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ASTM D 409 Document Information:
Title
Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
ASTM International
Publication Date:
May 15, 2008
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-mm by
600-µm (No. 16 x 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.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses may be
approximate.
It is recognized that the term weight is considered equivalent
to mass as used in this test method.
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.
D05.07.02 on Grindability 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.
Keywords:
- grindability
- Hardgrove-Grindability Index (HGI)
- pulverization
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