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in a closed circuit dry grinding environment The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using quation 4

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a Magnetite Ore in Eastern Hebei China 24 Bond Ball Work Index Test A grinding mill F305 mm 305 mm was used for the Bond ball mill work index test 18–21 This ball mill was ﬁlled with 285 steel balls total weight of 20125 kg at an operation speed of 70 rpm The feed sample was prepared via crushing and sieving giving rise to a size smaller than 335 mm

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ball mill work index was averaging only 11.6 kWh/t which is not hard A rod mill work index ﬁ gure was not found but was thought to be in the 16 kWh/t to 18 kWh/t range The Xstrata Zinc 22 ft ID 40 ft EGL over ow ball mill ﬂ was installed at Mt Isa in 2009 This mill was put into single

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Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done Add about 500 g of silica sand into the mill containing the ball charge Seal the mill Rotate for 20 revolutions to clean Empty the mill charge and sand into the ball try once grinding is complete Clean out the mill using a brush Put the lid on the mill.

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The 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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The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 3.36 mm 6 mesh to product size in the range of 45 150 µm mesh thus determining the ball mill work index Wi B or BWi The work index calculations across a narrow size range are conducted using the appropriate laboratory work Read More

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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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INTRODUCTION The energy consumption for grinding according to Bond 1961 is deter mined by the formula 10 10 I The work index is determined by grinding experiments carried out in a labo ratory Bond ball mill Based on the results of grinding experiments numerical values of the work index Wi are calculated according to the formula

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