简介:Theformationofsolidsolutioncombinedwithtricalciumphosphateanddicalciumsilicatecouldpromoteaconsiderableremovalofphosphorusfromliquidslagtosolidduringhotmetaldephosphorization,andthusthedephosphorizationbyusingmultiphasefluxescouldsignificantlydecreasetheconsumptionoflime.However,thereactionmechanismofmultiphasefluxeshasnotbeenunderstoodclearly.Inthepresentstudy,thephasediagramfortheCaO-SiO2-FeO-P2O5systemhasbeenmeasuredwithcertainoxygenpartialpressureathotmetalpretreatmenttemperature.ComparingwiththeCaO-SiO2-FeOsystem,shrinkageofliquidphaseareaathigherFeOcontentswasobservedat1673Kwithoxygenpartialpressureof9.2×10-11atm.
简介:Amulti-objectiveoptimizationapproachfortherollshiftingstrategyincrossrollingcampaignsofhotstripmillsispresented.Theeffectofdifferentrollshiftingstrategiesonrollwearcontourisstudiedbynumericalsimulation,andtwoevaluationindexes,namelybodysmoothnessandedgesmoothness,areproposed.Theaveragebodysmoothnessandaveragerollingedgesmoothnessofallstripsinarollingcampaignaretakenastheobjectivefunctions,theshiftingpositionsofallwidestripsasthedecisionvariables,andthemulti-objectivemethodofNSGA-Ⅱastheoptimizer.Thusamulti-objectiveoptimizationmodelfortherollshiftingstrategyisbuilt.Thesimulationresultsshowthatworkrollshiftingcanmakewearcontoursmooth,andadish-shapedwearcontourwithoutseverelocalwearcanbeachievedbytherollshiftingstrategywithvaryingstroke.OptimizationexperimentationshowsthatbymeansofNSGA-Ⅱ,agoodPareto-optimalfrontcanbeobtained,whichsuggestsaseriesofalternativesolutionsforrollshiftingstrategyoptimization.Theexperimentationalsoshowsthatthereisaconflictbetweenthetwoobjectives.Finally,applicationcasesconfirmthefeasibilityofthemulti-objectiveapproach,whichcanimprovethestripprofile,reduceedgewavesandextendtherollingmilesofarollingcampaign.