Partitioning and Hydrolysis of Nb and Ta and Their Implications with Regard to Mineralization-中国期刊网

摘要 K2NbOF5·H2OandK2TaF7werepreparedthroughmeltingNb2O5andTa2O5respectivelywithFHF2·2H2O,followedbyrecrystallizing.ThehydrolysispropertiesofK2NbOF5andK2TaF7weredeterminedagainbyusingarapidlyquenchvessel.Astemperature(from250to550℃)andpressure(from500to1500bars)increase,thedegreeofhydrolysisofbothK2NbOF5andK2TaF7willincrease.Nb-andTa-fluorinecomplexcompoundsareinstableinsupercriticalaqueousfluids.ThedegreeofhydrolysisofbothK2NbOF5andK2TaF7decreaseswithincreasingconcentra-tionofHF,independentoftheconcentrationofNaF.ThepartitioncoefficientsofNbandTabetweengraniticmeltandfluidphasearelessthan0.15,ie.,mostofNbandTaareleftingraniticmelt.ThepartitioncoefficientofTaismoredependentontheconcentrationofHFthanthatofNb.ThesignificanceofhydrolysisinNb-ansTamineralizationisalsodiscussedinthepresentpaper.

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Partitioning and Hydrolysis of Nb and Ta and Their Implications with Regard to Mineralization

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Partitioning and Hydrolysis of Nb and Ta and Their Implications with Regard to Mineralization

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