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Method for cleaning and decontaminating radioactive contaminated soil

A soil and cleaning agent technology, which is applied in the restoration of contaminated soil, radioactive purification, nuclear engineering, etc., can solve the problems of different nuclide existence states and the difficulty of cleaning and decontamination, so as to reduce production, effectively clean, Realize the effect of volume reduction treatment

Active Publication Date: 2022-02-11
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are very few technologies for cleaning and decontaminating radioactively contaminated soil, and the amount of radioactively contaminated soil waste is huge, and the types and existing states of polluting nuclides are different, so it is very difficult to clean and decontaminate it

Method used

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  • Method for cleaning and decontaminating radioactive contaminated soil
  • Method for cleaning and decontaminating radioactive contaminated soil
  • Method for cleaning and decontaminating radioactive contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Take 400kg of soil samples to be treated, and complete the feeding in two times, 200kg each time, the soil enters the mud hopper, and at the same time, water is supplied to the mud hopper through the mud hopper water supply pump, and the plant ash in the soil sample is removed by washing flotation , activated carbon, concrete ash and other impurities, get the soil material after impurity removal treatment, and the waste water containing impurities enters the neutral thickener;

[0074] (2) The soil material after the impurity removal treatment enters the double-layer vibrating screen, and the soil particles are divided into the first soil particles with a particle size greater than 2mm, the second soil particles with a particle size of 0.125-2mm, and the second soil particles with a particle size of less than 0.125mm. Three soil particles; the third soil particles form mud with wet sieving water and enter the neutral thickener for the first flocculation stratificatio...

Embodiment 2～18

[0080]The method of Example 1 is adopted, the only difference being that 300 L of used cleaning agent is discharged and 300 L of new cleaning agent is added each time the sample is added to obtain soils 2-18 after cleaning.

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Abstract

The invention relates to a method for cleaning and decontaminating radioactive contaminated soil. The method comprises the following steps: screening the radioactive contaminated soil into large-particle-size soil particles, medium-particle-size soil particles and small-particle-size soil particles; and then, rinsing the large-particle-size soil particles, grinding, cleaning and soaking the medium-particle-size soil particles, and carrying out flocculation and precipitation on the small-particle-size soil particles, so that classification and cleaning of contaminated soil with different radioactivity degrees are effectively achieved, the cleaning agent can be recycled in the cleaning process, and the output of liquid waste in the soil cleaning process is remarkably reduced. The method is easy to operate and high in decontamination efficiency, radioactive contaminated soil is effectively cleaned, the cleaning operation cost is saved to the maximum extent, volume reduction treatment is achieved, unification of the cleaning efficiency and economic benefits is achieved, and high applicability and generalization performance are achieved.

Description

technical field [0001] The present disclosure relates to the field of soil purification, in particular to a method for cleaning and decontaminating radioactively contaminated soil. Background technique [0002] During the operation of nuclear facilities, due to various reasons, such as nuclear accidents, leakage of waste liquid pipelines, and wrong discharge of waste liquids, soil radioactive pollution is caused. These radionuclides will further migrate, diffuse, and infiltrate with changes in natural conditions. into the surrounding environment, causing long-term serious harm to the ecological environment and human health. With the decommissioning of my country's military nuclear facilities and the substantial development and utilization of nuclear energy, the problem of soil radionuclide pollution will become more severe. The amount of radioactively contaminated soil waste is huge, and the types and states of the polluting nuclides are different. It is very difficult to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02G21F9/30
CPCB09C1/02G21F9/304
Inventor 郑佐西张怡朱欣研鲜亮李欣闱
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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