Method for separating zirconium and hafnium

C - Chemistry – Metallurgy – 01 – G

Patent

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C01G 27/04 (2006.01) B01J 41/00 (2006.01) B01J 41/02 (2006.01) C01G 25/04 (2006.01)

Patent

CA 2581510

The invention concerns a method from separating zirconium and hafnium for a mixture of ZrCI4 and HfCI4 containing 3 wt. % or less of Hf based on Zr + Hf, the method including the following steps: 1) hydrolyzing a mixture of ZrCI4 and HfCI4 in an aqueous solution of strong inorganic acid, so as to form an aqueous solution having 7 to 12 moles of acid per liter; 2) passing the solution obtained at step 1) in an anion exchanging resin; 3) optionally eluting a fraction of said aqueous solution having 7 to 12 moles of acid per liter, enriched in hafnium; 4) removing the resin of the acid solution containing Zr and Hf; 5) passing in the resin an aqueous solution to detach the zirconium compounds fixed to the resin, and recovering a zirconium-enriched fraction.

Procédé permettant de séparer le zirconium du hafnium d'un mélange de ZrCI4 et HfCI4 contenant 3 % en poids de Hf exprimé par rapport à Zr + Hf ou moins, le procédé comprenant les étapes suivantes : 1. hydrolyser un mélange ZrCI4 et HfCI4 dans une solution aqueuse d'acide inorganique fort, de manière à former une solution aqueuse ayant de 7 à 12 moles d'acide par litre ; 2. faire passer la solution obtenue à l'étape (1) dans une résine échangeuse d'anions ; 3. éventuellement éluer une fraction de ladite solution aqueuse ayant de 7 à 12 moles d'acide par litre, enrichie en hafnium ; 4. débarrasser la résine de la solution acide contenant Zr et Hf ; 5. faire passer dans la résine une solution aqueuse pour décrocher les composés du zirconium fixés à la résine, et récupérer une fraction enrichie en zirconium.

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