What is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: You can read all the details of this now “Biblical” grinding power requirement calculation formula in Fred Bond’s original paper. You can also review the step-by-step Bond Work Index Test Procedure I posted here. See this useful summary Table of Bond Work Index by Minerals. For any circuit ...

The ability to simulate the Bond work index test also allows examination of trun ed 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 ...

In grinding, operating Efficiency compares the operating work index of a comminution machine to the Bond work index from bench scale crushing and grindability tests or/and pilot plant tests. Economic Efficiency is comparing the income from production to the planned income from production. Energy as consumed in comminution machines and the required energy as determined, from bench scale ...

Bond Grinding Circuit Efficiency Meeting of Bond Efficiency Guideline Working Group of the Global Mining and Standards Group Salt lake City, 2014 Based on Presentation to the 2008 Meeting of SME, by C.A. Rowland, Jr. and R.E. McIvor. Bond Grinding Circuit Efficiency The Bond Work Index equation Ore test WI Circuit operating WI

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grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82 10 𝑃80 −10 𝐹80 1 where W i – Bond work index kWh/t P c – test sieve mesh size µm G – weight of the test sieve fresh undersize per mill revolution g/rev F 80 – sieve mesh size passing 80% of the feed before ...

Where, WioACTis the Actual Operating Bond Work Index kWh/t , W is the specific energy input kWh/t , P80 is the 80% passing size of product µm , and F80 is the 80% passing size of circuit feed µm . 2. Calculate the Standard Circuit Bond Work Index WiSTD for the material being processed equation 3 . Wtotal

Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m to a rod µ mill circuit product size of 1,000 µm. W1 = 9.5 x 10 / 1,000 – 10 / 19,300 = 2.32 kWh/t

The Bond& 39;s standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work ...

To participate in the 911Metallurgist Forums, be sure to JOIN and LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion most frequent . Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else’s ...

Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m to a rod µ mill circuit product size of 1,000 µm. W1 = 9.5 x 10 / 1,000 – 10 / 19,300 = 2.32 kWh/t

To participate in the 911Metallurgist Forums, be sure to JOIN and LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion most frequent . Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else’s ...

grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82 10 𝑃80 −10 𝐹80 1 where W i – Bond work index kWh/t P c – test sieve mesh size µm G – weight of the test sieve fresh undersize per mill revolution g/rev F 80 – sieve mesh size passing 80% of the feed before ...

In practice, it is possible to find materials of non-standard size that are finer than 3.327 mm.In this work, a procedure for the calculation of the Bond work index is suggested for cases when the ...

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 profitability.

The Bond& 39;s standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work ...

How to Calculate Grinding Mill Operating Efficiency. 2018/04/15· For operating efficiency calculations, it is necessary that the efficiency factors are applied so that both work indices, used in the comparison, are on the same basis.

Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch 6350 microns .

This energy efficiency calculator is a simple tool for calculating the ratio of useful energy output to the energy input. You can use it for determining the proportions of heat energy, electric power, mechanical work, or even chemical energy.

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 profitability. Mill operators have long used operating

In practice, it is possible to find materials of non-standard size that are finer than 3.327 mm.In this work, a procedure for the calculation of the Bond work index is suggested for cases when the ...

The mill power is = 22.5 Watts, calculated by 6 . Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power. After time the mill product is t

The Bond& 39;s standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work ...

* Bond F. C., “Crushing Tests by Pressure and Impact”, Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied.

Wi is the work index, unitless, but applicable only to metric calculations; F80 is the 80% passing size of the feed, µm; P80 is the 80% passing size of the product, µm. The work index laboratory measurement can be made with a variety of equipment. The most common is the Bond ball mill work index:

How to Calculate Grinding Mill Operating Efficiency. 2018/04/15· For operating efficiency calculations, it is necessary that the efficiency factors are applied so that both work indices, used in the comparison, are on the same basis.

Calculation of energy required for grinding in a ball mill. Int. J. Miner. Process., 25: 41-46. The Bond work index, Wi, as an indi or of the grindability of materials is not a material constant but rather it changes with change of size of the grinding product.

Bond Work Index and Drop Weight Tests are more re sample, resources and time. However, the PLI value Is 50 in MPa can be correlated to the Drop Weight test parameters A and b and the Bond Work Index BW i . The Drop Weight and Bond Work Index parameters are required to model the crushing and grinding circuits. Therefore, the use of the

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.

