### A New Approach to the Calculation of Work Index and the

The work index W i was defined by F Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns The calculation is based on the size-energy relationship 1 2 21 11 nn eC x which for n = 0 5 x 1 = ∞ and x 2 = 100 by definition gives e ∞ 100 = W i and consequently C = 10 W i In theory for a given

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