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· We have an existing plant and I want to calculate the CWi based on Bond formulation and compare it with lab tests results. At the existing plant the data are F80= 370mm P80= 10mm Specific energy is 1 8 Kwh/t When we apply the Bond Equation we found that CWi (Calculated) = 21 54 Kwh/t. And the CWi (lab test) = 27 4 Kwh/t.

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· What is the Bond Work Index Formula-Equation In case you had forgotten here is a classic You can read all the details of this now "Biblical" grinding power requirement calculation formula in Fred Bond s original paper. You can also review the step-by-step Bond Work Index Test Procedure I

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· Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant . It is determined by Bond Ball Mill Grindability test in a lab using a Bond Mill.

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Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75106 microns. The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150250 microns. The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges

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· The Bond_Op. Work Index spreadsheet was designed to estimate the Operational Work Index of a given grinding installation of known dimensions and operating conditions based on the traditional Bond s Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such model).

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· The rod mill motor power is in horsepower at the mill pinion-shaft. For different length rod mills power varies directly as rod length. For difference between new and worn liners increase power draw by 6 and adjust for bulk density per Table A. Wet grinding rod mills are normally used in minerals processing plants.

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· The Bond_Op. Work Index spreadsheet was designed to estimate the Operational Work Index of a given grinding installation of known dimensions and operating conditions based on the traditional Bond s Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such model).

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· The objective of this work is the use of the ball milling technology as tool for the activation and chemical modification of cellulose fibers specifically of cellulosic material from jute. The traditional method used to date for the NCO-functionalization of cellulose fibers requires a solvent as reaction medium the action of a catalyst and a

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· A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

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· The basic parameters used in ball mill design (power calculations) rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific

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cycle test akin to the Bond Ball mill work . index determination. The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement. Without adequate piston

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· Ball Mill Charge Weight tons Density Apparent Slurry Filling Base Case Example Mill Speed Overfilling BOND S LAW APPLICATION Conventional Ball Mill Sizing Feed Size F80 microns Product Size P80 microns Specific Energy kWh/ton Power kW L/D rpm GRINDING TASK Net kW / Mill Net Power Requirement kW Design Throughput ton/hr

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3-5 Improved Ball Mill Design 3-6 Configuration of the Magnetic Field CaIculation of the Bond Work Index 4-2-43 Bond Mill Grindability Test chamber and the powder charge is spread on the inner surface of the chamber. This

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· The work index for the Buzwagi ore deposit during design ranged from 14.5 to 16.5 kWh/t and currently ranges from 17.20 to 18.67 kWh/t. This increase of the work index indicates a change in the hardness of the ore as the pit deepened during the last 7 years. This has a negative impact on milling energy costs because as the production progresses

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· Low grinding kinetics at ball mill compartment 01 suggests improper size grinding media selection and high wear rate for the case studied (f or media and liners). iv

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Bond Ball Mill Work Index BWi kWh/t 13.4 Bond Rod Mill Work Index RWi kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have

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· The present work investigates the effects of magnetic liners on ball mill performance particularly in terms of charge motion and mill breakage mechanism. The DEM approach was paired with the Hertz-Mindlin (no slip) model with RVD rolling friction and the influence of different values for the modeled parameters e μ s and μ r on the

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· circuit included an increase in the SAG mill ball charge from 8 to 10 v/v an increase in the mill ball available was the Bond work index which was calculated with insufﬁcient ore comminution effective grinding length inside the end liners and discharge grates) F6.2 9.5 m overﬂow ball mill

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· The batch ball mill used in this work is modeled after the experimental system used by Metzger et al. . Mill dimensions are provided in Table 3 and a virtual image of the empty grinding chamber is shown in Fig. 1. To assist the tumbling of the media two lifters are placed along the walls inside the mill spaced 180° from each other and

Chat Online### Work Index Determination for High Pressure Grinding Rolls

cycle test akin to the Bond Ball mill work . index determination. The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement. Without adequate piston

Chat Online### Work Index Determination for High Pressure Grinding Rolls

cycle test akin to the Bond Ball mill work . index determination. The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement. Without adequate piston

Chat Online### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75106 microns. The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150250 microns. The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges

Chat Online### Pontificia Universidad ólica de Chile

· The Bond_Op. Work Index spreadsheet was designed to estimate the Operational Work Index of a given grinding installation of known dimensions and operating conditions based on the traditional Bond s Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such model).

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To achieve this at both the design and operating stages we will require some representative sample for specific comminution test work. The test work will entail industry standard tests such as the Bond Rod Mill Work Index Bond Ball Mill Work Index JK/DWi tests and then some specific batch mill tests.

Chat Online### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75106 microns. The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150250 microns. The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges

Chat Online### Optimizing Performance of SABC Comminution Circuit of

· circuit included an increase in the SAG mill ball charge from 8 to 10 v/v an increase in the mill ball available was the Bond work index which was calculated with insufﬁcient ore comminution effective grinding length inside the end liners and discharge grates) F6.2 9.5 m overﬂow ball mill

Chat Online### Work Index Determination for High Pressure Grinding Rolls

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· Ball Mill Charge Weight tons Density Apparent Slurry Filling Base Case Example Mill Speed Overfilling BOND S LAW APPLICATION Conventional Ball Mill Sizing Feed Size F80 microns Product Size P80 microns Specific Energy kWh/ton Power kW L/D rpm GRINDING TASK Net kW / Mill Net Power Requirement kW Design Throughput ton/hr

Chat Online### Size Reduction and Energy RequirementScienceDirect

· A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

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