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Get PriceHalf Drillcore pre crushed to < 3.35 mm and sieved The Bond Index conforming ball charge consists of 43 x 1.45 balls 67 x 1.17 balls 10 x 1 balls 71 x 0.75 balls 94 x 0.61 balls The optimum number of grinding balls is 285 However the ball diameters vary due to wear Therefore the total ball number should be adjusted
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Get Priceµm 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 than approximately 70 µm without making qualifications 3.
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Get PriceThe 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.
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Get PriceThe ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill see Figure 3.10 a question arises as to whether this practice will alter the ball mill work index BW i of the material
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Get PriceBall Mill Wio BWio 8.6 Circuit Wio OWio 14.6 Bond Ball Mill Work Index BWi kWh/t 13.4 Bond Rod Mill Work Index RWi kWh/t 18.1 Table 1 Example of AG/SAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on
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Get PriceJan 01 2013 To calculate Bond rod mill work indices the four samples were screened and the particle size distributions plotted in Fig 2.The plot was used to find F 80 of the samples for calculations Fig 3 Fig 4 show the grinding kinetics of Pb Cu Fe and Mn ores in the Bond rod mill in different test sieves The slopes of all lines in the figures are equal to the k value of Eq.
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Get PriceTypical values of Bond ball mill work index for soft oxidised ore bodies lie in the range 5 10 kWh/t at a standard product size of 80 passing 75µm.
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Get PriceThe FC Bond Mill was designed by F C Bond for use in determining the Bond Ball Mill Index a measure of grindability and power required to mill various ores FC Bond Mills are used in laboratories throughout the world A copy of Fred C Bond s Method of Crushing and Grinding for determination of the Bond Index is included with each mill.
Get Pricein the design of a grinding circuit 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 2 Procedure 2.1 Bond Ball Mill Grindability The sample was crushed to 100 passing 6 mesh 3.35mm from this a 700 cc volume was measured and weighed to be Read More
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