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ASTM D409-08

Current Revision

Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

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1.1 This test method covers the determination of the relative grindability or ease of pulverization of coals in comparison with coals chosen as standards. 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)).

1.1.1 Some coals, such as some high-volatile bituminous, subbituminous, and lignite coals, can undergo physical change as the natural or seam moisture is released during handling and preparation. 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 1.18-mm by 600-μm (No. 16 × No. 30) (see Test Method D 4749) materials used for the test. Therefore, the repeatability and reproducibility cited in this test method may not apply for these high-volatile bituminous, subbituminous, and lignite coals.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses may be approximate.

1.3 It is recognized that the term weight is considered equivalent to mass as used in this test method.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

This test method develops a measurement of grinding or pulverizing characteristics that can be used to evaluate the yield, or energy input, or both, required in a grinding or pulverizing process.

SDO ASTM: ASTM International
Document Number D409
Publication Date May 15, 2008
Language en - English
Page Count 16
Revision Level 08
Supercedes
Committee D05.07
Publish Date Document Id Type View
May 15, 2008 D0409-08 Revision
April 10, 2002 D0409-02E01 Revision
April 10, 2002 D0409-02 Revision
Aug. 7, 2000 D0409-97E02 Revision
Oct. 1, 2007 D0409-02R07E01 Reaffirmation