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The Hardgrove Grindability Index Standard Reference Sample (HGI-SRS) is a sample of coal used to calibrate instruments that are designed to determine the ease with which coal can be pulverized.

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Hardgrove Grindability Index (short HGI) is a measure for the grindability of coal.Grindability is an index, therefore it has no unit. The smaller the HGI, the harder is …

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