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Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
Automaticky přeložený název:
Standardní zkušební metoda pro provádění sítové analýzy uhlí a jmenují uhlí velikosti
NORMA vydána dne 1.9.2012
Označení normy: ASTM D4749-87(2012)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.9.2012
Kód zboží: NS-28426
Počet stran: 10
Přibližná hmotnost: 30 g (0.07 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
coal size, sieve, sieve analysis, ICS Number Code 75.160.10 (Solid fuels)
Significance and Use | ||||||||||||||||||||
4.1 This test method concerns the sieving of coal into designated size fractions for the purpose of characterizing the material as to its particle size distribution for further processing or for commercial purposes. This is covered in Part A of this standard. Raw, as well as prepared (crushed, cleaned, or screened), coals can be tested by this test method. 4.2 This test method is applicable for all types of coals, except for pulverized coals (see Method D197) such as fed into steam boilers. Low rank coals, that is, lignites, subbituminous, and high volatile bituminous C, must be dried with caution and handled with care to minimize deterioration or size degradation during sieving. 4.3 This test method is applicable for the wet or dry-sieving of coal at sizes from 200 mm (8 in.) to 38 μm (No. 400 U.S.A. Standard). Methods for sizing materials below 38 μm are outside the scope of this test method. 4.4 This test method also concerns
the designation of a coal sample as to its upper (nominal top-size)
and lower (nominal bottom-size) limiting sizes for the purpose of
characterizing the material for further processing or for
commercial purposes. This is covered in Part B of this test method.
Anthracite coal is further designated by a one word descriptive
term (see 4.5 Enough material may not be
collected by this test method to meet subsequent test procedures,
such as washability analyses (Test Method D4371).
PART A. SIEVE ANALYSIS OF COAL
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1. Scope | ||||||||||||||||||||
1.1 This test method covers procedures for determining the sieve analysis of coal and designating the size of coal from sieve analysis data. Raw as well as prepared (crushed, cleaned or screened) coals can be tested by this test method. 1.2 This test method explains how to designate coal sizes from the results of sieve analysis data in order to represent the condition of the coal as sold. In the case of special mixtures or coals with noncontinuous ranges of sizes, a sufficiently complete sieve analysis must be made to properly describe the size distribution. 1.3 This test method is not applicable for determining the sieve analysis nor for designating the size of pulverized coal. (See Note 1.) Size fractions down to and including 38 μm (No. 400 U.S.A. Standard Series) can be treated by the methods discussed in this test method. Methods for handling size fractions below 38 μm (No. 400) will be developed by this committee. 1.4 The values stated in SI units
are to be regarded as standard. The values given in parentheses are
for information only. The values stated in each system may not be
exact equivalents; therefore, each system must be used
independently of the other, without combining values in any
way.
1.5 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. |
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2. Referenced Documents | ||||||||||||||||||||
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Historická
1.4.2011
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1.11.2013
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1.10.2013
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1.4.2011
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15.11.2011
Historická
1.10.2013
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