Process of regenerating spent HF-HNO.sub.3 pickle acid containin

Details Process of regenerating spent HF-HNO.sub.3 pickle acid containin Process of regenerating spent HF-HNO.sub.3 pickle acid containin

1990-11-19

1992-01-21

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

134 13, 134 41, 156664, 156345, B44C 122, C23F 100

Patent

active

050825232

ABSTRACT:
Spent HF-HNO.sub.3 pickle acid containing (ZrF.sub.6).sup.-2 is regenerated by the addition of NaNO.sub.3 to precipitate Na.sub.2 ZrF.sub.6. The Zr.sup.+2 concentration of the pickle acid may be reduced from about 25 gram/liter to about 1 gram/liter with an increase in Na.sub.+ concentration of less than about 200 ppm. The relatively pure pickle acid containing zirconium and sodium may be recycled to pickle zirconium based articles or may be fed to a zirconium recovery process.

REFERENCES:
patent: 3048503 (1962-08-01), Foot
patent: 4105469 (1978-08-01), Megy
patent: 4144092 (1979-03-01), Krepler
patent: 4330342 (1982-05-01), Fennemann
patent: 4526650 (1985-07-01), Blomquist
patent: 4738747 (1988-04-01), Panson

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