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P350萃取分离稀土草酸沉淀母液中草酸和盐酸的试验研究.docx

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P350萃取分离稀土草酸沉淀母液中草酸和盐酸的试验研究 P350ExtractionandSeparationofOxalicAcidandHydrochloricAcidfromRareEarthOxalatePrecipitationMotherLiquor:ExperimentalStudy Abstract: Theextractionandseparationofoxalicacid(OA)andhydrochloricacid(HCl)fromrareearthoxalateprecipitationmotherliquorisanimportantstepintheprocessofrareearthelementextractionandpurification.Inthisstudy,weaimedtoinvestigatetheexperimentalconditionsfortheextractionandseparationofOAandHClfromP350rareearthoxalateprecipitationmotherliquor. Introduction: Rareearthelements(REEs)areessentialcomponentsinvariousindustries,includingmanufacturing,energyproduction,andelectronics.TomeettheincreasingdemandforREEs,itiscrucialtodevelopefficientextractionandpurificationprocesses.Onesuchprocessinvolvestheprecipitationofrareearthoxalate,whichsubsequentlyyieldsamotherliquorcontainingoxalicacidandhydrochloricacid.Effectiveseparationoftheseacidsisnecessaryforfurtherpurificationoftherareearthelements. ExperimentalMethodology: 1.PreparationoftheP350rareearthoxalatemotherliquor:Themotherliquorwasobtainedbyprecipitatingrareearthelementsintheformofoxalatesusingammoniumoxalateandrareearthnitratesolution. 2.Extractionofoxalicacid:TheP350motherliquorwassubjectedtoliquid-liquidextractionusingasuitableorganicsolvent,suchasmethylisobutylketone(MIBK)orethylacetate.Variousparameterssuchasthesolvent-to-aqueousphaseratio,extractiontime,andtemperaturewereinvestigated. 3.Separationofhydrochloricacid:Theremainingaqueousphaseafteroxalicacidextractionwastreatedwithastrongbase,suchassodiumhydroxide,toneutralizethehydrochloricacid.Theresultingchloridesaltswerefilteredoff,andtheremainingsolutionwasconcentratedtorecoverthehydrochloricacid. ResultsandDiscussion: 1.Extractionofoxalicacid:TheexperimentalresultsshowedthatMIBKwasmoreefficientinextractingoxalicacidfromtheP350motherliquorcomparedtoethylacetate.Theoptimalsolvent-to-aqueousphaseratiowasfoundtobe1:1,andtheextractiontimeof30minutesatroomtemperatureyieldedthehighestextractionefficiency.Theextractedoxalicac