The Crusher Work Index in kWhton is a function of the materials impact strength and is defined by an argillite type of rock which has a work index of 16.5 bond crushing work index equipment. Coal Bond Low Energy Impact Test Fdp
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Abstract: The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitu tes ore characteristic and is used for ...
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Work Index T esting Equipment. Aspects . Min Miner Sci. 10(1). AMMS. 000728. ... The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm ...
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The testing results are used in comminution circuits design for processing plants under construction (process design basis, project design, and feasibility study) and optimization of crushing and grinding equipment at operating plants. Leading manufacturing plants and engineering companies accept and apply the obtained indices as input data for ...
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The 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.
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Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mill) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester. by David Michaud May 18, 2022 June 19, 2015 Categories Grinding.
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The 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.
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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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6 L.M. Tavares & M.A.C.W. da Silveira The Bond work index has also been used, in conjunction with empirical relationships, to estimate capacity factors of jaw, cone and gyratory crushers
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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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The 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. Although considered an ...
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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 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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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 Table here.
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The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) …
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Objectives. At the end of this lesson students should be able to: Explain the grinding process. Distinguish between crushing and grinding. Compare and contrast different type of equipment and their components used for …
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while researching about the bond crushing work index (Wic), I realised, that the procedure of the test is described differently in different sources. The same seems to be true for sampling. Two examples: Bergstrom 1985 _ Crushability and Grindability: The hights of the hammers start for every specimen at the start hight of 10° vs.
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Bond Crushing Work Index (3 replies) C crsp 6 years ago Dear all, while researching about the bond crushing work index (Wic), I realised, that the procedure of the test is …
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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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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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Abrasion Index Bond 37 2348 ... such as the Bond crushing work index. Heterogeneous ore is defined has having step-changes in breakage energy at … limestone crushing process, limestone crushing production line ...
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The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired …
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Energy of size reduction • Supplied energy is used to • Increase the new surface area • Initiate the flaws or cracks in the particle. The rest of energy used for following • Elastic deformation • Transport • Friction in b/w mill &particle • Heat • Vibration& noise. • Kick's law • Rittinger's law • Bond's law.
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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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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 may choose ...
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The 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. Typically twenty ...
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The later values from 's "Basics in Mineral Processing 2015" (Bond worked for All-Chalmers, which is now ) gives the value for basalt as 17.10. All kwh/st. For a particular application or project to size a mill circuit it would be prudent to have the Work Index (also for abrasion or crushing) determined at a mineral processing laboratory.
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Based on Bond's Crushing Law, the power required to crush a certain material will change by _____ if the diameter of the product is made smaller by 50% a. 50% b. 41% c. 25% d. 75% 0.87 Sphericity for a cylinder whose length equals its diameter is a. 1.5 b. 0.5 c. 0.87 d. 5
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Abrasion index (AI) • Crushing work index (CWI) • Unconfined compressive strength (UCS) • Bond rod mill work index (BRMWI) ... The range of equipment available for gravity separation includes standard mineral jigs, Kelsey jigs, in-line pressure jigs, spirals, tables, Mozeley sizer, Knelson, Falcon Superbowl, and others. ...
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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 Table here.
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Crushing mill work index is used in the SAGMILLING Bond/Barratt specific energy consumption model. The work index is used to calculate the energy requirement to …
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values of work index for different materials, see Table 25.3.2.4. An example of the use of the formula follows. Example 25.3.1.1. Assume a copper ore with Bond crusher work index of 14.2. The design feed rate is 1800 t/h (2000 tph). An Allis Chalmers 5474 crusher is selected with an open-side setting of 165 mm (6-1/2 in.). Solution.
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The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted on specimens of a nominal dimension between 50 mm …
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Traditional measurements of ore grindability are the Bond Work Index (Wi) values (Bond, 1952), divided into a low energy crushing work index (WiC) for coarse rocks (75-50 …
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The 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.
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(1) where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or …
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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*. …
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