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

2021-3-10 Hello Everyone, I am dealing with the calculation of Bond Work Index. The flowsheet is attached. I have calculated primary ball mill bond index but for the calculation of second ball mill bond index I got trouble. In a bond energy equation, where should I select tonnage ? and where should I pick

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however, it uses the Bond ball mill test as basis for calcul ation of the energy required to grind material from an F80 of 0.7mm to the required product size. It therefore may be

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The grinding balls diameter determined by the Bond formula has a recommendatory character and serves as a starting point for calculating the necessary proportion grinding media feeding a new mill. More precisely adjust the ball load in the mill

Get PriceEmail contact### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

2021-2-24 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)

Get PriceEmail contact### Ball Mill Design/Power Calculation

2021-3-10 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 density, desired mill tonnage capacity DTPH, operating % solids or

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2014-10-1 The Bond equation is used to calculate ball mill specific energy from T 80 to the final product P 80 size. The ... BM = Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bond’s Law, (kWh/t) W T = Total grinding mill circuit specific energy (kWh/t) Note that K

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2010-4-21 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a ball mill, Wi, is then calculated from the following equation. [7]

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Bond’s Table II [BON 54] gives a correction coefficient for the mill’s shaft energy according to the latter’s type and φ.. 2) Milled output with a size that is less than 70 μm:. The reference value W i must be multiplied by an enhancing coefficient [BON 54, p. 384].. 3) Wet grinding and dry grinding: Dry grinding requires more energy than wet grinding.

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Bond ball mill and grind for an arbitrary number of mill revolutions (N 1 = 50, 100 or 150 revolutions). After grinding, screen the sample on the comparative sieve and determine

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2018-2-20 Circuit Bond WI Ratio Efficiency and Bond Standard Circuit Energy Factor . This circuit’s Bond WI Ratio Efficiency = OWISTD / WI-ACT = 9.70 / 11.7 = 83% . Bond Standard Circuit Energy Factor = 11.7 / 9.70 = 1.21. This circuit is using 1.21 times the Bond standard circuit energy. 2. SAG-Ball Mill

Get PriceEmail contact### 20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining

2020-9-24 µm. Note that—in order for no correction factor for ball mill product fineness to apply—the ball mill circuit P80 should be no less than approximately 70 µm (Bond, 1962). This Bond Efficiency determination should not be applied to cir-cuits with a P80 finer

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energy adjustment from 1.7 mm to the mill transfer size T 80 using Bond s Law (Starkey Larbi 2012). The Bond equation is used to calculate ball mill specific energy from T 80 to the final product P 80 size. The total circuitW .. Chat Now ; RETSCHLaboratory Mills Crushers and Sieve Shakers.

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ball mill efficiency equation pdf. dec 6, 2020 — in modeling and control of the grinding process in industrial . ... maximize the grinding due to their high density and specific surface area ... describing the process in the different size intervals. ... the ball mill circuit specific energy consumption is 8.69 kwh/t = (14 354 ÷ 1651). fines ...

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The Bond equation is used to calculate ball mill specific energy from T 80 to the final product P Grinding in Ball Mills: Modeling and Process Control The apparent difference between ball mill and AG/SAG mill efficiency is an artefact of Bond's implicit assumption that the particle size distributions can be defined by one point, the 80% passing ...

Get PriceEmail contact### Bond equation of cement ball mill sizing - CHAENG

2021-1-15 The method is used to size a cement ball mill. Efficiency correction factors are applied with the Bond equation. The method is valid both for clinker grinding and for raw materials grinding. This method only gives a rough and initial idea for sizing a cement ball mill.

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2016-12-27 micrometers in size. According to the Bond standard procedure, the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250% circulating load (Bond, 1949, 1952, 1961). The test is performed on a raw material approximately weighing 10 kg, which coarseness is 100% -3.327 mm.

