Development MPC for the Grinding Process in SAG Mills …
This work analyzes the process of grinding rock in SAG mill and the wear of lifters. The discrete element method (DEM) was used to simulate the grinding of apatite-nepheline ore in a mill using different types of linings and determining the process parameters. ... Using various software products based on DEM modeling, experts determine the ...
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Operation Analysis of a SAG Mill under Different …
As one of the machines widely used in mining, a semi-autogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of significant energy consumption and …
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Blasting design for increased SAG mill productivity
This conforms to the breakage rate observed in laboratory testing. As demonstrated in the preceding discussion, blasting and in situ rock properties determine the feed and, therefore, the product of the SAG mill. SAG mill throughput is in turn a function of the proportion of the critical size fraction that tends to accumulate in the SAG mill.
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Optimization of a SAG Mill Energy System: Integrating …
into the operation of a SAG mill has potential to reduce the total energy cost by 27%. Robustness against climate change can be achieved with an increase in total cost of 1%. Finally, use of …
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Multi-component AG/SAG mill model
The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill performance remains quite limited.In an effort to quantify these effects for modelling purposes, a series of laboratory, pilot scale and full scale tests, using multi-component feeds were …
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SAG Mill Operating Load : SAG Mill Volumes
How much rock and balls must you hold in your SAG mill for it to best operate? 911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise. | SAG Mill Operating Load : SAG Mill Volumes.
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Research on Optimization of Lifter of an SAG Mill Based on …
The unreasonable parameters of mill liner lifter bars will not only decrease the operating rate of the mill and increase electricity consumption but, also, seriously restrict the production capacity of the mill. Therefore, optimizing the parameters of liner lifter bars is helpful to save energy, improve its production capacity, and increase benefits for enterprises. Given the …
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Research on performance of a laboratory-scale SAG mill …
When the rock shape is non-spherical, since the EDEM software makes contact judgments when the particles are generated, the actual volume of the generated rock particles may account for less than 20%, but the difference is small. ... The change of the variation coefficient of the SAG mill speed with the rock shape during the startup phase is ...
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Predicting SAG/AG Mill and HPGR Specific Energy …
3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being …
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SINGLE STAGE SAG/AG MILLING DESIGN
xLoad stability with large rock size and a small mill volume. xPebble extraction rates and discharge designs in the pilot mills. ... The SAG mill model in the JKSimMet software has not been shown to accurately reproduce the performance of a single stage mill for greenfield design. A review of most modern power models shows that the prediction of
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Predicting SAG/AG Mill and HPGR Specific Energy …
3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size, hence giving a potentially cost effective way to
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Relationship among operational parameters, ore …
The A and b parameters, in conjunction with Equation (2), are used in SAG mill modeling for predicting how rock breaks inside the mill. From this description the model can predict what the throughput, power draw, and product size distribution will be. ... The comminution of soft ores in the SAG mill resulted in the products having higher ...
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Design SAG mill production when you need it most: In …
It provides information on rock classification and mineralogy which enhances the knowledge of the mine and answers questions on ... SAG Mill ore hardness kWh/t: Energy required to grind an ore from F80 of 152 mm to T80 of 1.7 mm. It is a resulting value from the SAGDesign test. No other test accurately reports SAG
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Evaluating the Effect of Feed Particles Size and Their …
Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P80 of the mill product decreased from 611 to 355μm, and the mill ...
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Operation Analysis of a SAG Mill under Different …
A SAG mill grinds through the impact of rock and grinding media, while an autogenous mill grinds only through the impact of ... fracture mechanism of rock, and found that soft rock was …
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Optimization of a SAG Mill Energy System: Integrating Rock …
The SAG mill will draw from one of the two stockpiles at will to minimize the energy cost. If one of the stocks is emptied, the ore from the other stockpile is used. Stockpiles are modeled using a first-in first-out approach. In our application, a simplified heuristic is used to feed hard rock during the day and soft rock during the night.
