Treatment method for solution containing metal ions using cation adsorbent

Patent metadata

Field	Value
Publication number	US-10081850-B2
Application number	US-201615177455-A
Country	US
Kind code	B2
Filing date	Jun 9, 2016
Priority date	Aug 23, 2011
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A cation adsorbent of an embodiment includes tungsten oxide particles having a BET specific surface area in a range of 0.82 m 2 /g or more and 820 m 2 /g or less. The cation adsorbent is added to a solution to be treated containing cations being recovery objects, and the cation adsorbent adsorbing the cations is precipitated. The generated precipitate is separated from the solution to recover the cations.

First claim

The invention claimed is:

1. A treatment method of a solution, comprising:
adding a cation adsorbent comprising tungsten oxide particles having a BET specific surface area in a range of 0.82 m 2 /g or more and 820 m 2 /g or less to a solution to be treated containing cations being recovery objects to let the cation adsorbent adsorb the cations;
precipitating the cation adsorbent adsorbing the cations to obtain precipitate; and
separating the precipitate from the solution to recover the cations,
wherein the cation is at least one ion selected from the group consisting of a cesium (Cs) ion, a strontium (Sr) ion, an iodine (I) ion, and a lithium (Li) ion.

2. The treatment method of the solution according to claim 1 , further comprising:
preparing a dispersion liquid by dispersing the cation adsorbent in an aqueous dispersion medium,
wherein the dispersion liquid containing the cation adsorbent is added to the solution.

3. The treatment method of the solution according to claim 1 ,
wherein the solution in which the cation adsorbent is added or the precipitate is treated by using an organic coagulant.

4. The treatment method of the solution according to claim 1 ,
wherein the solution contains a sodium (Na) ion together with the cation.

5. The treatment method of the solution according to claim 1 ,
wherein the solution contains at least one ion selected from the group consisting of a magnesium (Mg) ion, a calcium (Ca) ion, and a potassium (K) ion together with the cation.

6. The treatment method of the solution according to claim 1 ,
wherein the solution is seawater containing the cesium (Cs) ion, and an adsorption ration of the cesium (Cs) ion by the cation adsorbent is 90% or more.

Assignees

• Toshiba Kk
• Toshiba Materials Co Ltd

Inventors

• Sato Akira
• Fukushi Daisuke
• Kusaka Takao
• Nakano Kayo
• Inui Yukiko
• Sasaki Akito

Classifications

• C02F1/5272

  using specific organic precipitants · CPC title

• G21F9/12

  by absorption; by adsorption; by ion-exchange · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• B01J20/28059

  being less than 100 m2/g · CPC title

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title