Zirconium-hafnium separation process

Details Zirconium-hafnium separation process Zirconium-hafnium separation process

1989-05-23

1993-01-05

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423 73, C22B 3410, C01G 2500, C01G 2700, B01D 1102

Patent

active

051768780

ABSTRACT:
A process for separating zirconium values from hafnium values wherein an aqueous solution of ZrCl.sub.4 and HfCl.sub.4 is contacted with NH.sub.4 SCN, feeding the resultant solution into a solvent extraction system containing aqueous HCl and MIBK, separating off the solvent phase containing MIBK, HSCN, hafnium thiocyanate complex, and any decomposition products of HSCN to leave the aqueous phase raffinate containing NH.sub.4 Cl, zirconium oxide-chloride and low concentrations of HSCN, scrubbing the hafnium values from the separated solvent phase, treating the scrubbed solvent phase containing MIBK and HSCN with NH.sub.4 OH to convert the HSCN to NH.sub.4 SCN, separating the NH.sub.4 SCN from the treated solvent phase, treating the separated solvent phase to remove essentially all thiazolines, and scrubbing residual HSCN from the raffinate with the desulfurized solvent phase.

REFERENCES:
patent: 2938769 (1960-05-01), Overholser et al.
patent: 3006719 (1961-10-01), Miller
patent: 4202862 (1980-05-01), Jacoby et al.

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