1、Designation:D5341/D5341M19Standard Test Method forMeasuring Coke Reactivity Index(CRI)and Coke StrengthAfter Reaction(CSR)1This standard is issued under the fixed designation D5341/D5341M;the number immediately following the designation indicates theyear of original adoption or,in the case of revisi
2、on,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 test method,patterned after the Nippon Steel testprocedure(see Carbonization Research Report 91 and Nis
3、hi etal.2),describes the equipment and techniques used for deter-mining lump coke reactivity in carbon dioxide(CO2)gas atelevated temperatures and its strength after reaction in CO2gasby tumbling in a cylindrical chamber referred to as an I-tester.1.2 The values stated in either SI units or inch-pou
4、nd unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.3 This standard does not
5、 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 standar
6、d 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.Referenc
7、ed Documents2.1 ASTM Standards:3D346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 British Carbonization
8、 Research Association Report:4Carbonization Research Report 91,“The Evaluation of theNippon Steel Corporation Reactivity and Post-Reaction-Strength Test for Coke.”2.3 ISO Standard:5ISO 5725-6:1994 Accuracy of Measurement Methods andResults Part 6:Use in Practice of Accuracy Values3.Summary of Test M
9、ethod3.1 A sample of dried coke of designated origin and size isreacted with CO2gas in a retort at a specified elevatedtemperature for a specified length of time.Two indices,cokereactivity index(CRI)and coke strength after reaction(CSR),are determined using the reacted coke residue.The mass orweight
10、 loss after reaction determines the CRI.The mass orweight retained after sieving the tumbled reacted coke in adesignated number of revolutions over a designated turningrate determines the CSR.4.Significance and Use4.1 When coke lumps descend in the blast furnace,they aresubjected to reaction with co
11、untercurrent CO2and to abrasionas they rub together and against the walls of the furnace.Theseconcurrent processes physically weaken and chemically reactwith the coke lumps,producing an excess of fines that candecrease burden permeability and result in increased coke ratesand lost hot metal producti
12、on.This test method is designed tomeasure indirectly this behavior of coke in the blast furnace.5.Reagents5.1 Nitrogen,with purity greater than 99.9%by volume,dry and with total oxygen and carbon dioxide concentrations ofless than 100 mg/kg.1This test method is under the jurisdiction of ASTM Committ
13、ee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.15 on MetallurgicalProperties of Coal and Coke.Current edition approved Jan.1,2019.Published March 2019.Originallyapproved in 1993.Last previous edition approved in 2018 as D5341/D5341M 18.DOI:10.1520/D5341_D5341M-19.2Nishi,
14、T.,et al.,Journal of the Fuel Society of Japan,Vol 61,No.668,1982,pp.1066-1073.3For 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
15、ASTM website.4Available from British Carbonization Research Association,Chesterfield,Derbyshire,England.5Available 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 In
16、ternational,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 Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.2 Carbon Dioxide,with purity of greater than 99.5%byvolume,dry with an oxygen concentration
