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Ultrasonic electrolysis based automatic decontamination system for removing radioactive surface contamination

A decontamination system and surface contamination technology, used in radioactive purification, nuclear engineering, etc., can solve the problems of difficult production, low decontamination efficiency, and unsatisfactory uranium decontamination effect.

Inactive Publication Date: 2016-11-23
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The China Academy of Engineering Physics has developed a mobile electrolytic decontamination device, which uses a nitric acid decontamination system to electrolytically decontaminate metals contaminated with uranium and plutonium. The average decontamination efficiency of plutonium contamination on the surface is 99.8%, and the decontamination efficiency of uranium is about 94.8%. It shows that the decontamination efficiency of fragment nuclides is not high, and new secondary waste is produced, and the waste liquid needs further treatment
[0004] The China Academy of Engineering Physics has also developed a dry coating electrolytic decontamination device. The decontamination effect of this device is good, and the amount of waste generated is small and easy to handle. However, the supporting coating film must be conductive and difficult to produce.
[0005] The Chinese Academy of Radiation Protection has used electrochemical decontamination technology to carry out corresponding research on the removal of radioactive surface contamination and engineering application research, and has obtained certain research results, but the decontamination efficiency is not high, the scope of application is narrow, and the residual chemical waste liquid on the surface will cause pollution. lead to pollution transfer

Method used

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  • Ultrasonic electrolysis based automatic decontamination system for removing radioactive surface contamination
  • Ultrasonic electrolysis based automatic decontamination system for removing radioactive surface contamination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a. Place the object to be decontaminated in the decontamination tank Ⅰ and power on, the decontamination solution is nitric acid solution, and the surface of the object to be decontaminated is decontaminated by electrolysis;

[0039] b. The ultrasonic frequency of ultrasonic generator Ⅰ is 28kHz, the ultrasonic frequency of ultrasonic generator Ⅱ is 40kHz, and the ultrasonic frequency of ultrasonic generator Ⅲ is 50kHz. First turn on the ultrasonic generator Ⅰ, decontaminate by ultrasonic for 10min, then turn on the ultrasonic generator Ⅱ, decontaminate 10 minutes, after the decontamination is completed, turn on the ultrasonic generator III, decontaminate for 10 minutes, and the decontaminated object becomes the object Ⅰ;

[0040] c. The object I enters the decontamination tank II through the automatic conveyor belt I for heating and soaking, and the decontamination solution is citric acid to further remove the surface pollution of the object I and become the object II; ...

Embodiment 2

[0044] a. Place the object to be decontaminated in the decontamination tank Ⅰ and power on, the decontamination solution is sodium hydroxide solution, and the surface of the object to be decontaminated is decontaminated by electrolysis;

[0045] b. The ultrasonic frequency of ultrasonic generator Ⅰ is 28kHz, the ultrasonic frequency of ultrasonic generator Ⅱ is 40kHz, and the ultrasonic frequency of ultrasonic generator Ⅲ is 50kHz. First turn on the ultrasonic generator Ⅰ, decontaminate by ultrasonic for 10min, then turn on the ultrasonic generator Ⅱ, decontaminate 10 minutes, after the decontamination is completed, turn on the ultrasonic generator III, decontaminate for 10 minutes, and the decontaminated object becomes the object Ⅰ;

[0046] c. The object I enters the decontamination tank II through the automatic conveyor belt I for heating and soaking, and the decontamination solution is citric acid to further remove the surface pollution of the object I and become the object I...

Embodiment 3

[0050] a. Place the object to be decontaminated in the decontamination tank Ⅰ and power on, the decontamination solution is hydrogen peroxide solution, and the surface of the object to be decontaminated is decontaminated by electrolysis;

[0051] b. The ultrasonic frequency of ultrasonic generator Ⅰ is 28kHz, the ultrasonic frequency of ultrasonic generator Ⅱ is 40kHz, and the ultrasonic frequency of ultrasonic generator Ⅲ is 50kHz. First turn on the ultrasonic generator Ⅰ, decontaminate by ultrasonic for 10min, then turn on the ultrasonic generator Ⅱ, decontaminate 10 minutes, after the decontamination is completed, turn on the ultrasonic generator III, decontaminate for 10 minutes, and the decontaminated object becomes the object Ⅰ;

[0052] c. The object Ⅰ enters the decontamination tank Ⅱ through the automatic conveyor belt Ⅰ for heating and soaking. The decontamination solution is ferrous sulfate, and the surface pollution of the object Ⅰ is further removed to become the o...

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Abstract

The invention discloses an ultrasonic electrolysis based automatic decontamination system for removing radioactive surface contamination. According to electrochemical principles, an object to be decontaminated is taken as an anode, the wall of a first decontamination pit is taken as a cathode, contaminant is dissolved uniformly by the aid of chemical decontamination solution, contamination nuclide is dissolved in the decontamination solution, then ultrasonic decontamination is carried out repeatedly; and further, the object is heated and soaked and finally is sprayed and then dried by a spraying and drying measurement device; after radioactive surface contamination index of the object to be decontaminated is detected, whether the object is needed to be decontaminated again or not is determined; the decontamination work is finished until the surface of the object to be decontaminated reaches the radioactive surface contamination control index. The ultrasonic electrolysis based automatic decontamination system realizes surface decontamination, automatic drying, online monitoring, conveying and recovering of the object to be decontaminated, and has effect of reducing dispersion of radioactive contamination. Besides, emission of radioactive waste liquid is reduced by reuse of the decontamination solution, work efficiency is improved, labor intensity of working personal is reduced, and exposure dose of the working personal is lowered.

Description

technical field [0001] The invention belongs to the technical field of radiation protection and environmental protection, and in particular relates to an ultrasonic electrolysis automatic decontamination system for removing radioactive surface pollution. Background technique [0002] The decontamination of radioactive surface contamination usually adopts chemical decontamination and physical decontamination. Common chemical decontamination uses chemical solvents (organic solvents, acid solutions, complex solutions, salt solutions, etc.) to clean contaminated surfaces, etc.; physical methods include surface wiping, surface peeling, etc.; with the development of technology, radioactive pollution decontamination has been applied A variety of modern physical and chemical means, such as ultrasound, plasma, laser, etc., electrochemical technology is no exception. Sandia and Los Alamos Laboratories in the United States reported the application of electrochemical decontamination to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/00
CPCG21F9/002
Inventor 谢云张东余卫国石正坤成琼
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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