Jun 19, 2015· The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The following shows how the size or select the matching mill required to draw this power

ball mill power draw 2 pi [ 4.7 5656 Ratings ] The Gulin product line, consisting of more than 30 machines, sets the standard for our industry. We plan to help you meet your needs with our equipment, with our distribution and product support system, and the continual introduction and updating of products.

Describe the components of ball mill. Explain their understanding of ball mill operation. Explain the role of critical speed and power draw in design and process control. Recognize important considerations in ball mill selection. Reading & Lecture. In ball mills, steel balls or hard pebbles to break particle based on impact and attrition.

parameters were collected from 14 industrial ball mills, ranging in diameters from 3.2 to 4.8 m. The ball loads within the mills were measured by different methods proposed in the literature and power draw of each mill were calculated. The results showed that power draw of the cement mills could accurately be predicted by the method proposed in

Oct 19, 2015· Power draw is related directly to mill length, and, empirically to the diameter to the power 2.34. Theoretically, this exponent should be 2.5 (Bond, 1961). Power draw is directly related to mill speed (in r.p.m., or, fraction of critical speed) over the normal operating range.

• Effective mill power draw • Ball mill specific grinding rate • Ball mill grinding efficiency The circuit output is defined as the production rate of fines by the circuit. It is calculated from three values: 1. The dry ore feed rate to the circuit (t/h). 2. The % fines in the circuit feed.

predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

Mill Feed(t/h) & Load(t) 300 1800. Power(kW) 250 200 150 100 50 0 1600 1400 1200 1000 800 600 400 200. MillStar OFF MillStar ON. Mill Overloads Mill Feed Cuts DAY 1 DAY 2 DAY 3 DAY 4 Mill Feed PV Mill Feed SV Mill Load Power. Figure 7: Mill Power Optimisation results for Case Study 1 Figure 8: Mill Power Optimisation results for Case Study 2

Dec 12, 2016· If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a

Dimensional Analysis And Ball Mill Performance result shows that it predicts mill performance within 2% accuracy and can be used to secure maximumanalysis of power draw in ball mills by the discrete element method.a three-dimensional analysis of media motion and grinding region in mills.correlations for the grindability of the ball mill as

• Effective mill power draw • Ball mill specific grinding rate • Ball mill grinding efficiency The circuit output is defined as the production rate of fines by the circuit. It is calculated from three values: 1. The dry ore feed rate to the circuit (t/h). 2. The % fines in the circuit feed.

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.

Sep 01, 2019· For a well-mixed mill, the size of particles inside the mill would be equal to the mill product size (l i = y pi) Analysis of power draw in ball mills by discrete element method, Canadian Metallurgical Quarterly, 38: 133-140. [5] Da Silva, W. P., Gama, F. J. and Gomes, J. P., 2012.

Ball charge level = 35% v/v Motor Power draw = 4.7 MW Ausenco’s Ausgrind Expert Modelling Dia18 x EGL 31 ft : 5500 kW,750 t/h Higher ball charge level but same power draw Modified after Morrell (2016) Modelling the influence on power draw of the slurry phase in Autogenous (AG), Semi-autogenous (SAG) and 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

Apr 08 2018 A motor with around 1400 Horse Power is calculated needed for the designed task. Now we much select a Ball Mill that will draw this power. The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution.

PI Power, MW DEM Power, MW Relative PI Throughput Relative DEM Throughput Closed 6.33 6.33 100% 100% Open 6.46 6.46 104.4% 102-104% It is significant that the predictions are extremely close to the plant determined values. Ball Size Evaluation The selection of an optimum top ball size for a large SAG mill is determined by several factors:

New South Wales followed after two years of extensive laboratory and pi calculated mill gross power draw for the duty. mill power models and JKSimMet's SAG and ball mill power models are

Power draw of wet tumbling mills and its realtionship to charge dynamics Part 2 an empirical approach to modelling of mill power draw. Tran Inst. Min. Met Vol 105: C54-62. 20. MORRELL, S. (1996). Power draw of wet tumbling mills and its relationship to charge dynamics. Part 1 a continuum approach to mathematical modelling of mill power draw.

- Mill water addition (automatic PI control operator or remote set-point from mill Density controller.) However, during the production ramp-up it was quickly evident that despite much effort, the cascade (PI) bearing pressure control was poor and resulted in large swings in both feed and mill charge (Figure 2).