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SAG vs. AG Mills: Understanding the Key Differences
The type of grinding media used in each mill has a significant impact on the performance of the mill. SAG Mill Grinding Media. SAG mills use a combination of steel balls and rock particles as …
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SAG Mill
If you use very soft rock in a SAG mill it will not work as well as if you use harder rocks. Adjustments to the lifting plates around the circumference of the mill provide greater lift …
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Semi Autogenous Grinding (SAG) Mill For Sale, …
The filling rate of steel ball in the shell of the semi-autogenous mill is a main item to distinguish SAG mill and autogenous mill. In order to eliminate the impact of the accumulation of rock, the autogenous mill allows to add about 3% of the …
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THE COMMINUTION CIRCUIT DESIGN FOR THE …
mill work index 11.4 kWh/t and an average RQD of 44%. RQD values of 25% resulted in a SAG mill feed size (F80) between 55 and 60 mm and throughputs of 6200 t/h. RQD values of 55% resulted in SAG mill feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and ...
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(PDF) Optimization of a SAG Mill Energy System: Integrating Rock
Hard rock is associated with high specific energy consumption, and soft rock, with low specific energy consumption. Keeping the throughput constant, but selecting high or low specific energy consumption blocks for the SAG mill feed allows the energy requirement to be managed, while satisfying the production.
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C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "single-stage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
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Understanding the SAG Mill in Copper Ore Mining Process
Taking care of a SAG mill through proper maintenance and repair is vital for long-term reliability and efficiency in copper ore mining operations. Real-life Examples of SAG Mills in Copper Ore Mining. SAG mills have been a critical component in the copper ore mining process for …
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PARAMETER OPTIMIZATION OF LARGE SAG MILL LINER …
Due to its strong lifting capacity and excellent grinding performance, the trapezoidal liner is widely used in the SAG mill. The structure of the trapezoidal liner is shown in Fig. 1, the main dimensions are: dip angle (tau), length of the top edge (L) and height (h).Dip angle (tau) determines the trajectory of the mediums in the SAG mill, which directly affects the …
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(PDF) Influence of explosive energy on the strength of the rock
SAG Mill Throughput (tph) S. Michaux, N. Djordjevic / Minerals Engineering 18 (2005) 439–448 Influence of ore breakage characteristics on SAG mill throughput 2000 y = 28.596x + 673.37 1900 2 R = 0.9968 1800 1700 1600 1500 1400 25 30 35 40 45 Ore Breakage Parameter (A*b) Fig. 10. SAG mill throughput and ore residual strength.
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Optimization of a SAG Mill Energy System: Integrating Rock …
The SAG mill will draw from one of the two stockpiles at will to minimize the energy cost. If one of the stocks is emptied, the ore from the other stockpile is used. Stockpiles are …
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Development MPC for the Grinding Process in SAG Mills …
The rapidly developing mining industry poses the urgent problem of increasing the energy efficiency of the operation of basic equipment, such as semi-autogenous grinding (SAG) mills. For this purpose, a large number of studies have been carried out on the establishment of optimal operating parameters of the mill, the development of the design of lifters, the rational …
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SAG Mill Ball Size Evaluator | Evaluation Factors | Calculate …
Now, lets suppose you have a SAG Mill and Ball Mill that are not drawing full kW Power. The SAG Mill has a "small" circulation load of oversize given be the 3/8″ trommel screen and the 1/2″ x 1 1/4″ discharge grates.
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Influence of feed size on AG/SAG mill performance
The data were obtained from a sag mill circuit that was being fed by a stockpile which was drawing down. The sag mill feed conveyor was fitted with an on-liner sizer using image analysis, whilst the stockpile had an ultra-sonic indicator which tracked its level down to a certain point below which excessive noise made further measurement inaccurate.
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Multi-component AG/SAG mill model
The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill performance remains quite limited. In an effort to quantify these effects ... The patterns of rock comminution within tumbling mills, as well as the nature of forces, are ...
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