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Typical Value For Bond Work Index For Limestone
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Table of Bond Work Index by Minerals
Limestone: 13.8: 10.3: 12.7: 14.0: 14.0: 14.0: 9.9: 4-36: 177: Limestone burnt: 11.0: 6-18: 5: Magnesite: 12.3: 11.1: 12.2: 12.5: 12.0: 14.6: 5-25: 18: Manganese ore: 13.5: 12.2: 13.4: 14.0: 13.9: 6-23: 19: Magnetite: 11.0: Malartic: 19.1: Marble: 4.1: …
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A meaningful expression between bond work index, grindability index …
Conversion of this value to operation of the mill for the Bond Work index test results in a value of 194 ∗ 10 −7 kWh/mill revolution. ... This value reflects a medium-high level, similar to that required for grinding an average limestone [29]. Along with the previous statements, appropriate selection of the milling machine will yield a well ...
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Ultimate Bond Strength of Anchors in Rock | Geotechpedia …
These are Basalt, Limestone and Weathered Shale. The typical values of these types of rock materials are summarized in Table 2, below. Table 2: Rock types and geotechnical properties Note: Typical values for unit weight and UCS int / m i are taken from international literature and RocLab software (RocScience), respectively.
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Determination of Bond Work Index of Lucky Cement Limestone Pakistan
A minette-type oolitic iron deposit in the Peace River district, Alberta, occurs as flat-lying ironstone beds up to 10.6 m thick which contain 32-34 wt. % Fe in situ or 36-38 wt. % Fe after drying ...
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The Importance of Work Index in Mineral Processing
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 the Work Index the more work required to crush the rock. This will impact the equipment chosen for your project.
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(PDF) Resistance of Limestone to Size Reduction
The friability values of barite, marble, limestone and bauxite have been determined and compared with the corresponding Bond work index (Wi) and grindability index (G) of these materials.
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The Bond work index of limestone and andesite mixtures
This paper presents the experimental results of the Bond work index values ob- tained by the standard method on limestone and andesite samples, as well as composite samples …
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A new model between the Bond and Hardgrove grindability …
The interrelationships between the Bond grindability (G bg) and the Hardgrove grindabilities (HGI) for three different calcite samples discussed in detail.A very good correlation coefficient was found between the experimental HGI values and the HGI values determined with the new model presented.. There were found to vary significantly …
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bond ball work index of typical minerals
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Limestone grindability in terms of HGI and a new approach …
In this study, limestone samples (a total of 108 sample) were collected from two limestone quarries. The collected samples were initially in the form of palm sized and they were crushed to −2.36 mm. Grinding experiments were conducted in standard HGI (Hardgrove Grindability Index) mill and Ring mill.
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(PDF) Relationship between Bond's work index (Wi) and …
The Bond work index of limestone and andesite mixtures. ... (100) = 1 0.80 = 0.20 and RF(x) = 1. 2.3. Link between grinding kinetics functions and Bond's work index In a Tower mill, the stirring power is almost settled when the mass of balls is definite, but the energy required to grind materials of size F to a definite size P of products ...
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The Bond work index of limestone and andesite mixtures
Table 1 The Bond work index values obtained by standard the Bond procedure and values calculated according to the mass fraction of the sample components Test sieve, Wi, Wi calcul., Difference, Sample µm kWh/t kWh/t % 74 13.90 / / Limestone : andesite 105 12.77 / / 100 : 0 150 12.63 / / 74 14.51 14.95 3.02 Limestone : andesite 105 13.91 13.81 ...
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Using Rock Geomechanical Characteristics to Estimate Bond Work Index
Therefore, this measure can be cheaply determined using other rock characteristics. In addition, the value of the BWi determines the energy required for crushing and milling (depends on the BWi type, e.g., crushing work index, Bond ball mill work index, and Bond rod mill work index), and this measure can be used to optimize …
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Determination of Bond Work Index of Lucky Cement …
the different faces of quarry, Bond work index of limestone Face-4A results less than 20kwh/t, remaining 6 samples are marked as hard rock because of high energy consumption and low grindability rate.
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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES
Typical values of uniaxial strength (in MPa) for nine common rock types (after Johnson and Degraff, 1988). ... (MPa) Compressive Strength (MPa) Limestone Sandstone Sandstone Sandstone Mudstone Limestone Limestone Ironstone Sandstone 18.00 ± 0.62 (20) 19.17 ± 0.21 (23) 23.10 ± 0.48 (19) ... related to the point load index with 50 mm cores ...
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What is the bond work index of limestone?
A bond index is a way of measuring the value of a portion of the bond market. It's computed from the prices of selected bonds, usually a weighted average. Where can find wachovia high yield bond ...
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Prediction of Bond's work index from field measurable rock …
For the evaluation of laboratory and industrial experiments, the work index can be determined as follows: BWI = 44.5 P 1 0.23 × G 0.82 10 P − 10 F where BWI = Bond's work index (kWh/sh. Ton), F = 80% passing size of original feed (μm), P = 80% passing size of circuit product (μm), P1 = Test-sieve size (μm) and G = Net grams of …
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Determination of Bond Work Index of Lucky Cement …
Abstract—The Bond work index is a research methodology, which is widely used for the estimation of power required to grind the materials. Keeping in view the difficulty in determining this index, many alternatives to the standard method have been explored by the different researchers. The study is focused on comminuting behavior of limestone ...
