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The percent by weight of the coal that passes through a 200-mesh sieve (a screen with openings of 74 micrometres, or 0.003 inch) is used to calculate the Hardgrove grindability index (HGI). The index is used as a guideline for sizing the grinding equipment in a coal-preparation plant. (Encyclopaedia Brittanica website definition) 
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Re: What Is Hardgrove Index ?
i saw that , but it has nothing to do with limestone ■
Re: What Is Hardgrove Index ?
Originally Posted by MaZaGAngeE
i saw that , but it has nothing to do with limestone
Exactly, as I always thought it only related to coal and coke 
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What is Hardgrove Index ?
for limestone what is the Hardgrove Index ?
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