Bond/Rowland Single Stage Ball Mill Model. This is a multi-stage crushing plant feeding a ball mill model that estimates the specific energy consumption (E BM) using the Rowland interpretation of the classical Bond work index equation including Rowland efficiency factors. Testwork Required. Bond ball mill work index; Bond rod mill work index

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 …

Bond work index: Wj= 26.0 kWhlshort ton From Eq. (6), the specific grinding energy is: W = 77.34 kWhlshort ton or W = 85.23 kWhlt For throughput 400 tIh production, the total required ball-mill power is: 85.23 kWhlt x 400 tIh = 34092 kW. If six (6) ball-mills are used, the power drawn from each mill is: (34092/6) = 5682 kW.

Using the feed size and product size from the survey and the results from the SMC Test and Bond tests, Morrell's equations are then used to predict what the expected overall comminution energy should be. ... Ball mill power draw at pinion: 16811 kW. Pebble crusher net power draw: ... A number of samples were taken from the SAG mill feed belt ...

• Transfer size (T80) is the term used to describe the SAG mill product that is sent to the ball mill. For peak performance and balancing the power available in the SAG mill and ball mill, the transfer size must be measured and controlled. • The transfer size will be 500 microns using a 12mm opening trommel. This can be true under special

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.

Modeling The Specific Grinding Energy And Ball. 21 conclusions continued in the present work equations were also derived giving zthe ballmill power drawp as a function of its dimensions internal mill diameter d and length l zthe ballmill power drawp as a function of the feed d f mm and the product size d mm the bond work index w i kwhshort ton and the mill throughput t short tonh zthe ballmill ...

WiBM is the Bond ball mill work index, unitless EF4 and EF5 are the Rowland efficiency factors for oversized feed and fine grinding. Plant surveys El Soldado Six plant surveys were conducted at the Anglo American El Soldado mine between 2013 and 2016. The survey data collection included the power draw of the single-stage SAG mill, the fresh feed

Bond/Barratt Specific Energy Consumption SABC Model. This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi-stage crushing and single-stage ball milling (E ssbm) including Rowland efficiency factors.The circuit E total is equal to the E ssbm plus an inefficiency factor (CF) related to ...

of two or more grate discharge ball mills in series. The same equation is used to calculate the power that each ball mill compartment should draw. The total power is the sum of the power calculated for each of the separate compartments. Although, Bond's method has been widely used, the required link to classification is missing.

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.

grams per revolution (Gbp) is the ball mill grindability. The ball mill work index, Wi (kWh/short ton) is calculated from the following equation (Bond 1961):1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush. The FC …

Mill power Usually, plant operators use mill power readings as an indicator of ball filling degree and, often, try to keep it at the maximum level. It is well known that the mill absorbed power depends on operating parameters other than ball level, such as pulp density and liner configuration. Figure 2 shows that there is no linear relation between

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

Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on ...

The Bond formula (Equation 2) was used to calculate the required power for both compartments (rod and ball) for each scenario. Requirements include: power to maximize the feed rate of the mill while achieving a P 80 of 300 μm, available power (401 kW for rod and 753 kW for ball) and reaching an optimal transfer size between the compartments ...

Power draw, Step 2. The power consumed by a ball mill is described in equation 9.16 in the JKMRC text. The power is a function of mill diameter, volume fraction filled with balls, fraction of critical speed, ball size, and the tonnage of balls in the mill. These parameters are …

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work …

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) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...

Throughout the batch grinding tests, the power draw of the mill was measured using a purpose built power meter to facilitate the calculation of specific grinding energy. Results Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight

Ball Mill Power - The Cement Grinding Office. Bond power formula for monochamber mill, 2 chambers mill and 3 chambers mill: - Hogg and Fuerstenau power formula for monochamber mill, 2 …

plant mill (the mill power draw divided by the mill solids throughput rate), and assumes plug flow and equal residence time of all particle sizes (see later note). The value of E for the torque mill test is the mill energy input divided by the solids load. The energy specific cumulative grinding rate at each screen size is calculated from a

Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further ... data (whenever available) from back-calculation of the first equation above. ...

This paper. reviews some of the issues related to sizing of large diameter ball mills. including power draw, residence time, fe ed size and the applicability of. Bond's equations. Data from a ...

And Support Online; bond mill power equation bezgranici . Rod Mill DesignPower Draw Mineral Processing . The following equation is used to determine the power that a rod mill should draw. The Bottom Table lists many of the common size rod mills giving speed, loading and power data. The rod mill motor power is in horsepower at the mill ...

3. Power draw of the comminution equipment (kW) •In the case of mills, the power draw should be repre-sented in terms of power at pinion for gear and pin-ion drives and at shell for gearless drives. For crushers, this should be the net power draw, that is, the gross (motor input) power draw less …

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 …

Raw Bond Model. This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption (E SAG) using the 1979 Barratt equation and the classical Bond work index equation including Rowland efficiency factors.The model allows a manual calibration factor on both equations (CF SAG and CF ball, respectively).This formula usually gives higher total circuit specific energy ...

tion related to the operation of the circuit (F80, P80, power and mill feed rate). 7.DETERMINING THE BOND EFFICIENCY OF A GRINDING CIRCUIT 7.1Method In the plant: 1. Define the circuit for which the Bond Efficiency is to be determined. 2. Procure samples of the circuit feed and product. 3. Obtain the power draw of the size reduction equipment

Effective mill power draw 24 Ball mill specific grinding rate 29 Ball mill grinding efficiency 33 Progress Review 1 39 PART II - Functional Performance Analysis 43 Using the functional performance equation 43 Functional performance efficiency 47 Relating design and operating variables to grinding, classification, and circuit efficiencies 53

determined by 0.0254 Wh/rev (difference between 0.1331 and 0.1077) or 91.44 Ws/rev. This is equivalent to a power draw of 106. 76 W for the mill with ore and balls and is. very comparable to Bond ...

Grinding Mill Power Scale-Up. Probably one of the most comprehensive experimental investigations of the power demands of the ball or tube mill is that carried out by one of the present authors, with a worker, Rose and Evans by use of small-scale models; the test apparatus being that shown in Fig. 3.1.