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EQUATIONS GIVING THE MILL POWER DRAW, P The mill power draw P is a function of: 1. The fraction of mill filling f L 2. The fraction of the mill critical speed f c 3. The apparent specific gravity of the charge ρand 4. The mill dimensions (diameter D, length L) P = f ( fL, fC ,ρ,D,L)

MoreThe basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed

MoreThe 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

Morefred bond ball mill power draw equations Ball Mill Design/Power Calculation. 20191122 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 Index bulk density

MoreTo determine mill power draw characteristics and capabilities for rod, ball and AG/SAG mills. 3. Mill Power and Charge Level Measurements To determine the actual mill power draw and volumetric load of your mill from plant readings and measurements. 4. Work Index Efficiency To determine the Work Index calculations for evaluating grinding circuit efficiency, as initially developed by Mr. Fred

MoreEquations 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; The factor CF is the correction for non-standard conditions including wet open circuit, wet closed circuit, wet and dry grinding, over size feed and under size grinding. Mill Power Draw. The motor power draw required to turn a mill from rest to the operating speed

MoreBond Ball Mill Calculations Spreadsheet. Excel Sheet For Ball Mill Calculations Ball mill example 1 for non process calculations get price bond ball mill calculations spreadsheet a bond ball mill index test bbmwi is a standard test for determining the ball 8 sep 2014 bond mill throughput free download as excel spreadsheet xls we perform power calculations for maximum power draw for ball mill

More03/10/2003· In total 76 data sets were generated covering the power draws of ball, SAG and AG mills in the range 7 7900 kW. All three models were found to predict the power draw of the mills in the data

MoreThe 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

MoreThe basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed

More21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill dimensions (D and L), when

MoreTo determine mill power draw characteristics and capabilities for rod, ball and AG/SAG mills. 3. Mill Power and Charge Level Measurements To determine the actual mill power draw and volumetric load of your mill from plant readings and measurements. 4. Work Index Efficiency To determine the Work Index calculations for evaluating grinding circuit efficiency, as initially developed by Mr. Fred

MoreEquations 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; The factor CF is the correction for non-standard conditions including wet open circuit, wet closed circuit, wet and dry grinding, over size feed and under size grinding. Mill Power Draw. The motor power draw required to turn a mill from rest to the operating speed

More01/04/2016· If one looks back over the last 70 years or so there is a fairly common theme to most of tumbling mill power draw models (Bond, 1961, Hogg and Fuerstenau, 1972, Arbiter and Harris, 1982, Austin, 1990).This is that the models used the charge shape shown in Fig. 1 in which it was assumed that all particles moved with same rotational rate and that the slurry phase was not explicitly considered.

MoreBond 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 profitability. Mill operators have long used operating work indices to evaluate grinding circuit

More01/01/2016· A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill

MorePresently, power-based equations remain the principal method for designers to size mills and estimate the power requirement for comminution circuits. The technique is simple and it relies on the design to specify a feed and product size plus a hardness index to produce a specific energy value (kWh/t). The desired throughput of the mill is multiplied by the specific energy to give the mill

MoreAdditional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential features of a model for mill power. The torque required to turn the mill is given by Torque T Mcgdc T f (8.9) Where Mc is the total mass of the charge in the mill and

MorePower Draw Of Wet Tumbling Mills And Its Relationship To Charge Dynamics Part 1 A Continuum Approach To Mathematical Modelling Of Mill Power Draw Power Modelling Of Stirred Mills Predicting The Overall Specifcie Energy Requirements Of AG SAG Ball Mill And HPGR Circuits On The Basis Of Small Scale Laboratory Ore Characterisation Tests

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