SOLVENT EXTRACTION OF TUNGSTEN FROM AQUEOUS TUNGSTATE SOLUTIONS

SOLVENT EXTRACTION OF TUNGSTEN FROM AQUEOUS TUNGSTATE SOLUTIONS A process for extracting tungsten values from an aqueous phase into an organic phase, comprises (a) providing an aqueous phase containing tungsten values dissolved therein, and having an initial pH of about 2.2 to about 4.0, (b) providi...

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Bibliographische Detailangaben
Hauptverfasser:	HUGGINS, DALE K, BECKSTEAD, LEO W
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Zusammenfassung:	SOLVENT EXTRACTION OF TUNGSTEN FROM AQUEOUS TUNGSTATE SOLUTIONS A process for extracting tungsten values from an aqueous phase into an organic phase, comprises (a) providing an aqueous phase containing tungsten values dissolved therein, and having an initial pH of about 2.2 to about 4.0, (b) providing an organic phase depleted in tungsten and containing a secondary amine or tertiary amine extractant, a modifier, and the balance a liquid hydrocarbon solvent, (c) extracting tungsten values from said aqueous phase into said organic phase in a plurality of extraction stages operating in countercurrent fashion, and (d) recovering the organic phase enriched in tungsten values and an aqueous raffinate having a pH of about 3.0 to about 4.5.