Process for regenerating a nitric acid-hydrofluoric acid picklin

Details Process for regenerating a nitric acid-hydrofluoric acid picklin Process for regenerating a nitric acid-hydrofluoric acid picklin

1978-01-05

1979-03-13

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 13, 203 48, 210 45, 210 56, 210 71, 423DIG1, B08B 704

Patent

active

041440927

ABSTRACT:
In pickling metal, such as iron, steel, special alloys, or the like, aqueous blends containing hydrofluoric acid and nitric acid are used as pickling solutions; resulting spent pickling solutions are evaporated under controlled conditions, such that the concentrate is supersaturated and contains a predetermined amount of iron; the concentrate is then partially cooled and transferred to a crystallization zone where, under controlled conditions, a crystalline precepitate is formed by cooling the concentrate in two phases; the resulting precipitate is then separated from its mother liquor, and the latter is recycled for use in pickling metals of the aforedescribed type.

REFERENCES:
patent: 2017773 (1935-10-01), Smith et al.
patent: 2993757 (1961-07-01), Dasher et al.
patent: 3048503 (1962-08-01), Foote et al.
patent: 3840646 (1974-10-01), Sugimoto et al.

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