Study on Leaching of Molybdenum from a Spent HDS Catalyst

Abstract:

The aim of this study is to investigate the extraction of molybdenum from the spent HDS catalyst. The experiment was performed by using the pyro-hydrometallurgical process; calcination and leaching. The spent catalyst was calcined at different temperatures in order to investigate the effect of calcination temperature on the recovery of molybdenum in the subsequent process. Leaching of the calcined samples was subsequently performed by using the different concentrations of leaching reagent. The leaching was conducted by varying the concentration of NaCO₃ of 20 g/L, 30 g/L and 40 g/L with a fixed leaching temperature of 90°C, a S/L ratio (weight of calcined sample/volume of leaching reagent) of 100 g/L and leaching time of 1 hrs. under the stirring condition at a speed of 250 rpm. It was found that carbon and sulfur contained in the spent HDS catalyst could be reduced by the calcination process and resulting in enhanced extraction efficiency of molybdenum. The extraction efficiency of molybdenum increased with increasing concentration of leaching reagent. At a certain concentration of leaching reagent, the extraction efficiency of the sample calcined at lower temperatures was higher than the sample which was subjected to calcination at a higher temperature.

• Periodical: Materials Science Forum (Volume 1009)
• Pages: 143-148
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1009.143
• Online since: August 2020
• Authors: Chatisa Kansomket, Thanapon Chandakhiaw, Natthicha Ma-ud, Tanongsak Yingnakorn, Tapany Patcharawit, Sakhob Khumkoa*
• Keywords: Alkaline Leaching, Metal Extraction, Recycling of Metal, Spent HDS Catalyst

References

[1] W. MULAK, A. SZYMEZYCHA, A. LESNIEWICZ, W. ZYNICKI, Preliminary results of metals leaching from a spent hydrodesulfurization (HDS) catalyst, Physical Problems of Mineral Processing, 40 (2006), 69-76.

[2] US EPA (United States Environmental Protection Agency), Hazardous waste management system, Federal Register, 68(202) (2003), 59935-59940.

[3] H.AL. SHEEHA, M. MARAFI, V. RAGHAVAN, M.S. RANA, Recycling and recovery route for spent hydro-processing catalyst waste, Industrial & Engineering Chemistry Research, 52 (2013), 12794-12801.

DOI: 10.1021/ie4019148

[4] A. YARAŞ, H. ARSLANOĞLU, Extraction of selected metals from spent hydrodesulfurization catalyst using alkali leaching agent, Separation Science and Technology, (2019), 1-12.

DOI: 10.1080/01496395.2019.1673412

[5] I.S.S. PINTO, H.M.V.M. SOARES, Recovery of molybdates from an alkaline leachate of spent hydrodesulphurization catalyst - proposal of a nearly - closed process, Journal of Cleaner Production, 52(2013), 481-487.

DOI: 10.1016/j.jclepro.2013.03.021

[6] W.T. MOHAMMED, N.S. ABMEDZEKI, M.F. ABDUNABI, Extraction of valuable metals from spent hydrodesulfirization catalyst by two stage leaching method, Iraqi Journal of Chemical Petroleum Engineering, 12(4) (2011), 21-35.

[7] J. LIU, Z. QIU, J. YANG, L. CAO, W. ZHANG, Recovery of Mo and Ni from spent acrylonitrile catalysts using an oxidation leaching-chemical precipitation technique, Hydrometallurgy, 164 (2016), 64-70.

DOI: 10.1016/j.hydromet.2016.05.003

[8] M. MARAFI, M.S. RANA, Refining waste spent hydroprocessing catalyst and their metal recovery, world academy of science, Engineering and Technology International Journal of Energy and Environmental Engineering, 11(10) (2017), 979-983.

[9] S. NAGIB, R.S.A. HAMEED, Recovery of vanadium from hydrodesulfurization wated catalyst using calix[4] resorcinarenes, Green Chemistry Letter and Review, 10(4) (2017), 210-215.

DOI: 10.1080/17518253.2017.1348543

[10] K.H. PARK, D. MOHAPATRA, C. NAM, Two stage leaching of activated spent HDS catalyst and solvent extraction of aluminium using organo-phosphinic extractant, Cyanex 272, Hazardous Materials, 148 (2007), 287-295.

DOI: 10.1016/j.jhazmat.2007.02.034

[11] K.H. PARK, H.I. KIM, P.K. PARHI, D. MISHRA, C.W. NAM, J.T. PARK, D.J. KIM, Extraction of metals from Mo–Ni/Al2O3 spent catalyst using H2SO4 baking-leaching-solvent extraction technique, Journal of Industrial and Engineering Chemistry, 18 (2012), 2036–(2045).

DOI: 10.1016/j.jiec.2012.05.024