ASTM_D_5061_-_19.pdf

Designation:D506119Standard Test Method forMicroscopical Determination of the Textural Components ofMetallurgical Coke1This standard is issued under the fixed designation D5061;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the equipment and proceduresused for determining the types and amounts of coke carbonforms and associated recognizable coal-and process-derivedtextural components in metallurgical coke in terms of volumepercent.This test method does not include coke structuralcomponents such as coke pores,coke wall dimensions,or otherstructural associations.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD3997/D3997M Practice for Preparing Coke Samples forMicroscopical Analysis by Reflected Light2.2 ISO Standard:3ISO 5725-6:1994 Accuracy(Trueness and Precision)ofMeasurement Methods and Results Part 6:Use inPractice of Accuracy Values3.Terminology3.1 DefinitionsFor additional definitions of terms used inthis test method,refer to Terminology D121.3.2 Definitions of Terms Specific to This Standard:3.2.1 anisotropic,adjexhibiting optical properties of dif-ferent values when viewed with an optical microscope havingmutually exclusive polarized light,for example,crossed nicols.3.2.2 binder phase,na continuous solid carbon matrixformed during the thermoplastic deformation of those coalmacerals that become plastic during carbonization.3.2.2.1 DiscussionThe binder phase material is formedfrom the thermoplastic deformation of reactive(vitrinite andliptinite)and semi-inert(semifusinite)coal macerals of metal-lurgical bituminous coals.During thermoplasticity,the inertcoal maceral and mineral are partly or wholly incorporated intothe binder phase.Also,most of the coke pores are located in thebinder phase.3.2.3 carbon form,nmicroscopically distinguishable car-bonaceous textural components of coke,but excluding mineralcarbonates.3.2.3.1 DiscussionCarbon forms are recognized on thebasis of their reflectance,anisotropy,and morphology.They arederived from the organic portion of coal and can be anisotropicor isotropic.3.2.4 circular anisotropic phase,na group of binder-phaseanisotropic carbon textures that are distinguished by approxi-mately circular domains(that is length equals width)andcomposed of fine circular(0.5 m to 1.0 m),medium circular(1.0 m to 1.5 m),and coarse circular(1.5 m to 2.0 m)sizecategories.3.2.5 coke pore,na microscopically distinguishable voidthat is a structural element of coke.3.2.5.1 DiscussionCoke pores are considered to be nearlyspherical-shaped voids created by the entrapment of gaseousvolatiles during the solidification of thermoplastic coal.However,other types of voids can be distinguished in coke thatinclude fractures or cracks,interconnected and elongatedpores,and the open cell lumens of fusinite and semifusinite.The size and shape of the voids are coal rank and grade,and to1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.28 on PetrographicAnalysis of Coal and Coke.Current edition approved March 15,2019.Published June 2019.Originallyapproved in 1992.Last previous edition approved in 2016 as D5061 16.DOI:10.1520/D5061-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from International Organization for Standardization(ISO),ISOCentral Secretariat,BIBC II,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,http:/www.iso.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Tr