不銹鋼粉塵內(nèi)配煤團(tuán)塊高溫自還原制備含鉻鎳鐵粒的研究.pdf

1、武漢科技大學(xué)碩士學(xué)位論文不銹鋼粉塵內(nèi)配煤團(tuán)塊高溫自還原制備含鉻鎳鐵粒的研究姓名：劉強(qiáng)申請學(xué)位級別：碩士專業(yè)：鋼鐵冶金指導(dǎo)教師：薛正良20120531第1I頁武漢科技大學(xué)碩士學(xué)位論文AbstractThispaperreviewstheadvancedtechnologyofdealingwithstainlesssteeldustathomeandaboard，andsummarizesthecurrentsituationofdire

2、ctreducedironinallovertheworldandtheprospectofcoalbaseddirectreductionprocessinChinaCombinedwimtheactualproductionofsteel，themethodofdustmixedcoal謝t11highbasicity(Wcometprocess)basedonrotaryhearthfurnacesrecyclingstainle

3、sssteeldustcontaining、Ⅳimiron，chromiumandnickelwasproposedneprocessparameterswereresearched111edirectreductionexperimentWasundertakenincarbontubefurnacewitllmghspeedheatingfunctionTheeffectofreductiontemperature，C／Oratio

4、，basicityandadditivesonthetechniquequalificationssuchasslagphasepulverization，ironphaseaggregationandiron，chromiumandnickelyieldTheresultsareshownasfollows：1)whenthebasicity(w(CaO)／w(Si02))ofslagofbriquettesisbetween23an

5、d25，theslagphaseofselfreducedproductcouldbeseparatedfromtheironnuggetsnaturallyduringtheproductcoolingButwhenthebasicityoftheslagphaseislower，moredifficulttheirongranulesgrowup，becauseofthebiggerquantityofslagwhenthebasi

6、cityoftheslagphaseishilghto28，theslagphaseisn’tpulverizingafterdirectreduction，itmaybebecausetheslagphaseisn’tin2CaOSi02area2)RaisedtheC／Omoleratioofstainlesssteeldustcoalmixedbriquettes，theamountofresidualcarboninthesla

7、gincreasesobviouslyandtheexcessivecarbonintheslagwouldpreventthemetallicphasediffusedandaggregatinggrowthIrongranulesaggregateandgrowwellastheC／OmoleiS113)Asthetemperatureincreases，thespongestructureofthedirectreductioni

8、rondisintegratesandtheironnuggetseasilyformThehigherthereducingtemperatureis，themoreeasilytoaggregateandgrowtheironnuggets4)CaF2canmakethesurfacetensionofthemoltenslagdecreasegreatlybutifCaF2quantityistoolarge，itwillincr

9、easetheslagquantitywhichisbadforaggregationandgrowthoftheironnuggets2％ofCaF2additionamountissuitableforthedirectreductionofthestainlesssteeldust5)Improvethemetalcontentofbriquettes，whichwillreduceslagquantitycorrespondin

10、glytheironnuggetsaggregatingandgrowingmoreeasilyAsthecarbonisexcessivemorethan10％，itwillprovideenoughcarbonasreducingagenttoensurethereductionofiron，chromiumandnickel6)Thedesulfurizationanddephosphorizationabilityofreduc

11、tionprocessofhi【ghbasicitystainlesssteeldustcoalmixedbriquettesathilghtemperaturearehighThedesulfurizationrateismorethan94％asthedephosphorizationratebetween45％and65％Ironnuggetswithlowsulfurandphosphoruscontentandhighchro