ASTM_D_3997_-_D_3997M_-_16.pdf

Designation:D3997/D3997M16Standard Practice forPreparing Coke Samples for Microscopical Analysis byReflected Light1This standard is issued under the fixed designation D3997/D3997M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers laboratory procedures for thepreparation of granular and lump coke into briquette and blocksamples for examination with a reflected light microscope.Thesamples prepared are used for examination and identification ofthe components in coke and the measurement of the reflectanceof coke.NOTE1Sieve size is identified by its standard designation in Speci-fication E11.The alternative designation given in parentheses is forinformation only and does not represent a different standard sieve size1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.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 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 CokeD346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD5061 Test Method for Microscopical Determination of theTextural Components of Metallurgical CokeE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 For additional definitions of terms used in thispractice,refer to Terminology D121.3.1.2 block,npiece of sectioned lump coke or cokedrillcore embedded in sample binder.3.1.3 briquette,ncylindrical block composed of granu-lated coal or coke particles compressed and embedded with anepoxy binder.4.Summary of Practice4.1 Arepresentative sample is crushed to a specified particlesize,oven-dried or after air-drying,mixed with a binder,andformed into a block specimen referred to as a“briquette.”4.2 Alternatively,a sectioned lump of coke,or coke drillcore,oven-dried or after air-drying,is embedded in a suitablebinder and formed into a block specimen referred to as a“block.”4.3 The briquette or block is then polished to a flat,scratch-free surface for microscopical examination under re-flected light.5.Significance and Use5.1 Briquettes and blocks of coke prepared in accordancewith the laboratory procedures of this practice will have flat,scratch-free surfaces suitable for examination with a micro-scope using reflected light illumination.The polished surfaceof the samples prepared using this practice will containparticles representative of the original gross sample.Polishedblocks of coke will preserve the porosity and undisturbeddistributions of carbon forms required in the production ofsequences of stitched and tiled image mosaics.Such images arerequired for microscopic porosity measurement.5.2 Samples prepared by this practice are used for micro-scopical determination of the textural components in coke(seeTest Method D5061)and the measurement of coke reflectance.6.Apparatus6.1 Grinder,Pulverizer,Mill,or Jaw Crusher,or othersuitable equipment for final crushing of the sample to pass a2.36-mm(No.8)U.S.Standard Sieve.1This practice is under the jurisdiction of ASTM Committee D05 on Coal andCoke and is the direct responsibility of Subcommittee D05.28 on PetrographicAnalysis of Coal and Coke.Current edition approved Oct.1,2016.Published October 2016.Originallyapproved in 1992.Last previous edition approved in 2009 as D3997 97(2009).DOI:10.1520/D3997_D3997M-16.2For 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 6.2 Coarse Riffle Sampler,with at least twelve divisions ofnot less than 12.7 mm 12in.and not greater than 19.1 mm34in.6.3 Medium Riffle Sampler,with at least twelve divisions ofnot less than 6.4 mm 14in.and not greater than 12.7 mm12in.6.4 Circular Sample Saw,with a diamond blade at least240 mm 10 in.in diameter,capable of cutting a large piece ofcoke perpendicular to growth lines in one pass.6.5 Drill Press,with a hollow diamond drill bit with aninternal diameter capable of producing cored samples of coke,perpendicular to growth lines.6.6 SievesA 6.4 mm 14in.and 2.36 mm(No.8)U.S.Standard Sieve(see Specification E11)