Process of precipitating zirconium or hafnium from spent picklin

Details Process of precipitating zirconium or hafnium from spent picklin Process of precipitating zirconium or hafnium from spent picklin

1990-07-19

1991-12-31

Corbin, Arthur L.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

134 3, 134 13, 210912, 252 793, 423 85, 423488, B44C 122, C23F 146

Patent

active

050768840

ABSTRACT:
A spent pickling solution containing a relatively small percentage of hydrofluoric acid and used for pickling zirconium or hafnium so as to be saturated with zirconium or hafnium fluoride, is treated by the addition thereto of sodium sulfate, Na.sub.2 SO.sub.4, to precipitate sodium zirconium or hafnium fluoride. The remaining solution is recycled for further pickling use, and may have fluoride concentration increased by the addition of calcium fluoride thereto resulting in the precipitation of calcium sulfate.

REFERENCES:
patent: 4105469 (1978-08-01), Megy et al.
patent: 4255407 (1981-03-01), Puurunen
patent: 4330342 (1982-05-01), Fennemann et al.
patent: 4526650 (1985-07-01), Blomquist et al.
patent: 4572824 (1986-02-01), Kim
patent: 4738747 (1988-04-01), Panson
patent: 4927492 (1990-05-01), Panson

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