Bond Work Index
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 …
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Effect of core diameter on the Bond impact crushing …
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 …
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Assessing the energy efficiency of a jaw crusher
The final form of Bond's equation can be written as [4]: (2) E = 10 C W i 1 P 80 − 1 F 80 kWh ton where C = a tabulated constant depending on type and condition (wet or dry) of comminution equipment, F 80 = 80% passing sieve size of the feed, μm, P 80 = 80% passing sieve size of the product, μm, W i = Bond work index: the work required to ...
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Rapid ore breakage parameter estimation from a laboratory crushing test
The crushing work index (CWi), estimated on the basis of the twin-pendulum test, has been proposed by Fred Bond and accumulates a long track record in predicting the performance of crushing operations, although with several cases of poor performance. ... As particles fed to the crusher in question were finer than 22.4 ...
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SAG mills selection methods. III. The F. Bond index …
The method selection depends on the crushing/grinding stage (the power size and the necessary finished class). The crushing work index ( CWi) is an indicator characterizing …
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sbm/sbm bond crusher work index pendulum test.md at …
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(PDF) Comparison of measures of rock crushability
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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Bond Grindability Test Procedure
For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P & F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, 34.02 cm x 34.02 cm with following ball charge: Agitator ...
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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. …
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The Ultimate Guide to Pendulum Impact Testing Machines
Pendulum impact testing machines are critical to validating the performance of polymer, composite, and light alloy materials when subjected to an impact. Selecting the …
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Bond Impact Crushing Work Index Tester
The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably …
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BOND TESTING EQUIPMENT
ond crushing work index ( Wi) The ond crushing work index (Wi) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements. The ond impact tester consists of two pendulum mounted hammers. • Pendulum mounted hammer with scale • Sample to be placed on the …
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Impact Crusher Working Principle
Because of this, the pendulum test provides a good estimate of the Net Work Index when this is required for current design procedures. The pendulum product distribution is a breakage function and can be used in models of the process to predict crusher product distributions for different operating conditions.
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Crushing Work Index and UCS
Conclusions. It is not recommended to use UCS as a proxy for the Bond crushing work index, or vice versa. If you insist on doing so, there are several potential regression equations above that you ...
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Comparison of UCS to Bond Work Indices
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. …
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The laboratory test work program was carried out on SAG belt cut and geo-unit samples of two BC copper-porphyry orebodies yielding an exponent of-0.56 across the range of typical ball mill ...
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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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Impact Work Index Procedure
Impact Work Index Procedure. This 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 …
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Bond Work Index Procedure and Method
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 samples in a Ball Mill using a standard ball charge.. Below describes in general terms the Bond Work Index …
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Distribution of impact (crushing) work index for selected …
Based on a large number of tests, Bond introduced a working index or comminution parameter that represents the resistance of the material to crushing and grinding. …
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An Overview Of the SmAll-ScAle teStS AvAilAble tO …
crusher work index (CWI) or impact work index is calculated as follows: The test is generally performed on 20 rocks, which is low. One of the strengths of the test is its …
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Comminution testing
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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A quick method for bond work index …
work index approximate value is exactly the same as in the first two grinding cycles of. the standard Bond test and consists of the program. Prepare a sample, the same as for the standard Bond ...
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How Ball Mill Ore Feed Size Affects Tonnage & Capacity
Hard ore Work Index 16 = 100,000/65,000 = 1.54 kwh/t. ... The phenomena can be studied with the pendulum impact test apparatus. Crusher productivity in quantities of a fixed size distribution is a function of power drawn as opposed to physical machine size. From the results of the pendulum tests, it is possible to visualize a small machine ...
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1 Comparison of measures of rock crushability
The crusher has a feed opening gap of 25 mm, a stroke of 4.9 mm, a cone angle of 44o (in relation to horizontal) and a mantle length of 150 mm. A constant closed-side setting of 7.6 mm was used in ...
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Research on the biaxial compound pendulum jaw crusher …
This paper presents the kinematic and dynamic performance of the new crushers, introduces its structure and layout features, derives the equations involving position, velocity, acceleration and kinetics, describes a workspace of the jaw crusher, analyzes the travel characteristic values and crushing force of movable jaw plates, and …
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A fundamental model of an industrial-scale jaw crusher
The kinematics of the single-toggle crusher has been modelled by Oduori et al. (2015). An energy efficiency study was performed by Legendre and Zevenhoven (2014). In their study, energy was estimated with the Bond work index, and an on-line optimization algorithm was used to increase the efficiency of a laboratory crusher.
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BOND RWi, BWi, CWi, Ai Work Index: What's the …
The three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond crushing (impact) work …
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twin pendulum impact test for testing bond work index
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 from 75 to 50 mm ...
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crusher work tests
The 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. 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.
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