堿金屬添加劑在碳熱還原過程中的催化行為

1、東北大學碩士學位論文堿金屬添加劑在碳熱還原過程中的催化行為姓名：吳劍輝申請學位級別：碩士專業(yè)：有色冶金指導教師：孫康2000.8.1東北大學碩士論文Abstract堿金屬添加劑在碳熱還原過程中的催化行為AbstractOnthebasisofwideinvestigationofrelatedliteraturesinrlovativestudywasperformedonthecatalyticbehaviorofalkalichlo

2、ridesduringthecarbotllermicreductionofpreoxidizedihneniteinthisdissertationThroughalargenumberofexperimentsanddetailedanalyses、anewmechanismwhichdifiersfromtheprecedentones，wasputforwardThecatalyticeffectsofalkaliaddifiv

3、eswereinvestigatedwithathermogravimetricanalyticsystem，whichwasdesignedtobecomputermonitoredTherelativeorderandinfluencingfactorsofcatalyticeffectsweredeterminedExperimentalresultsshowthat：(!)alkalichloridescanremarkably

4、acceleratethecarbothermicreductionofpre—oxidizedilmenite；②thecatalyticeffectenhancesastheamountofalkaliadditivesincreases；⑨underthesameexperimentalconditions，thecatalyticeffectsofdifierentalkaliadditivescanberankedasfoll

5、owsintermsoftheireffectiveness：KCINaClLiClCsCI；@theindependentcatalyticeffectsaremoreeffectivethanthoseoftheirCO—operativecontributionModemtestingmethodssuchasEPMA，XPS，etc，wereemployedtoexaminethephasecomposition，morphol

6、ogyandbindingenergyofthepartiallyreducedproductsThecatalyticmechanismofalkaliadditivesWasclarifiedAnditiSconfirmedthat：①thegaseousphaseproducedbycarbothermicreductionispredominantlyC0aboveBoudouardReactiontemperature；(9t

7、hecarbothermicreductionofpreoxidizedilmeniteproceedstopochemicallyandalkaliionsenrichtheperipheryoftheparticles，someofthementertheparticles；齜lecatalyticeffectofalkalichloridesliesinthattllevdistortthelocalcrystallinestru

8、ctureoftheparticlesofilmeniteoreandgraphite，whichcauseschemicaldislocationsandthereforeenhancestheirreactionactivityandthenspeedsupthecarbothermicreduction，ratherthantheyonlycatalyzetheBoudouardReactionMoreover，thecortes

9、irebehaviorsofrefractorymaterialsundertheconditionsofcarbothermicreductionandalsothee腩ctofalkaliadditiveonthecorrosiveprocessofrefractorymaterials，werestudiedCorrespondinganti—corrosionmeasureswerecarriedoutaccordingtoth

10、eexperimentalresultsAlkaliadditiyescansomewhatcatalyzethecorrosiveprocessofrefractorysamplestoo，whiletheadditionofoxidesofRareEarthintherefractorysamplesiSaneffectivemethodofdeceleratingtheircorrosiverate，andtheadditiono