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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 consideration ...
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Bond Work Index Report Matrix House
Work index of 14.6 kWh/t, from the Bond Ball Mill is indicative of a hard ore. The hardness indexes are defined as follows: Property Soft Medium Hard Very Hard Bond WI (kWh/t) 7 - 9 9 - 14 14 - 20 > 20 . 5. Appendix . Particle Size Analysis used for the Bond Ball Mill calculations: Feed Particle Size Analysis: ...
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Bond Work Index
The Bond work index value changes with the sieve size chosen during a particular test. For example, instead of choosing the screen size through which 80% of the ore passes, the …
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Bond Impact Crushing Work Index -Procedure and Table of Crushability
Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented …
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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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The Bond work index of limestone and andesite mixtures
DOI: 10.5937/MMEB1704021T Corpus ID: 55235386; The Bond work index of limestone and andesite mixtures @article{Todorovi2017TheBW, title={The Bond work index of limestone and andesite mixtures}, author={Dejan Todorovi{'c} and Zoran Bartulovi{'c} and Vladimir Jovanovi{'c} and Branislav Ivo{vs}evi{'c}}, journal={Mining and Metallurgy Engineering Bor}, year={2017}, …
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The bond work index of mixtures of ceramic raw materials
The work indices of the ternary mixtures were increased gradually from 12.70%, and 18.24% to 24.31% by a significant amount with respect to the calculated work index values when kaolin was added ...
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A meaningful expression between bond work index, …
Friability of rocks and ores can be determined by brittleness tests. A test apparatus to determine friability value has been designed to suit limestone strength characteristics used in cement production.The friability values of barite, marble, limestone and bauxite have been determined and compared with the corresponding Bond work index (W i) and grindability …
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A new approach to Bond grindability and work index: …
The Bond work index is widely used to estimate the power required to grind materials. Because of the difficulty in determination of this index, alternatives to the standard …
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Relationships between Bond's grindability
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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Determination of work index in a common laboratory mill …
An analysis of the results shows a direct relationship between the Bond work index and the Denver work index when the Bond test is defined adequately to the Denver lab mill. Comparison of results ...
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users are often not aware of the nuances of the work index family: what are its strengths and weaknesses.
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(PDF) Relationship between Bond's work index (Wi) and …
Fig. 4. A test result of a limestone sample on KM-5 Tower mill. 85 S. Nitta et al. / Int. J. Miner. Process. 66 (2002) 79–87 3. Validation of the relationship between Wi and n through experiment 3.1. Measurement of the Bond's work index Wi In Japan, the Bond's work index (Wi) measurement abides, basically, by the JIS M-4002 regulations.
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Determination of work index in a common laboratory …
Bond work index determination: ... Limestone 2,131 156 200 3.0650 8.99 ... (Bond, 1952). Figure 3 — Work index values calculated with both mills for different minerals.
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...
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limestone bond work index
bond work sindex value for limestone - em-hoveniers.nl. 30-11-2020· 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, 105 and 150 microns.
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(PDF) Determination of Bond Work Index of Lucky Cement Limestone …
The value of 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 abrasion value and high modulus of elasticity). ... Bond work index of limestone Face-4A results less than 20kwh/t, remaining 6 samples are marked as hard ...
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Hargdrove Grindability Index (HGI) and calculated …
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 grinding power.
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A procedure for rapid determination of the Bond work index
Kapur (1970) analyzed the batch-grinding cycles involved in Bond grinda- bility tests and then developed a mathematical algorithm for "stage-wise" sim- ulation of this test and an assessment of the Bond work index. Magdalinovid and Cumpujerovid (1983) have shown that an approximate value of the work index can be determined by just one grinding ...
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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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THE BOND WORK INDEX OF LIMESTONE AND …
No. 3-4, 2017 Mining & Metallurgy Engineering Bor25 Figure 4 The limestone content in circulating load during the standard Bond test on samples with the composition limestone : andesite = 25: 75 ...
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The Bond work index of limestone and andesite …
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.
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MINE 331
The bond work index of granite is expected to be the highest due to the ore being mostly composed of the hard mineral quartz. Bond Work index values of granite presented in literature range from around 14-15. Limestone is theorized to have a Bond Work index with a value of around 11. This is due to the main presence of calcite, a softer mineral.
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A new approach to Bond grindability and work index: dynamic …
The general characteristic of all these methods is the need for either a Bond mill or a standard laboratory mill. A different, non-standard method for determining the Bond work index was presented using an experimental relationship between the Bond work index and the mechanical and elastic properties of the material (Yap et al., 1982). They ...
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THE BOND WORK INDEX OF LIMESTONE AND ANDESITE …
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 made up …
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(PDF) Alternative Approaches for Determination …
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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Bond Crushing Law and Work Index Calculator …
Example Problem on Bonds Crushing Law and Work Index. What is the power required to crush 100 ton/h of limestone if 80 percent of the feed passes a 2-in. screen and 80 percent of the product a -in. screen. work index for limestone is 12.74? Given: Mass flow rate ((m)) = 100 ton/h ; Initial particle size ((D_{text{feed}})) = 2 inches = 50.8 mm
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Determination of Bond Work Index of Lucky Cement Limestone …
Determination of Bond Work Index of Lucky Cement Limestone Pakistan - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Scribd is the world's largest social reading and publishing site.
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Prediction of Bond's work index from field measurable rock …
Swain and Rao (2009) used Hardgrove index and friability value (S 1) to establish correlation with BWI of partially kaolinised khondalite (A Bauxite mine waste) and found the following correlations with correlation coefficient of 0.9348 and 0.9944 respectively: BWI = − 18.193 ln S 1 + 66.747 BWI H = 0.9982 BWI where, BWI = Bond's work index ...
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