Electrochemical decontamination electrolyte and preparation method and application thereof
一种电解液、电化学的技术,应用在电化学去污电解液及其制备领域,能够解决二次废液难以处理、去污效果差、电解液不适用等问题,达到放射性污染小的效果
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[0031] The present invention provides a method for preparing the electrochemical decontamination electrolyte described in the above scheme, comprising the following steps: mixing phosphoric acid, oxalic acid, citric acid, tartaric acid, hydrogen peroxide, glacial acetic acid and water to obtain the electrochemical decontamination electrolyte.
[0032] The present invention has no special requirements on the mixing method. Using a mixing method well known to those skilled in the art can completely dissolve each raw material and mix them uniformly; the reagents used to prepare the electrolyte are preferably industrially pure reagents.
[0033] The present invention also provides the application of the electrochemical decontamination electrolyte described in the above scheme in the decontamination of radioactively polluted waste stainless steel. In a specific embodiment of the present invention, the application is preferably: adding an electrochemical decontamination electrolyte i...
Embodiment 1
[0038] The electrochemical decontamination electrolyte of the present invention is used to electrochemically decontaminate radioactively contaminated waste stainless steel. The electrolyte used consists of: phosphoric acid: 60wt%, oxalic acid: 5g / L, citric acid: 2g / L, tartaric acid: 1g / L, hydrogen peroxide: 2.5g / L, glacial acetic acid: 5g / L, solvent is water.
[0039] Add an appropriate amount of the above-mentioned electrolyte in the electrolytic cell, immerse the part of the radioactively contaminated stainless steel sheet to be decontaminated in the electrolyte, connect the radioactively contaminated stainless steel sheet to the anode, and use a 24V pulse power supply with a current density of 0.5-2A / cm 2 , electrolyze for 120s, and then use deionized water to rinse the decontaminated stainless steel sheet. The measured weight loss of the stainless steel sheet is 6.4mg / cm 2 , the measured surface radioactivity level of stainless steel sheet is: α pollution is lower than t...
Embodiment 2
[0042] Adopt electrochemical decontamination electrolyte solution of the present invention to carry out electrochemical decontamination to radioactively polluted waste stainless steel, the composition of adopted electrolyte solution is: phosphoric acid: 45%, oxalic acid: 5g / L, citric acid: 10g / L, tartaric acid: 2g / L, hydrogen peroxide: 2.5g / L, glacial acetic acid: 5g / L, solvent is water.
[0043] The operating method of electrolytic decontamination is the same as that of Example 1, and the weight loss of the stainless steel sheet measured is 8.0 mg / cm 2 , the measured radioactivity level on the surface of the rust steel sheet is: α pollution is lower than the detection line, β pollution 2 , meeting the reuse requirements.
[0044] The waste liquid and waste slag produced by electrolysis are sent to the vitrification system for the preparation of iron phosphate glass.
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