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Separation Science and Technology Volume 56, 2021 - Issue 2
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Stripping of Fe(III) from Aliquat 336 by NaH2PO4: implication for rare-earth elements recovery from red mud

Xuekai ZhangSchool of Metallurgy and Environment, Central South University, Changsha, ChinaView further author information
,
Kanggen ZhouSchool of Metallurgy and Environment, Central South University, Changsha, ChinaView further author information
,
Qingyuan LeiSchool of Metallurgy and Environment, Central South University, Changsha, ChinaView further author information
,
Yan XingSchool of Metallurgy and Environment, Central South University, Changsha, ChinaView further author information
,
Changhong PengSchool of Metallurgy and Environment, Central South University, Changsha, ChinaView further author information
&
Wei ChenSchool of Metallurgy and Environment, Central South University, Changsha, ChinaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-1812-8112View further author information
ORCID Icon
Pages 301-309 | Received 09 May 2019, Accepted 05 Jan 2020, Published online: 10 Jan 2020
 
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ABSTRACT

A new approach was developed using NaH2PO4 as the stripping agent for Fe stripping from Fe-loaded Aliquat 336 during rare-earth elements recovery from red mud leachate. Owing to the strong coordination between Fe3+ and H2PO4‒, Fe mainly exists as FeH2PO42+ at [H2PO4‒] higher than 0.5 M, which can be readily stripped. The results showed a maximum Fe stripping efficiency of 95.5% under optimal condition. Moreover, the extraction capacity of the extractant after stripping was comparable to that of fresh extractant, and decreased only by 2% after 6 cycles, indicating the robustness of this approach for Fe stripping and extractant regeneration.

Additional information

Funding

This work was financially supported by the National Natural Science Foundation of China [No. 21707167], Natural Science Foundation of Hunan Province, China [No. 2017JJ3320], and the Fundamental Research Funds for the Central Universities of Central South University.

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