The work input shown for blasting is calculated by the Bond equation. The actual energy input is .33 kg/ton, or .31 kwh/ton. Thus, the efficiency compared to Bond is 77 percent. This is likely due to the variable nature of rock and the transmission of the energy, and the possibility that Wi is greater than 14.87 in the unblasted state. The cost ...
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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 .
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Based on the nth order grinding kinetic equation and the theory of linear additivity in the grinding process, the grinding kinetic characteristics of the feed and the circulating load in standard Bond rod-mill grindability tests are studied.A new method of simulating the calculation of the Bond rod-mill work index by using the grinding kinetic test data of the feed is proposed.
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JKTech Laboratory Services Bond Ball Mill Index Test (BRMWI) A Bond Ball Mill Index Test (BBMWI) is a standard test for determining the Ball Mill Work Index of a sample of ore. The BBMWI is a measure of the resistance of the material to crushing and grinding. It can be used to determine
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In general, Bond's work index is used to determine the grinding efficiency and also to calculate the power requirement. The process is very time consuming and it requires skilled labor and specialized mill. A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks.
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Apr 03, 2018 · What is the Bond Work Index Formula ... this now Biblical grinding power requirement calculation formula in Fred Bonds original ...sag mill estimation hogg fuerstenau model ...
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from 1.4 to 34 kWh/t and Bond ball mill work index values vary from 6 to 24 kW/t for the same ores. Project design tonnages varied from 200 to 150,000 t/d, SAG mill sizes varied from 10 ft to 40 ft diameter in ple SAG mills, and ball mill sizes varied from 7 ft to 27 ft in diameter.
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The work input shown for blasting is calculated by the Bond equation. The actual energy input is .33 kg/ton, or .31 kwh/ton. Thus, the efficiency compared to Bond is 77 percent. This is likely due to the variable nature of rock and the transmission of the energy, and the possibility that Wi is greater than 14.87 in the unblasted state. The cost ...
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Nov 18, 2014 · Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13. Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index .
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The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ...
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that is used has come from a Bond ball mill work index test that has generated a similar value to that input to the "Tumbling mill circuit product P80- final grind" field. If this is not the case the resultant specific energy prediction accurate might be compromised.
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1 Introduction Finding the bond work index of an ore type is crucial to determining the grinding energy required during comminution in a ball mill. The bond work index is a constant characteristic related to the hardness of a specific ore type. Bond work index is one of three different approaches that can be used to calculate the work index of an ore.
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bond work index for an ultrafine mill . It starts with Bond's Work Index equation: 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 of the ore from a very large size to 100 um.
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Quick method for bond work index approximate value determination. 325. ... 3.327 mm.In this work, a procedure for the calculation of the Bond work index is suggested for cases when the Bond ...
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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 a .
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Calculate Capacity Of A Grinding Mill . Ball Mill Grinding Capacity Calculation Liverpool . Moreball mill feed capacity calculations theaxisnov 27, 2016 ball mill grinding capacity calculation.Ball mill capacity wet how shall i calculate the machinist calc pro feed and speed how to calculate calculation of grinding media charging ball milljan 7, 2015 3.2 calculation of the critical mill.
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Drop Weight Index (DWi) and the coarse ore grinding index (M ia). Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib). The M ia and M ib indices are used to calculate specific energy for the coarse (W a) and fine (W b) components of the total grinding specific energy at the pinion (W
Get priceThe 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 ...
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3 days ago · The total specific energy input for the two milling stages was 14.6 kWh t-. Calculate the operating work index for the circuit. Ans. 16:8 (kWh t21) b) Circuit feed samples taken at the same time were sent for Bond work index testing. The rod mill test gave RWilab of 14.5 kWh t- and a ball mill work index BWilab of 13.8 kWh t4.
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Sep 08, 2013 · 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.
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2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up (Bond's Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)
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Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closed-circuit dry grindability test performed in a standard rod mill.
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Correlations for the Grindability of the Ball Mill As a Measure of .. standard equation used by them for the ball mill work index . to bond index calculation where the power consumption will indicate directly about the cost »More detailed
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The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions. It is a 'locked cycle' test conducted in closed circuit with a laboratory screen.
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W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers; F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles.
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The Bond work index is a very important parameter of the third theory of com - minution. It has a decisive effect on the design of crushing and grinding equipment, the calculation of its motor capacity and the appraisal of the operation efficiency of the equipment. The standard method for the determination of the Bond work index is the tradi-
Get priceNov 18, 2014 · Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13. Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index .
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Bond Grinding Circuit Efficiency Meeting of Bond Efficiency Guideline Working Group of the Global Mining and Standards Group Salt lake City, 2014 Based on Presentation to the 2008 Meeting of SME, by C.A. Rowland, Jr. and R.E. McIvor. Bond Grinding Circuit Efficiency • The Bond Work Index equation • Ore test WI • Circuit operating WI
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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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