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Bond Work Index Tests | GSL
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at …
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Comparison of Ore Hardness Measurements for Grinding Mill …
• Bond Impact Crushing Work Index • Specific Gravity Advanced Terra Testing, Inc. (ATT) • Unconfined Compressive Strength ASTM D 5731 • Specific Gravity, ASTM D 854 . Dawson Metallurgical Laboratories, Inc. • SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore)
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Impact work index prediction from continuum damage model of …
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 …
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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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A quick method for bond work index approximate value determination
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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Crushing work index Calculation
The Bond crushing work index test (sometimes called the "impact work index" test) is noisy, and the difference you observed is perfectly reasonable. The paper by Angove & …
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Bond Tests | SGS Canada
* 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 applied.
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A public Database of tumbling mill grindability measurements …
The `wic` (crushing work index or low energy impact work index) table includes the following fields: • # Specimens – The quantity of specimens tested for a particular sample. • WiC – The mean crushing work index of a set of specimens, metric units. • WiC Min – The minimum crushing work index of a set of specimens, metric units.
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Bond Impact Crushing Work Index -Procedure and Table of …
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 …
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AMIT 135: Lesson 5 Crushing – Mining Mill Operator Training
Define terminologies involved in crushing operation; Explain how crushing works; Explain the stages involved in crushing operation (Primary, Secondary and Tertiary) ... (CSS) varies depending on the jaw profile that is being used and has an impact on the crusher's capacity and product gradation. Diagram of closed ... Work Index (kWh/t) 1219 x ...
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A New Approach to the Calculation of Work Index and the …
The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. ... Impact crushing approach to the ...
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Table of Bond Work Index by Minerals
This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1. Source 2. Source 3. Source 3. Source 4.
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Size Reduction and Energy Requirement
The impact crushing strength of rocks so determined is used to calculate the Bond crushing work index using the expression (3.9) W i = C × I R e l a t i v e d e n s i t y o f s a m p l e kWh / t where. C = a constant which converts the impact crushing strength, numerically and dimensionally to the work index
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Impact work index prediction from continuum damage model of …
An impact pendulum that follows strictly Bond's standard for crushability measurement (Bond, 1947, Bergstrom, 1985, Tavares, 2007) has been used, which allows calculating the crushing, or impact, work index.The test consists of dropping two pendulum-mounted hammers simultaneously against individual particles of size ranging …
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Designing an optimal comminution sampling program for …
• The Bond impact crushing work index on coarse (+100 mm to -150 mm) specimens. • Any two of the following on a representative sub-sample of material crushed to a medium size class (approx -30 mm); pick the tests that correspond to the models you intend to …
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Bond Work Index
Bond impact crushability work index (CWi) (Bond, 1963) results reported for iron ores vary from hard iron ore (17.7 kWh/t) to medium hardness iron ore (11.3 kWh/t) and friable …
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Relationship between A*b and Bond impact work index for the …
The 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 ...
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Effect of core diameter on the Bond impact crushing work …
energy impact work index (a.k.a. crushing work index) is conducted only on coarse specimens placed one at a time in the testing apparatus. With respect to the crushing work index test, F.C. Bond (1946) specifies that "In the standard method of testing only broken pieces that pass a 3-in. square opening and are retained
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Crushing in Mineral Processing
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 pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock pieces.
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Bond Impact Crushing Work Index Tester
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. …
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Using Rock Geomechanical Characteristics to Estimate Bond …
The Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and …
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Simulating breakage tests using the discrete element method with
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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Comminution Testing Services
Crusher Work Index Tests – Used to calculate power requirements, and size crushing equipment. SMC Test – Used to determine energy requirements for a wide variety of comminution equipment. JK Drop Weight test – Used to predict crusher and AG/SAG mill performance. 911 Metallurgy will provide your with the comminution services you need to ...
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Impact work index prediction from continuum damage model of …
The Bond crushing work index is a measure of material strength and is determined using a simple twin pendulum apparatus and a standard procedure. The Bond impact test attempts to emulate the crushing action that occurs inside the chamber of jaw, cone and gyratory crushers, where particles may not be broken in the first nipping cycle, …
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Crushing Work Index and UCS
Introduction. There are few metrics of ore comminution hardness at coarse sizes, so it is reasonable to ask what sorts of relationships exist with geotechnical metrics such as the Unconfined (or ...
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(PDF) EFFECT OF CORE DIAMETER ON THE BOND IMPACT CRUSHING WORK INDEX
The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core, frequently used in ...
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Solved 1. Bond's formula is a useful tool when comparing
In crushing energy calculations, a crushability index (impact work index) as determined by laboratory tests is used. Now consider a certain material being crushed in two different size ranges, a coarse crushing range and a fine crushing range, for the same reduction ratio of about 4:1. a. Compare the energy input required for the two cases ...
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Understanding comminution: Compression versus impact crushing
As a kind of basic first rule you could say: Impact crushing is suitable for rocks with a low work index (<12) as well as low silica (<20%) and moisture levels (<5%). Rocks with these characteristics are soft and non-abrasive material, which can be broken easily within the crushing chamber while keeping wear rates at a minimum and produce high ...
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Bond Work Index Tests | GSL
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at which a specimen fails and allows approximation of net power requirements for sizing crushers. The open and closed sized settings for given product sizes can also be …
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SAGMILLING .:. Articles
Effect of core diameter on the Bond impact crushing work index test The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter.
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