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In the prerequisite module entitled Work Index Efficiency , you have learned about work index analysis to define overall grinding circuit efficiency. In rod milling, you can use work index analysis to relate design and operating variables to overall circuit efficiency. However, you cannot use work index analysis for the same purpose on ball mill
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two. Results of Bond ball mill tests conducted with closing screens of 75 m or finer are to be treated with caution. The Bond Work Index relationship has been noted to apply down to approximately 70 m, and perhaps no finer , without making qualifications. Calculations First, calculate the actual Operating Work Index, WloACT-, of the
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Jan 15, 2018 Two surveys of the ball mill operating at different conditions found that milling efficiency could be improved by 20. These results highlight the importance of the mills operating conditions on energy efficiency as they can overwhelm the potential benefits of HPGR pre-conditioning.
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Dec 12, 2016 Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80 passing inch 6350 ...
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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 m 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 ...
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Operating Work Index Wio or KwhT passing a certain ... mill with a 30 mm graded ball charge and a 30 filling degree. ... The best grinding efficiency measured in terms of Operating Work Index Wio or KwhT passing a certain screen is obtained with the lowest speed.
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Ball mill operating work index reduction versus laboratory 5 microcrackingphantom cyclone effect Secondary crusher WiO is 18.1 kWhtonne versus laboratory determination 27.7 kWht. Show details of benchmarking. Benchmarking BondRowland SSBM Circuit Specific Energy Consumption - Tropicana
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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 ball mill work index test M. ib. is NOT the Bond ball work index. M. ic. and M. ih ...
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also reveals that the circuit is limited at the SAG mill, with spare power in the ball mill. Table 2 Power analysis of survey data Power Utilisation Units Survey 1 Survey 2 SAG Mill Specific Energy kWht 12.4 14.5 Ball Mill Specific Energy kWht 9.7 11.2 Operating Work Index Wio kWht 27.1
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2. Methods for assessing the energy consumption of the Bond Ball Mill are discussed 3. The average reduction in Work Index of HPGR products was 1.9 kWht 4. A similar magnitude of reduction was observed in the Size Specific Energy 5. Ball milling efficiency can vary significantly independently of HPGR operation Graphical Abstract
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The Industrial Comminution Efficiency Sub-Committee aims to provide tools for practitioners to measure the energy efficiency of comminution circuits using standardized metrics and methodologies. The guidelines developed by this group aim to define the recommended methods for quantifying grinding circuit efficiency using grinding power analysis ...
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Convert the ball mill work index to an Mib value of 25.39 kWht by assuming the test conditions suitable for a Wi of 17.6 metric units ... set mechanical efficiency to 0.6 so that sec crushing isnt limiting the throughput would be 0.45 to match plant kW draw. ... Predicts 1 increase in ball mill operating work index 17.75 versus ...
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Dec 18, 2018 By adding a VTM-3000 their overall specific energy consumption increased, which normally would mean that the circuit was more inefficient. However, in this case their operating work index actually dropped. This was a successful application of the Vertimill technology from both an energy efficiency and value recovery points of view.
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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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Nov 01, 1998 Using the Bond work index to measure operating comminution efficiency ... and Luckie, P.T., 1984, Process Engineering of Size Reduction Ball Milling, SME, Chapter 4, p. 76. Google Scholar Bond, F .C., 1952 ... Rowland, C.A. Using the Bond work index to measure operating comminution efficiency. ...
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Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8 dia. rod mill to 1 mm Closed circuit 8 dia. ball mill to P80 um The ore Test Work Index Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK ...
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Ball Mill Operatng Work Index Effeciency Operating Work Index Is Not The Specific Energy Consumption. Oct 24 2018 The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating
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In this work, the energy and exergy analyses of a cement ball mill CBM were performed and some measurements were carried out in an existing CBM in a cement plant to improve the efficiency of the ...
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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 BondRowland SSBM formula to predict E ball, a value of -0.05 means use 5 less than BondRowland SSBM formula to predict E ball. CF is a negative number if Wi O is less than ...
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rod mill work index has not been de ned as yet. The ball mill work index is con rmed at 16 kWht. The operating work index, though, is in the range of 21 kWht to 25 kWht showing high inef ciency. This raises the point that, in some cases, the Bond EF4 oversize factor calculation is not suf cient to compensate
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Apr 22, 2019 There are a lot of problems that most mineral processing plant meet when operating the ball mill, such as low grinding efficiency, low processing capacity, high energy consumption, unstable ...
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The ball mill oversize feed factor EF 4 BM is always calculated with the rod mill work index for the optimum feed size and the ball mill work index for EF 4 BM. The model assumes that the calculated value of E ssbm the specified contingency is greater than the sum of E sag E peb
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Ball Mills are generally used to grind material 14 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced.
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We showed you how to calculate your grinding circuits Operating Work Index in Grinding Bulletin No. 5 What exactly is Work Index and how can I make use of it In this basic example, the Operating Work Index was calculated to be 14.4 kWht. The Bond Ball Mill Test Work Index of the ore was measured to be 15.8 kWht. Then, taking Work Index ...
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