modified oxygen steelmaking slag to produce cements - part 1 chemical and mineralogical character

1、ModifiedoxygensteelmakingslagtoproducecementsPart1:chemicalmineralogicalacterizationChotoliFC1QuarcioniVA2FredericciC.3VieiraR.E.4oJBF512InstitutodePesquisasTecnolgicasdoEstadodeSoPaulo(IPT)LabatriodeMateriaisdeConstruoC

2、ivilSoPauloBrazil35InstitutodePesquisasTecnolgicasdoEstadodeSoPaulo(IPT)LabatriodeProcessosMetalrgicosSoPauloBrazil4EscolaPolitcnicadaUniversidadedeSoPaulo–DepartamentodeEngenhariaQumicaSoPauloBrazilAbstractThiswkpresent

3、sacterizationofslagcementsmodifiedoxygensteelmakingslagsbypyrometallurgicalprocess.ChemicalanalysisSEMquantitativemineralogicalXRDanalysisusingRietveldmethodwereappliedinslagsslagcementsacterization.Thecombinationofvario

4、usacterizationtechniquesrepresentsaneffectivecontributiontounderstthebehaviofthesenonconventionalcementsmotivateproducerstoreevaluatethedinaryqualitycontrolcurrentlyappliedbyclinkercementmanufacturersusers.Theresultsshow

5、thattheMgbearingROphaseinsteelslagcanbeclassifiedindifferenttypesofFeOMgOCaOMnOvariationscrelateswithpotentialexpansionphenomena.DespiteoftechniqueslimitationselementalmicroanalysisbySEMcontributedtoanagileestimativetoth

6、ehydraulicpotentialofamphousphase.iginalityThemodifiedoxygensteelmakingslagsexhibitchemicalmineralogicalpropertiesnonsimilarwithBOFslagconsideringthatacterizationmethodologiesshouldbeadaptedasafunctionofmineralcompositio

7、namphousphase.Keywds:BOFSCMSEMEDSROphaseamphousphase.1Crespondingauth:.Tel55113767.4143Fax55113767.4060.pilotscalewhereslagswereproducedinametallurgicalreact(PatentapplicationBR10201402350512014)byaddingmodifiersagentsin

8、to300kgofmoltenSSslagcooledbysteelballs(SSM3SSM4SSM5)usingthesametechniquedevelopedpatentedbyPaulWurthcompanywhichhasauthizedIPTbasedonacooperationagreementtoperfmtestsusingthiscoolingconditions(FerreiraoJ.B.etal.2015).2

9、.2.ChemicalanalysisThechemicalcompositionwasobtainedbyXRayFluescence(XRF)usingaPanalyticalMinipalCementfusedbeadswereproducedinClaisseM4fusionmachine.Thisequipmentwascalibratedusingcommercialstardmaterials(BSBASCANMETECR

10、MIPTNHKGNISTSLOVAKCECA).FeOwasacterizedbydichromatetitrimetry(ASTME24610)metallicironaccding(XuZ.etal.2003).Irontrioxidewascalculatedbydifferenceoftotalironironoxidemetalliciron.Freelime(CaOf)wereanalyzedbyBrazilianStard

11、MethodswhichproceduresareanalogoustoASTMC114082.3.XRDqualitativequantitativeanalysisXraydiffraction(XRD)wasappliedfmineralogicalcompositionanalysis.Powdersamplesweremanuallypressedintoa27mmdiametersampleholderperfmedinaR

12、igakuWindmax1000XRaypowderDiffractometerinarotatingsamplestageemployingCuK?radiation40kV20mAstepsizeof0.02o2?timeperstepof2s1divergenceslit.ThemineralsidentificationphasesquantificationbyRietveldmethodwasperfmedinXPertHi

13、ghSceversion3.0d(3.0.4)basedonstarddiffractiondataprovidedbyICDD(InternationalCenterFDiffractionData).2.3.SEMEDSSampleswerecutembeddedinresinpolishedcoveredwithgoldtobeanalyzedbyscanningelectronmicroscopySEM(JEOLJSM6300)

14、.Itwasused10kVofvoltageaccelerationtoavoidgreatperationoftheelectronbeaminthevolumeofthesampleindertominimizeelementalcompositionerrs.Semiquantitativechemicalanalysesofsomepointsareasofthesamplesindertodeterminethecompos

15、itionofcrystallineamphousphaseswerecarriedoutbyenergydispersivespectroscopy(EDS)usingaNanSystemcoupledtotheJEOLmicroscope.Theresultspresentedarethemeanvalueof5points(minimum)feachcrystallineamphousphase.2.4.Amphousphaser

16、eactivityROphasestabilityTheamphousphasereactivitywasestimatedbyempiricalfmulaslinkedtothechemicalcompositionindexrequirementsfgoodperfmanceaccdingseveralauths(KocabaV.2009PalS.C.etal.2003ShiC.etal2005SmolczykH.G.1980Krg

17、erJ.E.SmitM.S.1969LangE.2002WangS.etal1994DronR.1986).ROstabilitywasevaluatedfollowingclassificationestimateinliteraturedata.Qianetal.(2002)presentedexperimentaldatawhichallowestimatingrelationshipbetweendistributionofma

18、inelementsoxidesinMgbearingROphasesbySEMEDXautoclaveexpansionaccdingASTMC151.3.ResultsDiscussion3.1.AboutchemicalmineralogicalcompositionofslagsThechemicalmineralogicalcompositionsoftheslagsareshowninTables123.Accdingche

19、micalresults(Table1)itisobservedthatrefusedBFSSSslagsshowedcontentofelementssimilarofiginalslagsbutthosemodifiedslagsshoweddifferentcontentsofmaincomponentssuchasFeSiAl.MineralogicalcompositionofiginalrefusedBFSaresimila

20、rwhereasmodifiedslagsrefusedSSshowedmineralogicalcompositiondifferentthaniginalSSslag(Tables23).Theprincipalbasicityindex(CaOSiO2)ofsteelslagscrystallinefractionwithoutROAFphasesaresimilar(Table4)despiteofvariationsofROA