The circuit consists of a 60 x 113 primary crusher, two 16 MW SAG mills and two 16 MW ball mills. All four mills are twin pinion with wound rotor motor and gearbox drives. Provision for pebble crushing is ... to determine plant throughput and mill power draw. A more complete list of comminution data is provided in Appendix 1. Table 1 ...
where two SAG mill power models are developed. The first model calculates the mill power draw by combining several individual data-driven algorithms. The second model uses historical data to forecast the mill power draw …
power draw of an AG/SAG mill to drop can be gauged by switching the discharge mechanism choice in the model from grate to overflow when predicting the power draw of an AG/SAG mill. 4 Figure 1 – Measured vs Predicted Motor Input Power . 0 2000 4000 6000 8000 10000 12000 14000
The designs of autogenous and semi-autogenous (SAG) grindings mills are described followed by the description of their methods of operation in grinding circuits involving crushers and ball mills. Methods of estimating SAG mill volumes, mill charges, feed size and power consumptions and optimum speeds of rotation during operation are …
Figure 3 – Accuracy of Prediction of AG/SAG Mill and Ba ll Mill Power Draw (equa tion 3) Simulation Models The succe ssful appli cation of modelling and simulation in design and optimisation ...
SAG Mills. Vp Estimation provides three different methods for determining the mill volumetric load (Vp). Power Draw models for predicting SAG mill power draw characteristics. Ball Charge Estimation can be used to provide an estimate of the percent steel in the overall charge for your SAG mill based on power draw models.
However, the trend is clear in that as ball mill feedrate increases the power draw falls. As can be seen the average power draw is about 12.5 MW and occurs at a feedrate (new feed plus recy cle) of about 6000 t/hr. Over a wide range of feedrates about the mean value of 6000 tph the power draw varies by only +/- 5%. Of note
... The process variables that are linked to the SAG mill are used in clustering, such as weight or bearing pressure, power draw, feed size, feed rate, percent solids, acoustic …
charge. This indicates that lifter shapes installed in the mill also have an effect on the power draw profiles. Moreover, mill testing was carried out to measure load cell force of the 1-meter mill installed with the three lifter configurations at the operating conditions: 31% charge (13% ball & 18% rock), 70% critical speed [5]. Figure 2 shows ...
1659 dmtph), power draw (1300 to 6780 kW), power draw per tph (3.6 to 26 kWh/t), and SAG product size (P80 from 124 to 2570 µm). At all five SAG plants, belt samples were taken during periods in which the mill was treating soft and hard ore. Multiple repeat tests showed that careful sampling over a one
The methods on how to manage the changing variables around SAG mills have improved over the years with new instrumentation and Advanced Process Control () systems. Despite these improvements, there is a gap between the available technologies and achieving the maximum potential of the SAG mill performance. The gap traditionally …
7.0 m length (190) single SAG mill equipped with a 20 MW electric motor. The SAG mill product flows to two 3.6 m (120) by 7.3 m (240) horizontal screens, whose combined oversize (pebbles) is diverted to two MP 800 cone crushers. The crushed product returns to the SAG mill feed, closing the primary grinding circuit. The horizontal …
The purpose of a mill power draw model is to predict what the mill power and/or torque draw will be for a mill of a certain geometry containing a specified charge being tumbled at a specified ...
In a SAG mill the dimensions of the mill were 9.75 m × 3.5 m and the specific gravities of the mineral and that of the balls charged were 4.1 and 7.9 respectively. The mill was rotated at 75% of its critical speed when 8 % of the mill volume was charged with grinding balls. Estimate:1. The mill power drawn, 2. The maximum mill filling possible.
A single size category, typically 80% passing, is used in order to simplify the equations. These models are also used in plant design as they dictate how much grinding power is required to break a rock at a desired throughput rate. Specific energy models are combined with mill power draw models in almost all mill designs.
The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to - determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using Equation
be expected to behave in a different manner when fed to a sag mill. Despite the limitations of using the F80 it can be seen from Figure 2 that on average an increase in F80 for this particular mill (sag mill with 12-15% balls) causes a higher specific energy and a consequent lower throughput at constant mill power. Over the range of F80 covered ...
1. ТОЙМ СТАТИСТИК 1 Б.Батзориг, НЭМС, ЭБТэнхим. 2. АГУУЛГА Төвийнхандлага ба байршлын үзүүлэлтүүд Хэлбэлзэл Тархалт, тархалтын хэлбэрүүд 2. 3. ТОЙМ СТАТИСТИК Өгөгдөл цуглуулах Асуумж гм ...
where two SAG mill power models are developed. The first model calculates the mill power draw by combining several individual data-driven algorithms. The second model …
The power draw of the SAG mill has room for significant improvement. As ball filling in the SAG mill is quite low, additional grinding media would likely increase the processing capacity of the SAG mill; however, the capacity of the ball mill, with installed power for the required product size of 170 µm, has reached its limit. ...
In this paper, combined with shear impact energy model (SIEM) and discrete element method (DEM), the particle collision energy spectrum was applied to analyze the influence of ore filling level and media filling level on the power draw of the mill, the impact energy on ore, and the wear of liner and media in a slice of an industrial SAG mill.
In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling...