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Method for removing radioactive iodine from gas cooled reactor

A technology of radioactive iodine and gas-cooled reactors, applied in the direction of radioactive purification, separation methods, chemical instruments and methods, etc., can solve the problems of low temperature of adsorbents and unsuitability for high-temperature gas-cooled reactors, and achieve stable performance and decontamination Good effect, good pressure stability effect

Inactive Publication Date: 2015-02-11
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the existing technology can eliminate radioactive elemental iodine or iodine-containing compounds to a certain extent, the use temperature of the adsorbent used is relatively low, which is not suitable for use in high-temperature gas-cooled reactors

Method used

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  • Method for removing radioactive iodine from gas cooled reactor
  • Method for removing radioactive iodine from gas cooled reactor
  • Method for removing radioactive iodine from gas cooled reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of 15%Ag / 13X adsorbent

[0037] Weigh 9.45g AgNO 3 , dissolved in 200mL deionized water, and stirred evenly. Weigh 40g of 13X molecular sieve (20 / 60 mesh powder particles), drop into the above AgNO 3 In the solution, stirred and impregnated at room temperature for 12 hours, then evaporated to remove water, and dried at 110°C for 12 hours. The dried sample was placed in a muffle furnace, raised from room temperature to 450 °C at a rate of 2 °C / min, and then naturally cooled at 450 °C for 2 hours to obtain a 15% Ag / 13X adsorbent (15% Ag / 13X mass percentage), marked as 15%Ag / 13X (450C / 2h).

[0038] The crystal phase structure of the carrier 13X molecular sieve and the adsorbent 15%Ag / 13X (450C / 2h) is analyzed by XRD (X-ray diffraction), and the spectrogram is as follows figure 1 As shown, the results show that the sample 15%Ag / 13X (450C / 2h) maintains the crystal phase structure of 13X molecular sieve.

[0039] (2) Test of 15%Ag / 13X adsorption performanc...

Embodiment 2

[0042] Except that the bed temperature of the adsorption column is 550° C., the others are the same as in Example 1. The measured and calculated decontamination coefficient DF is shown in Table 1.

Embodiment 3

[0044] Except that the bed temperature of the adsorption column is 650° C., the others are the same as in Example 1. The measured and calculated decontamination coefficient DF is shown in Table 1.

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PUM

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Abstract

The invention relates to a method for removing radioactive iodine from a gas at a high temperature, and belongs to the technical fields of environmental protection and the nuclear industry. The method is characterized in that a silver loaded adsorbent is adopted to remove radioactive iodine from a gas cooled reactor primary circuit at a high temperature of 350-650DEG C; the silver loaded adsorbent is prepared through dipping and high-temperature thermal treatment with silver as an adsorption component and a molecular sieve as a carrier; and the silver loaded adsorbent has high thermal stability and strong decontamination ability.

Description

technical field [0001] The invention relates to an Ag adsorbent for adsorbing radioactive iodine and a preparation method thereof, which belongs to the field of environmental protection, and also belongs to the technical fields of nuclear industry technology and adsorbent manufacturing engineering. Background technique [0002] With the development of the nuclear industry, the purification of radioactive substances in reactor exhaust has become a very important and prominent issue. Among them, the purification of radioactive iodine has received widespread attention in various countries. Radioactive iodine is a volatile, pro-thyroid and highly toxic nuclide; the direct leakage of radioactive iodine into the atmosphere will pollute the surrounding environment. In order to ensure environmental safety, effective purification measures must be taken. The purification of iodine or iodide usually adopts adsorption removal or absorption capture technology. Activated carbon or macr...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30B01D53/02
CPCG21F9/02B01D53/02B01D2253/10B01D2253/108B01J20/02B01J20/18B01J2220/42B01J2220/4806
Inventor 贺德华褚泰伟房超刘会敏程庆辉杨维维李泽军朱秋锋李宇明吴昊
Owner TSINGHUA UNIV
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