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are the Bond Work Index Wi values Bond, 1952, divided into a low energy crushing work index Wi C for coarse rocks 75-50 mm, a rod mill work index Wi RM for intermediate sized particles 25-3 mm, and a ball mill work index Wi BM for small particles 3 mm Ammtec, 2000. Laboratory
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus.The SAGMILLING.COM models expect a mill with a wave liner , and is not compatible with mills using smooth liners .
Use of work index since its introduction in the 1960s the bond ball mill work index bbmwi parameter has been extensively used in predicting ball mill power draw along with comminution circuit design the work index parameter is widely used in tracking mill performance due to
ball mill grindability. The test mesh used was 100 mesh P 14-16 . The Bond work index W i was calculated from Equation 2 W i 44.5P 1 0.23 X Gbp 0.82 10P 80 0,5 0.5 10F 80 2 Where F 80 is the size in m, at which 80 percent of the new feed to ball mill passes,
Jan 01, 1988 The correct procedure is to crush the plus 1.3cm fraction to minus 1.3cm, and then combine it with the rest of the sample as the feed to the test must be minus 1.3cm. A similar Bond work index determinations 121 point was made for a simplified WI test by Yap et al 11.
The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill Bond 1961.
The Bond work index determination according to the standard Bonds test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula Bond, 1961 1 where W i Bond work index kWht P c test sieve mesh size m G weight of the test sieve fresh un-
Procedure For Determination Of Ball Bond Work Index In. 1 introduction a 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 2006this 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
grindability, on the Bond ball mill grindability G hg and work index W, are investigated based on four samples of natural amorphous silica. In the experimental studies, the relationships between the Bond work index with circulating load and test sieve size were examined. I INTRODUCTION Currently, silica fume is widely used as a supplementary cementing material to enhance the
Therefore, the work input is given by, 10 10, W Wi 7P7F1 Where W the energy input to the mill, kwht Wi Work Index, kwht P square sieve opening which 80 of the product passes, microns F square sieve opening which 80 of the feed passes, microns Equation 1 is the mathematical statement of the Third Theory, or the Bond equation. Numerically, the work index is the
Ball Mill Bond Work Index WiB 12.1 kWhst Rod Mill Bond Work Index WiR 10.5 kWhst Impact Bond Impact Index WiI 7.9 kWhst SAG Power ... MEI Online - Bond Work Index An abreviated test that did not reach steady state as a Bond Work Index does would only be ... mill sizing etc.
The Bond work index W i is widely used in the mineral industry for comparing the resistance of different ores to ball milling and can be used to estimate the energy required for grinding, which...
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 Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage-crushed to 100 passing size of 3.35 mm.
Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6.
The Bond Work Index is determined by a standardized procedure in which the... namely one in which wet grinding is done in a ball mill of 2,44 m 8 ft diameter.
The method requires all the elements of the ball mill work index test to be filled in Ball mill Wi test closing screen size, umclosing, m Ball mill Wi test product size, P 80, m Ball mill Wi test feed size, F 80, m Ball mill Wi grams per revolution at test conclusion, gpr Required parameters. F 80, m is the 80 passing size of the fresh feed to the circuit expected to be a Bond-compatible size distribution.
Jan 01, 1988 The correct procedure is to crush the plus 1.3cm fraction to minus 1.3cm, and then combine it with the rest of the sample as the feed to the test must be minus 1.3cm. A similar Bond work index determinations 121 point was made for a simplified WI test by Yap et al 11.
zThe ball-mill dimensions internal mill diameter D and length L, for a given LD ratio, for feed size D f and product size d mm, for a known Bond work index w i kWhshort ton and for desirable capacity T short tonh, can be calculated from D d T D D L f 3.5 0.106 0.193 0.962 10.38 0.9180 1
The Bond Work index is determined by a standardized procedure in which the material is crushed in stages to finer than 6 mesh 3,35 mm, and ground under specified conditions in a laboratory ball mill,.... Linn-stunt Lizenithne 1,6 Illll.
Bond Test WIs kWht Crushing16.0 Rod Mill 14.5 Ball Mill 13.8 . Bond Standard Circuit Work Index W1 16.0 x 10 16,000 10 165,000 0.9 W2 14.5 x 10 1,000 10 16,000 3.4 kWht . W3 13.8 x 10 125 10 1,000 8.0 kWht . W Total 0.9 3.4 8.0 12.3 kWht
In general, Bonds 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 Bonds work index using simple field measurable properties of rocks.
Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwht, remaining 6 samples are marked as hard - rock because of
are the Bond Work Index Wi values Bond, 1952, divided into a low energy crushing work index Wi C for coarse rocks 75-50 mm, a rod mill work index Wi RM for intermediate sized particles 25-3 mm, and a ball mill work index Wi BM for small particles 3 mm Ammtec, 2000. Laboratory
XMGQ305 Grinding Work Index Ball Rod Mill . Description XMGQ305 Grinding Bond Ball Rod Mill is mainly applied for testing the grinding work index of the material of every kinds of ores, slag, etc. Under the specific rotation speed for dry grinding, then screening the products, weighing, repeat operation several times, getting the grinding work index kWht. Technical Parameters