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efficiency of grinding process. In this investigation, some Saudi samples from bauxite, kaolinite, granodiorite, magnetite, granite, feldspar and quartz were tested for hardness, abrasion, compressive strength and modulus of elasticity,, and the work index is estimated. 2.1 Hardness Test Th e Rockwell test measures hardness by using diamond cone indenter. The indentation is measured after a

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Calculation Of Grinding Efficiency Of Machines. calculation of grinding efficiency of machinesGrinding efficiency of ball mill calculating equation bond equation of cement ball mill sizing the method is used to size a cement ball mill efficiency correction factors are applied with the bond equation the method is valid both for clinker grinding and for ball mill equipment equationsmx ball

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The work index Wi 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 e1,2=C.(1/x2n1/x1n ), which for n = 0.5, x1 = ∞ and x2 =100, by definition gives e∞, 100 = Wi and consequently C=10Wi. In theory, for a given material the value found for Wi

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A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant. Where possible it is carried out on a 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 . Chat Online; bond method for ball mill work index

Get Price### A New Approach to the Calculation of Work Index and

The work index Wi 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 e1,2=C.(1/x2n1/x1n ), which for n = 0.5, x1 = ∞ and x2 =100, by definition gives e∞, 100 = Wi and consequently C=10Wi. In theory, for a given material the value found for Wi

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Ball Mill Design/Power Calculation. 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 mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and

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A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (e.g., via a hand crank), working animal (e.g., horse mill), wind or water ().

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Bond Work Index (KWh/t) C s % Per cent of critical engine speed (%) S (g/cm³) SSpecific weight of the grinding stoc (g/cm³) D. m. Inner diameter of the mill (m) K. Proportionality constant . 350 for wet milling 335 for dry milling. Download Datasheet Grinding Media Formular after Bond; print; Result. Formula. Value after bond. corrected value (+30%)* B balls diameter in (mm) C Cylpebs

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The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.

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Furthermore the type of mechanical stress applied in a certain crusher or mill type, i.e entire breakage distribution function needs to be constructed based on experimental test work or sampling and back-calculation from continuous comminution tests at an even larger scale [5]. In this context, it must be noted that a methodology that both comprises size reduction and energy for size

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Hardgrove Grindability Calculation 2016. From a study of large number of determined values of Hardgrove Grindability Index HGI of all major types of Indian coals in has been found that HGI of coals is mainly dependent on two factors i rank of the coal and ii the amount of ash in it It has been established that volatile matter together with the moisture of coals both reported at 60 R H and at

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by the Bond laboratory test using the following equation ( ) (( ) ) 80 ( ) 80 0. 295 1 80. 80 18. 18 ib f p P Gbp p f. f f M (1) where . M. ib = 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%

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31.07.2014 · Wm = Wi ( 80P 10 80F 10 ) (1) where Wm is mill specific motor output power (kWh/t), Wi is the Bond ball mill work index (kWh/t), P80 is sieve size passing 80% of the mill product (µm), F80 is sieve size passing 80% of the mill feed (µm), The "efficiency factors" (Rowland, 1975) modify equation 1 so that it caters for circuit conditions which are different from that Bond used

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Bond formula for the grinding balls size calculation. October 19, 2017 · Archive · 0 . The enterprises consumers grinding media have a question about right choise the grinding ball size (diameter) for the mill in order to achieve the required grinding quality. We noted earlier, this information can be obtained from several sources Technical documentation. It attached to the milling

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Bond formula for the grinding balls size calculation. October 19, 2017 · Archive · 0 . The enterprises consumers grinding media have a question about right choise the grinding ball size (diameter) for the mill in order to achieve the required grinding quality. We noted earlier, this information can be obtained from several sources Technical documentation. It attached to the milling

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crushing efficiency calculation equation Hot-sale, Home>Mining Question>Crushing>crushing efficiency formula crushing efficiency formula jaw crusher crushing efficiency mine-equipments Jun 16, 2014 iron ore crushing energy efficient mill equipment,Crusher plant,jaw crushing efficiency calculation equation- 19 Aug 2013 Mining Read More

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Bond ball mill work index; Bond rod mill work index; Bond crushing (low-energy impact) work index ; Required parameters. F 80, µm is the 80% passing size of the fresh feed to the circuit (expected to be a Bond-compatible size distribution). P 80, µm is the 80% passing size of the circuit product (expected to be a Bond-compatible size distribution). Availability, expressed as a decimal (0.90

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Ball Mill Design/Power Calculation. 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 mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and

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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

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Ball Mill Design/Power Calculation. 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 mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and

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A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed. When a JK Drop Weight Test is also being

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25.02.2015 · 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 65805 AM 23 24. Rosin Rammler Distribution 𝐹 𝑑 = 100 1 − 𝑒 −𝑑/𝐷 𝑚 F(d) is the cumulative percent of material

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assumed feed passing size varied from 5mm to 25mm. The work index, WI used was 14kWh/t for the CFRP according to the Typical Bond Index value. For each test, the power draw is determined by the calculation software designed by the Smart Dog Mining Company who developed the software from information gathered over 40 years in the mining industry.

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31.07.2014 · Wm = Wi ( 80P 10 80F 10 ) (1) where Wm is mill specific motor output power (kWh/t), Wi is the Bond ball mill work index (kWh/t), P80 is sieve size passing 80% of the mill product (µm), F80 is sieve size passing 80% of the mill feed (µm), The "efficiency factors" (Rowland, 1975) modify equation 1 so that it caters for circuit conditions which are different from that Bond used

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Beneficio ball mill design calculation xls Ball Mill Design Power Calculation Ball Mill Power Design Calculation Example 2 In Example it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 guess what mineral type it is from 80 passing inch to 80 passing 100 mesh . READ MORE . Ball Mill Sizing Calculations Spreadsheet

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31.07.2014 · Wm = Wi ( 80P 10 80F 10 ) (1) where Wm is mill specific motor output power (kWh/t), Wi is the Bond ball mill work index (kWh/t), P80 is sieve size passing 80% of the mill product (µm), F80 is sieve size passing 80% of the mill feed (µm), The "efficiency factors" (Rowland, 1975) modify equation 1 so that it caters for circuit conditions which are different from that Bond used

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Figure 8.3 Simplified calculation of the torque required to turn a mill. RI FULWLFDO VSHHG 3RZHU Figure 8.4 The effect of mill speed on the power drawn by a rotating mill. The liner profile and the stickiness of the pulp in the mill can have a significant effect on the actual critical velocity. Mills usually operate in the range 65 82% of critical but values as high as 90% are sometimes used

Get Price### Operating work index is not the specific energy

24.10.2018 · The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) (efficiency is given on your motor name-plate), and allow for any

Get Price### Operating work index is not the specific energy

24.10.2018 · The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) (efficiency is given on your motor name-plate), and allow for any

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