Abstract
The behavior of zirconium and hafnium in PEG 2000-Na2SO4-HCl aqueous biphasic system has been investigated. The dependences of HCl concentration (0.185-0.55M), extraction temperature (298-318K), and extraction time (5-120min) on distribution ratios have been determined. Extraction of this metals in PEG 2000-Na2SO4-H2SO4 and PEG 2000-Na3Cit-HCl systems has been also studied. The sulfate and citrate complexes of Zr and Hf prefer salt-rich phase in contrast to chloride complexes which pass into PEG rich phase in about 50% (w/w) to the greatest degree in room temperature and at short extraction time. The increase of distribution ratios (D*Zr=3.75, D*Hf=4.31) was observed after addition of water soluble organic ligand - tiron (4,5-dihydroxy-m benzenedisulfonic acid disodium salt). The results obtained in studied conditions are not very useful for the separation of zirconium and hafnium.
| Original language | English |
|---|---|
| Pages (from-to) | 1831-1841 |
| Number of pages | 11 |
| Journal | Separation Science and Technology |
| Volume | 42 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Jun 2007 |
Keywords
- Aqueous biphasic system
- Liquid extraction
- Separation of hafnium and zirconium
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- Process Chemistry and Technology
- Filtration and Separation
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