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1、DesulfurizationDeoxidationofMoltenIronwithInSituProducedMagnesiumVapJianYANGMamuKUWABARAZhongzhuLIUKeijiOKUMURAMasamichiSANO(GraduateSchoolofEngineeringNagoyaUniversityNagoyaAichiken4648603Japan)Abstract:Novelhotmetaldes
2、ulfurizationmoltensteeldesulfurizaitondeoxidationprocesseshavebeendevelopedwithmagnesiumvapproducedinsitubyaluminothermicreductionofmagnesiumoxide.Thecheapermagnesiumoxideinsteadofmagnesiummetalisusedasthesecondarysource
3、ofmagnesiumsothatthecostofmagnesiumdesulfurizaitondeoxidationisgreatlyreduced.MgOAlpelletsaregedintoatubewhichisimmersedintothemolteniron.Heatedbyheatconductionfromthemoltenironmagnesiumoxideinthepelletsisreducedbyalumin
4、iumtoproducemagnesiumvapwhichisinjecteddirectlyintothemoltenirontogetherwithArcarriergastoreactwithsulfuroxygendissolvedinit.Thedesulfurizationdeoxidationprocessesareacterizedbyeasysafeoperationlowcostbothofthesulfuroxyg
5、enconcentrationsinthemoltenironcanbequicklydecreasedtoaverylowlevel.TherefiningefficiencyofmagnesiumcanbegreatlyimprovedbyadjustingthemagnesiumpartialpressureintheinjectedbubbletotheoptimumvaluethroughchangingtheArcarrie
6、rgasflowrate.TheMgOinclusionsfmedinthedeoxidationprocessareusuallyverysmall.Meovertheycanberapidlyremovedbyadheringtothesurfaceoftherisingbubbles.Keywds:DesulfurizationDeoxidationMagnesiumvapMgOinclusionsMoltenironAlumin
7、othermicreduction1IntroductionItiswellknownthatmagnesiumisastrongdesulfruizationdeoxidationreagentinironsteelmakingprocesses.12)Asadesulfurizermagnesiumhastheadvantagesthatitcanpromptlyreducethesulfurcontentinhotmetaltoa
8、nultralowlevelthenecessaryamountofslagismarkedlycutdownwhichnotonlyisfavabletotheenvironmentbutalsoreducesthetemperatureduringthetreatment.39)WithmagnesiumasadeoxidationreagenttheMgOinclusionsfmedinthedeoxidationprocessa
9、reusuallysosmallthattheyarenotharmfultothemechanicalpropertiesofsteelproduct.1013)Howeversincethenmalboilingpointofmagnesiumof1380Kismuchlowerthanthetemperatureofironsteelmakingrefiningwithmagnesiumhasthedrawbacksoflowre
10、finingefficiencysafetyproblemduetoviolentmagnesiumvapization.Furthermemetalmagnesiumishighinprice.Inthepresentstudyanewmethodofdesulfurizationdeoxidationofmoltenironwithmagnesiumvapproducedinsitubyaluminothermicreduction
11、ofmagnesiumoxideisproposed.Thecheapermagnesiumoxideinsteadofmagnesiummetalisusedasthesecondarysourceofmagnesiumsothatthecostofdesulfurizaitondeoxidationwithmagnesiumisgreatlyreduced.Pelletsmadeofmixtureofmagnesiumoxideal
12、uminumpowdersaregedintoanimmersiontube.Theproducedmagnesiumvapisinjecteddirectlyintothemelt.Theeffectsofexperimentaltemperaturecarriergasflowrateontherefiningratearestudied.Akiicmodeldescribingtherateofdesulfurizationdeo
13、xidaionwithmagnesiumisproposedtoexplaintheexperimentalresults.Anovelmethodofimprovingtherefiningefficiencyofmagnesiumisproposedbyadjustingthemagnesiummolarratiointhebubbletotheoptimumvaluethroughchangingcarriergasflowrat
14、e.The3(MgO?Al2O3)(s)2Al(l)=3Mg(g)4Al2O3(s)(3)Indertoexpressthedegreeofreductionthereductionefficiencyofmagnesiumoxide(ηRMgO)isintroducedwhichisdefinedastheratioofthereducedMgOmass(WRMgO)totheinitialMgOmassinthepellet(W0M
15、gO).ηRMgO=(WRMgOW0MgO)?100(%)(4)4KiicsofDesulfurizationDeoxidationDesulfurizationdeoxidationwithmagnesiumvapcanbewrittenasMg(g)X=MgX(s)(5)whereXdenotesdissolvedsulfuroxygen.Acommonbasisisrequiredfadetailedkiicanalysisofd
16、esulfurizationofmoltenirondeoxidationofmoltensteelwithmagnesiumvapproducedinsitubyaluminothermicreductionofmagnesiumoxide.Intheseprocessesthedesulfurizationdeoxidationsitesareassumedonthebubblesurfacetheratecontrollingst
17、epsarethemasstransferofthegaseousmagnesiumthedissolvedmagnesiumX(sulfuroxygen)tothebubblesurface.Theotherassumptionsareasfollows:ThecontentofXthetemperatureinmeltareunifm.Thebubbleisofsphericalshapethereisnodisintegratio
18、ncoalescenceduringtherisingprocessofbubbles.Onthebasisoftheaboveassumptionsonecanobtainthefollowingequationsfasinglebubble.(6))(RddiMgMgMggBMgPPATktn???(7))[%X]([%X]100ddiXmXlX???MρAktn(8))][%Mg%Mg]([100ddMgmMgllMgiMρAkt
19、n???wherenxnMglarethenumberofmolesofsulfuroxygenmagnesiuminthemeltnMgBisthenumberofmolesofmagnesiuminthebubbleklXklMgarethemasstransfercoefficientsofsulfuroxygenmagnesiuminthemeltkgMgisthemasstransfercoefficientofmagnesi
20、uminthebubble[%X][%X]iarethesulfuroxygenconcentrationsinthemeltonthebubblesurface[%Mg][%Mg]iarethemagnesiumconcentrationsinthemeltonthebubblesurfacePMgPMgiarethemagnesiumpartialpressuresinthebubbleonthebubblesurfaceMXMMg
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