Zr을 함유한 di-(2-ethylhexyl)phosphoric acid에 의한 Am과 Eu의 상호분리(III)

양한범; 이일희; 임재관; 김종구; 김정석; 유재형

Journal of the Korean Industrial and Engineering Chemistry, Vol.8, No.6, 1006-1013, December, 1997

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Zr을 함유한 di-(2-ethylhexyl)phosphoric acid에 의한 Am과 Eu의 상호분리(III)

Mutual Separation of Am and Eu by Solvent Extraction with di-(2-ethylhexyl)phosphoric acid Containing Zirconium(III)

양한범, 이일희, 임재관, 김종구, 김정석, 유재형

초록

방사성 폐액에 존재하는 악티늄족과 란탄족의 대표원소로 Am과 Eu을 각각 선정하여 Zr을 함유한 di-(2-ethylhexyl) phosphoric acid 추출제를 사용하여 회분식으로 이들 원소의 상호분리에 대한 분리특성을 고찰하였다. 0.5M HNO₃에서 Zr을 함유한 1M DEHPA/n-dodecane(Zr 농도:8.7g/ℓ)에 의한 Am 및 Eu의 추출율은 각각 92.3%와 99.1%이었으며, cncnfwp 1M DEHPA/n-dodecane에 함유된 Zr 농도에 비례하여 Am과 Eu의 추출율이 증가하는 상승효과를 보였다. 그리고 pH가 3.0으로 조정된 0.05M DTPA와 1M lactic acid의 혼합용액에 의한 제 1단계 역추출에서는 유기상으로 추출된 Am과 Eu의 38.1% 및 3%가 각각 역추출되었으며, 이때 Am 과 Eu의 분배계수로부터 구한 상호 분리 계수는 14.2였다. 또한 6M HNO₃용액에 의한 제2단계 역추출에서는 제1단계 역추출에서 역추출되지 않고 유기상에 남아 있는 Eu의 94.4%가 역추출되었다.

This study was carried out to elucidate the chemical characteristics of mutual separation for Am and Eu, which were selected as a stand-in from minor actinide and rare earth elements, by solvent extraction with di-(2-ethylhexyl)phosphoric acid containing zirconium at batch system. As results, 92.3% of Am and 99.1% of Eu were coextracted with 1M DEHPA/n-dodecane containing zirconium (Zr concentration = 8.7g/ℓ) at 0.5M HNO₃ in the extraction step. The extraction yields of Am and Eu were proportionally increased with the concentration of Zr in Zr salt of 1M DEHPA/n-dodecane having the synergistic effect. In the lst stripping step for the selective separation of Am, 38.1% of Am and 3% of Eu were stripped with the mixed solution of 0.05M DTPA and 1M lactic acid adjusted pH of 3.0. At that time, the separation factor calculated from the distribution coefficients of Am and Eu was 14.2. In the 2nd Stipping step to remove the Eu remained the organic phase after the lst stripping step, 94.4% 0f Eu was stripped into aqueous phase with 6M HNO₃.

[References]

Yang HB, Lee EH, Lim JK, Yoo JH, Park HS, J. Korean Ind. Eng. Chem., 7(1), 153 (1996)
Lee EH, Yang HB, Kim KW, Lim JG, Yoo JH, J. Ind. Eng. Chem., 3(1), 39 (1997)
Yoo JH, "군분리공정 기술개발," KAERI/RR-1632/95 (1995)
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Stoyanov ES, Mikhailov VA, Petrukhin OM, Shipulo EV, Solvent Extr. Ion Exch., 9, 787 (1991)
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[Referenced By]

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

[2] Lee EH, Yang HB, Kim KW, Lim JG, Yoo JH, J. Ind. Eng. Chem., 3(1), 39 (1997)

[3] Yoo JH, "군분리공정 기술개발," KAERI/RR-1632/95 (1995)

[4] Lee EH, Yang HB, Lim JK, Shin YJ, Yoo JH, J. Korean Ind. Eng. Chem., 6(4), 529 (1995)

[5] Yang HB, Lee EH, Lim JK, Yoo JH, Park HS, 한국 원자력학회 '96 춘계 학술발표회 논문집, Vol.(III), 559 (1996)

[6] Weaver B, J. Inorg. Nucl. Chem., 30, 2233 (1968)

[7] Weaver B, Shoun RR, J. Inorg. Nucl. Chem., 33, 1909 (1971)

[8] Galaktionov SV, Muhin IV, Smelov VS, Shesterikov VN, "Acid Zirconium - Containing Salts of Phosphorus- Organic Acids - The new Effective Extractants for Extraction of Transpoutomium, Rare Earth Personnel Communication,"

[9] Moukhine IV, Smelov VS, "The Comparative Characteristics of Methods Partitioning HLW in Russia for Transmutation of Radionuclides 4th OECD/NEA International Exchange Meeting on Partitioning and Transmutation Technology," 1996. Sep. 11-14, Mito, Japan (1996)

[10] Sistkova NV, Chotivka V, Mobiusova J, J. Inorg. Nucl. Chem., 36, 1135 (1974)

[11] Plesskaya NA, Sinegribova OA, Yagodin GA, Russian J. Inorg. Chem., 22 (1977)

[12] Sinegribova OA, Yagodin GA, Semenov GI, Pukhonto LI, Russian J. Inorg. Chem., 20, 102 (1975)

[13] Stoyanov ES, Mikhailov VA, Petrukhin OM, Shipulo EV, Solvent Extr. Ion Exch., 9, 787 (1991)

[14] Sato T, Nakamura T, J. Inorg. Nucl. Chem., 33, 1081 (1971)

[15] Peppard DF, Ferraro JR, J. Inorg. Nucl. Chem., 10, 275 (1959)