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ASTM D/DM: Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method. These standards are covered in ASTM D In the test procedure a given amount “0” to “60” and stop. Remove the coal sample and test as per ASTM D Description. Primary Hardgrove Grindability Index (HGI) Standards prepared in strict accordance with the most current version of. ASTM D , Standard Test.

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A prepared and sized sample receives a definite amount of grinding energy in a miniature pulverizer, and the size consist of the pulverized product is determined by sieving.

The resultant size consist is used to produce an index relative to the ease of grinding [Hardgrove Grindability Index HGI ]. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

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Combining values from the two systems may result in non-conformance with the standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM D409/D409M:11ae1

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ASTM D/DM – Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

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