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Radioactive waste metal recovery method

A recycling method and technology for radioactive waste, applied in the field of radioactive waste metal recycling, can solve the problems of difficult recycling of radioactive waste metal, poor decontamination effect, etc., and achieve the effect of good decontamination effect, easy operation, and easy collection and processing.

Active Publication Date: 2021-01-05
SICHUAN ENVIRONMENTAL PROTECTION ENG CO LTD CNNC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current electrochemical decontamination is still poor in decontamination effect, making it difficult to effectively recycle radioactive waste metals

Method used

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  • Radioactive waste metal recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Prepare electrolytic solution for electrochemical decontamination, wherein: phosphoric acid: 75wt%, oxalic acid: 5g / L, citric acid: 5g / L, tartaric acid: 1g / L, hydrogen peroxide: 3g / L, glacial acetic acid: 6g / L, the solvent is water.

[0042] (2) Put 1L of electrolyte in the electrochemical decontamination device, and soak the radioactively contaminated waste stainless steel parts (called parts to be decontaminated) in the electrolyte, connect the parts to be decontaminated to the anode of the power supply, and turn on the power, Adjust the voltage to 12V, electrochemically treat the parts to be decontaminated, and the current density is 0.4A / cm 2 , the processing time is 20min. After the electrochemical decontamination is completed, the decontaminated parts are transferred to a two-stage ultrasonic decontamination device for ultrasonic cleaning, the ultrasonic frequency is 28KHz, and the single-stage ultrasonic cleaning time is 20min.

[0043] (3) Take out the pa...

Embodiment 2

[0048] (1) Electrolyte for preparing electrochemical decontamination, wherein: phosphoric acid: 60wt%, oxalic acid: 5g / L, citric acid: 5g / L, tartaric acid: 1g / L, hydrogen peroxide: 3.75g / L, glacial acetic acid: 6g / L, the solvent is water.

[0049] (2) Put 1L of electrolyte in the electrochemical decontamination device, and soak the radioactively contaminated waste stainless steel parts (called parts to be decontaminated) in the electrolyte, connect the parts to be decontaminated to the anode of the power supply, and turn on the power, Adjust the voltage to 12V, electrochemically treat the parts to be decontaminated, and the current density is 0.4A / cm 2 , the processing time is 20min. After the electrochemical decontamination is completed, the decontaminated parts are transferred to a two-stage ultrasonic decontamination device for ultrasonic cleaning, the ultrasonic frequency is 28KHz, and the single-stage ultrasonic cleaning time is 20min.

[0050] (3) Take out the parts af...

Embodiment 3

[0055] (1) Electrolyte for preparing electrochemical decontamination, wherein: phosphoric acid: 65wt%, oxalic acid: 5g / L, citric acid: 6g / L, tartaric acid: 1g / L, hydrogen peroxide: 3.75g / L, glacial acetic acid: 8g / L, the solvent is water.

[0056] (2) Put 1L of electrolyte in the electrochemical decontamination device, and soak the radioactively contaminated waste stainless steel parts (called parts to be decontaminated) in the electrolyte, connect the workpiece to be decontaminated to the anode of the power supply, and turn on the power supply, Adjust the voltage to 24V, electrochemically treat the parts to be decontaminated, and the current density is 0.3A / cm 2 , the temperature treatment time is 15min. After the electrochemical decontamination is completed, the decontaminated parts are transferred to a two-stage ultrasonic decontamination device for ultrasonic cleaning, the ultrasonic frequency is 40KHz, and the single-stage ultrasonic cleaning time is 20min.

[0057] (3)...

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Abstract

The invention relates to the technical field of radioactive waste treatment, and provides a radioactive waste metal recovery method. The method includes the steps that electrochemical decontamination,ultrasonic cleaning, and water washing are sequentially carried out on radioactive waste metal; smelting is carried out on the washed waste metal; and an electrolyte for electrochemical decontamination is an aqueous solution, and solutes comprises phosphoric acid, oxalic acid, citric acid, tartaric acid, hydrogen peroxide, and glacial acetic acid. The radioactive waste metal recovery method has agood decontamination effect on the radioactive waste metal and is easy to operate, and the decontaminated waste metal can be effectively recycled through smelting. Furthermore, according to the method, substances removed in the decontamination process exist in the form of precipitates and are easy to collect and treat, and generated secondary waste liquid and the precipitates are subjected to glass solidification treatment, so that the minimization of the waste is realized.

Description

technical field [0001] The invention relates to the technical field of radioactive waste treatment, in particular to a method for recycling radioactive waste metal. Background technique [0002] Human nuclear activities include the nuclear industry, civil nuclear technology, scientific research and technology, etc. All of these processes involve radioactive materials, and the materials they come into contact with are contaminated by radionuclides. During nuclear activities, when nuclear facilities need to be maintained or decommissioned, they need to be decontaminated to reduce occupational exposure, reduce potential release of radioactive substances, and decontaminate old facilities. Metal materials commonly used in nuclear facilities include stainless steel and carbon steel, among which stainless steel materials are often used to store and transport strong radioactive pollutants. [0003] Recycling radioactive waste metal can save resources and reduce the amount of waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/56C25F1/00G21F9/00G21F9/30G21F9/34
CPCC21C5/562C25F1/00G21F9/34G21F9/30G21F9/004G21F9/002G21F9/001Y02P10/134
Inventor 徐立国张锡东徐卫东刘小贞
Owner SICHUAN ENVIRONMENTAL PROTECTION ENG CO LTD CNNC
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