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The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. ... The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to 100% passing size of <3.35 mm. Any ...
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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.
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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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It is a measurement of how hard the rock is and an expression of the resistance that a material has to crusher. Shown in the table below is typical Work Index, reflecting the different rock characteristics.
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For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was …
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The single most common reason for an increase or drop in the production of fines is the WORK INDEX of the ore. If you remember, the work index of the ore is a method of measuring the degree of hardness. As the ore becomes harder the fracture lines in the rock become cleaner or sharper with less crumbling of the face and edges of the mineral.
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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.
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Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper.
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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.
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. ... continues to be much used for crusher selection. The ...
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sbm/sbm crusher work index hardness classification … MDPI May 19,2015.Another dimension is given by the scale of the test,ranging from pilot scale testing down to testing.load test,indirect tensile strength test,and hardness tests.Samples.Bond defined a crushing work index (in kWh t) …
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When Erf/Erp is greater than 1.29, the work index increases as the product size decreases, and when Erf/Erp is less than 1.29 the work index decreases. Eq. (8) suggests that a standard work index Wi100, or the work …
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size distribution of each ore with which the work index was evaluated. In all tests the size 80 is below 2000 µm. Fig. 1. Ores for the work index test: a) type and b) feed size 2.2. Ball mills and operation conditions Fig. 2(a-d) shows the ball mills used in the determination of the Work Index (standard mill BBM and
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The most widely used parameter to measure ore hardness is the Bond work index Wi. Calculations involving Bond's work index are generally divided into steps with a different Wi determination for each size class.
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Several authors have developed simplified tests to predict ball mill's energy consumption, typically using the Bond Ball Mill Work Index (BBMWI) as a reference.
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FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...
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work index and fragmentation results from drop weight tests, as well as a traditional technical measures used in the aggregate industry, the Los Angeles abrasion index.
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"Comminution represents a significant part of mineral processing plant operating costs. Yet, autogenous (AG) or semi-autogenous grinding mills (SAG) are difficult to control because of disturbances like feed size distribution and rock hardness. AMIRA, within project GeMIII, developed a comminution index from laboratory crusher data. The index correlated …
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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 …
WhatsApp: +86 18221755073
The hardness of coarse rocks cannot be inferred from fine rocks, because the gradient of hardness by size varies from one sample to another. The problem is that the tests that are performed at a coarse size statistically ... crusher work index (CWI) or impact . The test,
WhatsApp: +86 18221755073
Several authors have developed simplified tests to predict ball mill's energy consumption, typically using the Bond Ball Mill Work Index (BBMWI) as a reference.
WhatsApp: +86 18221755073
The traditional impact work index (Wi) proposed by Fred Bond over 60 year ago is still used today in characterizing material crushability.
WhatsApp: +86 18221755073
For the evaluation of laboratory and industrial experiments, the work index can be determined as follows: (1) BWI = 44.5 P 1 0.23 × G 0.82 10 P − 10 F where BWI = Bond's work index (kWh/sh. Ton), F = 80% passing size of original feed (μm), P = 80% passing size of circuit product (μm), P 1 = Test-sieve size (μm) and G = Net grams of sieve ...
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It is a measurement of how hard the rock is and an expression of the resistance that a material has to crusher. Shown in the table below is typical Work Index, reflecting the different rock characteristics.
WhatsApp: +86 18221755073
Similar to the ball mill work index, the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test (10 mm–12 mm) is closer to the size of the crushing test.
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Sizing a crusher can be done reliably calculated thanks to the Impact / Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper.
WhatsApp: +86 18221755073
Equations for Work Index Variations. In a recent publication fifteen different ores each had grindability tests made at 28, 35, 48, 65 and 100 mesh, with many work index variations at the different product sizes.
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Three Bond work index tests are commonly used in the industry. This essay discusses some observations from SAGMILLING database of published grindability results about relationships, and lack thereof, between the Bond comminution tests. A further comment is made about the Bond abrasion index a…
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the unconfined compressive strength and Mohs´ hardness are the most often used - along with the Bond work index - for crusher selection. These material characteristic values are used, empirically ...
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