ASTM D5061-05

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Designation: D 5061 – 05
Standard Test Method for
Microscopical Determination of the Textural Components of
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Metallurgical Coke
This standard is issued under the fixed designation D 5061; 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 liptinite) and semi-inert (semifusinite) coal macerals of metal-
lurgical bituminous coals. During thermoplasticity, the inert
1.1 This test method covers the equipment and procedures
coalmaceralandmineralarepartlyorwhollyincorporatedinto
used for determining the types and amounts of coke carbon
thebinderphase.Also,mostofthecokeporesarelocatedinthe
forms and associated recognizable coal- and process-derived
binder phase.
textural components in metallurgical coke in terms of volume
3.2.3 carbon form, n—microscopically distinguishable car-
percent. This test method does not include coke structural
bonaceous textural components of coke, but excluding mineral
componentssuchascokepores,cokewalldimensions,orother
carbonates.
structural associations.
3.2.3.1 Discussion—Carbon forms are recognized on the
1.2 This standard does not purport to address all of the
basisoftheirreflectance,anisotropy,andmorphology.Theyare
safety concerns, if any, associated with its use. It is the
derived from the organic portion of coal and can be anisotropic
responsibility of the user of this standard to establish appro-
or isotropic.
priate safety and health practices and determine the applica-
3.2.4 circular anisotropic phase, n—a group of binder-
bility of regulatory limitations prior to use.
phase anisotropic carbon textures that are distinguished by
2. Referenced Documents
approximately circular domains (that is length equals width)
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and composed of fine circular (0.5 to 1.0-µm), medium circular
2.1 ASTM Standards:
(1.0 to 1.5-µm), and coarse circular (1.5 to 2.0-µm) size
D 121 Terminology of Coal and Coke
categories.
D 3997 Practice for Preparing Coke Samples for Micro-
3.2.5 coke pore, n—a microscopically distinguishable void
scopical Analysis by Reflected Light
that is a structural element of coke.
3. Terminology
3.2.5.1 Discussion—Coke pores are considered to be nearly
spherical-shaped voids created by the entrapment of gaseous
3.1 Definitions—For additional definitions of terms used in
volatiles during the solidification of thermoplastic coal. How-
this test method, refer to Terminology D 121.
ever, other types of voids can be distinguished in coke that
3.2 Definitions of Terms Specific to This Standard:
include fractures or cracks, interconnected and elongated
3.2.1 anisotropic, adj—exhibiting optical properties of dif-
pores, and the open cell lumens of fusinite and semifusinite.
ferent values when viewed with an optical microscope having
The size and shape of the voids are coal rank and grade, and to
mutuallyexclusivepolarizedlight,forexample,crossednicols.
some degree, process dependent. Pore sizes vary from tens of
3.2.2 binder phase, n—a continuous solid carbon matrix
angstroms to tens of millimetres in any given coke.
formed during the thermoplastic deformation of those coal
3.2.6 coke reactivity, n—a measure of the mass loss when
macerals that become plastic during carbonization.
coke, held at a designated temperature, is contacted with
3.2.2.1 Discussion—The binder phase material is formed
gaseous carbon dioxide over a specific time interval.
from the thermoplastic deformation of reactive (vitrinite and
3.2.7 coke wall, n—a predominantly carbonaceous layer
that encloses a coke pore and which is a structural element and
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This test method is under the jurisdiction of ASTM Committee D05 on Coal
essence of coke.
and Coke and is the direct responsibility of Subcommittee D05.28 on Petrographic
3.2.8 depositional carbon, n—a group of carbon forms that
Analysis of Coal and Coke.
are formed from cracking and nucleation of gas-phase hydro-
Current edition approved May 1, 2005. Published May 2005. Originally
approved in 1992. Last previous edition approved in 2004 as D 5061 - 92 (2004).
carbon molecules during coal carbonization.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.8.1 pyrolytic carbon, n—ananisotropiccarbonformthat
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
is formed by the deposition of carbon parallel to an inert
Standards volume information, refer to the standard’s Document Summary page on
substrate causing the resulting texture to appear ribbon-like.
the ASTM website.
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