Cyanex 301에 의한 Am(III)과 Eu(III)의 상호분리

양한범; 임재관; 이일희; 유재형

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.1, 143-147, February, 1999

Export Citation

Cyanex 301에 의한 Am(III)과 Eu(III)의 상호분리

Mutual Separation of Am(III) and Eu(III) by Solvent Extraction with Cyanex 301

양한범, 임재관, 이일희, 유재형

초록

S 주개원자를 함유한 산성계 추출제인 Cyanex 301를 사용하여 NaNO₃ 매질에서 Am과 Eu의 추출 및 상호분리 거동에 대해 고찰하였다. Cyanex 301에 대한 Eu와 Am의 추출거동은 매우 유사하여 상호분리할 수 없었으나, Cyanex 301을 8M NaOH로 비누화 처리한 결과 NaNO₃ 매질에서 Eu에 대한 Am의 선택성이 크게 증가하였다. 그리고 Am과 Eu의 상호 분리계수는 Cyanex 301의 비누화율, 수용상의 pH 및 Eu 농도가 높을수록 증가하였다. 비누화 처리하여 얻은 불균일한 Cyanex 301을 균일한 추출제를 얻기 위하여 옥탄올을 첨가하는 전처리 방법을 사용한 경우와 여과 전처리 방법을 사용한 경우 Am과 Eu의 최대 분리계수는 각각 32.3과 930을 얻었다. 그리고 Cyanex 301에 추출된 Am과 Eu은 동일한 역추출 거동을 보였으며, pH 1.3인 1M NaNO₃ 용액에 의해 96.1%, 그리고 0.05 M DTPA/1.5 M Lactic acid 혼합용액에 의해서 99% 이상 역추출되었다.

The present paper describes the solvent extraction behaviors and the mutual separation of Am and Eu by sulphur bearing Cyanex 301 acidic extractant in sodium nitrate solutions. Original Cyanex 301 was not able to separate the Am and Eu because of their similar extraction behaviors. The saponification of commercial Cyanex 301 was performed by small amounts of 8 M NaOH solutions and saponified Cyanex 301 was able to separate of Am from Eu with high selectivity in sodium nitrate aqueous solution. The separation factors (SF _Am/Eu) were increased with saponified ratio of commercial Cyanex 301, pH of sodium nitrate solution and initial concentration of Eu. To obtain the homogeneous saponified Cyanex 301, heterogeneous saponified Cyanex 301 was treated with addition of octyl alcohol or filtration. The observed SF_Am/Eu was 32.3 for the former and 930 for the latter. Finally, the stripping behaviors of Am and Eu were similar and stripping yields showed 96.1% for the 1 M NaNO₃ (pH=1.3) and 99% for the mixture solution of 0.05 M DTPA and 1.5 M lactic acid.

Keywords:Cyanex 301;Solvent Extraction;Am;Eu Separation

[References]

Partitioning and Transmutation Expert Group of NEA (Ed.), "Status and Assessment Report on Actinide and Fission Product Partitioning and Transmutation," Final Draft, June, NEA/PTS/DOC(98)4 (1998)
Rydberg J, Musikas C, Choppin GR, "Principle and Practices of Solvent Extraction," Marcel Dekker Inc., New York (1992)
Yang HB, Lee EH, Lim JK, Yoo JH, Park HS, J. Korean Ind. Eng. Chem., 7(1), 153 (1996)
Yang HB, Lim JK, Yoo JH, "Partitioning of Minor Actinides from Rare Earths by Solvent Extraction with DEHPA," 4th OECD/NEA International Exchange Meeting on Partitioning and Transmutation Technology, Sept. 11-14, Mito, Japan (1996)
Yang HB, Lee EH, Lim JG, Kim JG, Kim JS, Yoo JH, J. Korean Ind. Eng. Chem., 8(6), 1006 (1997)
Zhu Y, Chen J, Jiao R, Solvent Extr. Ion Exch., 14, 61 (1996)
Zhu Y, Chen J. Jiao R, Global 97, Intern. Conf. on Future Nuclear Systems, Yokohama, Japan, Oct. 5-10, 581 (1997)
Modolo G, Odoj R, J. Radioanal. Nucl. Chem., 228, 83 (1998)
Hill C, Madic C, Baron P, Ozawa M, Tanaka Y, Global 97, Intern. Conf. on Future Nuclear Systems, Yokohama, Japan, Oct. 5-10, 1490 (1997)

[Referenced By]

[1] Partitioning and Transmutation Expert Group of NEA (Ed.), "Status and Assessment Report on Actinide and Fission Product Partitioning and Transmutation," Final Draft, June, NEA/PTS/DOC(98)4 (1998)

[2] Rydberg J, Musikas C, Choppin GR, "Principle and Practices of Solvent Extraction," Marcel Dekker Inc., New York (1992)

[3] Yang HB, Lee EH, Lim JK, Yoo JH, Park HS, J. Korean Ind. Eng. Chem., 7(1), 153 (1996)

[4] Yang HB, Lim JK, Yoo JH, "Partitioning of Minor Actinides from Rare Earths by Solvent Extraction with DEHPA," 4th OECD/NEA International Exchange Meeting on Partitioning and Transmutation Technology, Sept. 11-14, Mito, Japan (1996)

[5] Yang HB, Lee EH, Lim JG, Kim JG, Kim JS, Yoo JH, J. Korean Ind. Eng. Chem., 8(6), 1006 (1997)

[6] Zhu Y, Chen J, Jiao R, Solvent Extr. Ion Exch., 14, 61 (1996)

[7] Zhu Y, Chen J. Jiao R, Global 97, Intern. Conf. on Future Nuclear Systems, Yokohama, Japan, Oct. 5-10, 581 (1997)

[8] Modolo G, Odoj R, J. Radioanal. Nucl. Chem., 228, 83 (1998)

[9] Hill C, Madic C, Baron P, Ozawa M, Tanaka Y, Global 97, Intern. Conf. on Future Nuclear Systems, Yokohama, Japan, Oct. 5-10, 1490 (1997)