Characterisation of metalfix-chelamine and its application in precious metal adsorption

Citation
M. Iglesias et al., Characterisation of metalfix-chelamine and its application in precious metal adsorption, SOLVENT EXT, 18(5), 2000, pp. 965-979
Citations number
24
Categorie Soggetti
Chemistry
Journal title
SOLVENT EXTRACTION AND ION EXCHANGE
ISSN journal
07366299 → ACNP
Volume
18
Issue
5
Year of publication
2000
Pages
965 - 979
Database
ISI
SICI code
0736-6299(2000)18:5<965:COMAIA>2.0.ZU;2-T
Abstract
The physical and chemical characteristics of the chelating resin Chelamine, which contains a pentamine ligand, are investigated in order tb consider i ts application in the separation of precious metals. Adsorption isotherm ex periments for Pt, Pd and Au and kinetic experiments were carried out under batch procedures. The resin presents a high level of adsorption selectivity for Pt(IV), Au(III) and Pd(II) giving a capacity of 2.8 mmol/g, 3.1 mmol/g and 2.0 mmol/g respectively. Acidic solutions, complexing agents, lipophil ic anions and ammonia were used for metal elution. NaClO4 solutions are the most effective eluting agents for Pt(IV) while thiourea is the best slippi ng agent for both Pd(II) and Au(III). Selective separation of the three met als can be achieved by sequential elution from the resin with NaClO4 soluti ons in different HCl concentrations and thiourea 0.5 M.