Process for regenerating spent pickle liquid containing ZrF.sub.

Details Process for regenerating spent pickle liquid containing ZrF.sub. Process for regenerating spent pickle liquid containing ZrF.sub.

1981-02-26

1982-05-18

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

210712, 210737, 423 72, C23G 136

Patent

active

043303420

ABSTRACT:
A process for regenerating a spent HF-HNO.sub.3 pickle which contains ZrF.sub.4, which comprises heating said spent pickle to above 40.degree. C., adding dissolved NaOH to said so-heated pickle, thereafter cooling said so-treated pickle to a temperature below 20.degree. C. whereby to precipitate Na.sub.2 ZrF.sub.6 and removing said Na.sub.2 ZrF.sub.6 from said so-cooled pickle whereby to regenerate the same.

REFERENCES:
patent: 2743160 (1956-04-01), Wainer
patent: 2812237 (1957-11-01), Wainer
patent: 3048503 (1962-08-01), Foote et al.
patent: 4105469 (1978-08-01), Megy et al.

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