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Oct 15 2015 Summary of HGI and BWI data for all samples Hardgrove Grindability Index HGI 80 passing feed size F 80 80 passing product size P 80 grindability per revolution G final revolution count R F bond work index W i work input W gross calorific value on dry basis H bond work index gross calorific value ratio W/H .

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Oct 01 1971 Determination of the grindability of coals shales and other minerals by a modified Hardgrove machine method F AGUS and P L WATERS The Hardgrove machine method for determining the grindability of coal may be applied to shales and other minerals provided a 75 cm3 grindability sample is used instead of the 50 g size to which for coal it is equivalent.

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Jun 16 2015 The grindability is useful in evaluating power requirements for grinding To design a particle breakage system it is important to know the energy required to achieve a given size reduction The most commonly used energy size relationship is Bond s third law equation Wi = work index of the material comminuted It is a relative measure of the

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