Towards the Circular Economy of Rare Earth Elements: Lanthanum Leaching from Spent FCC Catalyst by Acids

Processes

卷:9

Enrico Catizzone¹  Massimo Morgana¹  Assunta Romanelli¹  Giacobbe Braccio¹  Alessandro Blasi¹  Corradino Sposato¹  Girolamo Giordano²  Massimo Migliori²  Marilena Forte² 

[1] ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Trisaia Research Centre, I-75026 Rotondella, MT, Italy;

[2] Laboratory of Catalysis and Industrial Chemistry, University of Calabria, Via P. Bucci, I-87036 Rende, CS, Italy;

关键词: rare earth elements;    FCC catalyst;    acid leaching;    REE recycling;   

DOI  :  10.3390/pr9081369

来源: DOAJ

【 摘 要 】

Rare earth elements (REEs) are strategic materials widely used in different applications from Information and Communication Technologies (ICT) to catalysis, which are expected to grow more in the future. In order to reduce the impact of market price and reduce the environmental effect from soil extraction, recovery/purification strategies should be exploited. This paper presents a combined acid-leaching/oxalate precipitation process to recover lanthanum from spent FCC catalyst using nitric acid. Preferred to hydrochloric and sulphuric acid (preliminary assessed), HNO₃ showed a good capability to completely leach lanthanum. The combination with an oxalate precipitation step allowed demonstrating that a highly pure (>98% w/w) lanthanum solid can be recovered, with a neglectable amount of poisoning metals (Ni, V) contained into the spent catalyst. This could open a reliable industrial perspective to recover and purify REE in the view of a sustainable recycling strategy.

【 授权许可】

Unknown