05bond_crusher_work_index

  • Benchmarking: Bond-Boddington

    The Bond (impact) crushing work index is given as 27.7 based on a laboratory determination. Use the circuit survey data to compare the operating work index to this laboratory determination. The reported

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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. NQ-diameter drill core, frequently used in mineral exploration programs does not meet that specification, it being 45 mm diameter or less. This paper reports the effect of performing the impact 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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  • Compare and Understand Rod/Ball/Impact-Crushing/Abrasion

    Bond Rwi, BWI, CWI, Ai Work Index: What’s The Difference

    BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

    Specific energy consumption should be described with units of kWh/t and work index simply as a shorthand of “metric” or “short ton basis” or use the correct units of kW·h·t-1·μm-0.5.

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  •  · 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.

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  • Crushing work index Calculation-Crushing, Screening & Conveying-Metallurgist & Mineral Processing Engineer

    The 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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  • Bond Impact Crushing Work Index Testing Machine

    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 20 test runs. The Bond Crushing Work

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    Distribution of impact (crushing) work index for selected

    Therefore, large amounts of samples must be characterized in a short time. The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement

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  • impact crushing work index

    Responsive Multipurpose HTML5 Business Template Impact work index prediction from continuum damage model Dec 01, 2007· An impact pendulum that follows strictly Bond's standard for crushability measurement (Bond, 1947, Bergstrom, 1985, Tavares, 2007

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  • Bond Work Index (Energy equation)-Grinding & Classification Circuits-Metallurgist & Mineral Processing Engineer

    First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm). It would look like this: E_prim = [10*Wi rm *(2100-0.5-F 80

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  •  · 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. Source 1. Source 2. Source 3. Source 3. Source 4.

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  • Correlation of crushing work index and drop-weight

    The F80 values used were derived using a methodology that relates the primary crusher, close side setting (CSS) and ore hardness (Drop-Weight Index, DWi) to the primary crusher product P80 (Bailey

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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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  •  · Bond (1947) defined the impact energy per unit of thickness CB by dividing the impact energy by the thickness of each particle w, so that (1) C B = 117 ( 1-cos ϕ) / w where ϕ is the angle, w is given in mm and CB in J/mm. From this and the material specific gravity ρs (in g/cm 3) Bond proposed to estimate the crushing work index using the

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  •  · Impact Work Index Procedure. This is or was used by Sandvik 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

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  • BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

    Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users are often not aware of the nuances of the work

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  • Bond Crushing Law and Work Index Calculator (Comminution

    Work Index. Work Index (𝑊𝑖 ) 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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  • BOND TESTING EQUIPMENT-Laarmann

    Laarmann Group B.V. Op het Schoor 6 6041 AV The Netherlands [email protected] www.laarmann.eu webshop.laarmann.eu +31 6 23 40 00 33 ond crushing work index ( Wi) The ond crushing work index (Wi) describes the competency of the ore at larger particle

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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 industry standard, Bond did not fully define that procedure, and therefore significant discrepancies in test results can sometimes be

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  • 20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining the Bond

    The metal Bond ball mill is 30.5 cm inside diameter and. 30.5 cm inside length, with rounded corners. It is smooth except for the door hole used for charging. The grinding charge consists of 285 iron or steel balls (43 @ 36.8 mm diameter, 67 @ 29.7 mm diameter, 10 @. 25.4 mm diameter, 71 @ 19.1 mm diameter, and 94 @.

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  •  · Bond Work Index (BWI) versus Hardgrove Grindability Index (HGI). However it should be noted that this correlation is based on a very limited number of samples and is only applicable for the test equipment and experimental conditions used to obtain the W i and HGI values.

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  •  · The present work compares, for a wide range of materials, a number of measures that have been or have potential use to describe rock crushability for selection and optimization of crushers in

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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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  •  · A linear relationship between grindability index, G, and friability value was found as given in Eq.(2).The correlation coefficient is very high, at 0.99. (2) G = 0. 171 + 0. 021 (S 20) The relationship between friability value (S 20) and Bond work index (W i) also has a high correlation of 0.97 and this relationship is given in Eq.

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  • Testwork: Bond crushing work index-SAGMILLING.COM

    Crushing mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model . The work index is used to calculate the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm-20 mm. Categories: Testwork. Bond work index.

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  •  · The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to

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  • : Vladimir Nikolić, Milan Trumić · 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

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  •  · With the models proposed for α, β, and γ, the Bond Work Index (kWh/t) can be rapidly estimated (less than 2 hours) and show a high accuracy for mills of non-standard dimensions (R<sup>2</sup

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  • THE BOND WORK INDEX OF LIMESTONE AND ANDESITE MIXTURES

    The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i P c

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  • Comparison of UCS to Bond Work Indices-SAGMILLING.COM

    Figure 1 displays the measured crushing Work Index versus UCS for all mines in the data set. FIGURE 1: BOND CRUSHING WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS, MPa 10 20 30 40 50 WiC (metric) The scatter of

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