SOLVENT-EXTRACTION OF IRON(III) FROM AQUEOUS HYDROCHLORIC-ACID SOLUTIONS USING D2EHPA, PC-88A, CYANEX-272 AND THEIR MIXTURES

Citation
A. Sandhibigraha et al., SOLVENT-EXTRACTION OF IRON(III) FROM AQUEOUS HYDROCHLORIC-ACID SOLUTIONS USING D2EHPA, PC-88A, CYANEX-272 AND THEIR MIXTURES, Scandinavian journal of metallurgy, 25(3), 1996, pp. 135-140
Citations number
27
Categorie Soggetti
Metallurgy & Metallurigical Engineering
ISSN journal
03710459
Volume
25
Issue
3
Year of publication
1996
Pages
135 - 140
Database
ISI
SICI code
0371-0459(1996)25:3<135:SOIFAH>2.0.ZU;2-6
Abstract
Background/purpose. D2EHPA, PC-88A and cyanex-272, the phosphoric acid based solvents are widely used in the solvent extraction of non-ferro us, nuclear and other metals. However, information on their use, espec ially the latter two, for iron extraction is limited. As many hydromet allurgical leaching techniques used for recovering non-ferrous metals result in solutions containing the desired metals as well as iron and as solvent extraction is one of the commonly used technique for metal recovery/separation, detailed information on the extraction behaviour of iron with these solvents is very much essential. Methods. Extractio n studies were carried out on laboratory scale using separatory funnel s. The acid concentration was adjusted to the desired value before equ ilibration. The extractants were diluted with kerosene. After phase se paration, iron analysis was carried out by atomic absorption spectroph otometry/titration method. Results and conclusions. Iron extraction wa s found to vary with HCl concentration. The loading capacity of 0.1 M D2EHPA, PC-88A and cyanex-272 was found to be 1.7, 1.3 and 1.8 kg/m(3) respectively. Sodium sulphate and sodium chloride lowered iron extrac tion efficiency, while sodium nitrate enhanced the extraction efficien cy. Synergism was observed with binary mixtures of the extractants.