Ball mill batch process the mill dimensions, d l, are 0.158 m and it is loaded with 6.5 kg steel balls between 25 and 32 mm in diameter.The mill rotates on rolls and its frequency is set to 70 rpm 1.667 hertz corresponding to 85 of the critical frequency.
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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.Com models expect a mill with a wave liner, and is not compatible with mills using smooth liners.
Table i shows the bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after lims.The concentrate weight recovery was in the order of 5060.Furthermore it may be observed that the bond ball mill work indices for the ore wi varies from 14.
D mill diameter in meters.The marcy expression is applicable for mill diameters between 1.Using peripheral speed, the rotational speed can be determined.Bond quantified the rod mill power draw as a function of the work index, capacity, and a series of correction factors pm wmtest,i ft q.Ft f1 f2 f3 f4 f5 f6.
The work index depending on the grind size.In this way, work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation.This study was carried out in a standard bond ball mill 305 mm x 305 mm size.
For p80s finer than 75 m, the levin test, a modified bond ball mill work index test, may be used to predict grinding performance.Signature plots.No general work index formula governing energy use over a range of conditions, like the bond equation for intermediate.
Bonds approach consists of determining the ore hardness characteristics, or work index wi via standardized laboratory testwork.The full suite of bond comminution tests provide the ball mill work index bwi, the rod mill work index rwi, the crusher work index cwi and the abrasion index.
The empirical formula to calculate bond mill work index bwi is presented in the equation 2 bwi 44 , 5 u 1 0 , 23 g bh 0 , 82 10 u 80 - 10 f 80 , 2 wherein u 1 is the passing size in micrometer of the test sieve, g bh is the ball mill grindability and u 80 and f 80 are passing values in a mount of 80 in the sieve.
Jktech would stage crush the sample to minus 3.35 mm, as required for the bond ball mill work index test feed.Bond work index rod mill titan process equipment.The titan bond work index rod mill is one-piece cast construction with integral wave liners of a form described by bond.
In 1991 the canadians developed the sag power index spi, test using 2 kg of material in a 300 mm diameter mill.This test has been further developed by starkey, hindstrom and orser2006.This test now includes a bond ball mill work index test.The macpherson test is.
W bonds work index kwht p 80 particle diameter of product, 80 passing m f 80 particle diameter of feed, 80 passing m o the bonds work index of a material, which is commonly used in the british commonwealth as well as us, is determined in a standard laboratory ball mill but the test is cumbersome to perform.
First, a jar mill grindability test requires a 5 lb.2 kg sample and produces a direct measured specific energy net hp-hrt to grind from the design feed size to the required product size.The second test, a bond work index determination, results in a specific energy value net hp-hrt from an empirical formula.
Mill ball mill closed circuit crushing to 16 mm open circuit 8 dia.Rod mill to 1 mm closed circuit 8 dia.Ball mill to p80 um the ore test work index circuit operating work index 9 the standard bond circuit coarse ore bins fine ore bins screen crushing screen classification rod mill ball mill this is the reference basis for all work.