using the above expression appeared to overestimate the actual power when: Maximum ball size, d max < 45.7; Mill inside diameter > 2400mm ; Bond Wet Overflow Mill Corrections. Corrections to
Get PricePower 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 PriceMill 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 PriceEnter the width of a mill shell liner. Note this is not the width of a lifter! You may use the Mill Liner Effective Width calculation to determine this value. The mill critical speed will be calculated based on the diameter (above) less twice this shell liner width. Mill Actual RPM: Enter the measured mill rotation in revolutions per minute.
Get Priceapproach to modeling of mill power draw. Trans. Instn. Mining. Metall. (Sect C:Mineral Processing Extr Metall.) 105, January-April 1996 ppC54-C62. Austin 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
Get PriceWe 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 PriceMILL POWER DRAW AND THROUGHPUT CAPACITY : Circuit ton/hr Ore Hardness Grinding Task Specification SAG and Ball's Grinding Circuit Throughput Forecasting Mill Specification Grinding Task Mill Speed Charge GRINDING CIRCUIT CAPACITY : Mill Throughput Capacity Grinding Circuit Capacity : Assumed from Bailey et al, 2009 SAGDesign Mill Throughput Calculation
Get PriceSAG 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 PriceFigure 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 PriceFor 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 Pricemaximum 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 PriceOperating 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 PriceGROSS 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 Price01.01.2015· Two new SAG milling models are developed in this work, able to predict power or specific energy consumption, including the usual design variables such as mill size; balls charge level, solids concentration in the SAG mill feed and % of critical speed, but adding a variable that represents the feed size distribution. The −6″ +1″ (−152 +25 mm) size class was used
Get PricePower 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
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Get Price01.01.2014· 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
Get Pricecalculated, 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
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