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Selective sulphide precipitation of heavy metals from acidic polymetallic aqueous solution by thioacetamide / Mahdi Gharabaghi in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 954-963 Titre : Selective sulphide precipitation of heavy metals from acidic polymetallic aqueous solution by thioacetamide Type de document : texte imprimé Auteurs : Mahdi Gharabaghi, Auteur ; Mehdi Irannajad, Auteur ; Amir Reza Azadmehr, Auteur Année de publication : 2012 Article en page(s) : pp. 954-963 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous  solution  Heavy  metal Résumé : The selective separation and recovery of copper, cadmium, zinc, and nickel from a polymetallic solution with sulphide precipitation using thioacetamide have been investigated. Selective metal sulphide precipitation was studied as a function of pH, contact time, and temperature. The results showed that it was possible to separate metals by accurately controlling the pH and temperature. Below pH 2.5, copper precipitation was complete. The cadmium, zinc, and nickel selective precipitations were performed at pH of 4, 5.5, and 7.5, respectively. Temperature also had important effects on the selective separation, and metals precipitation yields increased with increasing temperature. Thioacetamide hydrolysis kinetics and its activation energies in various conditions were calculated. The metal sulphide precipitates were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the results showed that the produced precipitates had high purity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476428 [article] Selective sulphide precipitation of heavy metals from acidic polymetallic aqueous solution by thioacetamide [texte imprimé] / Mahdi Gharabaghi, Auteur ; Mehdi Irannajad, Auteur ; Amir Reza Azadmehr, Auteur . - 2012 . - pp. 954-963. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 954-963 Mots-clés : Aqueous  solution  Heavy  metal Résumé : The selective separation and recovery of copper, cadmium, zinc, and nickel from a polymetallic solution with sulphide precipitation using thioacetamide have been investigated. Selective metal sulphide precipitation was studied as a function of pH, contact time, and temperature. The results showed that it was possible to separate metals by accurately controlling the pH and temperature. Below pH 2.5, copper precipitation was complete. The cadmium, zinc, and nickel selective precipitations were performed at pH of 4, 5.5, and 7.5, respectively. Temperature also had important effects on the selective separation, and metals precipitation yields increased with increasing temperature. Thioacetamide hydrolysis kinetics and its activation energies in various conditions were calculated. The metal sulphide precipitates were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the results showed that the produced precipitates had high purity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476428