Hardgrove grindability index

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Hardgrove grindability index [′här‚grōv ‚grīn·də′bil·əd·ē ‚in‚deks]

(engineering)

The relative grindability of ores and minerals in comparison with standard coal, chosen as 100 grindability, as determined by a miniature ball-ring pulverizer. Also known as Hardgrove number.

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