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Solvent extraction and separation of palladium(II) and platinum(IV) from hydrochloric acid medium with dibutyl sulfoxide / Lu Pan in Minerals engineering, Vol. 22 N° 15 (Décembre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 15 (Décembre 2009) . - pp. 1271–1276 Titre : Solvent extraction and separation of palladium(II) and platinum(IV) from hydrochloric acid medium with dibutyl sulfoxide Type de document : texte imprimé Auteurs : Lu Pan, Auteur ; Zu-de Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 1271–1276 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Palladium  Platinum  Dibutyl  sulfoxide  Solvent  extraction  Separation Résumé : The solvent extraction and separation performances of Pd(II) and Pt(IV) from hydrochloric acid solutions were investigated using dibutyl sulfoxide (DBSO) diluted in kerosene. Pd(II) was strongly extracted by a lower concentration DBSO in a lower concentration hydrochloric acid solution while the reverse was obtained for Pt(IV) extraction. Based on independent extraction and separation experiments of Pd(II) and Pt(IV), the separation parameters of Pd(II) and Pt(IV), including dibutyl sulfoxide concentration, contact time of aqueous and organic phases, organic/aqueous (O/A) phase ratio and H+ concentration of aqueous phase, were studied in detail, and the optimal separation parameters were obtained and summarized as the following: dibutyl sulfoxide concentration 0.6–1.2 mol dm−3, organic/aqueous (O/A) phase ratio 0.6–1.0, H+ concentration of aqueous phase 1.0–1.5 mol dm−3 and contact time of two phases 5 min. The as-prepared separation parameters were corroborated by the extraction and separation from a synthetic stock solution containing Pd(II), Pt(IV) as well as several common impurities like Fe(II), Cu(II) and Ni(II). The results revealed that Pd(II) could be separated efficiently from Pt(IV) with a high separation coefficient of Pd(II) an Pt(IV) (2.7 × 104) by predominantly controlling dibutyl sulfoxide and hydrochloric acid concentrations. The extraction saturation capacity of Pd(II) was determined from 1.0 mol dm−3 HCl solution with 3 mol dm−3 dibutyl sulfoxide and its experimental value exceeded 14 g dm−3 under the experimental conditions. Stripping of Pd(II) from loaded organic phase was performed using a mixed aqueous solution containing NH4Cl and ammonia solutes. Pd(II) (99.2%) was stripped using the stripping solution containing 3% (m/v) NH4Cl and 5 mol dm−3 ammonia, respectively. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900171X [article] Solvent extraction and separation of palladium(II) and platinum(IV) from hydrochloric acid medium with dibutyl sulfoxide [texte imprimé] / Lu Pan, Auteur ; Zu-de Zhang, Auteur . - 2010 . - pp. 1271–1276. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 15 (Décembre 2009) . - pp. 1271–1276 Mots-clés : Palladium  Platinum  Dibutyl  sulfoxide  Solvent  extraction  Separation Résumé : The solvent extraction and separation performances of Pd(II) and Pt(IV) from hydrochloric acid solutions were investigated using dibutyl sulfoxide (DBSO) diluted in kerosene. Pd(II) was strongly extracted by a lower concentration DBSO in a lower concentration hydrochloric acid solution while the reverse was obtained for Pt(IV) extraction. Based on independent extraction and separation experiments of Pd(II) and Pt(IV), the separation parameters of Pd(II) and Pt(IV), including dibutyl sulfoxide concentration, contact time of aqueous and organic phases, organic/aqueous (O/A) phase ratio and H+ concentration of aqueous phase, were studied in detail, and the optimal separation parameters were obtained and summarized as the following: dibutyl sulfoxide concentration 0.6–1.2 mol dm−3, organic/aqueous (O/A) phase ratio 0.6–1.0, H+ concentration of aqueous phase 1.0–1.5 mol dm−3 and contact time of two phases 5 min. The as-prepared separation parameters were corroborated by the extraction and separation from a synthetic stock solution containing Pd(II), Pt(IV) as well as several common impurities like Fe(II), Cu(II) and Ni(II). The results revealed that Pd(II) could be separated efficiently from Pt(IV) with a high separation coefficient of Pd(II) an Pt(IV) (2.7 × 104) by predominantly controlling dibutyl sulfoxide and hydrochloric acid concentrations. The extraction saturation capacity of Pd(II) was determined from 1.0 mol dm−3 HCl solution with 3 mol dm−3 dibutyl sulfoxide and its experimental value exceeded 14 g dm−3 under the experimental conditions. Stripping of Pd(II) from loaded organic phase was performed using a mixed aqueous solution containing NH4Cl and ammonia solutes. Pd(II) (99.2%) was stripped using the stripping solution containing 3% (m/v) NH4Cl and 5 mol dm−3 ammonia, respectively. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900171X