Solidifying method of hydroxides of radionuclides

Patent metadata

Field	Value
Publication number	US-11587693-B2
Application number	US-202016859465-A
Country	US
Kind code	B2
Filing date	Apr 27, 2020
Priority date	Oct 21, 2019
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

The present disclosure provides a solidifying method of a radionuclide. The solidifying method of the radionuclide includes operations of: providing a low melting point glass including Bi 2 O 3 , B 2 O 3 , ZnO and SiO 2 ; providing a glass mixture mixing a mixture to be treated containing a hydroxide of radionuclide and BaSO 4 and the low melting point glass; and heating the glass mixture.

First claim

What is claimed is:

1. A solidifying method of a radionuclide, comprising operations of:
providing a low melting point glass including Bi 2 O 3 , B 2 O 3 , ZnO and SiO 2 ;
providing a glass mixture by mixing a mixture to be treated containing a hydroxide of radionuclide and BaSO 4 , and the low melting point glass; and
heating the glass mixture.

2. The solidifying method of the radionuclide of claim 1 , wherein the radionuclide comprises at least one selected from a group consisting of radioisotopes of chromium, cobalt, iron and nickel metals.

3. The solidifying method of the radionuclide of claim 1 , wherein the low melting point glass has a melting point of 440 to 460° C.

4. The solidifying method of the radionuclide of claim 1 , wherein the mixture to be treated is a waste of HyBRID decontamination process.

5. The solidifying method of the radionuclide of claim 1 , wherein the mixture to be treated contains BaSO 4 in an amount of 90% to 97% by weight, based on a total weight of the mixture to be treated.

6. The solidifying method of the radionuclide of claim 1 , wherein the mixture to be treated is included in an amount of 15% to 20% by weight in the glass mixture, based on a total weight of the glass mixture.

7. The solidifying method of the radionuclide of claim 1 , wherein the mixture to be treated and the low melting point glass are provided as powders, respectively.

8. The solidifying method of the radionuclide of claim 7 , wherein the powder of the low melting point glass powder is a powder having a particle size of 0.8 to 1.2 times an average particle size of the powder of the mixture to be treated.

9. The solidifying method of the radionuclide of claim 1 , wherein the operation of heating the glass mixture is performed at 500 to 550° C.

10. The solidifying method of the radionuclide of claim 1 , wherein the low melting point glass is obtained by including operations of: mixing Bi 2 O 3 , B 2 O 3 , ZnO and SiO 2 powder particles; melting the mixed powder; cooling the molten material; and drying the cooled material.

11. The solidifying method of the radionuclide of claim 10 , wherein the operation of mixing Bi 2 O 3 , B 2 O 3 , ZnO and SiO 2 powder particles is performed by mixing 32 to 38 mol % of Bi 2 O 3 , 25 to 30 mol % of B 2 O 3 , 29 to 35 mol % of ZnO, and 5 to 7 mol % of SiO 2 , based on the total number of moles of the powder.

12. The solidifying method of the radionuclide of claim 10 , further comprising an operation of: pulverizing such that the average particle size of the low melting point glass powder is 180 to 220 mesh.

Assignees

• Korea Atomic Energy Res

Inventors

• Eun Hee Chul
• Chang Na On
• Kim Seon Byeong
• Choi Wang Kyu
• Park Sang Yoon
• Won Hui Jun
• Choi Man Soo
• Choi Byung Seon
• Moon Jei Kwon
• Jung Chong Hun
• Lee Song Bok
• Lee Sang Hun
• Seo Bum Kyoung

Classifications

• Y02P40/10

  Production of cement, e.g. improving or optimising the production methods; Cement grinding · CPC title

• C03C3/066 Primary

  containing zinc · CPC title

• G21F9/305 Primary

  Glass or glass like matrix (C03B5/005 takes precedence; compositional aspects C03C) · CPC title

• C03B5/005

  of glass-forming waste materials (disposal or transformation of solid waste in general B09B; treatment of radioactive waste G21F9/00) · CPC title

• C03C14/004

  the non-glass component being in the form of particles or flakes · CPC title