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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 density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and

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The need for ultra fine particles has been increasing in the preparation field of raw powders such as fine ceramics and high functional products. A series of wet grinding experiments were carried out on inorganic powders such as calcite, pyrophyllite and talc by a stirred ball mill. The grinding rate constant K’ in the equation of grinding kinetics was examined based on the grinding kinetics ...

Get PriceEmail contact### Bond Grindability Index Test Ball Mill - 911Metallurgist

2021-3-11 A Bond Ball Mill, 12” x 12” of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 ½ lb ball charge, stand and receiving pan. Perform Fred C. Bond's grindability tests with this standard BWi test ball mill.

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2014-10-1 The Bond equation is used to calculate ball mill specific energy from T 80 to the final product P 80 size. The ... BM = Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bond’s Law, (kWh/t) W T = Total grinding mill circuit specific energy (kWh/t) Note that K

Get PriceEmail contact### Bond Grinding Circuit Efficiency - ceecthefuture

2018-2-20 The Bond Equation 3 The equivalent energy needed to go from very large rock to 100 um, i.e. a standard amount of size reduction! The Bond Equation 4. 2/20/2014 3 The Bond Equation 5 ... Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8’ dia. rod mill to 1 mm

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energy – particle size relationship in equation (2). 2. Plot the energy versus size and fit the power equation. Read both the exponent –a and coefficient K for the calibration sample. 3. Use a Bond work index test of a sample that requires adjustment (this is now a different sample than the calibration).

Get PriceEmail contact### Understanding Ball Mill Sizing Industrial

2019-10-13 Working Volume in High-Energy Ball-Milling Process on Breakage Characteristics and Adsorption Performance of Rice Straw Ash. ... A mill power equation for SAG mills. Mining, ... A comparison of the Bond method for sizing wet tumbling ball

Get PriceEmail contact### SPECIFIC COMMINUTION ENERGY - SMC Testing

2020-3-24 energy . The . Mib Estimate from Bond Wib. window gives the Mib value that the model has estimated from using equations 1 and 2. “Cautionary Tales” Bond, in his published papers specified that the Bond ball mill laboratory test should be carried out such that it produces a product P80 with a similar value to that which the full scale plant ...

Get PriceEmail contact### Testing method for ball mills - Outokumpu

The energy calculation (SAG Energy) is done using the following equation (1): SAG Energy (kWh/t)=C×Actual Revs×(Bulk SG/Weight (g)) (1), wherein C is a constant defined by the mill dimension and speed having a value 17.66 for the given test arrangement, Actual Revs is the amount of revolutions in the ball mill, Bulk SG is the specific weight ...

Get PriceEmail contact### Model:Bond-Rowland SSBM - SAGMILLING.COM

2020-3-22 Bond/Rowland Single Stage Ball Mill Model. This is a multi-stage crushing plant feeding a ball mill model that estimates the specific energy consumption (E BM) using the Rowland interpretation of the classical Bond work index equation including Rowland efficiency factors.. Testwork Required

Get PriceEmail contact### Model:Bond/Barratt SS SAG - SAGMILLING.COM

2020-3-22 Bond/Barratt Specific Energy Consumption Single-Stage SAG Model. This is a SAG or AG mill plus ball mill model that estimates the SAG mill specific energy consumption (E SAG) using the 1979 Barratt equation.. Testwork Required

Get PriceEmail contact### Determination Of The Bond Work Index Using An

Numerically, the work index is the energy required in kwh/t to reduce a given material from theoretically infinite feed size to 80% passing 100 microns. The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill.

Get PriceEmail contact### Bond Work Index Tests - Grinding Solutions Ltd

Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Test

Get PriceEmail contact### Cement Grinding Optimization - SlideShare

The following modified Bond equation was proposed for crushing (Magdalinovic, 1990): Wc = cP A Wi ( cP 10 - cF 10 ) (8) where: Wc - is energy consumed for clinker crushing (kWh/t), Wi - is Bond ball mill work index (kWh/t), Pc -is sieve size passing 80% of the clinker after crushing (µm), Fc - is sieve size passing 80% of the clinker before ...

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