ASTM_D_5061_-_07.pdf

Designation:D506107Standard 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 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD3997 Practice for Preparing Coke Samples for Microscopi-cal Analysis by Reflected Light3.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 to 1.0-m),medium circular(1.0to 1.5-m),and coarse circular(1.5 to 2.0-m)size categories.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 tosome degree,process dependent.Pore sizes vary from tens ofangstroms to tens of millimetres in any given coke.3.2.6 coke reactivity,na measure of the mass loss whencoke,held at a designated temperature,is contacted withgaseous carbon dioxide over a specific time interval.3.2.7 coke wall,na predominantly carbonaceous layer thatencloses a coke pore and which is a structural element andessence of coke.3.2.8 depositional carbon,na group of carbon forms thatare formed from cracking and nucleation of gas-phase hydro-carbon molecules during coal carbonization.3.2.8.1 pyrolytic carbon,nan anisotropic carbon form thatis formed by the deposition of carbon parallel to an inertsubstrate causing the resulting texture to appear ribbon-like.1This 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 Oct.1,2007.Published Ocotber 2007.Originallyapproved in 1992.Last previous edition approved in 2005 as D5061-05.DOI:10.1520/D5061-07.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.8.2 sooty carbon,nan isotropic carbon form com-prised of approximately spherical particles of less than 1-mdiameter sometimes referred to as combustion black.3.2.8.3 spherulitic carbon,na spherical anisotropic car-bon form sometimes referred to as thermal black that is formedby the deposition of carb