This energy efficiency calculator is a simple tool for calculating the ratio of useful energy output to the energy input. You can use it for determining the proportions of heat energy, electric power, mechanical work, or even chemical energy.

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.

The mill power is = 22.5 Watts, calculated by 6 . Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power. After time the mill product is t

The Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index BWI is used for the range from 2.1 mm down to 100 µm. Adjustment of grinding parameters:

= fine ore work index kWh/tonne P. 1 = closing screen size in microns . Gbp = net grams of screen undersize per mill revolution . p. 80 = 80% passing size of the product in microns . f 80 = 80% passing size of the feed in microns . Note that the Bond ball work index test should be carried out with a closing screen size

Ball Mill Sizing With Bond Method Work Inde Base. Ball Mill Sizing With Bond Method Work Index Base. 1. introduction. a bond ball mill work index test is a standard test for determining the ball mill work index of a sample of ore. it was developed by fred bond in 1952 and modified in 1961 jkmrc co., 2006.this index is widely used in the mineral industry for comparing the resistance of ...

Bond Work Index and Drop Weight Tests are more re sample, resources and time. However, the PLI value Is 50 in MPa can be correlated to the Drop Weight test parameters A and b and the Bond Work Index BW i . The Drop Weight and Bond Work Index parameters are required to model the crushing and grinding circuits. Therefore, the use of the

This energy efficiency calculator is a simple tool for calculating the ratio of useful energy output to the energy input. You can use it for determining the proportions of heat energy, electric power, mechanical work, or even chemical energy.

A New Approach to the Calculation of Work Index and the . The mill power is = 22.5 Watts calculated by 6 . Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power.

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.

The Bond& 39;s work index values increased as test sieve size decreased. 16. Bond work index is changed with the change in the test sieve size and circulating load. This must be taken into account when energy consumption is calculated according to the Bond formula. unit energy cost extra increased as circulating load decreased from 250%.

Crushing mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model. The work index is used to calculate the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm - 20 mm.

Standard size ranges and the related Bond work indexes Feed size F 80, μm Product size P 80, μm Work index 100000 10000 crushing CWI 10000 2100 rod milling RWI 2100 100 ball milling BWI Fig. 1. Laboratory equipment used by RIVS for determining the Bond work indexes: a CWI; b RWI; c BWI а b c

laboratory work index of the ball mill feed, the standard Bond ball mill was implemented. To estimate/predict the amount of consumed energy, and SAG mill feed hardness, Bond equation or Bond’s laboratory work index cannot be used, thus a Starkey mill was used to measure SAG mill power index 5 . To determine efficiency of mills and size

The standard Bond Ball Mill Work Index test procedure is firstly to stage crush the feed to minus 3.35mm, and size a representative sample. The test then involves a series of batch grinds in a standard Bond mill. A Bond mill is 0.305m by 0.305m, with rounded corners, a smooth lining, and runs at 70rpm. The charge consists of 285 balls, weighing a

of the Bond ball mill grindability test. For all model based methods, a reliable method to calculate mill power draw for a given mill is required for the calculation of power draw. Morrell 1996 proposed a mathematical model for autogenous, semi-autogenous and ball mills which is based on the motion of grinding charge inside the mill. He also ...

Besides, the results of work index tests are accordingly implemented in Equation 5 to calculate the ore work index values. Equation 5 is similar to Bond work index equation, but it has been defined for the foregoing calibrated bond ball mill 15 . P F P G Wi i i 10 10 11.76 1 1 230. 75 u u 5 Where, W i =Bond laboratory ball work index

3.2.1. Effect of circulating load on Bond& 39;s work index Figures 1-3 shown variation in the Bond work index with circulating load. It has been found thai the calculated work index is increased with lower circulating loads for each test sieve size. Otherwise, effect on the Bond work index is mostly for the finer test sieve size 63 micron . OS ş ...

ball mill work index calculation xls. Bond Work Indexan overview ScienceDirect Topics. The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 3.36 mm 6 mesh to product size in the range of 45-150 µm 325-100 mesh thus determining the ball mill work index Wi B or BWi .

