Leaching resistance of simulated radioactive graphite waste forms prepared by SHS

Si Jin Su, Yi Ding, Yan Hong Zhao, Tao Duan, Fa Cheng Yi, Xi Rui Lu, Yan Lin Wu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In order to study the SHS immobilization effect of the radioactive graphite, the exothermic reaction (3C + 4Al + 3TiO2 = 2Al2O3 + 3TiC + Q), in which Sr2+ was used to simulate 90SrO, and Nd3+, Ce4+ were used to simulate An3+, An4+, respectively, was introduced in the air and N2 atmosphere by SHS equipment self-designed. The addition amount of simulated radionuclide was SrO 1%~8 %, Nd2O3 1%, CeO2 1%~3% in the air and SrO 1%~8 %, Nd2O3 1%, CeO2 1%~2% in N2 atmosphere, respectively. The leaching experiments of waste forms prepared were conducted in synthetic sea water at 40°C and 70°C. X-ray diffractometer (XRD) and inductively coupled plasma source mass spectrometer were used to test and analyze the phase composition and leaching data of these samples. The anti-leaching properties were studied on the basis of a detailed research on the phase changes of waste forms within solid solution. The results indicated that leaching concentration of Sr2+, Nd3+, Ce4+ in waste forms prepared in both air and N2 atmosphere increased gradually with extending immersion time, and it was higher at 70°C than 40°C. The leaching concentration of simulated nuclides was higher in waste forms prepared in N2 atmosphere than in the air.

Original languageEnglish
Pages (from-to)10-17
Number of pages8
JournalWuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology
Volume36
Issue number6
DOIs
Publication statusPublished - 2014 Jun
Externally publishedYes

Keywords

  • Chemical stability
  • Preparation
  • Radioactive graphite
  • SHS
  • Waste forms

ASJC Scopus subject areas

  • Engineering(all)

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