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6 L.M. Tavares & M.A.C.W. da Silveira The Bond work index has also been used, in conjunction with empirical relationships, to estimate capacity factors of jaw, cone and gyratory crushers
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Although 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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The largest size of the Run-of-Mine ore was 1000 mm. The required product size was less than 162 mm.Manufacturer's data indicated that the nearest size of gyratory crusher would be 1370 mm x 1880 mm with a cone angle of 18°. The work index of the ore was 14 kWh/t, the S.G. 4.5 and the coefficient of friction, 0.43. Calculate:
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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 …
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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. M ia values are provided as a standard output from a SMC Test® (Morrell, 2004a) whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test (M
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In estimating the product size and the corresponding specific energy consumption, a number of options exist, although it is not uncommon to solely rely on data provided by crusher manufacturers or ...
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The present work deals with the impact crusher energy efficiency at San Andres Zeolitic Plant. Varying the operational parameters levels (rotor velocity, hammer row number and crusher capacity ...
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GP Series Cone Crushers – Nederland. Over 2200 GP type cone crushers are work-ing around the globe today, which attests to their first-class reliability and versatility.
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The Crusher Work Index in kWh/ton is a function of the material's impact strength and is defined by … an argillite type of rock, which has a work index of 16.5 …bond crushing work index equipment. Read More (PDF) Influence of Natural Aggregate Crushing Process on ...
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The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective grinding length ...
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Mib = Provided by data from the standard Bond ball work index test using the following equation (Morrell, 2006): (6) where. ... (higher) work index than the crusher (ie the ball mill is less ...
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Apa itu Operation Work Index (Wi) ? adalah suatu angka yang menunjukkan karakteristik operasi dari sebuah sirkuit penggilingan dalam hubungannya dengan daya mill yang diberikan dan kemampuan mereduksi ukuran bijih per satuan ton. Mudahnya, operation work index ini mirip dengan bond work index tetapi memiliki subjek yang berbeda. Satuannya pun …
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The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements. Pendulum mounted hammers with scale.-Test: At least 10 …
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The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
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Berry and Bruce (1966) developed a comparative method of determining the hardness of an ore. The method requires the use of a reference ore of known work index. The reference ore is ground for a certain time (T) in a laboratory tumbling mill and an identical weight of the test ore is then ground for the same time.Since the power input to the mill is constant (P), the energy input …
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Download scientific diagram | Distribution of impact (crushing) work index for selected materials measured using the Bond pendulum (symbols: experimental data; lines: log-normal fit). from ...
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The present work compares, for a wide range of materials, a number of measures that have been or have potential use to describe rock crushability for selection and optimization of crushers in...
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Work Index Batu Kapur 10,7 kwh/ton. Work Index Batu Bara 12,5 kwh/ton. 1). Contoh Soal Perhitungan Energi Listrik Pengecilan Ukuran Jaw Crusher, Bahan galian tambang berukuran 160 mm (80% lolos) akan dikecilkan dengan menggunakan sebuah jaw crusher menjadi berukuran 40 mm (80 % lolos). Hitung berapa kwh yang diperlukan untuk peremukan satu ton ...
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Grinding media influence the energy consumption and efficiency of the grinding process during the calculation of the Bond Work index (BWi), a well-known method for selecting comminution equipment, evaluating milling efficiency, and calculating required milling power. Traditional grinding tests often choose steel balls as the grinding media, but ceramic balls are …
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The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson small self-grinding closed-circuit …
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Distribution of impact (crushing) work index for selected materials measured using the Bond pendulum (symbols: experimental data; lines: log-normal fit). …
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The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. ... Some of the data that are collected include the number of visitors, their source, and the pages they visit anonymously. CONSENT: 2 years: YouTube sets this cookie via embedded youtube-videos and registers anonymous ...
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The F. Bond Pendulum crusher Carring on with a theme that we've already touched in the previous publication, we will consider the methodology of the F. Bond index calculating. As you know, there are three calculation methods. The method selection depends on the crushing/grinding stage (the power size and the necessary finished class). The crushing …
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mill work index rather than a ball mill index, because the industrial mill will operate over a coarser size reduction range as measured in the rod mill test, which may exhibit different grindability characteristics than would be observed at the ball mill index range. Table 2 compares the typical range of size reduction observed in grindability
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Crusher Work Index (CWI) kWh/t 10.7 Uniaxial Compressive Strength (UCS) Mpa 103-153 Rod Mill Work Index (RWI) kWh/t 25.0 Bond Work Index (BWI) kWh/t 20.8 Axb 46.7 Abrasion Index (Ai) g 0.464 Ore SG 2.75 Water SG 1.0 The Conventional circuit incorporated a scalping grizzly with a Jaw Crusher (FJ1200), followed by Secondary
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The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. ... continues to be much used for crusher selection. The ...
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Analysis of geometallurgical data is essential to building geometallurgical models that capture physical variability in the orebody and can be used for the optimization of mine planning and the prediction of milling …
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The Bond (impact) crushing work index is given as 27.7 based on a laboratory determination. Use the circuit survey data to compare the operating work index to this laboratory determination. The reported power draws of these MP 1000 …
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Geometallurgical modeling of the production benches is an attempt to estimate the geometallurgical variables of the different ore domains, which leads to a better understanding of the ore and its properties. Having geometallurgical variables results in a more accurate prediction of ore characteristics, an improved drilling and blasting operation, and better efficiency of the …
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= Provided by data from the standard Bond ball work index test using the following equation (Morrell, 2006): ( ) M 80 ( ) 80 0.295 1 80. 80 18. 18 ib f p P Gbp p f. f f (6) ... work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from ...
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For tests performed at SGS laboratories, companion determination of the SPI is the CI (Crusher Index), which should not be confused with a Crushing Work Index. The CI is used as a parameter in determining the feed size of a sample in the CEET2 model, and can be thought of as an "amenability to crushing" index. Higher values indicate finer ...
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The largest size of the Run-of-Mine ore was 1000 mm. The required product size was less than 162 mm. Manufacturer's data indicated that the nearest size of gyratory crusher would be 1370 mm x 1880 mm with a cone angle of 18°. The work index of the ore was 14 kWh/t, the S.G. 4.5 and the coefficient of friction, 0.43. Calculate: 1. 2.
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This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore …
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Rowland, C.A., 1973, "Comparison of work indices calculated from operating data with those from laboratory test data," Proceedings Tenth International Minerals Processing Congress, The Institution of Mining and Metallurgy, London, UK, pp. 47–61. Google Scholar
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Work Index values (crushing, rod mill and ball mill). Data from 11 mines located around the world is ... Figure 1 displays the measured crushing Work Index versus UCS for all mines in the data set. FIGURE 1: BOND CRUSHING WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS, MPa 10 20 30 40 50 WiC (metric)
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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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