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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 the no-load power…

bond ball mill work inde equation in wills. ... · Power draw Standard of mill(s) (@ pinion(s)) = 3,150 kW . Circuit Feed F80 =2,500 µm . Circuit Product P80 = 212 µm . Test WI of circuit feed ore = 16.1 kWh/t (The Bond ball mill test Work Index of the ore, whichapplies over the size reduction range ...

Equations for mill sizes less than 3.81meters in diameter and greater than 3.81meters were proposed: t/h D < 3.81 m t/h D > 3.81 m ... Wet Ball Mill Power Draw (Bond) For wet ball mills, Bond expressed power draw as a function of the total mass of media:Pâ†“M / Mâ†“B ...

Equation 1 to drive the corrected power requirement (Rowland, 1982). The equation for Third Theory of Comminution Bond’s was originally developed for use with conventional crushing and grinding circuits (crusher-rod-ball mill or crusher-ball mill). By the 1970s, the application of conventional tended to be limited to relatively low capacities.

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 adjusted to provide a mill …

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 ...

Allis-Chalmers has a proprietary equation, adapted from the kilowatt hours per ton of balls (Kwb) equation for calculating ball mill power published by Bond, to determine the power which an autogenous mill or semi-autogenous mill will draw under specified conditions or ore specific gravity, pulp density in mill, mill . More

You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).

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 …

1). In this paper the factors which need to be addressed in order that tumbling mill power draw can. be accurately predicted are discussed. A power model that incorporates each of these factors is ...

To represent the performance of the SAG mill circuit it was decided to use JK Tech’s comminution simulator JKSimMet, whilst the power– -based equations of Bond were chosen for the ball mill circuit (Bond, 1961)T. he so-called variable rates model (Morrell and Morisson, 1996) was used to simulateSAG mill performance, model parameters being

Throughput was hence estimated to be 1636 dry tonnes/hr. Power draw data were confirmed as being measured at motor input. The Morrell Method for grinding mills is based on predicting the specific energy at the pinion shaft. To adjust the power draw measured at the motor input to power at the pinion a 6.5% correction was made.

Rowling are used to calculate the mill power draw The Morgärdshammar equation and the IMM equations are shown for comparison The method of use is similar to the AM section 3.3 Ball Mill Design The ball mill designs also follow the Bond/Rowlings method with comparison with other methods Again the method of use is the same. Get Price

Posts Related to fred bond ball mill power draw equations » bond’s work index ball mill » ball mill circulating load » determination the specific volume of ball mill » hardgrove grindability index mill equipment » planetary ball mill design working ppt. Contact Us. Tel: 86-21-58386256;

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

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 …

Wet Ball Mill Power Draw (Bond) For wet ball mills Bond expressed power draw as a function of the total mass of media (45.72dâ†"max / 50.8) kWtThe F s factor is subtracted from the calculated power draw. The ball size factor F B is added to the mall shaft power for mill sizes greater than 3.3 meters Fâ†"B1.102 (dâ †"max . Chat Online

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 ...

How to Size a Ball Mill Design Calculator Formula. 2015 5 15 The most used equation for this purpose is the empirical Bond equation Bond 1960 1961 Rowland and Kjos 1978 In this equation E is the specific energy . Get Price; Ball Mill Modeling Equations Customer Case

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.

Rowling are used to calculate the mill power draw. The Morgärdshammar equation and the IMM equations are shown for comparison. The method of use is similar to the AM section 3.3 Ball Mill Design The ball mill designs also follow the Bond/Rowlings method with comparison with other methods. Again the method of use is the same

the application of ball mill power from fine (minus P80 product size) to coarse material, ... 350 for wet overflow mills, etc. WI Bond test Work Index, kWh/short ton. SG Ore specific gravity. ... plant mill (the mill power draw divided by the mill solids throughput rate), and assumes plug

There is a mathematical solution to this problem – the Bond formula. It uses to help determine the grinding media optimal size must be loaded into the ball mill for proper operation ensure. The calculation formula is below: B – the grinding balls diameter, mm; A – the correction factor (for grinding balls A = 20,17; for cilpence A = 18,15);

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

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

The Wi value from this equation should conform with the motor output power to an average overflow ball mill of 8 ft. interior diameter grinding wet in closed circuit. For dry grinding the work input should normally be multiplied by 1.30. However, ball coating and packing can increase the work input in dry grinding.

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.

Rod Mill-Ball Mill Circuits Diagrams of mill circuits [image: (135-8-2)] ... The Rowland and Kjos equation indicates that power draw is a function of the fraction of the critical speed for the mill. ... Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: ...

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...

& 0183; 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 3.3 meters 10 feet diameter inside liners the top size of the balls used affects the power drawn by the mill.

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 JK SimMet software for determining mill power draw.

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.

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 ...

Bond’s power draw equation suggests that (9) P∝J(1−0.937J) where, J is ball load. The ball load, at which the mill draws maximum power, is about 53%. The ball load, at which the mill draws maximum power, is about 53%.

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 ...

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