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1、Studyonvolatilityofmanganesemetalinreductionprocessofmanganeseoreself-reductionpelletsathightemperature#51015202530XUEZheng-liang,ZHANGBo,YUYue,DONGJiang*(KeyLaboratoryforFerrousMetallurgyandResourcesUtilizationofMinistryofEducation,WuhanUniversityofScienceandTechnolo
2、gy,Wuhan430081,China)Abstract:InordertostudythethermodynamicandkineticsofMnvolatilizationinthereductionprocess,theself-reductionexperimentofcarbon-mixedmanganeseorepelletswasperformedincarbontubefurnaceathightemperature.TheresultsshowthattheMnequilibriumvaporpressurebec
3、omeshigherandtheMnvolatilequantityisincreasingwiththetemperatureincreasing.Amodel,controlledbyboththeinterfacechemistryreactionanddiffusioninsolidproductslayerisestablished.Theapparentactivationenergyofchemicalreactionis192.8kJ/molandtheapparentactivationenergyofinterna
4、ldiffusionis21.94kJ/mol,sothevolatilityofMniscontrolledbythechemicalreactionrate.Keywords:ferrousmetallurgy;volatilityofMn;Mnself-reductionpellet;thermodynamic;kinetics0IntroductionSincethebeginningof1990’s,thedirectalloyingtechnologyofmanganeseoreusedinconverterhasbeen
5、studied[1~3].Restrainedbytheimperfectionofpretreatmentofmolteniron,largequantityofconverterslagandsoon,theeconomicbenefitwasn’tsatisfactory.Thereby,XueZhengliangandhiscolleaguesproposeddirectalloyingofMnself-reductionpelletsincombinedblownconverter[4].However,becauseMni
6、svolatileathightemperature,themanganeseyieldinmoltensteelhasbeenlowered.Therefore,thestudyontheevaporationcharacteristicsandrulesofmanganesemetalinthereductionprocessofMnself-reductionpelletsisveryimportant.1ExperimentalMethodTherawmanganeseorecrushedinto10mmindiameteri
7、sheatedto1273K,andthenkeptonfor60minintheatmosphereofN2tofullydecomposecrystalwaterandcarbonate.Thechemicalcompositionofmanganeseoreafterhigh-temperaturetreatmentisshowninTable1.XRDdetectionofthesampleindicatesthatthephaseofmanganeseoreconsistsofMnO(asshownintheFigure.1
8、)andsmallamountofundecomposedMn3O4andFeMnO3.Therefore,itcanbesupposedthatthepresentphaseisjustMnOinmanganeseor
