fine coal

fine coal
n
that portion of a coal sample being subject to a washability study that is smaller than the predetermined particle size, generally between 2.36 mm (No. 8 USAStandard Sieve Series) and 9.5 mm (3⁄8 in.) round in diameter, which is specified in Test Method D4371.
DISCUSSION — This same particle size breakpoint should then be used in subsequent washability studies of the same material samples from the same location for the same application. This breakpoint is determined by the analyst or the person designing the test procedure as the point that best suits the application. This fine-coal fraction may be further sieved (generally by wet sieving) to produce additional size fractions, each of which is processed through the desired specific gravity solutions. D4371

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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