| 摘要 |
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 Fe3+, Fe2+ and Zn2+ is used for a renewed extraction of fresh solution wherein the Fe2+-content of the first extract is exchanged for the Zn2+-content of the fresh solution, and that the Zn2+-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.
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