Calculation of energy required for grinding in a ball,A bond ball mill work index is then performed on the mill product for the design of sagball mill circuits this is important because it was found that there was a 115 kwht higher ball mill work index if the 335 mm ball mill test feed size is moret.get price

OEE is a closed-loop metric measuring the 3 critical manufacturing components of Availability, Performance and Quality. Your OEE score is presented as a %. See below 2 methods to calculate your OEE % Top Line OEE calculation and APQ OEE calculation .

The work index . W. i. was defined by F. Bond as the specific energy kWh/ton required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x ..

Crushing mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model. The work index is used to calculate the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm - 20 mm.

Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Test

This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno. If you have any questions, need adv...

laboratory work index of the ball mill feed, the standard Bond ball mill was implemented. To estimate/predict the amount of consumed energy, and SAG mill feed hardness, Bond equation or Bond’s laboratory work index cannot be used, thus a Starkey mill was used to measure SAG mill power index 5 . To determine efficiency of mills and size

rod mill work index has not been de ned as yet. The ball ﬁ mill work index is con rmed at 16 kWh/t. The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency. This raises the point that, in some cases, the Bond EF4 oversize factor calculation is

Bond Efficiency Slides - Global Mining Standards. Feb 20, 2014 ... The Bond Work Index equation. Ore test ... Wet, closed circuit ball milling to final P80 ... Example SAG-Ball Mill Circuit WI Efficiency Calculation. Get Price

= SAG mill feed sample mass, grams The ball mill pinion energy is determined from the Bond the Third Theory of Comminution : S d-BWI = 1.102 * 44.5 / P cs 0.23 G pb 0.82 / 10 / P 80 1/2 – 10 / F 80 1/2 where : S d-BWI = Bond ball mill work index on SAG ground ore, kWh/ton ground F 80 = 80% passing of SAG ground of the test feed size ...

Bond work index is changed with the change in the test sieve size and circulating load. This must be taken into account when energy consumption is calculated according to the Bond formula. unit energy cost extra increased as circulating load decreased from 250%. However, unit energy cost decreased as circulating most suitable circulating load for amorphous silica used experiments is 250% ...

This energy efficiency calculator is a simple tool for calculating the ratio of useful energy output to the energy input. You can use it for determining the proportions of heat energy, electric power, mechanical work, or even chemical energy. Continue reading to learn how to calculate efficiency in each of these cases and discover what the real-life appli ions of the efficiency formula are.

Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the

Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Test

1 Introduction Finding the bond work index of an ore type is crucial to determining the grinding energy required during comminution in a ball mill. The bond work index is a constant characteristic related to the hardness of a specific ore type. Bond work index is one of three different approaches that can be used to calculate the work index of ...

Mill orcircuit performance,particularlyontheWrtwatersrand,isoftenindi edbytheindex kilowatt urs pertonneofminus 75 J.II11material produced kWM minus75 J6fI orO 75 & 39;Thepaper shows that a standard kWM minus 75J.II11index SE canbeobtained from the standard Bond grindability test which prOllides

Bond Work Index Ball Mill Calculation Design And Safety The grinding jar for the bond index rod mill is 12 x 24 in size and has a waveshaped design at least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill the rod mill work index rwi is used for particle size determination in a size range from 25 mm down to 21 mm whereas ball mill work.

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 recovery was in the order of 50–60%. Furthermore it may be

Bond Work Index 𝑤 = 10𝑊𝑖 1 𝑝 − 1 𝑓 W = Power required in KWH to crush 1 short tonne 2000 pound of material Wi is the work index of the material p is the 80 % passing size of the product f is the 80 % passing size of the feed 2/25/2015 6:58:05 AM 23 24.

The geometry of a mill with conical ends is shown in Figure 8.6. The total volume inside the mill is given by Vm 4 D2 mL 1 2 Lc L L 1 Dt/Dm 3 1 Dt/Dm 8.16 The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill, or large lumps of ore in an

Operator efficiency can be expressed in more specific ways, like ‘On-Standard Efficiency’ instead ‘over-all efficiency’. An operator may be attending all hours in a shift but if he has not been given on-standard work to do in all hours, he will not be able to produce minutes as per his capability and skill level. In this case, to know operator’s on-standard efficiency following ...

This energy efficiency calculator is a simple tool for calculating the ratio of useful energy output to the energy input. You can use it for determining the proportions of heat energy, electric power, mechanical work, or even chemical energy. Continue reading to learn how to calculate efficiency in each of these cases and discover what the real-life appli ions of the efficiency formula are.

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