ASTM D2797-07
(Practice)Standard Practice for Preparing Coal Samples for Microscopical Analysis by Reflected Light
Standard Practice for Preparing Coal Samples for Microscopical Analysis by Reflected Light
SIGNIFICANCE AND USE
Briquets of granular bituminous coals and anthracite prepared in accordance with the laboratory procedures of this practice will have flat, scratch-free surfaces suitable for examination with a microscope using reflected light illumination. The polished surfaces of briquettes prepared by this practice will contain particles representative of the original gross sample.
Samples prepared by this practice are used for microscopical determination of the reflectance of the organic components in a polished specimen of coal (Test Method D 2798) and for microscopical determination of the volume percent of physical components of coal (Test Method D 2799).
SCOPE
1.1 This practice covers laboratory procedures for the preparation of granular samples of bituminous coal and anthracite samples for examination with a microscope using reflected light illumination. It does not apply to the preparation of oriented blocks of coal.
1.2 The values stated in SI units shall be considered as standard; and inch-pound units shall be considered as approximate equivalents.
This standard does not purport to address the safety concerns 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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Designation: D 2797 – 07
Standard Practice for
Preparing Coal Samples for Microscopical Analysis by
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Reflected Light
This standard is issued under the fixed designation D 2797; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope The briquet is then polished to a flat, scratch-free surface for
examination by vertical illumination.
1.1 This practice covers laboratory procedures for the
preparation of granular samples of bituminous coal and anthra-
4. Significance and Use
cite samples for examination with a microscope using reflected
4.1 Briquets of granular bituminous coals and anthracite
light illumination. It does not apply to the preparation of
prepared in accordance with the laboratory procedures of this
oriented blocks of coal.
practice will have flat, scratch-free surfaces suitable for exami-
1.2 The values stated in SI units shall be considered as
nation with a microscope using reflected light illumination.
standard; and inch-pound units shall be considered as approxi-
The polished surfaces of briquettes prepared by this practice
mate equivalents.
will contain particles representative of the original gross
1.3 This standard does not purport to address the safety
sample.
concerns associated with its use. It is the responsibility of the
4.2 Samples prepared by this practice are used for micro-
user of this standard to establish appropriate safety and health
scopical determination of the reflectance of the organic com-
practices and determine the applicability of regulatory limita-
ponents in a polished specimen of coal (Test Method D 2798)
tions prior to use.
and for microscopical determination of the volume percent of
2. Referenced Documents physical components of coal (Test Method D 2799).
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2.1 ASTM Standards:
5. Apparatus
D 2013 Practice for Preparing Coal Samples for Analysis
5.1 Grinder, Pulverizer, or Mill, for final crushing of the
D 2234/D 2234M Practice for Collection of a Gross Sample
sample to pass a 850-µm (No. 20) sieve. Mortar and pestle or
of Coal
other equipment suitable for reducing the particle size of a
D 2798 Test Method for Microscopical Determination of
250-g sample that already passes a 4.75-mm (No. 4) sieve until
the Vitrinite Reflectance of Coal
all of it passes a 850-µm (No. 20) sieve (see 6.5).
D 2799 Test Method for Microscopical Determination of
5.2 Coarse Riffle Sampler—a riffle with at least twelve
the Maceral Composition of Coal
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divisions of not less than 12.7 mm ( ⁄2 in.) and not greater than
D 4596 Practice for Collection of Channel Samples of Coal
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19.1 mm ( ⁄4 in.).
in a Mine
5.3 Fine Riffle Sampler—a riffle with at least twelve divi-
E11 Specification for Wire Cloth and Sieves for Testing
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sions of not less than 3.2 mm ( ⁄8 in.) and not greater than 6.4
Purposes
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mm ( ⁄4 in.).
3. Summary of Practice 5.4 Sieves—a 4.75-mm (No. 4) and a 850-µm (No. 20) U.S.
Standard Sieve (SpecificationE11).
3.1 Arepresentativesampleiscrushedtoaspecifiedparticle
5.5 Molds—containerstoholdthecoalbindermixturewhile
size, air-dried, mixed with a binder, and formed into a briquet.
the binder hardens.
5.5.1 The mold shall be capable of withstanding pressures
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This practice is under the jurisdiction of ASTM Committee D05 on Coal and
upto70MPa(10 000psi),andshallbemadeofseparableparts
Coke and is the direct responsibility of Subcommittee D05.28 on Petrographic
so that the briquet can be ejected after it has hardened.
Analysis of Coal and Coke.
5.5.2 Themoldshallbelargeenoughtoprovideaplanearea
Current edition approved Oct. 1, 2007. Published October 2007. Originally
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approved in 1969. Last previous edition approved in 2004 as D 2797 – 2004.
of4cm or more on one side of the briquet. (Designs of
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or 1
suitable 25-mm (1-in.) and 32-mm (1 ⁄4-in.) inside-diameter
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
molds are shown in Fig. 1).
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2797–07
6.1.2 The binder and the hardening process used shall not
react with the coal or the atmosphere or expose the coal to
thermal oxidation.
6.1.3 Under the microscope, the binder shall contrast mark-
edly with constituents being measured when immersed in oil
having an index of refraction of about 1.518.
6.1.4 The binder shall be such that a substantially flat and
scratch-free surface ca
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