Solvent Extraction of Ti(IV) from Acidic Sulphate Medium by Cyanex 301 Dissolved in Kerosene

Abstract

The solvent extraction of Ti(IV) from sulfate medium by the commercial extractant Cyanex 301 (HA) has been studied in order to examine this novel system. Heptan-1-ol (5% (v/v) in the organic phase) is used as a de-emulsifier. The equilibration time is 45 min. The experimental results suggest that the extracted species is always TiOA_{2 (o)}, though the composition of the reacting aqueous Ti(IV) species may vary depending on the concentration levels of Ti(IV), pH, HA and . The equilibrium constant (K_ex) at 303 K is measured to be 10^1.117 and 10^−1.243 for the reaction of monomeric, non-sulfated, mono, and non-hydrolyzed TiO²⁺, respectively. The effects of heptan-1-ol, temperature, loading, and diluent type have been reported. Stripping can be done effectively by a solution of 1 mol/dm³ H₂SO₄ containing 5%(v/v) of “100 volume” H₂O₂. The possibilities of separation of Ti(IV) from Cu(II), Zn(II), Fe(III), Co(II), and Ni(II) have been predicted. It is proved to be an effective extractant for Ti(IV)/Fe(III) separation from sulphate medium at pH ∼ 1.

Keywords:

• cyanex 301
• equilibrium
• extraction
• sulfate medium
• Ti(IV)

ACKNOWLEDGEMENTS

The authors are grateful to Cytec Canada Inc. for supplying Cyanex 301 as a gift. One of the authors (A. K. Karmakar) acknowledges the National Science Information and Communication Technology (NSICT) Division of the Ministry of Science and Technology, Government of the People's Republic of Bangladesh (Secretariat, Dhaka) for awarding a fellowship to complete this work.

Notes

*NE: non-extractable, CE: complete extraction, *: aqueous solution becomes cloudy before extraction but becomes clear after extraction.

*N.B.: T.W˭This work. Data in italics are extrapolated. *Literature is not available.