Treatment method of radioactive iodine-containing fluid

Patent metadata

Field	Value
Publication number	US-11110430-B2
Application number	US-201716079177-A
Country	US
Kind code	B2
Filing date	Feb 23, 2017
Priority date	Feb 26, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

The present invention provides a treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine.

First claim

What is claimed is:

1. A treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine, wherein the binderless zeolite molded body constituting the adsorbent for iodine is either a binderless A-type zeolite molded body alone or a binderless X-type zeolite molded body alone, and wherein the binderless zeolite molded body includes a zeolite powder and zeolite fine particles wherein the zeolite powder has on a surface thereof the zeolite fine particles, and an average particle size of the zeolite powder is 2 μm or more and 8 μm or less wherein the average particle size of the zeolite powder is determined by measuring the size of randomly extracting 30 or more of independent smallest unit of particles having a particle size of 1.5 μm or less identifiable in a scanning electron microscope image at a measurement magnification of 10,000 to 15,000, and an average particle of the zeolite fine particles is 0.2 μm or more and 1.5 μm or less wherein the average particle size of the zeolite fine particles is determined by measuring the size of randomly extracting 30 or more of independent particles identifiable in a scanning electron microscope image at a measurement magnification of 1,500 to 3,000.

2. The treatment method of a radioactive iodine-containing fluid according to claim 1 , wherein the adsorbent for iodine is consisting of a silver-containing binderless zeolite molded body containing 5 mass % or more of silver ions.

3. The treatment method of a radioactive iodine-containing fluid according to claim 1 , wherein the radioactive iodine-containing fluid is a liquid, and the silver-containing binderless zeolite molded body is in a particle form having a particle size falling within a range from 30 μm to 1500 μm.

4. The treatment method of a radioactive iodine-containing fluid according to claim 2 , wherein the radioactive iodine-containing fluid is a liquid, and the silver-containing binderless zeolite molded body is in a particle form having a particle size falling within a range from 30 μm to 1500 μm.

Assignees

• Ebara Corp
• Tosoh Corp

Inventors

• Sakuma Takashi
• Komatsu Makoto
• Izumi Takeshi
• Tokunaga Keisuke
• Hirano Shigeru

Classifications

• C01B39/18

  from a reaction mixture containing at least one aluminium silicate or aluminosilicate of a clay type, e.g. kaolin or metakaolin or its exotherm modification or allophane {(C01B39/145 takes precedence)} · CPC title

• B01J20/28

  characterised by their form or physical properties · CPC title

• B01J20/3007

  Moulding, shaping or extruding · CPC title

• B01J20/28016

  Particle form · CPC title

• B01D53/04

  with stationary adsorbents {(B01D53/025 takes precedence)} · CPC title