The gravity-induced low speed stirred milling technology, commonly referred to as tower mills, are widely used for fine grinding due to their high energy efficiency compared to conventional tumbling mills. Moreover, the lower operating cost, shorter installation period and simpler operating strategy make it attractive for many mines. Researchers have attempted to develop an ore

Jul 25, 2016· Discrete element method simulations of a 1:5-scale laboratory ball mill are presented in this paper to study the influence of the contact parameters on the charge motion and the power draw. The position density limit is introduced as an efficient mathematical tool to describe and to compare the macroscopic charge motion in different scenarios, i.a. with different values of the contact parameters.

Morrell multi-stage crushing and single-stage ball mill model; Bond HPGR and ball mill model (using work indices) warning, experimental! Morrell HPGR and ball mill model; Mill power draw models. Measurement of power (motor input versus shell, etc.) Media density for rods and balls; Model types: mill power draw. Austin SAG model (hybrid

More reliable models for the prediction of the power drawn by ball, semi-autogenous and fully autogenous mills have been developed by Morrell and by Austin. (Morrell, S. Power draw of wet tumbling mills and its relationship to charge dynamics Part 2: An empirical approach to modeling of mill power draw. Trans. Instn. Mining. Metall.

and therefore we observe an increase in the power draw and as the load was dropped onto the mill toe, energy was released and the power and -2 mm +1.4 mm for experiments. A mill run having a mixture of the 3 ball diameter sizes was also conducted. The ball filling level was kept constant at 40% by volume for all ball diameters as was done by

Module 2 Mill Power Draw: This module provides detailed instruction for determining mill power draw characteristics and capabilities for rod, ball and AG/SAG mills. 2.50 none $139 Module 3 Power & Charge Level Measurements: In this module, you will learn how to measure the power draw and volumetric loading of your mills from

Sep 01, 2019· For a well-mixed mill, the size of particles inside the mill would be equal to the mill product size (l i = y pi) Analysis of power draw in ball mills by discrete element method, Canadian Metallurgical Quarterly, 38: 133-140. [5] Da Silva, W. P., Gama, F. J. and Gomes, J. P., 2012.

SAG mill power draw: 19875 kW. Ball mill power draw: 17980 kW. Pebble crusher power draw: 650 kW. Pebble crusher no-load power: 120 kW. Checks were made to ensure that the throughput data were in terms of dry tonnes/hr. Dry tonne/hr are obtained from raw weightometer readings less a moisture content allowance. Power draw data were also checked

Jul 25, 2016· Discrete element method simulations of a 1:5-scale laboratory ball mill are presented in this paper to study the influence of the contact parameters on the charge motion and the power draw. The position density limit is introduced as an efficient mathematical tool to describe and to compare the macroscopic charge motion in different scenarios, i.a. with different values of the contact parameters.

autogenous (SAG) mill and two ball mills, each with 13 megawatts (MW) of installed power, was expected to the maximum power draw well below the installed power. Typically, at startup post SAG mill reline, the (PI) plant data was downloaded from the site for evaluation.

Aug 30, 2019· 1 Calculation of ball mill capacity. The production capacity of the ball mill is determined by the amount of material required to be ground, and it must have a certain margin when designing and selecting. There are many factors affecting the production capacity of the ball mill, in addition to the nature of the material (grain size, hardness, density, temperature and humidity), the degree of

Ball Millcalculations Ball Mill. Ball Mill Motor Power Draw Sizing And Design Formula. The following equation is used to determine the power that wet grinding overflow ball mills should draw for mills larger than 33 meters 10 feet diameter inside liners the top size of the balls used affects the power drawn by the mill this is called the ball

Analysis of the historic mill power draw, site data on ball filling provided by mill grind-outs, and applying the Morrell Power model (Morrell, 1993) to back-calculate approximate mill filling

- Mill water addition (automatic PI control operator or remote set-point from mill Density controller.) However, during the production ramp-up it was quickly evident that despite much effort, the cascade (PI) bearing pressure control was poor and resulted in large swings in both feed and mill charge (Figure 2).

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

2.2 Mill power The mill power is expected to vary with changes in mill holdup mass, feed size distribution and slurry properties. The equation used here to predict the power drawn by the mill is based on modification of Hogg and Fuerstenau power model.

Equipment Sizing: Crusher or Grinding Mill. These may include packing in a crusheroversize feed or improper ball and rod sizes in a tumbling mill and coating dry ingrinding. Laboratory Tests for Determining Work Indexes. Impact crushing tests as well. crusher and grinding

PI Power, MW DEM Power, MW Relative PI Throughput Relative DEM Throughput Closed 6.33 6.33 100% 100% Open 6.46 6.46 104.4% 102-104% It is significant that the predictions are extremely close to the plant determined values. Ball Size Evaluation The selection of an optimum top ball size for a large SAG mill is determined by several factors:

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