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By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
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Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
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Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
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Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
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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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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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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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A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the resistance of the material to crushing and grinding in a rod mill and is used to calculate the grinding power needed for a given material parcel regarding rod mill grinding conditions.
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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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There are two common styles of apparatus in labs, the "bicycle wheel" type as in the picture, and the "pendulum" type. The two should give the same work index results, but they don't. It is known ...
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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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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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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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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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1.1 What is a Pendulum Impact Test. An impact test determines a material's resistance to an impact event. It measures the amount of energy the material absorbs when it is hit by a high-rate load. The most common impact test methods are Charpy and Izod and are typically run using a pendulum impact tester.
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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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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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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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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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twin pendulum impact test for testing bond work index. 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. get price
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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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The Thirty-nine samples were submitted for the Crusher Index (Ci), SAG Power Index (SPI®), Standard Bond Ball Mill Work Index (BWI) and Modified Bond Ball Mill work Index (MBI) tests. The Ci, SPI® and Bond Wi values of these samples show a good indication of ore hardness variability within the ore body.
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. 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 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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Dec 01, 2007· 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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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 …
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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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The Bond low-energy impact test apparatus consists of two pendulum hammers mounted on two bicycle wheels, so as to strike equal blows simultaneously on opposite sides of each rock specimen. The height of the pendulum is raised until the energy is sufficient to break the specimen (Bond, 1947), and then the crusher work index (CWI) or impact
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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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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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machine is used for all initial HPGR lab-scale test work. The pilot-scale crusher is designed to process ore in the identical manner of an industrial unit, as it employs the exact same breaking mechanism. We have determined that the P150 HPGR is the minimum size applicable to provide accurate data for scale-up. Vertical Stirred Mills
DetailsThe present trend is to replace secondary cone crushers by HPGR. The work at Polysius [3] ... (6.14), the material constants are determined by laboratory test work. 6.7.4. Roll speed ... indicated that the Bond work index is not exactly a constant factor for a given ore. Otte [5] reported an increase of W i from 13.9 to 15.6 kWh/t for a …
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The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours ...
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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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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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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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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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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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The purpose of this paper is to conduct the Brazilian test of rock by use of SHPB apparatus driven by the pendulum hammer, in order to test the dynamic indirect tensile strength under the intermediate strain rate ranging from 10 0 to 10 2 s −1.The merit of pendulum hammer-driven SHPB apparatus in generating good incident stress wave, …
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A new test procedure, called the Twin Pendulum Impact Test, which is not part of the autogenous media competency test procedure, has been developed and refined. It gives an accurate method to establish the work index of ore to be crushed in cone crushers and to predict the particle size distribution in the crushing plant product. This …
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PE 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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