Journal of Radioanalytical and Nuclear Chemistry

, Volume 204, Issue 2, pp 265–274

Formation of palladium precipitate by hydrazine in a simulated high level liquid waste

Authors

  • Dong-Yong Chung
    • Korea Atomic Energy Research Institute
  • Eung-Ho Kim
    • Korea Atomic Energy Research Institute
  • Young-Joon Shin
    • Korea Atomic Energy Research Institute
  • Jae-Hyung Yoo
    • Korea Atomic Energy Research Institute
  • Jong-Duk Kim
    • Department of Chemical EngineeringKorea Advanced Institute of Science and Technology
Article

DOI: 10.1007/BF02060315

Cite this article as:
Chung, D., Kim, E., Shin, Y. et al. Journal of Radioanalytical and Nuclear Chemistry, Articles (1996) 204: 265. doi:10.1007/BF02060315

Abstract

The formation of precipitates by hydrazine was experimentally examined in the simulated high level liquid waste (HLLW), which was composed of 9 elements (Nd, Fe, Ni, Mo, Zr, Pd, Ru, Cs, Sr). Palladium was precipitated over 90% above 0.05M of hydrazine concentration and at 2M HNO3, while all of the other elements were hardly precipitated. The elements of Pd and Zr were precipitated 93% and 70% in the simulated solution in which the concentrations of Zr and Mo were decreased from 0.069M to 3.45·10−3M and 6.9·10−3M, respectively, and the acid concentration was decreased to about 0.5M after denitration. In a Pd solution of 0.5M and 2M HNO3, the precipitation yield of Pd increased with hydrazine concentration and reached over 98% at 0.1M. The precipitation yield of Pd at 0.5M HNO3 was higher than at 2M HNO3. The Pd precipitate, formed by adding hydrazine to an acidified solution, was an amorphous compound consisting of Pd, hydrazine, nitrate and hydrate.

Copyright information

© Akadémiai Kiadó 1996