PROCESS FOR OBTAINING PURE TUNGSTIC ACID/AND OR MOLYBDIC ACID (WATER SOLUBLE ISOPOLYACIDS) FROM ALCALINE TUNGSTEN AND/OR MOLYBDENUM METAL SALT SOLUTIONS CONTAINING IN PARTICULAR SILICON, PHOSPHORUS, ARSENIC IONS AND THE LIKE IMPURITIES

In this process, the contaminated solution is acidified, the resulting precipitate is filtered off, and tungstic and/or molybdic acid are prepared from the pure solution by electrodialysis, in which the pH necessary for precipitating the ions to be hydrolysed is established by admixing tungstic and/...

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Bibliographische Detailangaben
Hauptverfasser:	VADASDI, KAROLY, BARTHA, LASZLO, OLAH, RUBEN
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS SEPARATION TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	In this process, the contaminated solution is acidified, the resulting precipitate is filtered off, and tungstic and/or molybdic acid are prepared from the pure solution by electrodialysis, in which the pH necessary for precipitating the ions to be hydrolysed is established by admixing tungstic and/or molybdic acid freed from alkali metal ions by means of cation exchange/electrodialysis, a portion of the tungstic and/or molybdic acid recovered after electrodialysis being used again in the purification process.