Generally Bond work index for mill dimensioning and controlling is measured by grinding a feed material of <3.36 mm particle size under standardized conditions in a so-called Bond mill (D × L = 305 mm × 305 mm).

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Bond Ball Mill Grindability Test. The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm.

Get PriceInsmart Bond's Ball-Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. This Index is widely used in the industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding and for ball mill scale-up.

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Get Priceand aWork Index of11,5kWh/t wasfound. Not only to15,6kWh/t astheapertures ofthelimiting screening wastheWork Index reduced toamorerealistic figure by werereduced from425to150 ~m.TheWork Index then themodified procedure, butthenumber ofcyclesrequired increased abruptly to44,2kWh/t, andnofewerthan44

Get PriceThis Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or ... Get Price Bond Work Index Formula-Equation - Mineral Processing ...

[PDF]Get PriceWi = Bond Work Index of the ore, %Cs = fraction of the critical speed, and D = diameter of the mill inside liners (m). Equation (1) demonstrates that larger balls are required to break larger particles. If the feed to a fine grinding mill contains large particles then .

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Get PriceAccording 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 -3.327 mm.

[PDF]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 index would be expected to remain constant since it indicates the .

[PDF]Get PriceHere - Minerals Engineering International Online 13 Apr 2010 ... which, in turn, is used to estimate the Bond ball mill work index. ... 14.00 Prediction of the Bond Work Index for variability analysis ..... grade by grinding the secondary cleaner tails using ultra fine technology and floating at.

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[PDF]Get PriceAdditionally while techniques like the Bond Work Index and "scale up factors" are useful for coarse grinding, they can significantly underestimate grinding needs below 100 microns. Similarly Tower Mill laboratory tests typically use much finer media than can be used in full scale operation and testwork is done in "batch" mode.

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Get PriceA Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill scale-up.

[PDF]Get PriceThe 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.

[PDF]Get Pricecharacterized for Bond Work Index, which represents the specific power required (kWh/ton) to reduce the ore from an infinite size to 80% passing 100μm. The Bond Work Index test is performed in a 305 mm diameter by 305 mm length ball mill (Bond Ball Mill). Table 1: Work Index for two different test-sieve sizes: No. Test-sieve size (μm) Wi (Kwh ...

Get PriceJul 22, 2017 · One of them is Bond Work Index having association with ball mill and second one is Hardgrove Index which shows strong association with Vertical Spindle Mill. The best experiment is standard Bond Work Index (BWI), which associates the energy or intensity of energy required to minimize from initial size of mass of material up to and ulti- mate ...

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