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1、INTERNATIONA1.STANDARDISO4695editionFifth202140Ironoresforb1.astfurnacefeedstocksDeterminationofthereducibi1.itybytherateofreductionindexMineraisdeferpourchargesdehau1.sfourneauxDeterminationdeIareductibi1.iteapartirdeIaViteSSedereductionISO2021COPYRIGHTPROTECTEDDOCUMENTISO2021IUirhM*hedbdi1.iUedoth
2、erwiseupdhi.o啪InyM1.tta0DmkfifiU81.andonnet8CH-1214Vernier,GenevaPhone：M1.22749O1.11觥曲ite：图洲跳触OQrgPub1.ishedinSwitzer1.andISO2021-A1.1.rightsreserved3划UWt比，角211则！111&Thisdocumentspecifiesamethodtoprovideare1.ativemeasureforeva1.uatingtheextenttoandeasewithwhichthecanbezoneofab1.astironores.Thisdocum
3、entisapp1.icab1.eto1.umpores,sintersandhot-bondedpe1.1.ets.Thefo1.1.owingdocumentsarereferredtointhetextinsuchawaythatsomeora1.1.oftheircontentundatedreferences,theofthisoftheFordateddocumenton1.ytheanyeditioncitedForISO2597-1,rozores-Determinationoftota1.ironcontent-Part1:Titrimetricmethodaftertin(
4、1.1.)ISO2597-2,IronoresDeterminationoftota1.ironcontentPart2:Tithme1.ricmethodsafterISO3082,IronoresSamp1.ingandsamp1.epreparationproceduresISO11323rIronoreanddirectreducedironVocabu1.aryForthepurposesofthisdocument,thetermsanddefinitionsgiveninISO11323app1.y.ISOOn1.inebrowsingp1.atform:avai1.ab1.ea
5、thttps:/www.iso.org/obp4IECPrincip1.eandNz,andtheisoftestportionafixedbed,at9500C,usingreducinggasinterva1.sofCOitsdegreeofreductionreaches65%,Therateofreductionisca1.cu1.atedattheoxygen/ironrat100f0,9.Ify=50%,t1.entheva1.ueof=20,2.Ify=55%,thentheva1.ueOfk=26,59.2Repeatabi1.ityandacceptanceoftestres
6、u1.tsFo1.1.owtheprocedureinAnnexAbyusingtherepeatabi1.ityva1.uesgiveninTab1.e1.Theresu1.tssha1.1.bereportedtotwodecima1.p1.aces.10TestreportThetestreportsha1.1.inc1.udethefo1.1.owinginformation:a) areferencetothisdoment,i.e.ISO4695:2021;b) a1.1.detai1.snecessaryfortheidentificationofthesamp1.e；c) th
7、enameandaddressofthetest1.aboratory；d)thedateofthetest;e)thedateofthetestreport;0thesignatureofthepersonresponsib1.eforthetest；g) tfi?由楠三阳orregardedash) thereducibi1.ityindex,dR/dt(O/Fe=0.9);i) thetota1.ironandiron(1.1.)contentsofthetestportionbeforereduction;j) thereductioncurve,ifspecifiedatthetim
8、eofordering.11VerificationRegu1.archeckingoftheapparatusisessentia1.toensuretestresu1.tre1.iabi1.ity.Thefrequencyofcheckingisamatterforeach1.aboratorytodetermine.Theconditionsofthefo1.1.owingitemssha1.1.bechecked: weighingdevice; reductiontube; temperaturecontro1.andmeasurementdevices; ba1.ance; gas
9、f1.owmeters； purityofgases； recordingsystem; time-contro1.device.IrftQftOMIiendedthatinterna1.referencemateria1.bepreparedandusedperiodica1.1.ytochecktestAppropriaterecordsofverificationactivitiessha1.1.bemaintained.AnnexA(normative)F1.owsheetoftheprocedurefortheacceptanceoftestresu1.tsStartwithinde
10、pendentdup1.icateresu1.ts*=(X1.X2X3)3%=(X1.+X2X3+X4)4x=median(X1.rXKX3tX)*三(Xi*X2)2NOTEForFigMfe,iiF1.owsheetoftheprocedurefortheacceptanceoftestresu1.tsAnnexBDerivationofequationforreducibi1.ityThedegreeofreductiondescribesFFHHria44:WhiChoxygenhasbeenremovedfromironoxides,-86oygenremovedfromironoxi
11、dedegreeofreduction=,origina1.oxygencombinedwithironhematite(Feza1.sowhereas,Thereforejronmateria1.s,Feductjonmagnetite(Fefromwustite(FeO)1andactua1.amountsofFe2O3,Fe3O4andFcOinthesamp1.e.-818100+48111,710048100111,7ddRX100100Qota1.RdRoo1oR100(informative)andisdefinedgenera1.1.yasshownbytheextentto(
12、B1.)Formu1.a(2)isderivedontheassumptionthata1.1.oxygencombinedwithironispresentintheformOfmeta1.1.icironis03)present.mosttheoredegreeofsomeisestimated3O4),the1.ossinmassofthetestportionduringreductionp1.usthedifferencebetweenthetheoretica1.oxygencontentoftheorigina1.samp1.e,basedona1.1.ironbeingasso
13、ciatedasFe2O3,andthetrueoxygencontentbasedonW2mo(B2)Formu1.a(2)isderivedontheassumptionthattherateofoxygenremovedfromironoreisafirst-orderreactiwithrespecttotheprevai1.ingoxygenconcentration.-k=vdt(B3)Ot6段则+%：kgio(130/100)=O,434(te30)0,56tfOCM1.(B8)Inthecaseofhematite,theoxygen/ironrat100f0,9hasthesamemeaningas=40%.BysubstitutingR=dR%OandPurmu1.B.3JayPUFmHa(B6),theva1.ueofdR/dt(atO/Fe=0.9)isobtained:dt60no(BS)ICS73.060.10
