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Iron(II) Transfer to the Organic Phase During Zinc(II) Extraction from Spent Pickling Solutions with Tributyl Phosphate

2005; Taylor & Francis; Volume: 23; Issue: 3 Linguagem: Inglês

10.1081/sei-200056538

1532-2262

Magdalena Regel‐Rosocka, J. Szymanowski,

Radioactive element chemistry and processing

Abstract During Zn(II) extraction with tributyl phosphate (TBP) from hydrochloric acid solutions, the transfer of Fe(II) to the strip solution is observed. A hypothesis on the mechanism of Fe(II) transport is proposed. Measurements of the conductivity of the organic phase suggest a possibility of reverse micelle formation. A significant increase in the conductivity of the organic phase with HCl concentration both in batch and in mixer‐settler experiments is observed. The contribution of Fe(II) oxidation to Fe(III) and then extraction of the latter seems to be insignificant. Owing to the physical transport of iron(II), the metal cation can be effectively scrubbed with water from the loaded TBP. Keywords: Extractionzinc(II)iron(II)tributyl phosphatereverse micellesconductivity Acknowledgment The work was supported by the grant 32‐044/05‐DS.