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.
PDF SAG milling at the Fimiston plant KCGM In the above the mill weight and the mill power draw are the . while rejecting the pebbles or forward-feeding crushed pebbles to the ball mills has an even larger effect on SAG mill capacity.
Improved mill control at Lihir Gold Mine in Papua New The SAG mill weight measurement combines mill shell mass charge mass and liner mass. Powell 2006; 2009 via a series of mill charge inspections at various operating mill weights confirmed that strong relationships can be developed between volumetric mill filling and mill weight. Figure 9 displays histograms of mill power speed weight
TECHNICAL NOTES 8 GRINDING R. P. King 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
SAG Mill Power Model - Grinding and Classifi ion Circuits Which power model is the most efficient to predict the correct power consumption in sag mill with change in process variables?I have developed a few dynamic simulators for different mineral/metal processing plants. Prediction of correct sag mill power consumption with a change in ore hardness solid
SINGLE STAGE SAG/AG MILLING DESIGN If determined to be reasonably power-efficient single stage SAG milling is likely to be a comparatively profitable grinding circuit design. xMedium Grind – 80% passing size between 106 and 75 µm. To mill in single stage SAG configuration the feed must be consistent and the downstream process reasonably capable of handling some fluctuations
Modelling SAG milling power and specific energy consumption In Fig. 3 Fig. 4 the data is presented in order to show the effect of the fresh feed size particularly the % −6″ 1″ −152 25 mm on the SAG mill power consumption Pc in kW and on the SAG mill specific energy consumption Ecs in kW h/t obtained by dividing the power consumed kW by the fresh feed rate t/h .
A comparison of SAG mill power models SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. wC is the charge %solids fraction by weight e.g. 0.80 for 80%
AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING.COM Logan Lake Canada ABSTRACT 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 over the world. The
t10 % Weighted Fit 63 x 53 - SMC Testing to 3.866. For each simulation the feed rate was adjusted until the total load volume in the SAG mill was 25 %. The predicted mill power draw and crusher power draw were combined and divided by the feed rate to provide the specific energy consumption. The results are shown in . Figure 3. Figure 3: The relationship between A*b and specific energy
Modelling SAG milling power and specific energy Fig. 1. SABC A/B milling circuit. Scw = solid concentration by weight fraction in the SAG mill feed; Jb = balls charge bulk fraction of the SAG mill volume ; N/Nc = fraction of the SAG mill critical speed; Pc = SAG mill power consumption kW ; % 600 100 = % of the fresh feed in the size range 152 25 mm. M. Silva A. Casali/Minerals
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.
RESPONSE OF PRIMARY GRINDING MILL PERFORMANCE TO CHANGES IN where the centre of rotation of the pendulum weight is within 2.7 m of the centre of rotation of the grinding mill and when a power cable can be run between the power supply and a transmitter box mounted either in an adjacent girth gear or on the shell of the mill. Alternatively power could be provided by a suitably designed battery box.
Comparison of Ore Hardness Measurements for Grinding Mill soft the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and analyzed by Contract Support Services Inc. Table 4: Summary of 6 JKTech Drop Weight Tests JKSimMet Parameters By 12 3456Avg of 6 A maximum breakage CSS 42.5 63.5 68.1 61.1 57.3 60.5
AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION SAG mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. The wC is the charge %solids fraction by weight e.g. 0.80 for 80%
Modelling SAG milling power and specific energy In Fig. 3 Fig. 4 the data is presented in order to show the effect of the fresh feed size particularly the % −6″ 1″ −152 25 mm on the SAG mill power consumption Pc in kW and on the SAG mill specific energy consumption Ecs in kW h/t obtained by dividing the power consumed kW by the fresh feed rate t/h .