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Why HPGRs did not make the list?

Here we see the coarse fractions are not competent, the crushing work index is in the range of 5 to 10 metric units, but this ore has very high ball mill work index values, over 20 units.

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Trade-Off Realities in HPGR vs. SAG Milling—A Practical …

Crushing Work Index kWh/t 19.1 21.0 Bond Rod Work Index kWh/t 21.5 22.0 Bond Ball Work Index kWh/t 18.2 18.3 Abrasion Index g 0.32 0.53 JKDW Axb 31.5 - ta 0.32 0.3 …

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Bond Abrasion Index VS Bond Work Index

Compare and Understand Rod/Ball/Impact-Crushing/Abrasion BOND Work Index

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Bond Impact Crushing Work Index -Procedure and Table of …

Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond …

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Crusher Work Index Hardness Classification

Comparison of UCS to Bond Work Indices. 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.

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Bond Work Index Formula-Equation

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 index at 80% passing 100 microns calculated from the exposure ratios, can be found from the following Eq. (9):

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BENCHMARKING COMMINUTION CIRCUIT …

calculation (GMG, 2015), with the rod mill taking 25% and the crushing work index 5%. Newmont's operations cover the full range of the BWi energy curve, with Mine 7 the …

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Example Lithology database table | Download Scientific …

A quick diagnostic of whether an ore is "complex" or "simple" is to compare the three Bond work indices: "simple" ores generally have the same value for all three work index values, whereas ...

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coal crushing work index

impact crushing work index – Crusher South Africa company profil pt.tapin coal terminal … Impact and Crushing work index tests…

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Comparison of measures of rock crushability

Also, values of crushing work index (CWi) increased inversely with the A*b breakage index, as commonly observed (Napier-Munn et al., 1996; Tavares and Silveira, 2008). In order to demonstrate …

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Comparison of UCS to Bond Work Indices

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 …

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work index values for crushing

Comparison of UCS to Bond Work Indices. Work Index values (crushing, rod mill and ball mill). ... The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi C, CWi or IWi (impact work index)). Bond Tests Mining SGS * Bond F. C., "Crushing Tests by …

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Bond ball mill work index database table for …

According to Fred Bond, "the work index is the comminution parameter which expresses the resistance of the material to crushing and grinding" [1][2][3].

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crushing work index power draw – Grinding Mill China

Ammtec. Bond Crushing Work Index (CWI) … This index is used to calculate the power draw requirements of a rod mill if one is included in the process flowsheet. » More detailed Work Index Assignment – 2011 – Norman B. Keevil Institute of …. Work Index: An empirical equation that relates power consumption in crushing and … Typical power …

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A Statistical Comparison of Bond Ball Mill Grindability Work Index

The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...

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A Statistical Comparison of Bond Ball Mill Grindability …

direct comparison of the actual testing apparatus used for Bond Work Index determinations. While the Bond Work Index and procedure have become a world standard for measuring the energy required to grind material and designing grinding circuits, the test is highly empirical and can vary significantly as a result. According to one isolated study ...

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impact crushing work index

bond work index for crushing coal crusher in india. bond crushing work index equipment coal surface mining coal crushing work index 14 oct 2013 . crusher wikipedia 2018 6 15 a crusher is a machine designed to but as coal took hold the larger operations became the coal each crusher is designed to work with a certain

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Bond Crushing Law and Work Index Calculator …

Work Index. Work Index (𝑊 𝑖 ) is a parameter used to quantify the gross energy required in kilowatt hours per ton of feed needed to reduce a very large feed to such a size that 80% of the crushed product is finer than a 100 microns size. It is derived from Bond's Law, which relates the energy required for comminution (crushing and ...

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Comparison of Ore Hardness Measurements for …

standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard …

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work index of biomass crusher

This energy The Bond work index is regarded as one of the crushing resistance . Value of work index for different agricultural materials from literature,Download Table Value of work index for different agricultural materials from in a commercial ultra-high speed grinder operated at 20000 rpm for 2.0–5.0 min for the work is to analyze the ...

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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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Using the Bond work index to measure operating comminution …

Rowland, C.A., 1973, "Comparison of work indices calculated from operating data with those from laboratory test data," Proceedings Tenth International Minerals Processing Congress, The Institution of Mining and Metallurgy, London, UK, pp. 47–61. Google Scholar

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Comparison of UCS to Bond Work Indices

Unconfined Compressive Strength (UCS) is a commonly used rockmass strength measurement used by rock mechanics practitioners. This paper examines potential …

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The Importance of Work Index in Mineral Processing

The higher the Work Index the more work required to crush the rock. The amount of energy required to do this work is important to understand to maximise efficiency. ... Crushing Work Index. Material. 8. Clay. 13. Coal. 22. Basalt. Crushing Work Index. Material. 17. Iron Ore. 14. Copper Ores. 3. ... Australia +618 6444 7917; Malaysia Office ...

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Table of Bond Work Index by Minerals

This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. [table "" not found /] Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution

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EFFECT OF CORE DIAMETER ON THE BOND IMPACT CRUSHING WORK INDEX …

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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BENCHMARKING COMMINUTION CIRCUIT …

388 Hay Street Subiaco, Western Australia 6008 Abstract ... From these comparisons, empirical constants were applied to the laboratory test results so that the pilot ... (GMG, 2015), with the rod mill taking 25% and the crushing work index 5%. Newmont's operations cover the full range of the BWi energy curve, with Mine 7 the most competent ...

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Relationship between A*b and Bond impact work …

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 ...