Process of separation of hafnium from zirconium by molten salt e

Details Process of separation of hafnium from zirconium by molten salt e Process of separation of hafnium from zirconium by molten salt e

1988-05-17

1989-08-15

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

204 64T, 204 71, C25B 124, C25C 326

Patent

active

048571555

ABSTRACT:
A process of separation of hafnium from zirconium by molten salt electrolysis in which zirconium tetrachloride with ordinary hafnium tetrachloride content is dissolved in a molten salt and the zirconium tetrachloride is electrolytically reduced to zirconium trichloride with lower hafnium content at a cathode in the molten salt and hafnium tetrachloride is remained. Next, the cathode on which the zirconium trichloride is formed by the cathode reaction is used as an anode. The electrolytic reduction of zirconium tetrachloride at another cathode in the molten salt is carried out and at the same time the zirconium trichloride formed on the anode is oxidized to zirconium tetrachloride with a low hafnium content and the zirconium tetrachloride is evaporated for separation. The obtained zirconium tetrachloride containing a low hafnium content is suitable for production of reactor grade zirconium containing about 100 ppm of hafnium.

REFERENCES:
patent: 3098805 (1963-07-01), Ervin, Jr. et al.
patent: 3600284 (1971-08-01), Martinez et al.
patent: 4443306 (1984-04-01), Armand et al.
patent: 4588485 (1986-05-01), Cohen et al.
Steinberg, M. A. et al., "Extractive Metallurgy of Zirconium by the Electrolysis of Fused Salts", J.E.C.S., Feb. 1954, vol. 101, #2, pp. 63-78.

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