# US 9,437,338 B2 · Solidification method of radioactive waste

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- Number: US 9,437,338 B2
- Document ID: US9437338B2
- Status: Granted
- Kind: B2
- Application number: 14/323,670
- Filed: 2014-07-03
- Published: 2015-01-08
- Granted: 2016-09-06
- Earliest claimed: 2013-07-05
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Akio Sayano; Shohei Kawano; Yoshiyuki Kawaharada; Masamichi Obata; Hirotada Hayashi; Yusuke Nohara
- Web page: https://patentgrep.com/patent/US9437338B2

## CPC

- G21F 9/302: {in an inorganic matrix}
- G21F 9/12: by absorption; by adsorption; by ion-exchange
- G21F 9/125: {by solvent extraction}
- G21F 9/16: by fixation in stable solid media {(G21F9/305 takes precedence)}
- G21F 9/162: {in an inorganic matrix, e.g. clays, zeolites}
- G21F: PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR (radiation protection by pharmaceutical means A61K8/00, A61Q17/04; in cosmonautic vehicles B64G1/54; combined with a reactor G21C11/00; combined with X-ray tubes H01J35/16; combined with X-ray apparatus H05G1/02)

## Abstract

A solidification method of radioactive waste is provided, including kneading a binder and an inorganic adsorbent to obtain a kneaded object, the in organic adsorbent included radionuclides; extruding the kneaded object to obtain an extruded material object; cutting the extruded material object to obtain at least one extruded material block; and firing the at least one extruded material block to solidify the at least one extruded material block.

## Claims

### Claim 1

A solidification method of radioactive waste, comprising:
preparing an inorganic adsorbent absorbed with a radionuclide;
kneading a binder and the inorganic adsorbent absorbed with the radionuclide to obtain a kneaded object;
extruding the kneaded object to obtain an extruded material object;
cutting the extruded material object to obtain at least one extruded material block; and
firing the at least one extruded material block to solidify the at least one extruded material block.

### Claim 2 (depends on 1)

The solidification method of radioactive waste according to claim 1, wherein the binder contains clayey mineral.

### Claim 3 (depends on 2)

The solidification method of radioactive waste according to claim 2, wherein the clayey mineral is composed primarily of bentonite or kaolin.

### Claim 4 (depends on 1)

The solidification method of radioactive waste according to claim 1, wherein the binder is added to the inorganic adsorbent in an amount of 4%˜60% of the inorganic adsorbent.

### Claim 5 (depends on 1)

The solidification method of radioactive waste according to claim 1, wherein the inorganic adsorbent includes chabazite or crystalline silico titanate.

### Claim 6 (depends on 1)

The solidification method of radioactive waste according to claim 1, wherein the at least one extruded material block is fired during the firing at temperature set in a range of 700-900 degrees Celsius in an ambient atmosphere.