Process for regenerating a pickle acid bath

Details Process for regenerating a pickle acid bath Process for regenerating a pickle acid bath

1977-02-11

1978-08-08

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 13, 134 41, B08B 310

Patent

active

041054695

ABSTRACT:
A HF-HNO.sub.3 pickle acid bath for pickling zirconium, zirconium alloys, hafnium, and hafnium alloys is regenerated by adding to the spent pickle acid a sufficient amount of NaF to precipitate out, in the case of zirconium, ZrF.sub.4 as Na.sub.2 ZrF.sub.6. HF and HNO.sub.3 are added to the bath to make up losses and the pickle acid is recycled for use.

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

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