Hydrometallurgical Recovery of Rare Earth Metals from Spent FCC Catalysts

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The recovery of rare earth metals from secondary sources has attracted much attention due to their ever expanding demand in the high-tech industry. The studies reported here focus on the hydrometallurgical recovery of lanthanum and cerium from spent fluid catalytic cracking (FCC) catalysts in a two-step process: leaching with nitric acid and solvent extraction by tri-n-butyl phosphate (TBP) and di(2-ethylhexyl)phosphoric acid (D2EHPA). The experiments show a high dissolution yield of about 93% lanthanum and 42% cerium in a single leaching step with 2 M (126 g/L) HNO3 at 80 °C; only 11% aluminum has been dissolved simultaneously. In the subsequent solvent extraction step the best results for this leach liquor could be achieved using a 1:1 mixture of 25% (v/v) TBP (0.92 M) and 25% (v/v) D2EHPA (0.76 M) in n-decane without the need for any pH adjustment. In that case La(III) and Ce(III) can be extracted with 60% and 74% yield respectively in one stage from the majority of accompanying matrix elements. In particular no extraction of Al(III) could be observed under these conditions.


Original languageEnglish
Title of host publicationRare Metal Technology 2016
EditorsShafiq Alam, Hojong Kim, Neale R. Neelameggham, Takanari Ouchi, Harald Oosterhof
PublisherSpringer, Cham
ISBN (electronic)978-3-319-48135-7
ISBN (print)978-3-319-48616-1
Publication statusPublished - 2016

Publication series

SeriesThe Minerals, Metals & Materials Series (MMMS)

External IDs

WOS 000579352300004
ORCID /0000-0001-6770-4078/work/151982240


Library keywords