Metal valorization from the waste produced in the manufacturing of Co/Mo catalysts: leaching and selective precipitation

  • Mohammed F. Hamza
  • Jean-Claude Roux
  • Eric GuibalEmail author


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.


Hydrodesulfurization 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.

Supplementary material

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Supplementary material 1 (DOCX 4073 KB)


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Copyright information

© Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.C2MA, IMT Mines Ales, Univ. MontpellierAlèsFrance
  2. 2.Nuclear Materials AuthorityCairoEgypt

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