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ويركزمعهد بحوثالعامة لليمينغ الصناعة الثقيلةفي مجال البحوث وتطوير التكنولوجيا المتقدمة والمنتجات الموجهة لصالح العملاء، فضلا عن بناءالقدرة التنافسية الجوهريةليجعل يمينغالصناعة الثقيلةرائدةفي هذه الصناعة.من خلال توفيرنتائج البحوثالأساسية، ويدعم المعهديمينغالصناعة الثقيلةالتكنولوجيا والمنتجات لتكون أعلىمنهافي العالمالقائمة.

    • Bond Work Index - an overview ScienceDirect Topics

    The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% 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 index determination for the material size of interest, or by chaining individual work index calculations

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    • (PDF) A quick method for bond work index

    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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    • Bond Work Index (Energy equation) - Grinding ...

    2021-5-7  The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80)

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

    2020-9-24  WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at the drive pinions. 3.KEYWORDS Work Index, Work Index Efficiency, Bond Work Index

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    • Using the Bond work index to measure operating

    1998-11-1  Rowland, C.A. Using the Bond work index to measure operating comminution efficiency. Mining, Metallurgy Exploration 15, 32–36 (1998). https://doi.org/10.1007/BF03403155. Download citation. Accepted: 15 August 1998. Published: 01 November 1998. Issue Date: November 1998. DOI: https://doi.org/10.1007/BF03403155

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    • Bond Grinding Circuit Efficiency - ceecthefuture.org

    2018-2-20  The Bond Equation 5 Circuit Bond Work Index Efficiency (Rowland, 1973) WIeff = Circuit WI OC * Ore WI lab *Corrected for non-standard conditions This value represents the fraction or percentage of the Bond predicted energy (for that ore) that the plant is using. 1 = poor The inverse of this ratio can also be used. 6

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    • QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

    2016-12-27  grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82(10 √𝑃80 −10 √𝐹80) (1) where W i – Bond work index (kWh/t) P c – test sieve mesh size (µm) G – weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 – sieve mesh size passing 80% of the feed before grinding(µm) P 80

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    • CORRELATION BETWEEN BOND WORK INDEX AND

    2014-6-27  The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work index would be expected to remain constant since it indicates the

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    • Model:Raw Bond/Barratt SAB SABC Model -

    2020-3-22  The ball mill oversize feed factor (EF 4BM) is always calculated with the ball mill work index. The optimal feed size for the EF 4BM is always calculated using the rod mill work index. The Easag RM value in the circuit configuration is used to specify which work index to use for a particular size (RM above this size or BM below it).

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    • A new approach to the calculation of bond work index

    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 obtained due to ...

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    • QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

    2016-12-27  The aim of this study was to develop a new method for assessing the Bond work index in a ball mill (BBWI), which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials (Austin et al., 1981; Ahmadi and Shahsavari, 2009).

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    • O. I. SKARIN N. O. TIKHONOV CALCULATION OF THE

    2016-1-10  geous for being based on the Bond work indexes that are de-terminable in any well-fitted ore pretreatment laboratory (it is UDC 622.732 O. I. SKARIN (RIVS Science and Production Association) N. O. TIKHONOV (JV “IVS”) CALCULATION OF THE REQUIRED SEMIAUTOGENOUS MILL POWER BASED ON THE BOND WORK INDEXES O. I. SKARIN, Senior Researcher,

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    • Model:Raw Bond/Barratt SAB SABC Model -

    2020-3-22  Raw Bond Model. This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption (E SAG) using the 1979 Barratt equation and the classical Bond work index equation including Rowland efficiency factors.The model allows a manual calibration factor on both equations (CF SAG and CF ball, respectively).This formula usually gives higher total circuit specific energy ...

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    • Model:Bond HPGR and ball mill - SAGMILLING.COM

    2020-3-22  where CF is the Essbm calibration factor (in the Circuit Settings) for ball mill operating work index versus laboratory ball mill work index. A value of zero means use the Bond/Rowland SSBM formula to predict E ball, a value of -0.05 means use 5% less than Bond/Rowland SSBM formula to predict E ball. CF is a negative number if Wi O is less than ...

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    • USING THE SMC TEST® TO PREDICT COMMINUTION

    2020-3-24  The work index covering grinding in tumbling mills of coarse sizes is labelled M. ia. The work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ...

