Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Dissolution of synthetic U-DBP and corrosion of stainless steel by dissolution schemes

  • Guanghui Wang (College of Nuclear Science and Technology, Harbin Engineering University) ;
  • Yaorui Li (College of Nuclear Science and Technology, Harbin Engineering University) ;
  • Mingjian He (College of Nuclear Science and Technology, Harbin Engineering University) ;
  • Meng Zhang (College of Nuclear Science and Technology, Harbin Engineering University) ;
  • Yang Gao (College of Nuclear Science and Technology, Harbin Engineering University) ;
  • Hui He (College of Nuclear Science and Technology, Harbin Engineering University) ;
  • Caishan Jiao (College of Nuclear Science and Technology, Harbin Engineering University)
  • Received : 2022.10.25
  • Accepted : 2023.01.30
  • Published : 2023.05.25
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Abstract

In spent fuel reprocessing, UO2(DBP)2 (U-DBP) can be deposited in stainless steel equipment. U-DBP must be removed by dissolution and the process must not cause corrosion to stainless steel. This study was conducted to find the best scheme for dissolution. U-DBP was manufactured by the titrimetric sedimentation method. The effects of different factors on the dissolution of U-DBP were investigated. For example, solid-liquid ratio, hydrazine carbonate solutions with different mass components, mixed solutions containing different concentrations of H2O2, and different carbonates. The results indicated that U-DBP does not have a regular crystal morphology. With the increase of the solid-liquid ratio and the mass fraction of hydrazine carbonate, the concentration of U(VI) at the dissolution equilibrium increases gradually. The addition of H2O2 has a great promotion effect on the dissolution. However, when the concentration of H2O2 is greater than 0.5 M, the dissolution solution may have an erosive effect on the stainless steel. (NH4)2CO3 can increase the dissolution capacity of dissolved U-DBP, but it may also accelerate the corrosion of stainless steel.

Keywords

Acknowledgement

We acknowledge financial support from the National Natural Science Foundation of China (U1967219).

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