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Separation and Recovery of Fe(III) and Cr(III) from a Tannery Filtrate using Cyanex 272
Abstract
Cyanex 272, diluted in the aliphatic solvent Escaid 110, has been investigated as an extractant for Fe(III) from a sulfate medium. Speciation studies have revealed the presence of and as the major aqueous-phase ferric complexes with the ratio of their contributions being proportional to the concentration of in the aqueous phase. Cyanex 272 behaved like a cation exchanger, and a complex FeR 3 (HR) was formed in the organic phase. Results indicated that this extraction of Fe(III) was reasonably selective over Cr(III) and Zn(II). Complete stripping of the extracted Fe(III) could be achieved by 0.50 mol L -1 H 2 SO 4 . Although at room temperature the kinetics of both the extraction and the stripping processes were slow, they considerably improved at higher temperature. The selectivity of Cyanex 272 has led to the development of a process for the separation and recovery of Fe(III) and Cr(III) from a tannery filtrate. The solvent maintained its capacity after repeated extraction and stripping cycles.
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“Cyanex 272 can selectively extract Fe(III) from sulfate solutions over Cr(III) and Zn(II) or Co(II), Ni(II), Mn(II) in the solution pH range of 1.8 to 2.5, while Cyanex 302 could only separate Fe(III) over Co(II) and Ni(II) [6,44,45].”
From Review on the Comparison of the Chemical Reactivity of Cyanex 272, Cyanex 301 and Cyanex 302 for Their Application to Metal Separation from Acid Media (2020) · cites this paper as [44]
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Metadata
- Authors
- Deep, A., Correia, P. F. M., & Carvalho, J. M. R.
- Affiliations
- Instituto Superior Técnico (PT)
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2006-03-24
- Volume
- 45
- Issue
- 9
- Pages
- 3200-3206
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W1963806223
- Cited by
- 15
- References
- 11
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 1 · 2021: 1 · 2020: 2 · 2019: 1 · 2017: 1 · 2015: 1 · 2014: 1
- FWCI
- 2.57
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Metals and Alloys › Extraction and Separation Processes
- Physical Sciences › Chemical Engineering › Filtration and Separation › Chemical and Physical Properties in Aqueous Solutions
- Physical Sciences › Chemistry › Inorganic Chemistry › Radioactive element chemistry and processing
- Keywords
- Cyanex 272, solvent extraction, iron(III), trivalent chromium, metal separation, sulfate medium, cation exchange, extraction kinetics, extraction selectivity
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