Method for removing radiocesium 137 with titanium potassium ferrocyanide spherical particles

A technology using titanium potassium ferrocyanide and ferrous iron, applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., to achieve the effects of difficult analysis, mild experimental conditions, and large adsorption capacity

Inactive Publication Date: 2012-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Research progress on the removal of cesium from high-level acidic waste liquid by inorganic ion exchange [J], Radiation Protection Communication, 2000, 20(6): 8-13), but this kind of adsorbent is only suitable for highly acidic waste liquid with radioactive elements Experiments have been carried out, and whether it can be applied to radioactive element wastewater with complex components remains to be verified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Spherical particles of titanium potassium ferrocyanide with a particle size of 1.0 mm were selected, and their saturated adsorption capacity for cesium was determined by static cesium saturation adsorption experiments to be 0.9 mmolCs / g dry composite particles; the radioactive dose in 20 ml was 2500 Bq / Add 50 mg of spherical particles of potassium ferrocyanide potassium ferrocyanide with a particle size of 1.0 mm to the seawater containing cesium 137 in ml; put the seawater sample containing cesium 137 into a constant temperature oscillator, and set the temperature of the constant temperature oscillator to 25 ℃, the rotation speed was 200 rpm, and the constant temperature oscillator was turned on; after 8 hours, the content of residual cesium was analyzed with a liquid scintillation analyzer, and the result was that the removal rate of radioactive cesium was 99%.

Embodiment 2

[0020] Spherical particles of potassium ferrocyanide potassium ferrocyanide with a particle size of 0.6 mm were selected, and their saturated adsorption capacity for cesium was determined to be 1.2 mmolCs / g dry composite particles by static cesium saturation adsorption experiments; the radioactive dose in 20 ml was 75000 Bq / Add 50 mg of spherical particles of potassium ferrocyanide potassium ferrocyanide with a particle size of 0.6 mm to the seawater containing cesium 137 in ml; put the seawater sample containing cesium 137 into a constant temperature oscillator, and set the temperature of the constant temperature oscillator to 25 ℃, the rotation speed was 150 rpm, and the constant temperature oscillator was turned on; after 8 hours, the content of residual cesium was analyzed with a liquid scintillation analyzer, and the result was that the removal rate of radioactive cesium was 99%.

Embodiment 3

[0022] Spherical particles of potassium ferrocyanide potassium ferrocyanide with a particle size of 0.4 mm were selected, and their saturated adsorption capacity for cesium was determined to be 1.3 mmolCs / g dry composite particles by static cesium saturation adsorption experiments; the radioactive dose in 20 ml was 15000 Bq / Add 50 mg of spherical potassium ferrocyanide particles with a particle size of 0.4 mm to seawater containing cesium 137 in ml; put the seawater sample containing cesium 137 into a constant temperature oscillator, and set the temperature of the constant temperature oscillator to 20 ℃, the rotation speed was 100 rpm, and the constant temperature oscillator was turned on; after 8 hours, the content of residual cesium was analyzed with a liquid scintillation analyzer, and the result was that the removal rate of radioactive cesium was 97%.

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Abstract

The invention belongs to the technical field of radioelement treatment methods, and particularly relates to a method for removing radiocesium 137 with titanium potassium ferrocyanide spherical particles, which comprises the following steps: adding titanium potassium ferrocyanide spherical particles into a sea water sample containing cesium 137, putting the sea water sample containing cesium 137 in a constant temperature oscillator, and waiting for some time to remove the radiocesium 137. The titanium potassium ferrocyanide spherical particles have high adsorption capacity for cesium, and can not be easily decomposed, and the adsorptive particles can be easily recycled; the particles which adsorb cesium can be converted into oxides to facilitate temporary storage; and the experimental conditions are mild. The saturation adsorption capacity for cesium of the titanium potassium ferrocyanide spherical particles is 0.9-1.3 mmol Cs / g dry composite particles, and the adsorption capacity for radiocesium in the sea water sample containing cesium 137 (the total cesium content is 5-10 times of radiocesium), of which the radiation dose is 2500-75000 Bq / ml, is up to 97% after 8 hours.

Description

technical field [0001] The invention belongs to the technical field of radioactive element processing methods, and in particular relates to a method for removing radioactive cesium 137 by using titanium potassium ferrocyanide spherical particles. Background technique [0002] With the development of nuclear power industry, radioactive waste liquid is more and more harmful to the environment. Many radionuclides will migrate to aquatic organisms and various crops in water and soil, thus causing great harm to human survival. Therefore, The safe disposal of radioactive element waste liquid is very important. Cesium (Cs) is a highly pyrogenic fission product with a long half-life. Its removal and recovery research has always been valued by countries all over the world, especially the Fukushima incident in Japan in 2011, which has aroused people's heightened awareness of the safe disposal of radioactive waste liquid. focus on. [0003] The treatment of cesium is mainly the ion e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/28B01J20/04
Inventor 文明芬王建晨冯孝贵陈靖
Owner TSINGHUA UNIV
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