Mineral processing is concerned with the relationship between; The amount of energy put into a rock or particle of a known size and, the reduced particle size after the comminution (the action of reducing a material) process has taken place. ‘Work Index’ is the amount of energy required to do this work. It is a measurement of how hard the rock is and an expression of the resistance that a material has to crusher.
Shown in the table below is typical Work Index, reflecting the different rock characteristics. It shows for example, that their is more energy required to crush Basalt then Iron Ore.
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