# US 11,309,098 B2 · Mineralogical method and apparatus for removal of aqueous cesium ion

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,309,098 B2
- Document ID: US11309098B2
- Status: Granted
- Kind: B2
- Application number: 16/789,623
- Filed: 2020-02-13
- Published: 2020-08-13
- Granted: 2022-04-19
- Earliest claimed: 2019-02-13
- Assignees: Korea Atomic Energy Research Institute
- Applicants: Korea Atomic Energy Research Institute
- Inventors: Seung Yeop Lee; Hyo Jin Seo; Jae Kwang Lee; Min Hoon Baik
- Web page: https://patentgrep.com/patent/US11309098B2

## CPC

- G21F 9/06: Processing (separating different isotopes of the same chemical element B01D59/00)
- G21F 9/16: by fixation in stable solid media {(G21F9/305 takes precedence)}
- G21F 9/12: by absorption; by adsorption; by ion-exchange
- 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

Mineralogical method and apparatus for removal of cesium ion in aqueous solution are provided. In particular, a mineralogical method for removal of cesium ion in aqueous solution including controlling a temperature of radioactive wastewater containing cesium from 25 to 45° C., controlling an initial pH of the radioactive wastewater from 6.0 to 8.5, and adding iron(II) and sulfide(−II) containing sulfur in the −2 oxidation state to the radioactive wastewater, to convert the cesium ion in aqueous solution into a cesium mineral, and a mineralogical apparatus for removal of cesium ion in aqueous solution, capable of being applied to such a method, are provided.

## Claims

### Claim 1

A mineralogical method for removal of cesium ion, comprising adding iron(II) and sulfide(−II) containing sulfur in the −2 oxidation state to radioactive wastewater containing cesium, to convert the cesium ion into a cesium mineral,
wherein the iron(II) and the sulfide(−II) in the adding of the iron(II) and the sulfide(−II) are added in a molar ratio of 1:1 to 1:2 based on 1 mol of the iron(II).

### Claim 2 (depends on 1)

The mineralogical method according to claim 1, wherein the cesium mineral is pautovite (CsFe2S3).

### Claim 3 (depends on 1)

The mineralogical method according to claim 1, further comprising controlling a temperature of the radioactive wastewater from 25 to 45° C., before the adding of the iron(II) and the sulfide(−II).

### Claim 4 (depends on 1)

The mineralogical method according to claim 1, further comprising controlling an initial pH of the radioactive wastewater from 6.0 to 8.5, before the adding of the iron(II) and the sulfide(−II).

### Claim 5 (depends on 1)

The mineralogical method according to claim 1, wherein the iron(II) in the adding of the iron(II) and the sulfide(−II) is added at a concentration of 1 to 2 mM.

### Claim 6 (depends on 1)

The mineralogical method according to claim 1, wherein an amount of the sulfide(−II) introduced in the adding of the iron(II) and the sulfide(−II) is controlled to increase pH of the radioactive wastewater to 10.

### Claim 7 (depends on 1)

The mineralogical method according to claim 1, wherein the iron(II) is at least one selected from the iron(II) reagent group consisting of iron chloride, iron sulfate, iron nitrate, iron carbonate, iron hydroxide, and iron formate.

### Claim 8 (depends on 1)

The mineralogical method according to claim 1, wherein the sulfide(−II) is at least one selected from the sulfide (−II) reagent group consisting of potassium sulfide, sodium sulfide, hydrogen sulfide, magnesium sulfide, and calcium sulfide.

### Claim 9 (depends on 1)

The mineralogical method according to claim 1, further comprising adding a reducing agent to the radioactive wastewater in the adding of the iron(II) and the sulfide(−II).

### Claim 10 (depends on 9)

The mineralogical method according to claim 9, wherein the reducing agent is added in an amount of 50 to 500 g per 1 ton of the radioactive wastewater.

### Claim 11 (depends on 1)

The mineralogical method according to claim 1, further comprising adding carbonate to the radioactive wastewater.

### Claim 12 (depends on 11)

The mineralogical method according to claim 11, wherein the adding of the carbonate is carried out at a pH of 10 or less.

### Claim 13 (depends on 11)

The mineralogical method according to claim 11, wherein the adding of the carbonate is carried out simultaneously with or separately from the adding of the iron(II) and the sulfide(−II).