Separation of Fe(III) and Cr(III) from tannery sludge bioleachate using organophosphorus acid extractants

Separation of Fe(III) and Cr(III) from tannery sludge bioleachate using organophosphorus acid... The presented work focused on extraction and separation of Fe(III) and Cr(III) from tannery sludge bioleachate using di(2-ethylhexyl) phosphoric acid (D2EHPA) as extraction agent; the effect of adding tributyl phosphate (TBP) was also investigated. Leachate containing 3.4 g/L Cr(III) and 2.0 g/L Fe(III) was selected as feed solution. The results indicated that Fe(III) can be completely removed from the leachate under conditions of 5 vol% D2EHPA in kerosene and equilibrium pH 2.2. In addition, the removal efficiency of Fe(III) could be enhanced while the extraction rate of Cr(III) exhibited a decline on adding TBP at above 10 vol%. HCl solution was then used to strip Fe(III) and Cr(III) from the loaded organic. It can be concluded from the stripping experiments that 97 % of the Fe(III) could be recovered using 9 mol/L HCl solution as stripping agent for 20 min. However, the recovery efficiency decreased when adding TBP to the organic, which can be attributed to the isolation of the extraction actions because TBP surrounding effect to D2EHPA. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Separation of Fe(III) and Cr(III) from tannery sludge bioleachate using organophosphorus acid extractants

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Publisher
Springer Netherlands
Copyright
Copyright © 2016 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-016-2764-8
Publisher site
See Article on Publisher Site

Abstract

The presented work focused on extraction and separation of Fe(III) and Cr(III) from tannery sludge bioleachate using di(2-ethylhexyl) phosphoric acid (D2EHPA) as extraction agent; the effect of adding tributyl phosphate (TBP) was also investigated. Leachate containing 3.4 g/L Cr(III) and 2.0 g/L Fe(III) was selected as feed solution. The results indicated that Fe(III) can be completely removed from the leachate under conditions of 5 vol% D2EHPA in kerosene and equilibrium pH 2.2. In addition, the removal efficiency of Fe(III) could be enhanced while the extraction rate of Cr(III) exhibited a decline on adding TBP at above 10 vol%. HCl solution was then used to strip Fe(III) and Cr(III) from the loaded organic. It can be concluded from the stripping experiments that 97 % of the Fe(III) could be recovered using 9 mol/L HCl solution as stripping agent for 20 min. However, the recovery efficiency decreased when adding TBP to the organic, which can be attributed to the isolation of the extraction actions because TBP surrounding effect to D2EHPA.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Oct 18, 2016

References

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