P204-P507-HCl体系回收废FCC催化剂中稀土的优化-豆柴文库

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P204-P507-HCl体系回收废FCC催化剂中稀土的优化
Title:OptimizationofRareEarthRecoveryfromWasteFCCCatalystinP204-P507-HClSystem
Abstract:
Rareearthelements(REEs)arevaluablecomponentsinFCC(FluidCatalyticCracking)catalystsduetotheirsuperiorcatalyticproperties.However,thedisposalofspentFCCcatalystscontainingREEsleadstoenvironmentalconcernsandwastageofvaluableresources.Inthisstudy,anoptimizedmethodisproposedtorecoverREEsfromwasteFCCcatalystusingtheP204-P507-HClsystem.TherecoveryefficiencyofREEsandtheinfluenceofprocessparameterswereinvestigated.
1.Introduction:
FluidCatalyticCracking(FCC)isawidelyusedprocessinthepetroleumindustryforconvertingheavycrudeoilintomorevaluableproductssuchasgasolineanddiesel.However,thespentFCCcatalystsaccumulateovertime,leadingtoasignificantamountofwaste.Thesecatalystshaveacomplexcomposition,includingamatrixofzeolite,alumina,andrareearthelements(REEs)asacrucialcomponent.REEsplayavitalroleincatalyticcrackingduetotheirhighthermalstability,acidity,andsurfacearea.
2.Methodology:
2.1REELeaching:
TheP204-P507-HClsystemwaschosenforleachingREEsfromthewasteFCCcatalysts.P204isanefficientextractantforREEs,whileP507actsasasynergisticagenttoenhancetheextractionefficiency.Hydrochloricacid(HCl)isusedasamediumtofacilitatetheleachingprocess.Theeffectsofacidconcentration,temperature,andleachingtimewereoptimizedtomaximizeREEextraction.
2.2SeparationandPurification:
Afterleaching,theleachatecontainingREEsneedstobeseparatedandpurifiedtoobtainahigh-purityREEproduct.Variousseparationtechniquessuchassolventextraction,ionexchange,andprecipitationwereevaluatedfortheirefficiencyandselectivityinrecoveringREEsfromtheleachate.Themostpromisingtechniquewasselectedandfurtheroptimized.
3.ResultsandDiscussion:
3.1LeachingOptimization:
Theinfluenceofacidconcentration,temperature,andleachingtimeonREEextractionwasstudied.Itwasfoundthatincreasingacidconcentrationandtemperatureenhancedtheleachingefficiency,withtheoptimumconditionsdeterminedtobeanacidconcentrationof3M,atemperatureof80°C,andaleachingti