TREATMENT OF SODIUM TUNGSTATE LEACH LIQUOR CONTAINING DISSOLVED SILICA, PHOSPHORUS, AND FLUORINE IMPURITIES

TREATMENT OF SODIUM TUNGSTATE LEACH LIQUOR CONTAINING DISSOLVED SILICA, PHOSPHORUS, AND FLUORINE IMPURITIES Basic sodium tungstate leach liquor is treated to reduce the concentration dissolved therein of silica, phosphorus and fluorine impurities in a process which comprises providing a small but ef...

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Hauptverfasser:	HUGGINS, DALE K, BECKSTEAD, LEO W, QUENEAU, PAUL B
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:	TREATMENT OF SODIUM TUNGSTATE LEACH LIQUOR CONTAINING DISSOLVED SILICA, PHOSPHORUS, AND FLUORINE IMPURITIES Basic sodium tungstate leach liquor is treated to reduce the concentration dissolved therein of silica, phosphorus and fluorine impurities in a process which comprises providing a small but effective amount of magnesium in the liquor to maximize removal of silica and phosphorus from solution in the liquor while maintaining the liquor temperature between about 60.degree.C and about 100.degree.C and the liquor pH between about 9 and about 11, filtering the liquor, adjusting the liquor pH to between about 6 and about 8 and the liquor temperature to between about 20.degree.C and about 60.degree.C, and then providing a small but effective amount of aluminum hydroxide in the filtered liquor to maximize removal of fluorine from solution in the liquor while maintaining the liquor temperature between about 20.degree.C and about 60.degree.C and the liquor pH between about 6 and about 8.