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ASTM D409/D409M

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

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Organization: ASTM
Publication Date: 1 September 2016
Status: active
Page Count: 15
ICS Code (Coals): 73.040
scope:

This test method2 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)].

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 × 0.60 mm (No. 16 × 30) (see Test Method D4749) materials used for the test. Therefore, the repeatability and reproducibility cited in this test method may not apply for these highvolatile bituminous, subbituminous, and lignite coals.

The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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.

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.

2 For information concerning the experimental work on which this test method is based, see paper by Hardgrove, R. M., "Grindability of Coal," Transactions, American Society of Mechanical Engineers, Vol 54, F.S.P., p. 37, 1932.

D05.07 on Physical Characteristics on Coal is conducting ongoing investigations in regard to quality control during preparation, distribution, and use of standard reference materials and during preparation and testing of actual samples.

 

Document History

ASTM D409/D409M
September 1, 2016
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
October 1, 2012
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
October 1, 2012
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
December 1, 2011
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
December 1, 2011
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
April 1, 2011
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
November 1, 2009
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
November 1, 2009
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
May 1, 2009
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
May 15, 2008
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
April 10, 2002
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
April 10, 2002
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
This test method2 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...
April 10, 2002
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
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...
November 10, 1997
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
1. Scope 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...
April 15, 1993
STANDARD TEST METHOD FOR GRINDABILITY OF COAL BY THE HARDGROVE-MACHINE METHOD
A description is not available for this item.
January 1, 1993
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
A description is not available for this item.
February 15, 1992
STANDARD TEST METHOD FOR GRINDABILITY OF COAL BY THE HARDGROVE-MACHINE METHOD
A description is not available for this item.
February 22, 1991
STANDARD TEST METHOD FOR GRINDABILITY OF COAL BY THE HARDGROVE-MACHINE METHOD
A description is not available for this item.
July 16, 1990
STANDARD TEST METHOD FOR GRINDABILITY OF COAL BY THE HARDGROVE-MACHINE METHOD
A description is not available for this item.
December 9, 1985
STANDARD TEST METHOD FOR GRINDABILITY OF COAL BY THE HARDGROVE-MACHINE METHOD
A description is not available for this item.

References

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