bond crusher work index
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- bond crusher work index
It can be written in the following form: Wi = W/ (10/√P – 10√F)………………………………………………………….. (1a) The work index Wi can be determined from plant operations and from laboratory …
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The Bond low-energy impact test calculates the actual crusher power requirements. The crushing work index (CWI) is calculated as follows (Eq. Error! Reference source not found.) [23]: ... Bond work index, as the most important grindability test, has been of interest in many studies in recent years and several equations have been …
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Bond crusher work index 16. 5 kWh/t . Effective Grinding Length, EGL 6.1 m . Bond rod mill work index 19.0 kWh/t . Fraction of crit. speed 0.72 . Bond ball mill work index 17.1 kWh/t .
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The present work deals with the impact crusher energy efficiency at San Andres Zeolitic Plant. ... The Bond work index is one of the most useful and interesting parameters used in designing ...
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A Bond laboratory ball mill work index test was conducted using a closing screen of 150 m which gave a P80 of 108 m. A calculation is required to be carried out to estimate the specific energy ...
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The Bond' Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size. Bond's impact method comes from a double mirrored …
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Bond Work Index Tests. GSL offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills. For more information on the tests please see below: …
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The Bond crushing work index test procedure is not terribly well described, and different laboratories have different procedures that can result in different results (by up to -50% +). ... Recently I was dealing with a crusher vendor and they were also reluctant to rely on the crusher work index results we had from the client side. I ...
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The work index covering grinding in tumbling mills of coarse sizes is labelled M. ia. The work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ...
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The Bond work index (Bond, 1960) ... The gape was 813 mm and the width of hopper 1067 mm. 90% of the ore commenced crushing 200 mm from the bottom of the crusher. The Bond index was estimated as 15 kWh/t. Assuming that the density of the limestone was 2.6 t/m 3, determine 1.
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The Thirty-nine samples were submitted for the Crusher Index (Ci), SAG Power Index (SPI®), Standard Bond Ball Mill Work Index (BWI) and Modified Bond Ball Mill work Index (MBI) tests. The Ci, SPI® and Bond Wi values of these samples show a good indication of ore hardness variability within the ore body.
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The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required …
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The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i – Bond work index (kWh/t); P c – test sieve mesh size (µm);
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An impact pendulum that follows strictly Bond's standard for crushability measurement [5, 32, 33] has been used, which allows calculating the crushing, or impact, work index. The test consists of dropping two pendulum-mounted hammers simultaneously, each weighing 13.6 kg, against individual particles of size ranging from 75 to 50 mm that …
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The Bond work indices (or "impact work index") can be used for estimating the crushability of material and the crusher's energy consumption. The crushability value can be used for estimating the degree of difficulty of the material tested. The dynamic fragmentation value gives an indication of the material's resistance against impact.
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Chapter. Full-text available. Jun 2008. Luis Marcelo Tavares. M A C W Da Silveira. The traditional impact work index (Wi) proposed by Fred Bond over 60 year ago is still used …
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The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. ... Also given are their breakage characteristics as obtained from an impact crusher. The work indexes of ores were 11.8, 13.2, 12.2 and 12.8 ...
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The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory …
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The Work Index is actually the total work input in kwhr/short ton required to reduce from theoretically infinite particle size to 80% passing 100 microns, or to approximately 67% passing 200 mesh. Knowing the …
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Crusher and ball mill power draw were calculated from the Bond equation (Wills, 1992, Bond, 1961): P = 10 · Wi · 1 P 80-1 F 80 where P = power draw per metric tonne (kW h/t); Wi = either the Bond Crusher Work Index or Bond Ball Mill Work Index, as applicable; P 80 = 80% passing size in the product (in microns); F 80 = 80% passing size …
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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.
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values of work index for different materials, see Table 25.3.2.4. An example of the use of the formula follows. Example 25.3.1.1. Assume a copper ore with Bond crusher work index of 14.2. The design feed rate is 1800 t/h (2000 tph). An Allis Chalmers 5474 crusher is selected with an open-side setting of 165 mm (6-1/2 in.). Solution.
به خواندن ادامه دهیدAlthough not as popular as the Bond ball mill or the Bond rod mill work indices, the impact work index, also called Bond crushability index, continues to be much used for crusher selection. The ...
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Bond Crusher Work Index; Bond Abrasion Work Index; Bond Ball/Rod Mill Indices; J-K Drop Weight Test* SMC Test®* Starkey SAG Design Test* Starkey SAG Variability Test (SVT)* Unconfined Compressive Strength (UCS) HPGR; VXP *Licensed to conduct this test work at our facility, data is interpreted and results reported by the parent company.
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Characterization of rocks for selection of crusher can be done in different ways, and the most commonly used is Bond work index (Tavares and Carvalho 2007). Holmes (1957) proposed a modification ...
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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 mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …
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FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. …
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13. Limestone. 16. Gold Ores. The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index. Remember, the higher …
به خواندن ادامه دهید* 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 …
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