Method for separating nuclides from radioactive waste engine oil

A radioactive waste and separation method technology, applied in radioactive purification, nuclear engineering, etc., can solve the problems that radioactive waste engine oil cannot be formally treated, the incineration tail gas treatment is difficult, and the emulsification-solidification method has a large volume increase, etc., to achieve radioactive waste The effects of management minimization, reduction of fire hazards, reduction of possibility of radioactive leakage

Pending Publication Date: 2019-06-07
CHINA INST FOR RADIATION PROTECTION +1
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  • Claims
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Problems solved by technology

Although the above method can treat radioactive waste engine oil, the tail gas treatment of the incineration method is difficult and has a great impact on the environment, which has been increasingly opposed; the adsorption method has high requirements on the performance of the adsorbent, and there is no high-efficiency adsorbent that can be independently produced in China. It needs to be imported from abroad, and the processing cost is high; the emulsification-solidification method has a large volume increase, and the development of emulsifiers is not yet mature, and the performance of the solidified body needs to be verified, so it cannot be officially used for the treatment of radioactive waste engine oil

Method used

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  • Method for separating nuclides from radioactive waste engine oil

Examples

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Effect test

Embodiment 1

[0040] The radioactive waste engine oil was taken from the No. 2 waste engine oil storage tank of Daya Bay Nuclear Power Plant. The heating temperature was 160°C and the heating reaction time was 7 days. During the reaction process, the surface of the catalytic copper was covered with black engine oil sludge, and the color of the waste engine oil turned dark black.

[0041] After the reaction, the radioactive waste engine oil is filtered with a filtration accuracy of 2μ. The quality of the final separated filter residue is about 1 / 10 of the quality of the waste engine oil. The radioactivity of the waste engine oil is measured by a gamma spectrometer. The radioactivity level is reduced by about 120 times. The final radioactivity The activity concentration is less than the relevant exemption limit specified in the "Activity Concentration of Radionuclide in Materials Exempt from Radiation Supervision" (GB27742-2011).

example 2

[0043] The radioactive waste engine oil was taken from the No. 2 waste engine oil storage tank of the Daya Bay Nuclear Power Plant. The heating reaction time was 12 days, and the heating temperature was 140°C and 160°C. After the reaction is filtered, the filtering accuracy is 2μ. The radioactivity of the filtered waste engine oil is measured by a gamma spectrometer. The radioactivity level is reduced by about 10 times and 180 times, respectively. The effect of temperature on the removal of radionuclides can be seen: 160℃>>140℃ .

example 3

[0045] The radioactive waste engine oil was taken from the No. 2 waste engine oil storage tank of Daya Bay Nuclear Power Plant. The heating temperature was 160℃, and the heating reaction time was 12 days. After the reaction, the waste engine oil was filtered with a precision of 80μ, 50μ, 30μ, 5μ and 2μ, and then passed through the gamma spectrum. The instrument measures radioactivity, and the radioactivity levels are reduced by about 1.5, 3.6, 11.4, 72.3 and 79.4 times respectively.

[0046] Different from the features of the prior art, the present invention provides a method for separating radionuclides in radioactive waste engine oil, which utilizes the characteristics of the catalytic oxidation of waste engine oil to produce engine oil sludge that carries radionuclides and realizes the concentration of radionuclides in radioactive waste engine oil. With separation treatment, the waste engine oil is released and controlled, and the danger of radioactive waste is reduced to a nea...

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Abstract

The invention relates to a method for separating nuclides in radioactive waste engine oil. The method comprises the following steps: (1) adding a catalyst and an oxidant into the radioactive waste engine oil; (2) stirring the mixture, and heating the mixture at constant temperature for a preset time; (3) discharging the radioactive waste engine oil into an oil sludge settling tank, and cooling theoil sludge to room temperature; (4) filtering the oil sludge to obtain the treated radioactive waste engine oil. According to the method, the radioactive waste engine oil can be cleaned and uncontrolled, the risk of radioactive waste is reduced to be close to the zero risk level, and meanwhile the volume is greatly reduced.

Description

Technical field [0001] The invention belongs to the technical field of radioactive waste treatment and disposal, and particularly relates to a method for separating radionuclides in radioactive waste engine oil. Background technique [0002] With the development of society and economy, the demand for power resources is increasing, and nuclear power as an efficient and clean energy source has been paid more and more attention. However, while bringing huge economic benefits to people, the disposal of radioactive waste generated during the operation of nuclear power plants has become increasingly serious. [0003] Lubricating oil, hydraulic oil, etc. are commonly used in the operation and maintenance of related wear equipment in nuclear power plants. These oil products will inevitably be contaminated during use, so they become radioactive waste oil when they are replaced for reasons such as service life or performance degradation. It has a certain specific radioactivity activity and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/20G21F9/06
Inventor 刘建琴王宇飞赵滢邓才远安鸿翔何小平高超张惠炜郭喜良柳兆峰万勇闫晓俊冯文东
Owner CHINA INST FOR RADIATION PROTECTION
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