Method of processing acidic Fe-containing solutions

Details Method of processing acidic Fe-containing solutions Method of processing acidic Fe-containing solutions

1990-02-02

1991-09-24

Cintins, Ivars

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 423139, 423DIG14, B01D 1104

Patent

active

050511866

ABSTRACT:
A method of processing acidic Fe-containing solutions, in particular spent (discarded) pickling solutions, by liquid/liquid extraction with organic ion exchangers wherein the solutions also contain Zn, the contents in Fe and Zn are jointly extracted in a first extraction step, the first organic extract obtained which is charged with Fe.sup.3+, Fe.sup.2+ and Zn.sup.2+ is used for a renewed extraction of fresh solution wherein the Fe.sup.2+ -content of the first extract is exchanged for the Zn.sup.2+ -content of the fresh solution, and that the Zn.sup.2+ -content is separated from the second organic extract by stripping with acid. In particular, the renewed extraction is carried out at a pH value which is changed as compared to the pH value of the first extraction.

REFERENCES:
patent: 4582691 (1986-04-01), Fujimoto et al.
patent: 4678655 (1987-07-01), Twardowski

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