Historical Version s - view previous versions of standard. More D 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 ].
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Active view current version of standard. Other Historical Standards. More D 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. This change is often sufficient to alter the grindability characteristics that will be reported when tested in the laboratory, and could produce different indices dependent on the conditions of drying and the moisture level of the 1. Therefore, the repeatability and reproducibility cited in this test method may not apply for these high volatile bituminous, subbituminous, and lignite coals.
The values given in parentheses may be approximate. 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.
Scope 1. Link to Active This link will always route to the current Active version of the standard.
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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. Combining values from the two systems may result in non-conformance with the standard.
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Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
Active view current version of standard. Other Historical Standards. More D 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. This change is often sufficient to alter the grindability characteristics that will be reported when tested in the laboratory and could produce different indices dependent on the conditions of drying and the moisture level of the 1.
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Active view current version of standard. Other Historical Standards. More D 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. This change is often sufficient to alter the grindability characteristics that will be reported when tested in the laboratory, and could produce different indices dependent on the conditions of drying and the moisture level of the 1. Therefore, the repeatability and reproducibility cited in this test method may not apply for these high volatile bituminous, subbituminous, and lignite coals.