Journal
CATALYSTS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/catal10010061
Keywords
spent catalyst; cobalt recovery; hydrodesulfurization catalyst; leaching; hydrometallurgy; liquid-liquid extraction; Cyanex 272
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Funding
- Ministry of Higher Education and Science, Poland [03/32/SBAD/0910]
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The work presents studies on the application of hydrometallurgical recovery of cobalt(II) from solutions after leaching spent industrial catalysts used in process of hydrodesulfurization. A four-stage process was proposed, which consists of: leaching, precipitation of metal hydroxides accompanying Co(II), extraction of Co(II) with bis(2,4,4-trimethylpentyl)phosphinic acid and Co(II) stripping from the organic phase. The results indicate that by using the proposed method it is possible to leach Co(II) and Mo(VI) from spent catalyst, and remove main impurities such as Al(III), Fe(III) in hydroxide precipitation step and separate Co(II) from Mo(VI) by extraction and stripping.
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