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A kind of adsorption method of radioactive iodine

A technology of radioactive iodine and adsorbent, applied in the direction of radioactive purification, separation methods, chemical instruments and methods, etc., can solve problems such as explosion and fire, and achieve the effect of maintaining fire resistance

Active Publication Date: 2021-02-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these solid sorbents for radioactive iodine treatment face fire and explosion hazards due to the presence of nitrogen oxides in the exhaust gas

Method used

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  • A kind of adsorption method of radioactive iodine
  • A kind of adsorption method of radioactive iodine
  • A kind of adsorption method of radioactive iodine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] H 3 BO 3 (4g) and C 3 N 6 h 6 (4 g) was added to 200 mL of distilled water. The mixture was stirred to 85 °C for complete dissolution and stirring was continued for 6 hours, then cooled to ambient temperature to produce a white precipitate. After filtration, the precipitate was washed with cold deionized water and dried overnight to obtain the precursor. Transfer the precursor to a corundum tube. Porous boron nitride was subsequently produced by a multi-step pyrolysis process: the precursor was preheated at 550 °C for 2 h, then heated at 2 °C min -1 The rate was slowly heated to 1100°C and kept for 2 hours, and finally calcined at 1200°C for 4 hours. All reactions were carried out under the protection of argon.

Embodiment 2

[0035] H 3 BO 3 (4g) and C 3 N 6 h 6 (4 g) was added to 200 mL of distilled water. The mixture was stirred to 85 °C for complete dissolution and stirring was continued for 6 hours, then cooled to ambient temperature to produce a white precipitate. After filtration, the precipitate was washed with cold deionized water and dried overnight to obtain the precursor. Transfer the precursor to a corundum tube. Porous boron nitride was subsequently produced by a multi-step pyrolysis process: the precursor was preheated at 550 °C for 2 h, then heated at 2 °C min -1 The rate was slowly heated to 1100°C and kept for 2 hours, and finally calcined at 1250°C for 4 hours. All reactions were carried out under the protection of argon.

Embodiment 3

[0037] H 3 BO 3 (4g) and C 3 N 6 h 6 (4 g) was added to 200 mL of distilled water. The mixture was stirred to 85 °C for complete dissolution and stirring was continued for 6 hours, then cooled to ambient temperature to produce a white precipitate. After filtration, the precipitate was washed with cold deionized water and dried overnight to obtain the precursor. Transfer the precursor to a corundum tube. Porous boron nitride was subsequently produced by a multi-step pyrolysis process: the precursor was preheated at 550 °C for 2 h, then heated at 2 °C min -1 The rate was slowly heated to 1100°C and kept for 2 hours, and finally calcined at 1300°C for 4 hours. All reactions were carried out under the protection of argon.

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Abstract

The invention relates to a radioactive iodine adsorption method, which adopts porous boron nitride material as an adsorbent to adsorb radioactive iodine, and maintains the I 2 Under the premise of high adsorption capacity, it can effectively maintain its refractory properties and acid resistance. The present invention first reports the use of porous boron nitride to capture radioactive iodine, and further studies its practicability and iodine removal performance. Through a series of tests such as flammability, acid leaching durability, etc., it is revealed that porous boron nitride has excellent thermal stability, acid resistance, oxidation resistance and hydrophobicity. And porous boron nitride has excellent flame retardancy, which is superior to the well-studied MOF and POP iodine removal materials. These advantages will greatly reduce the risk of fire and explosion in the exhaust stream and endow this material with great potential in practical radioactive waste reprocessing. Due to the porosity and Lewis acid-base interaction, porous boron nitride has a high level of adsorption of iodine vapor, and is a safe and effective radioactive iodine trap in practical applications.

Description

technical field [0001] The invention belongs to the technical field of nuclear waste treatment, and in particular relates to an adsorption method for radioactive iodine. Background technique [0002] Nuclear waste refers to radioactive materials that cannot be reused and are not allowed to be directly disposed of in the environment, including many kinds of substances. These substances not only vary greatly in activity and radiation half-life, but also vary greatly in form and chemical composition. Therefore, the disposal of nuclear waste is a major environmental problem, especially the proper disposal of radioactive iodine in the reprocessing of nuclear waste is recognized as a challenging subject. [0003] The discharge of iodine in nuclear waste will bring serious environmental pollution and have a huge impact on human metabolism. Therefore, the effective capture and storage of radioactive iodine is of great significance to human health and sustainable development. Curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01D53/02G21F9/02B01J20/30
CPCB01D53/02B01D2257/202B01J20/0248B01J20/0259G21F9/02
Inventor 逯乐慧艾可龙王娟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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