Method for separating zirconium and hafnium tetrachlorides with the aid of a melted solvent
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United States of America Patent
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Aug 16, 2005
Grant Date -
Sep 4, 2003
app pub date -
Apr 12, 2002
filing date -
Apr 18, 2001
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Abstract
A method of separating zirconium and hafnium tetrachlorides using a solvent comprising firstly an alkaline metallic solvent comprising a salt made up of an alkali metal chloride and an acidic metal chloride A, for example a chloroaluminate or an alkaline chloroferrate, and secondly an acidic metal or metalloid chloride B of acidity that is less than that of the acidic metal chloride A. The acidic metal or metalloid chloride B may be selected from chlorides of Mg, Zn, and Cu. The method may be a continuous separation method by selective absorption of the tetrachloride vapors by the solvent in the substantially or totally molten state.
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