The Bond rod mill and ball mill work indices are the most similar in size classes, both being fed material crushed to "relatively fine" sizes. Both test are also locked-cycle tumbling …
DetailsThe Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.
DetailsNot a great relationship, R² is less than 1/3. Changing the regression from linear to non-linear options doesn't help much. Drilling down, partitioning the data sources
Detailsby calculating an operating work index where the SEC (E), feed size (F80), and product size (P80) are measured, and the work index (Wi) of the operating industrial circuit is then calculated. The operating work index is useful for performing comparisons of energy efficiency that are corrected for different amounts of size reduction. 2.
DetailsThe crushing work index (CWi), estimated on the basis of the twinpendulum test, has been proposed by Fred Bond and accumulates a long track record in predicting the …
DetailsIt 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 different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills). The relationship between wi and grinding …
DetailsFigure 5 compares the values of the breakage parameter A*b and the impact (crushability) work index, which demonstrates the inverse relationship between them, as expected. …
DetailsCompare and Understand Rod/Ball/Impact-Crushing/Abrasion BOND Work Index. The test determines the Bond Impact Work Index which is used with Bond's Third Theory of …
DetailsThe Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. Adjustable crushing angle Repeatable crushing results Safe two-hand operating buttons The Bond Crushing Work Index (CWI) describes the competency of the ore at …
DetailsThe crushing work index (CWi) is an indicator characterizing the energy amount (kW * h / t) needed to destroy single pieces of material with a relatively large size range (-75 + 50mm). The impact on such material generally is provided by using impact energy (crushing process), that is formed by collision of two oncoming pendulums. ...
DetailsWhat is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: You can read all the details of this now "Biblical" grinding power requirement calculation formula in Fred Bond's original paper. You can also review the step-by-step Bond Work Index Test Procedure I posted here. See this useful summary Table …
DetailsThis 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 …
DetailsThe crushing work index (CWi), estimated on the basis of the twinpendulum test, has been proposed by Fred Bond and accumulates a long track record in predicting the performance of crushing ...
DetailsThis is or was used by to acquire the Impact (AKA Crushing) Work Index for sizing crushers. Use this in complement to the Bond Crushing Work Index Procedure. Another Summary Table of various Impact Work Index by Rock or Mineral Type (/metric tonne). Find a referential Rod Mill Work Index Table here.
DetailsThree Bond work index tests are commonly used in the industry. This essay discusses some observations from SAGMILLING database of published grindability
DetailsThe Bond crushing work index test is an inherently poor test and has been shown time and time again in Round Robin studies to have poor precision (repeatability). Angove and Dunne's paper on the subject gives results that show factors of over 2 in terms of reported work index values from the same sample from different labs.
DetailsThe 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 pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock pieces.
DetailsAlso, values of crushing work index (CWi) increased inversely with the A*b breakage index, as commonly observed (Napier-Munn et al., 1996, Tavares and da Silveira, 2008). Table 4 . Summary of bench scale test results.
DetailsDiferent process conditions or circuits can be compared, even in the case of varying product sizes, by calculating an operating work index where the SEC (E), feed size (F 80), and …
DetailsThe Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and describes the …
DetailsA "raw" work index is an uncorrected work index computed using Eq. (10) based on laboratory results using a non-standard feed (not the −3.35 mm feed prescribed by Bond). A "raw" work index is used in the correction procedure to predict a "corrected" work index that is adjusted to mimic a standard feed.
DetailsThe 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 ...
DetailsThe traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
DetailsComparison of UCS to Bond Work Indices Alex Doll, Alex G Doll Consulting Ltd, Edmonton, Canada Derek Barratt, ... The three rock types do show a mild correlation between crushing Work Index and UCS (R² values between 0.1 and 0.4). Unfortunately, the correlation observed does not make sense: the correlation is expected to be positive ...
DetailsThe Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and describes the competency of the ore at larger particle sizes. The Bond low-energy impact test calculates the actual crusher power requirements. The crushing work index (CWI) is …
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Detailsa tight crushing chamber nip angle and an aggressive crushing stroke to maximise productivity. The accompanying table gives typical outputs for our range of machines, based on dry, free flowing material with a Crushing Work Index of 16 and a bulk density of 1600 kg/cu m (100 lbs/cu ft).
DetailsComparison of the measured Bond work index and the Bond work index estimated from the Hardgrove grindability using the relation (Eq.5) ... crushing, overland transport, blending, and others. View.
DetailsAccording to Fred Bond, "the work index is the comminution parameter which expresses the resistance of the material to crushing and grinding" [1][2][3].
DetailsSeveral tests are normally used to analyze the resistance of rocks and ores to breakage in the mining/aggregate industries. Some of these tests yield results that serve as basis for either simple mathematical expressions or comprehensive models, whereas others are essentially only used to classify a rock or ore in comparison with others. The …
DetailsThe 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. ... F.C., 1961. Crushing and grinding calculation part I and II. Brit. Chem. Eng. 6 (6 and 8). 378–385 & 543–548. ... Sithole, V., 2015. A Comparison of Test …
DetailsPE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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