Zirconium-hafnium separation and purification process

Details Zirconium-hafnium separation and purification process Zirconium-hafnium separation and purification process

1989-03-02

1992-11-03

Rosenberg, Peter D.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423 74, 423140, C22B 3400

Patent

active

051604825

ABSTRACT:
A process for the recovery of substantially pure zirconium values from zircon sand which also contains Ra, U, Hf, Pb and other metal values, comprising contacting zircon sand in a chlorinator with a chlorination medium to form an off-gas stream containing chlorides of Zr, Hf, Si, and tract U. The off-gas stream is passed to a condenser to remove volatile Si chlorides and thereby provide a product stream containing condensed chlorides of Zr, Hf and tract U, treating the product stream in acidic aqueous medium in a separation stage to separate the principal Hf values from the principal Zr values. Adjusting the pH of the resulting effluent to between about 3 to about 7 in a second stage to precipitate the trace U values. The residue stream is treated by

REFERENCES:
patent: 2740709 (1956-04-01), Herres

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