مقاله Toward greener comprehensive utilization of bastnaesite: Simultaneous recovery of cerium, fluorine, and thorium from bastnaesite leach liquor using HEH(EHP) : تی پی بین

خلاصه مقاله

This paper describes a novel process for conducting the extraction and recovery of cerium, fluorine, and thorium from a bastnaesite sulfuric leaching solution using HEH(EHP) (2-ethylhexylphosphonic mono-2-ethylhexyl ester) as the solvent, and investigates the effects of HEH(EHP) concentration, the stoichiometric quantity of H₂O₂, and H₂SO₄ concentration in the Th(IV) stripping liquor on extraction quantity and purity. Analysis of the process shows that Ce(III) extraction capacity with HEH(EHP) is negligible, and extraction efficiency for the elements is in order of Ce(IV) > F(I) > Th(IV) ≫ Ce(III). After coordination scrubbing of F(I) with Al(III), Ce(IV) is reductively stripped with H₂O₂ and HCl, allowing recovery of CeO₂ with a purity of 99.95%. Furthermore, this paper provides appropriate technical parameters for industrial application of the extraction system—confirmed by a multistage countercurrent extraction test—showing that this process provides a more environmentally sound integrated separation and recovery flow of rare earths from bastnaesite.

نویسندگان

Liangshi Wang [ National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China ]

Ying Yu [ National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China ]

Xiaowei Huang [ National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China ]

Zhiqi Long [ National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China ]

Dali Cui [ National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China ]

کلمات کلیدی

(Cleaner production Coordination scrubbing Reductive stripping Bastnaesite HEH(EHP

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Chemical Engineering Journal

The Chemical Engineering Journal focuses upon three aspects of chemical engineering: chemical reaction engineering, environmental chemical engineering, and materials synthesis and processing.

حوزه های تحت پوشش : Chemical Engineering