Caesium selective absorbent and preparation method thereof

A selective, adsorbent technology, used in chemical instruments and methods, radioactive purification, other chemical processes, etc., can solve problems such as being unsuitable for fixed-bed operation, and achieve the effects of easy operation, simple equipment, and mild synthesis conditions.

Active Publication Date: 2014-06-04
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings that some cesium selective inorganic ion exchangers are not suitable for fixed bed operation, and provide a cesium i

Method used

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  • Caesium selective absorbent and preparation method thereof
  • Caesium selective absorbent and preparation method thereof
  • Caesium selective absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Polyacrylonitrile is dissolved in dimethyl sulfoxide to prepare a 4% polyacrylonitrile solution;

[0032] (2) Add potassium nickel ferrocyanide powder whose mass is 4 times the dry weight of polyacrylonitrile, with a particle size of less than 160 mesh, to the above polyacrylonitrile solution, and then fully stir at 50°C for 2 hours to mix the slurry Uniform;

[0033] (3) Put the slurry obtained in step (2) into the granulation device, after spraying through the spray hole, enter the coagulation bath to solidify and form, and make spherical particles of polyacrylonitrile / potassium ferrocyanide after cleaning, drying and other conventional procedures NiCesium selective adsorbent. The air inlet device in the granulation device used is an air compressor, the liquid inlet device is a liquid inlet tank with a capacity of 10mL, the drying device is filled with concentrated sulfuric acid, the gas flow rate is 380L / h, the coagulation bath is deionized water, and the coagul...

Embodiment 2

[0036] (1) Polyacrylonitrile is dissolved in dimethyl sulfoxide to prepare a 2% polyacrylonitrile solution;

[0037] (2) Add potassium ferrocyanide cobalt powder, whose mass is 9 times the dry weight of polyacrylonitrile, with a particle size of less than 160 mesh, to the above polyacrylonitrile solution, and then fully stir at 40°C for 2 hours to mix the slurry Uniform;

[0038] (3) Put the slurry obtained in step (2) into the granulation device, after spraying through the spray hole, enter the coagulation bath to solidify and form, and make spherical particles of polyacrylonitrile / potassium ferrocyanide after cleaning, drying and other conventional procedures Cobalt and cesium selective adsorbent. The air inlet device in the granulation device used is an air compressor, the liquid inlet device is a liquid inlet tank with a capacity of 10mL, the drying device is filled with concentrated sulfuric acid, the gas flow rate is 380L / h, the coagulation bath is deionized water, and ...

Embodiment 3

[0040] (1) Polyacrylonitrile is dissolved in dimethyl sulfoxide to prepare a 20% polyacrylonitrile solution;

[0041] (2) Add potassium ferrocyanide cobalt powder whose mass is 1 times the dry weight of polyacrylonitrile, particle size less than 160 mesh, to the above polyacrylonitrile solution, and then fully stir at 60°C for 2 hours to mix the slurry Uniform;

[0042](3) Put the slurry obtained in step (2) into the granulation device, after spraying through the spray hole, enter the coagulation bath to solidify and form, and make spherical particles of polyacrylonitrile / potassium ferrocyanide after cleaning, drying and other conventional procedures Cobalt and cesium selective adsorbent. The air inlet device in the granulation device used is an air compressor, the liquid inlet device is a liquid inlet tank with a capacity of 10mL, the drying device is filled with concentrated sulfuric acid, the gas flow rate is 380L / h, the coagulation bath is deionized water, and the coagula...

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Abstract

The invention provides a caesium selective absorbent and a preparation method of the caesium selective absorbent and belongs to the fields of material preparation and radioactive liquid waste disposal. The caesium selective absorbent is in a sphere-similar particle shape and comprises the following components in parts by weight: 50-90 parts of an inorganic ion exchanging agent and 10-50 parts of polyacrylonitrile, wherein the inorganic ion exchanging agent has high selectivity to caesium. According to the sphere-similar caesium selective absorbent, the high selectivity of the inorganic ion exchanging agent to the caesium is remained, and the caesium selective absorbent is regular in shape and can be uniformly filled in a fixed bed due to the sphere-similar shape, so that the problem that a primary inorganic ion exchanging agent is not suitable for the operation of the fixed bed is solved, and the prepared absorbent can be used for processing radioactive liquid waste generated by nuclear industries and nuclear power stations through the fixed bed. The preparation method is unique and has the advantages of simplicity in operation, mild synthesis condition and the like; a granulating device utilized in the preparation method is simple, is easy to operate and is good in repeatability.

Description

technical field [0001] The invention belongs to the field of material preparation and radioactive waste liquid treatment, and in particular relates to a cesium selective adsorbent and a preparation method thereof. 137 Cs. Background technique [0002] Nuclear power plants and some other nuclear facilities will produce a large amount of radioactive waste during operation, maintenance, decommissioning and accidents. 137 Cs is one of the main radionuclides in this kind of waste liquid, it is a long-lived (t 1 / 2 =30.17a) high heat release fission product, its radioactivity will bring long-term impact on human living environment. Before the further treatment of radioactive wastewater, if the radioactive 137 Removal of Cs can not only reduce the storage period of wastewater and the quality requirements for storage materials, but also save storage costs. [0003] Currently, including 137 The treatment methods of Cs waste liquid mainly include evaporation, precipitation, ion e...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30B01J20/28G21F9/12
Inventor 贾铭椿杜志辉门金凤王晓伟
Owner NAVAL UNIV OF ENG PLA
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