Method for separating hafnium and zirconium tetrachlorides

Details Method for separating hafnium and zirconium tetrachlorides Method for separating hafnium and zirconium tetrachlorides

C - Chemistry, Metallurgy

22

B

C22B 34/14 (2006.01) B01D 3/14 (2006.01) B01D 3/40 (2006.01) B01D 5/00 (2006.01) C01G 25/04 (2006.01) C01G 27/04 (2006.01)

Patent

CA 2412622

The invention relates to a method for separating zirconium and hafnium tetrachloride with the aid of a solvent comprising an alkaline metal solvent formed from an alkaline metal chloride salt and an acid metal chloride A, e.g. a chloroaluminate or an alkaline chloroferrate, and a metal chloride or an acid metaloid chloride B, whose acidity value is lower than that of the acid metal chloride A. The metal chloride or acid metalloid chloride B has an acidity value which is lower than that of the acid metal chloride A. The metal chloride or acid metalloid chloride B is preferably chosen from Mg, Zn and Cu chloride. The method can involve separation in a continuous manner, by selective absorption of the tetrachloride vapours by the solvent in a substantially or totally melted state.

L'invention concerne un procédé de séparation des tétrachlorures de zirconium et de hafnium à l'aide d'un solvant comprenant d'une part un solvant métallique alcalin formé d'un sel d'un chlorure de métal alcalin et d'un chlorure métallique acide A, par exemple, un chloroaluminate ou un chloroferrate alcalin et, d'autre part, un chlorure métallique ou métalloïdique acide B, ayant une acidité inférieure à celle du chlorure métallique acide A. Le chlorure métallique ou métalloïdique acide B est de préférence choisi parmi les chlorures de Mg, Zn et Cu. Le procédé peut être un procédé de séparation en continu, par absorption sélective des vapeurs des tétrachlorures par le solvant à l'état substantiellement ou totalement fondu.

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