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C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
C01G27/00—Compounds of hafnium
C01G27/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
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FR572976D1923-08-251923-11-02Procédé de préparation de hafnium et de composés de hafnium en partant de mélanges de composés de hafnium et de zirconium
ExpiredFR572976A
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