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The Bond work index of limestone and andesite mixtures
This paper presents the experimental results of the Bond work index values obtained by the standard method on limestone and andesite samples, as well as composite samples made up from these ore in different weight ratios. Comparatively are shown the Bond work index values that are obtained by the mass fraction of components that make up the ...
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Bond Impact Crushing Work Index -Procedure and Table of Crushability
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 crushers) or closed-side settings (cone crushers) for a given product size.P80 = 25400 x …
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Bond Work Index
The Bond work index (Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of …
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Limestone grindability in terms of HGI and a new approach …
HGI test results were compared with the PSD results. A new method for the prediction of HGI of limestone samples from both of the quarries (Quarry-1 and Quarry-2) was proposed. Significant correlation (R 2 = 0.84) was obtained with D 90 size parameter. In terms of grinding energy calculations, Bond Work Index (BWI) was taken into …
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A Meaningful Expression between Bond Work Index
The value of the bond work index of the above samples has shown a variation from 10.8 kWh ton 1 for bauxite (high abrasion value and low compressive strength) to 20.4 kWh ton -1 for granite (low ...
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Prediction of Bond's work index from field measurable rock …
Here, 3 models gave almost same R 2 value, but as the previous prediction equations are in the form of linear, here also linear model is considered. The prediction equation is as follows: (26) BWI = 0.34 RHN − 6.61 where, BWI = Bond's work index (kWh/sh. ton), and RHN = Rebound hardness number. Table 12.
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THE BOND WORK INDEX OF LIMESTONE AND …
No. 3-4, 2017 Mining & Metallurgy Engineering Bor24 Figure 2 The limestone content in grinding product during the standard Bond test on samples with the composition limestone : andesite = 50: 50 ...
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The Bond work index of limestone and andesite …
Last Updated: 26 Sep 2023. PDF | On Jan 1, 2017, Dejan Todorović and others published The Bond work index of limestone and andesite mixtures | Find, read and cite all the research you need on...
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(PDF) A Methodology to Estimate Ores Work Index Values …
In this research work, a high grade copper sample from Miduk copper concentrator was prepared, and its work index values were experimentally estimated, using different control screens, 600, 425 ...
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Average Bond Work Index in kJ/kg for some minerals and …
Table 4 shows the Bond work indices for some minerals and industrial materials from [25]. Note that the real circuit mills present work indices greater than those in laboratory tests, …
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THE BOND WORK INDEX OF LIMESTONE AND ANDESITE …
limestone : andesite = 75 : 25. 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, …
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A New Approach to the Calculation of Work Index and the …
The Bond work index is defined as the specific energy required to reduce a particulate material from infinite grain size to a size of 100 microns (Stamboliadis, et al., 2011). Simply put, work ...
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Relationships between Bond's grindability
Firstly, Standard Bond's grindability tests were made for six limestone samples. Result of tests, Bond grindability values of limestone samples were 6.14 g/rev, 2.89 g/rev, 2.58 g/rev, 2.48 g/rev, 2.42 g/rev and 1.54 g/rev, respectively. The standard set of grinding conditions used is shown in Table 2, for a laboratory mill of 6283 cm 3 volume ...
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy
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[PDF] A quick method for Bond work index approximate value …
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 comminution plants designing. Determining the Bond work index value is quite complicated, timeconsuming and requires trained …
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Prediction of Bond's work index from field measurable rock …
Bond's work index (kWh/shTon) Limestone: 1: 2570.17: 201.8: 2.7: 10.924: 2: 2622.42: 187.12: 2.63: 10.556: 3: 2512.08: 167.92: 2.53: 10.203: 4: 2598.83: 178.09: …
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Producer Price Index by Industry: Crushed and Broken Limestone …
Graph and download economic data for Producer Price Index by Industry: Crushed and Broken Limestone Mining: Crushed and Broken Limestone (PCU2123122123120) from Dec 1983 to Feb 2024 about mining, PPI, industry, inflation, price index, indexes, price, and USA.
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Rod Mill Work Index Table
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd . ... Limestone: 13.7: 7-50: 84: Limestone burnt: Magnesite: 15.9: 10-22: 3: Manganese ore: …
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Metals | Free Full-Text | Variability Study of Bond …
It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a variability bysis is carried out with the Bond standard grindability tests on …
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(PDF) Determination of Bond Work Index of Lucky Cement Limestone …
TABLE 3 THE EXPERIMENTED AVERAGE VALUES OF BOND WORK INDEX On the basis of standard procedures, as shown in Figures 14- 15 by increasing the number of grinding cycles with respect to the product size (P80) …
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Testwork: Bond ball mill work index
The work index is used to calculate the energy requirement to grind rocks in the fine size range, below 2.5 mm into the range of a few hundreds of micrometres. Heterogeneous ore types typically are sensitive to the product size of the test, and the work index value changes if the test is performed to a coarser or finer product.
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Bond´s work index estimation using non-standard ball mills
The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index ...