Process for the regeneration of a spent solution for pickling zi

Details Process for the regeneration of a spent solution for pickling zi Process for the regeneration of a spent solution for pickling zi

1996-01-24

1998-08-04

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423DIG1, C01G 2300

Patent

active

057889350

ABSTRACT:
A substantial part of the water contained in the spent solution is evaporated under vacuum in an evaporator (7) and is then condensed, so as to obtain slightly acidic water and a concentrated acidic solution polluted by zirconium fluoride ZrF.sub.4. The polluted concentrated acidic solution is treated by evaporation under vacuum in a crystallizer (8), so as to obtain zirconium fluoride ZrF.sub.4 crystals and a purified concentrated acidic solution. The slightly acidic water and the purified concentrated acidic solution are mixed in desired proportions in order to obtain a regenerated pickling solution.

REFERENCES:
patent: 2993757 (1961-07-01), Dasher et al.
patent: 3540513 (1970-11-01), Shinzo et al.
patent: 4144092 (1979-03-01), Krepler
patent: 4255407 (1981-03-01), Puurunen
patent: 4330342 (1982-05-01), Fennemann et al.
patent: 4572824 (1986-02-01), Kim
patent: 4937054 (1990-06-01), Fennemann et al.
patent: 5076884 (1991-12-01), Aguilar et al.

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