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The work required to form particles of size Dp from a very large feed is proportional to the square root of the surface-to-volume ratio of the product, sp/vp. Since F s = 6/Dp, it follows that where Kb is a constant that depends on the type of machine and on the material being crushed.
The work index, wi, is defined as the gross energy required in KWH per ton of feed to reduce a very large feed to such a size that 80% of the product passes a 100m m screen. If Dpis in millimetres, P in KW, and in tons per hour, then, if 80% of the feed passes a mesh size of Dpa millimetres and 80% of the product a mesh of Dpb millimetres, it follows that...
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