CaO-MgO-SiO2-Cr2O3體系中相平衡研究.pdf

1、山東大學(xué)碩士學(xué)位論文CaOMgOSiO2Cr2O3體系中相平衡研究姓名：楊陽申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：邊秀房20110430山東大學(xué)碩士學(xué)位論文ABSTRACTInpyrometallurgicalprocesses，slagsaleusedtopreventoxidationofthemetalthroughcontactwimairtolimitheatlossesthroughradiationandtorem

2、oveimpuritiesfromthemoltenmetalThethermodynamicsofmoltenslagsisanimportantareainthefieldofprocessmetallurgyInordertooptimizethemetallurgicalprocess，it’SnecessarytoinvestigatethepropertiesofindustrialslagsystemsChromiumis

3、themetalinslagthatisgiventhemostattentionwhenitcomestoleachingSeveraltypesofslagcontainasignificantfractionofoxidizedchromiumThisisespeciallythecaseforferrochromiumandstainlesssteelslagsKnowledgeofthethermodynamicpropert

4、iesofchromiumoxidescontainingslagsisofgreatimportancetochromiumretentioninstainlesssteelproduction，inviewofchromiumimpactsoneconomiccostsandenvironmentalprotectionInthepresentstudyphaseequilibriumofCaOMgOSi02Cr203synthet

5、icslagsystemWasinvestigated111einfluentialfactorsonequilibriumphasesinthissystemsuchasslagbasicityheattreatmentandadditionofA1203werestudied，respectivelyChromiumdistributionphasecompositionandmicrostructuresinthesamplewe

6、reanalyzedusingSEM，XRD，EDStechniquesCalculationresultsfromFactsageTMsoftwarewerealsousedtopredictequilibriuminformationforsomeslagcompositionsItisshownthatacertainamountofspinelphaseprecipitatedinslagsampleswitllbasicity

7、14and16whichwerequencheddirectlyfroml600℃Ⅵrhenbasicityislessthan12，nospinelWasdetectedinthesamplewhilethematrixhadarelativelyllighamountofchromiumatthesametimeSpinelphasealsoprecipitatedinthesampleswitllevenhigherbasicit

8、yButEDSanalysisshowedthattherearcsomecalciumandsiliconimpuritiesinthisphaseInadditionchromiumtendstoformsolidsolutionorcalciumchromatecombinedwithpericlaseandmerwiniteinslags、ⅣitllllighbasicityThisprobablyleadstoleaching