Method and composition for removing radioactive cesium

Patent metadata

Field	Value
Publication number	US-9412479-B2
Application number	US-201514795986-A
Country	US
Kind code	B2
Filing date	Jul 10, 2015
Priority date	Feb 19, 2013
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The present invention intends to provide a method for removing radioactive cesium, or radioactive iodine and radioactive cesium that is simple and low-cost, further does not require an energy source such as electricity, moreover can take in and stably immobilize the removed radioactive substances within a solid, and can reduce the volume of radioactive waste as necessary, and to provide a hydrophilic resin composition using for the method for removing radioactive cesium, or radioactive iodine and radioactive cesium, and the object of the present invention is achieved by using a hydrophilic resin composition containing: at least one hydrophilic resin selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having at least a hydrophilic segment; and a clay mineral dispersed therein in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

First claim

The invention claimed is:

1. A method for removing radioactive cesium applying removal processing to radioactive cesium in a radioactive waste liquid and/or a radioactive solid matter using a hydrophilic resin composition comprising a hydrophilic resin and a clay mineral,
wherein the hydrophilic resin composition comprises at least one hydrophilic resin selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having a hydrophilic segment; and
the hydrophilic resin composition comprises the clay mineral dispersed therein in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

2. A method for removing radioactive cesium applying removal processing to radioactive cesium present in a radioactive waste liquid and/or a radioactive solid matter using a hydrophilic resin composition comprising a hydrophilic resin and a clay mineral,
wherein the hydrophilic resin composition comprises at least one hydrophilic resin selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having a hydrophilic segment and further each having, in the main chain and/or a side chain in the structure thereof, a polysiloxane segment; and
the hydrophilic resin composition comprises the clay mineral dispersed therein in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

3. The method for removing radioactive cesium according to claim 2 , wherein the hydrophilic resin is a resin formed from, as a part of a raw material, a compound having at least one active hydrogen-containing group and a polysiloxane segment in the same molecule.

4. The method for removing radioactive cesium according to claim 1 , wherein the hydrophilic segment is a polyethylene oxide segment.

5. The method for removing radioactive cesium according to claim 1 , wherein the clay mineral is at least one selected from the group consisting of pyrophylite, Kaolinite, mica, smectite (montmorillonite), and vermiculite each having a layered structure.

6. A hydrophilic resin composition for removing radioactive cesium having a function capable of immobilizing radioactive cesium in liquid and/or a solid matter,
wherein the hydrophilic resin composition comprises a hydrophilic resin and a clay mineral;
the hydrophilic resin is a hydrophilic resin having a hydrophilic segment, the resin being insoluble to water and hot water; and
the clay mineral is dispersed in the hydrophilic resin composition in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

7. A hydrophilic resin composition for removing radioactive cesium having a function of removing radioactive cesium in liquid and/or a solid matter,
wherein the hydrophilic resin composition comprises a hydrophilic resin and a clay mineral;
the hydrophilic resin is at least one selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having a hydrophilic segment and each obtained by reacting an organic polyisocyanate with a high molecular weight hydrophilic polyol and/or polyamine being a hydrophilic component; and
the clay mineral is dispersed in the hydrophilic resin composition in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

8. A hydrophilic resin composition for removing radioactive cesium exhibiting a function capable of immobilizing radioactive cesium in liquid and/or a solid matter,
wherein the hydrophilic resin composition comprises a hydrophilic resin and a clay mineral;
the hydrophilic resin is a resin having a hydrophilic segment and a polysiloxane segment and obtained by reacting, as a part of a raw material, a compound having at least one active hydrogen-containing group and a polysiloxane segment in the same molecule, the resin being insoluble to water and hot water; and
the clay mineral is dispersed in the hydrophilic resin composition in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

9. A hydrophilic resin composition for removing radioactive cesium exhibiting a function capable of immobilizing radioactive cesium in liquid and/or a solid matter,
wherein the hydrophilic resin composition comprises a hydrophilic resin and a clay mineral;
the hydrophilic resin is at least one selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having a hydrophilic segment, further each having, in the main chain and/or a side chain in the structure thereof, a polysiloxane segment, and each obtained by reacting an organic polyisocyanate, a high molecular weight hydrophilic polyol and/or polyamine being a hydrophilic component, and a compound having at least one active hydrogen-containing group and a polysiloxane segment in the same molecule; and
the clay mineral is dispersed in the hydrophilic resin composition in a ratio of at least 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

10. The hydrophilic resin composition for removing radioactive cesium according to claim 6 , wherein the hydrophilic segment is a polyethylene oxide segment.

11. The hydrophilic resin composition for removing radioactive cesium according to claim 6 , wherein the clay mineral is at least one selected from the group consisting of pyrophylite, Kaolinite, mica, smectite (montmorillonite), and vermiculite each having a layered structure.

12. A method for removing radioactive iodine and radioactive cesium applying removal processing to both of radioactive iodine and radioactive cesium in a radioactive waste liquid and/or a radioactive solid matter using a hydrophilic resin composition comprising a hydrophilic resin and a clay mineral,
wherein the hydrophilic resin composition comprises at least one hydrophilic resin selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having a hydrophilic segment and further each having, in the main chain and/or a side chain in the structure thereof, a tertiary amino group; and
the hydrophilic resin composition comprises the clay mineral dispersed therein in a ratio of 1 to 180 mass parts relative to 100 mass parts of the hydrophilic resin.

13. The method for removing radioactive iodine and radioactive cesium according to claim 12 , wherein the hydrophilic resin is a resin formed from, as a part of a raw material, a polyol having at least one tertiary amino group or a polyamine having at least one tertiary amino group.

14. A method for removing radioactive iodine and radioactive cesium capable of applying removal processing to both of radioactive iodine and radioactive cesium present in a radioactive waste liquid and/or a radioactive solid matter using a hydrophilic resin composition comprising a hydrophilic resin and a clay mineral,
wherein the hydrophilic resin composition comprises at least one hydrophilic resin selected from the group consisting of a hydrophilic polyurethane resin, a hydrophilic polyurea resin, and a hydrophilic polyurethane-polyurea resin each having a hydrophilic segment and further each having, in the main chain and/or a side chain in the structure thereof, a tertiary amino group and a polysiloxane segment; and
the hydrophilic resin composition comprises the clay mineral dispersed therein in a ratio of 1 to 180 mass parts r

Assignees

• Dainichiseika Color Chem
• Ukima Colour & Chem Mfg

Inventors

• Hanada Kazuyuki
• Kimura Kazuya
• Muto Kazuaki
• Takahashi Kenichi
• Uruno Manabu

Classifications

• C08G18/5024

  containing primary and/or secondary amino groups · CPC title

• C08G18/3275

  containing two hydroxy groups · CPC title

• G21F9/162 Primary

  in an inorganic matrix, e.g. clays, zeolites · CPC title

• G21F9/30

  Processing (separating different isotopes of the same chemical element B01D59/00) · CPC title

• C08L75/04

  Polyurethanes · CPC title