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.
Get PriceFor 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.
IV. Conclusions and Recommendations A sample ore was given and was crushed then underwent a series of grinding to achieve a 250 circulating load. The Bond work index was determined to be equal to 41.38 kWhtone. It is recommended that future researchers carefully handle the samples and use equipment such as the Ro-Tap sieve shaker instead of manual labor to avoid decrease in sample ore.
Numerically, the work index is the energy required in kwht 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.
Oct 19, 2017 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 can only by industrial test performing.
can be determined using the data generated by a conventional Bond ball mill work index test M. ib. is NOT the Bond ball work index. M. ic. and M. ih. values are also provided as a standard output from a SMC Test Morrell, 2009. The general size reduction equation is as follows Morrell, 2004. b f x f x 2. 1 i i. 4 2 W M x x. 1 1 where ...
Bond Work Index Testing Equipment and Procedures See Annexes A, B and C for Bond crushing, rod mill and ball mill test equipment and procedures. Accuracy of Comparative Circuit Work Index Efficiency Determinations This will follow in an addendum to this guideline Sub-topics will .
A fundamental equation for computing the specific energy required for the mill during the comminution process is Bonds equation Wills and Napier-Munn 2006, Skarin and Tikhonov 2015 ...
For overflow ball mills, the charge should not exceed 45 of the mill volume . For grate discharge mills, the charge should occupy about 50 of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work ...
One is the Hardgrove grindability index and the other the Bond work index. The Hardgrove index is determined using the ASTM method D 40971. It involves grinding 50g of the material, e.g. coal, of specified size 1630 mesh cut in a specified ball-and-race mill for 60 revolutions.
and the Bond Ball Mill Test Work Index WiBM GMG, 2016a, and the Morrell equations and their application see Annex B. A worked example is provided in Annex C. 5. SCOPE The Morrell method can be used to predict the specific energy of comminution circuits, where such circuits include combinations of any of the following equipment
Shahsavari, Procedure for determination of Bond ball work The grindability experiments was carried out on the four typical index in the commercial operations, Min. Eng. 22 2009 104106. samples of copper, leadzinc, manganese and iron ore in specified 13 L. Tavares, R. Carvalho, J. Guerrero, Simulating the Bond rod-mill grindability ...
The Ball Mill Abrasion BMA test was developed by the University of Queensland Materials Performance group to simulate the high stress abrasion conditions experienced in production ball mills.
ball mill work inde. Bond Ball Mill Work Inde Clinker-ball Mill Bond Ball Mill Work Inde Clinker. Processing capacity198-469th Feeding size21mm Appliable Materials quartz,iron ore,copper mine,ore,construction rubbish,glass etc.All grindable materials, various metal ores, non-metallic ores, non-flammable and explosive materials
Numerically, the work index is the energy required in kwht 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.
Shahsavari, Procedure for determination of Bond ball work The grindability experiments was carried out on the four typical index in the commercial operations, Min. Eng. 22 2009 104106. samples of copper, leadzinc, manganese and iron ore in specified 13 L. Tavares, R. Carvalho, J. Guerrero, Simulating the Bond rod-mill grindability ...
can be determined using the data generated by a conventional Bond ball mill work index test M. ib. is NOT the Bond ball work index. M. ic. and M. ih. values are also provided as a standard output from a SMC Test Morrell, 2009. The general size reduction equation is as follows Morrell, 2004. b f x f x 2. 1 i i. 4 2 W M x x. 1 1 where ...
3- STANDARD BOND TESTS The Bonds 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 m. If the breakage
and the Bond Ball Mill Test Work Index WiBM GMG, 2016a, and the Morrell equations and their application see Annex B. A worked example is provided in Annex C. 5. SCOPE The Morrell method can be used to predict the specific energy of comminution circuits, where such circuits include combinations of any of the following equipment
EF5BM P8010.3 1.145 P80 3 The EF4 formula requires both the rod mill and ball mill work index rod mill Wi is used to calculate the optimal feed size and because this is a single-stage ball mill calculation, the F80 is actually the rod mill feed size 10,000 m from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 m to ball
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
This is typically quantified based on Bond ball work index BBWi tests of HPGR products, which generally report a significantly lower BBWi value than for the HPGR feed Wang, Nadolski et al 2013. The implications for the equipment sizing of the downstream ball mills can be significant Patzelt et
Calculate Top Ball Size of Grinding Media Equation amp Method. Calculate Top Ball Size of Grinding Media FRED C. BOND Equation amp Method. Although it was developed nearly 50 years ago, Bonds method is still useful for calculating necessary mill sizes and power consumption for ball and rod mills.
Correlation Between Bond Work Index And. The bonds standard ball mill is used to determine the work index value of differ ent samples the bond work index is defined as the kilowatthours per short ton required to break from infinite size to a product size of 80 passing 100 m if the breakage