Paper presented at the Solvent Extraction and Ion Exchange Group Symposium “Solvent extraction and ion exchange in hydrometallurgy”, held at Leeds on 4–5 April 1974 on the occasion of the Centenary of the Foundation of the Yorkshire College of Science.
Recovery of zinc, cadmium and mercury (ii) from chloride and sulphate media by solvent extraction†
Version of Record online: 25 APR 2007
Copyright © 1975 John Wiley & Sons, Ltd
Journal of Applied Chemistry and Biotechnology
Volume 25, Issue 5, pages 379–402, May 1975
How to Cite
Rice, N. M. and Smith, M. R. (1975), Recovery of zinc, cadmium and mercury (ii) from chloride and sulphate media by solvent extraction. J. Appl. Chem., 25: 379–402. doi: 10.1002/jctb.5020250508
- Issue online: 25 APR 2007
- Version of Record online: 25 APR 2007
- Manuscript Accepted: 29 NOV 1974
- Manuscript Received: 31 JUL 1974
- General Mills Chemicals Inc.
- Ashland Chemicals Inc.
The extraction of zinc, cadmium and mercury from chloride and sulphate media by solvating extractants, liquid anion and liquid cation exchangers has been reviewed both from the literature and by experiment. The results have been discussed in terms of both practical process possibilities and the use of slope analysis to identify the extracted species. These show that slope analysis cannot give positive unambiguous identification of extraction stoichiometry in systems in which the extracted metal species contains coordinating ligands from the aqueous phase. However, in the extraction of Zn and Cd from sulphate media by di(2-ethylhexyl)phosphoric acid (DEHPA) the extracted species is shown to be an MR2(HR)2 monomer by slope analysis demonstrating its use in simple systems. In the case of amines and solvating reagents such as TBPc and TOPO zinc appears to be extracted from Cl– media as either ZnCl2 or sometimes HZnCl3 whereas Cd and Hg(II) appear to be always extracted as HCdCl3 and HHgCl3 species. The use of aqueous phase complexing by Cl– to improve the separation of Zn and Cd by extraction is clear. Some results are presented for the recovery of zinc from sulphate media by oximes and mercury from sulphuric acid media by amines and DEHPA.