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: 17980 kW. Pebble crusher power draw: ... A number of samples were taken from the SAG mill feed belt and subjected ...

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Question: The Bond Work Index Equation is as follows: If the power draw on a ball mill is 2,750 kW, what is the Bond work index for the following charge: Throughput = 950 t h-1 …

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bling mills (AG/SAG, rod, and ball mills) involved in reducing the size of the primary crusher product to that of the final product (usually the cyclone overflow of the last stage of grinding prior to flotation/leach-ing). 2. Feed rate to the circuit (dry tonnes/h) 3. Power draw of the comminution equipment (kW)

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Ball-mill scale up (Bond's Law) Data: zBond work index w i zFeed D fand product dsize (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P= wT, where Tthe mill capacity Mill dimensions (from Tables or charts) 3 Ball-mill scale up Continued Denver method Denver slide rule (circular nomograph) Data (necessary):

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Introduction The Bond ball work indices have for many years been used to determine the design energy required for breakage in full scale ball mills. The measured Bond work index...

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The F.C. Bond Ball Mill is a small universal laboratory mill used in calculating the grindability of all ores. GRINDABILITY IS THE NUMBER OF NET GRAMS OF SCREEN UNDERSIZE PRODUCED PER REVOLUTION. This Ball Mill can be used for units of time (hours, minutes) or it can be used for any number of revolutions, according to the type of …

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a -DEM representation of the Bond Ball Mill with the specified charge of 285 ball of 20,116 g. b -Power profile of the rotating mill, which averages out at 73.7 W for a mill rotating at 70 rpm.

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the form of Equation (3). The Jar Mill test favoured by gives a table of results of E and measured size x for a progressive batch grinding test; these results can be fitted as demonstrated in Figure 4. A series of Bond ball mill work index tests run at different closing mesh sizes can be fitted in almost the same way.

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The grinding-product size, P, in a Bond ball mill, which is given by the aperture size which passes 80% of the grinding product as a function of the aperture size of the test screen Pk, can be expressed by the formula P= P k K 2. These functions for G and P enable us to calculate the value of Wi for any other size of grinding product if we know ...

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A simplified procedure is proposed to calculate the Bond rod mill work index. It accounts for the accelerated breakage rates of coarse particle in the rod mill. It uses about 1/5th of the sample volume when compared to the standard test. It is based on simulation of the test from data collected in batch tests. It predicted the Bond rod...

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There are three power-based methodologies for sizing SAG mills that are widely used: • Bond work index based methods; • Australian "drop weight test" based methods; • The SPI/SAGdesign...

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Abstract The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling.

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This module will introduce you to rod mill, ball mill, and AG/SAG mill power draw. Please note, that this module was originally created for plants with rod and ball mills. Those types of mills are very similar in that the steel media dominate their power draw characteristics. Rod and ball mill power draw calculations are covered in Parts I and II.

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The general form of the equation is by Morgärdshammar that the power draw of a mill is derived from the power required to maintain mill revolutions with the mass of charge acting at the centroid of the mass. This is a form of equation used by many workers with the only variant being the "constant' factor in front of the equation.

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Many power-based grinding models exist, and most operators are familiar with Fred Bond's "third theory". Bond's model is most commonly used to describe primary …

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The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if necessary. The power …

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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 …

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1. Introduction to the Metcom System To know the technical and economic reasons for applying the Metcom System to plant grinding operations. 2. Mill Power Draw To determine mill power draw characteristics and capabilities for rod, ball and AG/SAG mills. 3. Mill Power and Charge Level Measurements

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The model is based on a specific energy-size reduction function, which calculates the particle breakage index, t10, according to the size-specific energy, and then calculates the full product size distribution using the t10 – tn relationships and the mass-size balance approach.

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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 Bond. 5. Functional Performance of Ball Milling To determine ball mill circuit …

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Determining the Bond index using the Fred Bond method [ 1][ 2] is considered the state-of-the-art methodology for mill calculations and a critical process parameter in raw materials selection and grinding process control.

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generate mill energy data to support a measured size-energy relationship for ball mills that would be comparable with the theoretical equations of Morrell (2004 a) and Bond (1959, 1961 a, 1961 b).

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BM Wi (kW-hr/st) = 17.97 BM Wi (kW-hr/mt) = 19.81 Bond Ball Mill

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than 3 inches. A power draw equation was subsequently developed based on dimensional analysis. They applied these models to Taggart's data. The model gave the same trends as observed in Taggarts data but with a fair degree of scatter. 1961/62 Bond Developed a semi-empirical ball mill equation using industrial data (unpublished) and laboratory-based

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The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of...

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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,...

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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, specific density, desired …

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Bond ball Wi kWh/tonne 26 6 JK A*b sg 182 20 4.63 2.45 AG/SAG mill circuits ... Figure 3 – Accuracy of Prediction of AG/SAG Mill and Ball Mill Power Draw (equation 3)

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The Bond rod mill work index ( Wir) is measured using Bond´s standard rod mill grindability test, which is conducted in locked-cycle mode to emulate the continuous closed-circuit operation. Besides the labor-intensive conduct of the test, which typically requires from 5 to 10 cycles for reaching steady-state, it normally requires 8–20 kg of ...

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