Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Oxalate Precipitation of Lanthanide and Actinide in a Simulated Radioactive Liquid Waste

모의 방사성용액에서 란탄족과 악티늄족원소의 옥살산침전

  • Chung, Dong-Yong (Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute) ;
  • Kim, Eung-Ho (Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute) ;
  • Lee, Eil-Hee (Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute) ;
  • Yoo, Jae-Hyung (Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute) ;
  • Park, Hyun-Soo (Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute)
  • 정동용 (한국원자력 연구소 핵화공연구팀) ;
  • 김응호 (한국원자력 연구소 핵화공연구팀) ;
  • 이일희 (한국원자력 연구소 핵화공연구팀) ;
  • 유재형 (한국원자력 연구소 핵화공연구팀) ;
  • 박현수 (한국원자력 연구소 핵화공연구팀)
  • Received : 1999.06.26
  • Accepted : 1999.10.05
  • Published : 1999.11.10
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Abstract

The oxalate precipitation of lanthanide and actinide by oxalic acid was investigated in the simulated radioactive liquid waste, which was composed of 17 elements of alkali, alkaline earth(Cs, Rb, Ba, Sr), transition metal(Zr, Fe, Mo, Ni, Pd, Rh), lanthanide(La, Y, Nd, Ce, Eu) and actinide(Np, Am) in nitric acid solution. The effect of concentrations of nitric acid and ascorbic acid on the precipitation yield of each element in the simulated solution was examined at 0.5 M oxalic acid concentration. The precipitation yields of the elements were usually decreased with nitric acid concentration, nevertheless, the precipitation yields of lanthanide and actinide were more than 99%. Palladium was precipitated due to the reduction of Pd(II) into Pd metal by the addition of ascorbic acid in the oxalate precipitation and then, the precipitation yields of Mo, Fe, Ni, Ba decreased by 10~20% with concentration of ascorbic acid. The reductive precipitation of Pd(II) into Pd metal by the addition of ascorbic acid into the simulated radwaste occurred at below 1 M nitric acid concentration and its yield showed maximum at the ascorbic acid concentration of 0.01~0.02 M. The hydrazine suppressed the reductive precipitation of Pd by the ascorbic acid.

알칼리 및 알칼리토금속(Cs, Rb, Ba, Sr), 전이금속(Zr, Fe, Mo, Ni, Pd, Rh), 란탄족(La, Y, Nd, Ce, Eu) 및 악티늄족(Np, Am) 등 17개 원소로 구성된 질산매질의 모의 방사성용액에서 옥살산에 의한 란탄족과 악티늄족 원소의 공침전 연구를 수행하였다. 옥살산 농도 0.5 M에서 질산농도의 영향과 아스코빅산 첨가에 따른 원소들의 침전율이 조사되었다. 각 원소들의 침전율은 질산농도에 따라 약간 감소하였으나 란탄족과 악티늄족은 99% 이상 침전되었다. 옥살산 침전시 아스코빅산이 첨가되는 경우 Pd이 금속으로 환원 침전되었고, 이때 Mo, Fe, Ni, Ba의 경우는 침전율이 약 10~20% 감소하는 것으로 나타났으나, 기타 원소들에 대해서는 영향이 나타나지 않았다. Pd(II) 이온은 질산농도 1.0 M 미만의 모의용액에서 아스코빅산 첨가시 Pd 금속으로의 환원침전이 일어났으며, 아스코빅산 농도가 0.01~0.02 M 부근에서 가장 크게 나타났다. 하이드라진이 아스코빅산과 같이 첨가될 때 Pd의 환원침전을 억제하는 것으로 나타났다.

Keywords

Acknowledgement

Supported by : 과학기술부

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