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Hydrometallurgical treatment for valuable Metals recovery from spent CoMo/Al2O3 catalyst. 1. improvement of soda leaching of an industrially roasted catalyst / Vincent Ruiz in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5295–5306 Titre : Hydrometallurgical treatment for valuable Metals recovery from spent CoMo/Al2O3 catalyst. 1. improvement of soda leaching of an industrially roasted catalyst Type de document : texte imprimé Auteurs : Vincent Ruiz, Auteur ; Eric Meux, Auteur ; Sebastien Diliberto, Auteur Année de publication : 2011 Article en page(s) : pp. 5295–5306 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Metal  Catalyst Résumé : This paper describes the recovery of molybdenum from a spent CoMo/Al2O3 by soda leaching after a roasting step. First, the leaching was performed on a catalyst industrially roasted at 800 °C during 20 min. In order to reach a molybdenum leaching yield higher than 85%, the process was optimized using a 23 design of experiments with parameters such as NaOH amount, leaching time, and temperature. Unfortunately, in the best leaching conditions defined by the factorial design, the leaching yield of molybdenum never exceeded 60% because of an incomplete roasting of the catalyst proved by the X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis of the residue. In a second part, the roasting was investigated on an unroasted catalyst containing 23.9% Al, 11% Mo, 2.9% Co, 7.9% S, and 6.3% C using a central composite design. By changing the thermal treatment conditions (700 °C, 20 min) and performing the best soda leaching conditions (an amount of sodium hydroxide equal to the twice of the required stoichiometry and a leaching time of 4 h at 60 °C), it was possible to extract more than 90% of molybdenum initially present in the catalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102414d [article] Hydrometallurgical treatment for valuable Metals recovery from spent CoMo/Al2O3 catalyst. 1. improvement of soda leaching of an industrially roasted catalyst [texte imprimé] / Vincent Ruiz, Auteur ; Eric Meux, Auteur ; Sebastien Diliberto, Auteur . - 2011 . - pp. 5295–5306. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5295–5306 Mots-clés : Metal  Catalyst Résumé : This paper describes the recovery of molybdenum from a spent CoMo/Al2O3 by soda leaching after a roasting step. First, the leaching was performed on a catalyst industrially roasted at 800 °C during 20 min. In order to reach a molybdenum leaching yield higher than 85%, the process was optimized using a 23 design of experiments with parameters such as NaOH amount, leaching time, and temperature. Unfortunately, in the best leaching conditions defined by the factorial design, the leaching yield of molybdenum never exceeded 60% because of an incomplete roasting of the catalyst proved by the X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis of the residue. In a second part, the roasting was investigated on an unroasted catalyst containing 23.9% Al, 11% Mo, 2.9% Co, 7.9% S, and 6.3% C using a central composite design. By changing the thermal treatment conditions (700 °C, 20 min) and performing the best soda leaching conditions (an amount of sodium hydroxide equal to the twice of the required stoichiometry and a leaching time of 4 h at 60 °C), it was possible to extract more than 90% of molybdenum initially present in the catalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102414d