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    • C O N S U L T I N G L T D TECHNICAL MEMORANDUM

    EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball

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    • Quantifying the energy efficiency of fine grinding ...

    In previous publications, we have described how the size specific energy (SSE) can be calculated to predict the energy required to generate new minus 75 µm material. However, if we want to benchmark the performance of fine grinding where the product can be much finer than 75 µm, clearly we require a finer marker size. If we do this, we also need a way to compare results that

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    • PROCESS ANALYSIS AND ENERGY EFFICIENCY

    2016-11-23  PROCESS ANALYSIS AND ENERGY EFFICIENCY IMPROVEMENT ON PORTLAND LIMESTONE CEMENT GRINDING CIRCUIT by Sixto Humberto Aguero B.S. (M echanical Engineering), Universidad Nacional Autonoma de Honduras, 1992

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    • Circulating load - SlideShare

    2014-11-18  The Bond's work index values increased as test sieve size decreased. 16. Bond work index is changed with the change in the test sieve size and circulating load. This must be taken into account when energy consumption is calculated according to the Bond formula. unit energy cost extra increased as circulating load decreased from 250%.

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    • Bond index and energy index? - Page 1 of 2

    2013-9-8  However, the Energy Index is directly related to the Bond Work Index by the formula;-Work Index = C * Energy Index (where C is a constant) The constant C is a coefficient that represents the relative efficiency of the laboratory mill compared with that of the actual mill. (p70) Regards, Ted. Reply

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    • Calculator DOERING GmbH

    Bond Work Index (KWh/t) C s % Per cent of critical engine speed (%) S (g/cm³) SSpecific weight of the grinding stoc (g/cm³) D. m. Inner diameter of the mill (m) K. Proportionality constant ... C Cylpebs diameter in (mm) *Select a dimension which is 20 to 30% larger if the calculation results in a diameter of less than 25mm for balls and less ...

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    • JME

    2021-5-8  laboratory work index of the ball mill feed, the standard Bond ball mill was implemented. To estimate/predict the amount of consumed energy, and SAG mill feed hardness, Bond equation or Bond’s laboratory work index cannot be used, thus a Starkey mill was used to measure SAG mill power index [5]. To determine efficiency of mills and size

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    • USING THE SMC TEST® TO PREDICT COMMINUTION

    2020-3-24  The work index covering grinding in tumbling mills of coarse sizes is labelled M. ia. The work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ...

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    • Grinding Circuit at Mouteh Gold Mine

    2021-3-20  Wiopc denote Bond efficiency factor (%), Laboratory Bond index (kwh/t), and corrected operating Bond index (kwh/t) respectively. Bond efficiency factor values of more than 100% means that the mill consumes less than the laboratory Bond tests estimate and therefore the

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    • Quantifying the energy efficiency of fine grinding ...

    In previous publications, we have described how the size specific energy (SSE) can be calculated to predict the energy required to generate new minus 75 µm material. However, if we want to benchmark the performance of fine grinding where the product can be much finer than 75 µm, clearly we require a finer marker size. If we do this, we also need a way to compare results that

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    • Crushing of coal and calculation of size reduction

    2015-2-25  Bond Work Index 𝑤 = 10𝑊𝑖 1 𝑝 − 1 𝑓 W = Power required in KWH to crush 1 short tonne ( 2000 pound) of material Wi is the work index of the material p is the 80 % passing size of the product f is the 80 % passing size of the feed 2/25/2015 6:58:05 AM 23 24.

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    • Design, Construction and Performance Analysis of a 5 ...

    2017-8-4  laboratory ball mill. if the mill diameter is greater than 3.81m. The cylindrical . Feed Characteristics . The laboratory ball mill was designed for grinding limestone, meaning that the work index required for the specific power calculation was assumed to be the work index of limestone, which is 11.6 KWh/t, with a specific gravity of 2.6 g/cm. 3

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    • Geometallurgical estimation of comminution indices for ...

    2017-10-17  Preface This is the final report of my master thesis “'eometallurgical estimation of comminution indices for porphyry copper deposit applying mineralogical approach” at

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    • Circulating load - SlideShare

    2014-11-18  The Bond's work index values increased as test sieve size decreased. 16. Bond work index is changed with the change in the test sieve size and circulating load. This must be taken into account when energy consumption is calculated according to the Bond formula. unit energy cost extra increased as circulating load decreased from 250%.

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