Metal valorization from the waste produced in the manufacturing of Co/Mo catalysts: leaching and selective precipitation
- 82 Downloads
Two different strategies have been designed for the acid and alkaline leaching steps of hydrodesulphurization catalysts. Tests have been performed on out-of-range catalysts issued from catalyst manufacturing process. Experimental conditions have been screened for these different processes considering the effects of concentration, temperature, solid/liquid ratio, etc. The best conditions have been used for producing two leachates that were treated by precipitation for recovery of valuable metals such as cobalt and molybdenum. Post-treatments have also been designed for the selective separation of Co from Mo: X-ray diffraction analyses on selective precipitates (as sulfide) confirm the purity of produced materials. Two flow sheets are proposed that allow selectively recovering more than 95% of the valuable metals.
KeywordsHydrodesulfurization catalyst Co and Mo selective recovery Alkaline leaching Acidic leaching Sulfide precipitation
Authors acknowledge the financial support of French Government (Institut Français d’Egypte, French Embassy in Egypt) through the fellowship granted to M.F. Hamza.
- 17.Alonso F, Ramirez S, Ancheyta J, Mavil M (2008) Alternatives for recovering of metals from heavy hydrocarbons spent hydrotreating catalysts a case of study. Rev Int Contamin Amb 24(2):55–69Google Scholar
- 30.Habashi F (1997) Handbook of extractive metallurgy. Wiley-VCH, WeinheimGoogle Scholar
- 40.Schortmann WE, DeSesa MA (1958) Kinetics of the dissolution of uranium dioxide in carbonate-bicarbonate solutions. In:; National Lead Co., Inc. Raw Materials Development Lab., Winchester, Mass. page(s): 17, Medium: XGoogle Scholar
- 41.Beverly RG, Charles WD (1958) Pilot Plant alkaline leaching of uranium ores. US Government Printing OfficeGoogle Scholar
- 44.Merritt RC (1971) The Extractive Metallurgy of Uranium. Colorado School of Mines Research Institute, [GoldenGoogle Scholar
- 45.Ferella F, Ognyanova A, De Michelis I, Taglieri G, Veglio F (2011) Extraction of metals from spent hydrotreating catalysts: Physico-mechanical pre-treatments and leaching stage. J Hazard Mater 192(1):176–185Google Scholar
- 46.Svehla G (1996) Vogel’s qualitative inorganic analysis. Addison Wesley Longman Ltd, HarlowGoogle Scholar
- 50.Shapiro L (1975) Rapid analysis of silicate, carbonate, and phosphate rocks. In: U.S. Geol. Surv. Bull., Vol. 76, pIII, Report Number 1401, pp. 88Google Scholar
- 51.Baes CF Jr, Mesmer RE (1976) Hydrolysis of cations. Wiley, New YorkGoogle Scholar