Method for removing cesium ions from water

Patent metadata

Field	Value
Publication number	US-9659678-B2
Application number	US-201214233885-A
Country	US
Kind code	B2
Filing date	Jul 20, 2012
Priority date	Jul 21, 2011
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention provides a method for efficiently separating cesium ions in a short time from an aqueous solution with the number of human working steps being reduced as much as possible and recovering the cesium ions, and an apparatus therefor.
Cesium ions in an aqueous solution are removed by preparing a cesium ion-containing magnetic particle in a cesium-containing aqueous solution and filtering or magnetically separating the magnetic particle.

First claim

The invention claimed is:

1. A method for removing cesium ions in an aqueous solution, comprising:
adding an aqueous solution of a substance having a cesium ion adsorption capacity to a cesium-containing aqueous solution, the aqueous solution of the substance having a cesium ion adsorption capacity comprising a dissolved water-soluble ferrocyanide, a dissolved water-soluble iron salt, and an alkali; while maintaining a temperature of 20 to 100° C.; whereby cesium ions are adsorbed by the substance to form a cesium ion-containing magnetic particle; and
(i) magnetically separating the magnetic particle from the aqueous solution; or
(ii) passing the aqueous solution through a filter to separate the magnetic particle from the aqueous solution.

2. The method for removing cesium ions according to claim 1 , wherein the water-soluble ferrocyanide is potassium ferrocyanide or sodium ferrocyanide and the water-soluble iron salt is iron chloride, iron sulfate or iron nitrate.

3. The method for removing cesium ions according to claim 1 , wherein the water-soluble iron salt is a mixture of ferrous chloride and ferric chloride.

4. The method for removing cesium ions according to claim 1 , further comprising:
adding a flocculant to the cesium-containing aqueous solution.

5. The method for removing cesium ions according to claim 1 , wherein the steps of adding the aqueous solution of the substance having a cesium ion adsorption capacity to the cesium-containing aqueous solution and separating the magnetic particle from the aqueous solution are performed within a total of 60 minutes.

Assignees

• Ohnishi Noriyuki
• Hata Hideyuki
• Xie Xiaomao
• Jnc Corp

Inventors

• Ohnishi Noriyuki
• Hata Hideyuki
• Xie Xiaomao

Classifications

• G21F9/06 Primary

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

• C02F1/5236

  using inorganic agents · CPC title

• C02F1/488

  for separation of magnetic materials, e.g. magnetic flocculation · CPC title

• C02F1/42

  by ion-exchange (ion-exchange in general B01J) · CPC title

• B03C1/01

  by addition of magnetic adjuvants · CPC title