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A mineral of S.G. 2.4 was crushed and the average product size of the largest fraction was 6.25 mm. It was fed to a wet overflow ball mill of I.D. 1.5 m and ground in closed circuit at 75% of the critical speed. The work index of the mineral was 12.8 kWh/t. Estimate the largest size of make-up ball that should be used. Solution

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comments by r53toucan

Choose 13/16-28 . Get major, minor, PD. Construct the profile using a UN profile dimension . Set diameter. Helix 28 threads per inch. Alternatively, you can use the hole wizard in SW and override both the diameter and pitch. I think the pitch in SW defaults to distance between threads.

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EXAMPLE 16 When there is charged into a ball mill 31.25 g. of aluminum silicate, 57 g. of calcium carbonate, 17.25 g. of mica (325 mesh), 1.25 g. of phthalocyanine green, 4.1 g. of yellow iron oxide, 47 g. of rutile titanium dioxide, 6.25 g. of an anionic surfactant and 350 g. of one of the silicone-acrylate copolymer emulsions of Examples 13 ...

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