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Modeling The Specific Grinding Energy And Ball 21 conclusions continued in the present work equations were also derived giving zthe ballmill power drawp as a function of its dimensions internal mill diameter d and length l zthe ballmill power drawp as a function of the feed d f mm and the product size d mm the bond work index w i kwhshort ton and the mill throughput t short tonh zthe ballmill

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The mill was crashed stopped during various periods Samples were representatively taken from inside the mill in distances of 20–30 cm along the center and edge lengths for selected periods which are 2 5 10 15 20 30 45 and 60 min. For modelling of grinding process in pilot scale ball mill determination of the particle size distribution of feed and product of mill is an essential step.

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The feed samples of X Y and Z iron ores were ground in the BBM ball mill refers to a BBM of size 300 mm 300 mm with smooth liners to identify the PSD BWI and RT of each ore Grinding experiments were conducted according to Bond s standard test procedure .For each iron ore sample the RT taken to produce 250 circulating load in the BBM was measured by a new method.

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some grinding media are rotated on a common machine frame It is used for small batches of valuable chemicals and in laboratories Figure 1 Schematic representation of the crushing mechanism in a ball mill In wet grinding the surrounding medium is liquid as opposed to dry grinding Wet grinding

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The laboratory ball mill was designed for grinding limestone meaning that the work index required for the specific power calculation was assumed to be the work index of limestone which is 11.6 KWh/t with a specific gravity of 2.6 g/cm 3 or 2600 kg/m 3 The feed size F 80 of the ball mill was assumed to be 2 mm 2000 microns .

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Ball mill is a cylindrical device that used to grind and blend raw materials and it rotates around a horizontal axis partially filled with the material to be ground plus the grinding medium.

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2 days ago Heavier oversized particles are held in the grinding chamber by centrifugal force until micronized to a desired size Feed particle size is critical restricted by the size of the feed injector For mills of mm the feed size can be a maximum of 1.5 mm For smaller size mills the feed size is correspondingly finer.

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