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Bond pendulum test, ... The work index is then calculated from the statistical power relation: (3.54) W i = a + b x 1 + c x 2 + d x 1 2 + e x 2 2 + f x 1 x 2 where x 1 is the size parameter, ... Also given are their breakage characteristics as obtained from an impact crusher. The work indexes of ores were 11.8, 13.2, 12.2 and 12.8 kWh/t. ...
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The eccentric throw is one of the most important parameters in defining the job that your cone crusher does. The mantle in a cone crusher spins in conical pendulum motion. That means it doesn't stay in the center of the chamber – it sweeps around moving closer and further away from the concave. This is what creates the crushing action. At a ...
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Bond impact pendulum. An impact pendulum that follows strictly Bond's standard for crushability measurement (Bond, 1947, Bergstrom, 1985, Tavares, 2007) …
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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 …
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bond crusher work index pendulum test. 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 openside settings (jaw crushers and gyratory crushers) or closedside settings (cone crushers) for a …
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The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index ...
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Traditional compound pendulum jaw crushers have many disadvantages such as low efficiency and uneven broken materials. This paper proposes a new biaxial compound pendulum jaw crusher to solve these problems.
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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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The Crusher Work Index in kWh/ton is a function of the material's impact strength and is defined by … an argillite type of rock, which has a work index of 16.5 …bond crushing work index equipment. ... The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition ...
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Compare and Understand Rod/Ball/Impact-Crushing/Abrasion BOND Work Index. The test determines the Bond …
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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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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.
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work indices from Bond ball mill grindability tests; abrasion index; Four of the eight circuits, namely figures 7, 8, 9a and 9b, involve the use of cone crusher to produce either rod mill or single stage ball mill feed. A new test procedure, called the Twin Pendulum Impact Test, which is not part of the autogenous media competency test ...
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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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Previous dynamic studies of the complex pendulum jaw crusher neglected the bearing clearance between the eccentric shaft and the moving jaw, which is crucial for analyzing the effect of bearing clearance on the dynamic performance of the crusher. By employing the Lagrange multiplier method, a dynamic model considering the bearing clearance of the …
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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. Pendulum mounted hammers with scale.-Test: At least 10 specimens preferably 20 specimens to be tested.
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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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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
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Appl. Sci. 2023, 13, 238 2 of 19 method (RSM), the predictive regression model of crusher performance was constructed. The amplitude of vibration force was greatly decreased by increasing the mass ...
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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 . The test
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The moving jaw rotates around the eccentric axis as well as swings around the same center (Fig. 2).By removing the moving jaw suspension shaft and the front toggle plate of simple pendulum jaw crusher, and suspending the moving jaw on eccentric shaft to combine the connecting rod and the moving jaw into whole, a compound pendulum jaw crusher …
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Therefore, the crusher often works with the screen to form a closed-circuit system (as shown in the third section of Fig. 2 for fine crushing). ... Work index method. A double pendulum impact testing machine is used to measure the impact crushing power index of ore or materials, and the size of the power index is used to indicate its fragility.
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intention of decreasing the Bond work index (Wi) will produce large energy savings (Workman and Eloranta 2003). In the previous research the specific crushing energy was determined indirectly based on the pendulum or falling weight tests. None of these ways of testing simulates the motion of the jaw crusher's jaw.
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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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Compound pendulum jaw crusher is one of the medium-grained stone crushing most commonly used crushing equipment. Compound pendulum jaw crusher because of its simple structure, low cost, simple, durable, easy maintenance, etc., most of the production has become most widely used crushing equipment. This crusher can …
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The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory work ...
DetailsThe paper by Angove & Dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5. The laboratory CWi value of 27.4 (metric) is almost within 4.5 units of the 22.4 value I calculated, so what you are observing is probably the natural variation in the crushing test.
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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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Bond work index theory represents an average value on size reduction and energy usage per unit of mass, but represents a fair approximation of a comminution process. But precisely because it is an average value implies that an optimization procedure on this theory has limited value. ... Three crusher types are used to demonstrate these ...
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The choice for using a crusher or not can be successfully made before the plant is built. In cases where the extent of the ore body in not known at the ... • JK Tech Crushing Work Index - Pendulum Test • Autogenous Abrasion Test • Bond Crushing Work Index Test • SAG Power Index (SPI) Test Design Methods Common design methods …
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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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