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Decontamination electrolyte and decontamination method

An electrolyte and electrochemical technology, which is applied in the field of radioactive pollutant treatment, can solve problems such as difficult treatment and large output of decontamination waste liquid

Inactive Publication Date: 2019-09-20
LINGDONG NUCLEAR POWER +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decontamination electrolyte used in the traditional electrochemical method has a good decontamination effect, but the decontamination electrolyte contains components that are incompatible with the nuclear power plant radioactive waste treatment system, such as phosphate, sulfate and chloride ions, etc., resulting in decontamination. The output of sewage and waste liquid is large and difficult to handle

Method used

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  • Decontamination electrolyte and decontamination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0032] The decontamination method of one embodiment, comprises the following steps:

[0033] The workpiece to be decontaminated is subjected to electrochemical removal treatment with the above-mentioned decontamination electrolyte.

[0034] Specifically, the workpiece to be decontaminated is placed in the above-mentioned decontamination electrolyte for electrochemical decontamination treatment to obtain a decontaminated workpiece. Further, the workpiece to be decontaminated is placed as an anode in the decontamination electrolyte, and the power is turned on for electrolysis to obtain a decontaminated workpiece.

[0035] In one of the embodiments, the current density of the electrochemical decontamination treatment is 1000A / m 2 ~1200A / m 2 . Preferably, the current density of the electrochemical decontamination treatment is 1100A / m 2 ~1200A / m 2 . In one embodiment, the temperature of the electrochemical decontamination treatment is 30°C-50°C. Preferably, the temperature o...

specific Embodiment

[0041] The following will be described in detail in conjunction with specific embodiments. The following examples do not include other components except unavoidable impurities unless otherwise specified. The drugs and instruments used in the examples are all routine choices in the art unless otherwise specified. The experimental methods for which specific conditions are not indicated in the examples are implemented according to conventional conditions, such as the conditions described in literature, books or the method recommended by the manufacturer.

Embodiment

[0043] (1) Use water as a solvent to prepare the decontamination electrolytes of Examples 1 to 8, wherein the components of the decontamination electrolytes of each embodiment and the content of each component in the decontamination electrolyte are as shown in Table 1 .

[0044] (2) Take 24 workpieces to be decontaminated, weigh and record the mass of the sample (the size of the sample is: length*width*thickness=50mm*10mm*3mm), and then randomly divide them into 8 groups, each group corresponds to a In an embodiment, electrochemical decontamination treatment is performed. Specifically, the workpiece to be decontaminated is Z2CN18.10 austenitic stainless steel, the workpiece to be decontaminated is an anode, a titanium plate is selected as a cathode, and the current density is 1000A / m 2 , the temperature of the electrolyte is 40° C., and the time of the electrochemical decontamination treatment is 10 min. After the electrochemical decontamination treatment, the workpieces sub...

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Abstract

The invention relates to a decontamination electrolyte and a decontamination method. The decontamination electrolyte comprises nitric acid with the final mass percentage of 4-8%, nitrate with the final concentration of 10-35g / L and oxalate with the final concentration of 3-9g / L. Through joint efforts of the nitric acid, the nitrate and the oxalate, the decontamination electrolyte can efficiently remove radioactive pollutants on the surface of metal. Moreover, the decontamination electrolyte is compatible with a radioactive waste liquid treatment system, a small amount of secondary waste liquid is generated, the decontamination effect is good, and waste liquid can be conveniently treated.

Description

technical field [0001] The invention relates to the technical field of radioactive pollutant treatment, in particular to a decontamination electrolyte and a decontamination method. Background technique [0002] Nuclear facilities are contaminated with radioactive material during operation, making them radioactive. When it is necessary to maintain or decommission nuclear facilities, in order to ensure the health and safety of operators and the public, and reduce the potential release of radioactive substances, it is necessary to decontaminate nuclear facilities contaminated by radioactive substances. These contaminated metals Most of the contamination forms are surface contamination. [0003] At present, electrochemical methods are mainly used to remove radioactive contamination from the surface of nuclear facilities. Electrochemical method is a method of removing radioactive pollutants on the surface of conductive materials through electrochemical action. One of the cores...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F1/00
CPCC25F1/00
Inventor 赵滢何小平张惠炜张伟姜磊洪振旻王浩宇张宇宏何继强彭珍琳
Owner LINGDONG NUCLEAR POWER
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