Morrell C-model. Applies to both SAG and ball mills, with variants for grate-discharge and overflow mills. This model was developed as part of the PhD thesis of Stephen Morrell at the University of Queensland and is the model used in the …

Ball mill power draw predicted from the Denver slide rule, kW 0 200 400 600 Calculated ball-mill power draw from the m odel derived, kW Data compared Line y=x Fig. 2. Comparison of the ball mill power draw from the Denver slide rule and the proposed model. Dashed line corresponds to y=x.

If you size a ball mill based on ; you use the hardness to derive the needed power to reduce to a target size at a particular throughput. From that "power draw" you calculate a shell size from 4 parameters: diameter, effective length, wet or dry? %loaded and % of critical speed.

The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 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 size factor S. Rod and Ball Mills by C.A. Rowland and D.M. Kjos @ Allis-Chalmers

Calculating Ball Mill Throughput. The reactivity of the coal, Throughput, tons/hr. Grindability Several performance parameters are calculated for the pulverizer train. The specific throughput has been calculated at grinding time t = 3 min. Mill Speed - Critical Speed ... How do you calculate ball mill residence time - WikiAnswers.

For 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 ...

formula for calculation of degree of filling in ball mill Nov 10 2012 · Optimization of mill performance by using online ball and pulp mill absorbed power and ball filling degree Figure 4a and 4b Definition of static and dynamic load angles Figure 5 …

The power draw and grinding efficiency of tumbling mills depend solely on motion of the grinding charge and the ensuing ball collisions that utilize the input power to cause particle breakage. Empirical correlations developed to calculate the mill power draw from design and operating

The fraction of mill volume occupied by rocks, grinding media and slurry in grinding mills are dominant factors influencing AG and SAG mill power draw and grinding rate.

AG/SAG/Ball Mill Sizing. Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator.

This ball mill and rod mill power draw model is based on a torque model and empirical measurements made by the equipment company for use by its sales representatives to size grinding mills slight differences in the equations used allow rod mills,Calculation Of Power For Ball Mills And Grinding.

Calculation Of Power For Ball Mills And Grinding- EXODUS. This ball mill and rod mill power draw model is based on a torque model and empirical measurements made by the equipment company for use by its sales representatives to size grinding mills slight differences in the equations used allow rod mills,Calculation Of Power For Ball Mills And Grinding.

Latest product information Power Calculation Formula Of Ball Mill Power Calculation Formula For Ball Mill. The power (in kW) required to turn a ball mill is approximated by P = 0.285 d (1.073-j) m n where d is the internal diameter in metres j is the fraction of the mill volume occupied by media m is the total mass of media in the mill in ...

Analysis of Power Draw in Ball Mills by the Discrete Element Method. Abstract Ball mills, like other comminution devices, consume large amounts of energy. Mill operators often have to assess the power draft of mills for an entirely different set of operating conditions or for a reconfigured circuit. It is shown that the power draft can be ...

Calculation of the power draw of dry multi-compartment ball mills 225 The mill load that is the volume of charge in the mill is the principal determinant of power draw. Estimation of the ball load that is mixed with the cement charge is difficult and can be highly erroneous. So direct measurement must be taken for calculation of mill load.

Then, is possible to calculate the average power during a revolution of the tool (considering the same value, while the milling cutter is totally engaged in the workpiece). 3.2.1. Calculation of the instanteneous power during milling The instantaneous …

• 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. 3. The % fines in the circuit product.

Calculate Ball Mill Grinding Capacity 2020317 A Total Apparent Volumetric Charge Filling including balls and excess slurry on top of the ball charge plus the interstitial voids in between the balls expressed as a percentage of the net internal mill volume inside liners ... CALCULATION OF THE POWER DRAW OF DRY 20041013calculation of the power ...

Mill Ball Mill Ball Consumption Calculation. Calculations for ball mill calculation capacity ball mill xball mill the specific power consumption of clinker gypsum grinding in the ball mill should be about 3000 cm2 g 244 kwht 3200 cm2 g 268 kwh t 3400 cm2 g 294 kwh t 3600 cm2 g 320 kwh t 3800 cm2 g 347 kwh t 4000 cm2 g 375 kwt note the specific ...

The Bond equation is used to calculate ball mill specific energy from T 80to the final product P 80size. The total circuit specific energy is the sum of the SAG mill and ball mill specific energies. W SAG= R (Ms+16000)/(Ms.447.3) (4) W T= K a . K b . W SAG . [10. BWi. (T 80 -0.5-1700-0.5). EF5] + W BM . K BM(5) Where: W

Ball mills are predominantly used machines for grinding in the cement industry. Although ball mills ... the ball mills for obtaining maximum production and minimum specific energy consumption. ... Roller press in semi finish and finish grinding mode .... The velocity of gases calculated through mill is 1.29 m/sec.

Ball mill motor capacity power equatioon. ball mill motor capacity power equatioon Ball Mill Design Power Calculation - LinkedIn. 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.

The power draw of the mill is then obtained by multiplying KWr by the tons of rods in the mill, which yields: KW = (πD²/4 L V pρ) (1.07 D.34 (6.3-5.4 Vp ))Cs…………………………………………………. (3) KW = mill power draw at the pinion shaft, kilowatts. p = rod charge bulk density, tons per cubic foot. L = mill effective working length, feet.

GROSS 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 ball load, at which the mill draws maximum power, is about 53%. The simulation results of 0.762-m mill running at 60% critical speed are plotted in Fig. 4. The relevant operating and simulation parameters are listed in Table 3. The calculated power draft is maximum at about 50% ball load.

The maximum power draw in ball mill is when ball bed is 35-40 % by volume in whole empty mill volume. Considering that ball bed has a porosity of 40 %, the actual ball volume is considered to be ...

Calculation of the power draw of dry multi-compartment ball mills 18 Jun 2004 ... Key words: power draw, cement, dry grinding, ball mill... Kwb – Kilowatts per metric ton of balls .... Power draw of cylindrical section, kW. Pc.

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 …

For every mill filling, the numbers of big and small balls were changed and 11 scenarios were chosen. The results showed that at a constant mill filling, the power draw was changed with changing the ball size distribution and for all mill fillings the maximum power draw occurred when the fraction of small balls was between 3040%.