Extraction properties of trivalent rare earth ions from nitric acid using a triamide-amine extractant

Uchino, Seiko*; Narita, Hirokazu*; Kita, Keisuke*; Suzuki, Hideya*; Matsumura, Tatsuro ; Naganawa, Hirochika* ; Sakaguchi, Koichi*; Oto, Keisuke*

The extraction of trivalent rare earth ions (RE $^{3+}$ ) from HNO $_{3}$ solution using a triamide amine, tris(N,N-di-2-ethylhexyl-ethylamide)amine (DEHTAA), was conducted, and the extraction mechanism was estimated from extraction behavior of HNO $_{3}$ and RE $^{3+}$ and the relationship between atomic number and extraction percentages (E%) for RE $^{3+}$ . A DEHTAA molecule dominantly formed a DEHTAA HNO $_{3}$ at 1.0 M HNO $_{3}$ and a DEHTAA(HNO $_{3}$ ) $_{2}$ at 6.0 M HNO $_{3}$ in the acid-equilibrated organic phase. This would provide the unique dependence of E% for the light RE $^{3+}$ on the HNO $_{3}$ concentration, in which the E% value had a minimum and maximum at 0.5 M and 2 M HNO $_{3}$ , respectively. The results of the slope analyses for the distribution ratios for RE $^{3+}$ suggested that the dominant RE $^{3+}$ complex was RE(NO $_{3}$ ) $_{3}$ DEHTAA(DEHTAA HNO $_{3}$ ) at 1.0 M HNO $_{3}$ . The E% for RE $^{3+}$ decreased from La $^{3+}$ to Lu $^{3+}$ at 1.0 M HNO $_{3}$ ; on the other hand, those increased from La $^{3+}$ to Nd $^{3+}$ at 0.25 M and from La $^{3+}$ to Sm $^{3+}$ and 6.0 M HNO $_{3}$ .

Language	:	English
Journal	:	Solvent Extraction Research and Development, Japan
Volume	:	30
Number	:	1
Pages	:	p.39 - 46
Publication Year/Month	:	2023/00
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Paper URL	:	https://doi.org/10.15261/serdj.30.39
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Keywords	:	溶媒抽出; 希土類元素; 硝酸系; MA分離; 分離変換; 核燃料サイクル
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Article of JAEA R&D Review	:
Cooperating Institute	:	産業技術総合研究所

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Registration No. : AA20220109
JAEA Abstracts No. : 51000482
Paper Submission No. : 26411

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