Publication Type Journal Article
Title Development of tertiary thioamide derivatives to recover palladium(II) Mark from simulated complex chloride solutions
Authors Osvaldo Ortet A. P. P. Paiva
Groups
Journal HYDROMETALLURGY
Year 2015
Month January
Volume 151
Number
Pages 33-41
Abstract Two thioamide derivatives, N-methyl-N-phenyl-octanthioamide (MPHTA) and N-methyl-N-cyclohexyl-octanthioamide (MCHTA), were synthesized from their amide analogues, adequately characterized, and systematically evaluated as extractants for palladium(II) from chloride media. In sequence of previous research, which revealed the adequacy of both compounds, when dissolved in toluene, to efficiently recover Pd(II) from a wide range of differently concentrated hydrochloric acid solutions, the Pd(II) solvent extraction performance of both MPHTA and MCHTA dissolved in commercial diluents is evaluated in this work. Additionally, results obtained on successive extraction-stripping cycles, involving thiourea as stripping agent, confirm the robustness and stability of these Pd(II) solvent extraction systems, even when commercial diluents are employed. Equilibrium extraction isotherms, obtained for both compounds in toluene, show a high Pd(II) loading capacity. Selectivity data has been collected for complex 4.0 M and 6.0 M HCl mixtures containing two, three, four or five metal ions palladium(II), platinum(IV), rhodium(III), aluminum(III), and iron(III).Fe(III) is the only metal that affects Pd(II) extraction of both MPHTA and MCHTA, as Pd(II) distribution ratios are significantly reduced; on the other hand, the other metals are practically not extracted. These selectivity results are encouraging from a practical point of view, since both extractants may prove suitable to efficiently and selectively recover Pd(II) from hydrometallurgical solutions coming from the leaching of secondary raw material sources. (C) 2014 Elsevier B.V. All rights reserved.
DOI http://dx.doi.org/10.1016/j.hydromet.2014.11.001
ISBN
Publisher
Book Title
ISSN 0304-386X
EISSN 1879-1158
Conference Name
Bibtex ID ISI:000348955100004
Observations
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