Multilayer radon-reducing covering material and application thereof, and method for reducing radon exhalation rate of waste rock heap of uranium mine

A technology of covering materials and waste rock piles is applied in the field of decommissioning and treatment of nuclear facilities, which can solve the problems of low radon reduction rate, and achieve the effects of reducing gamma radiation dose, reducing radon precipitation rate, and facilitating vegetation restoration.

Pending Publication Date: 2022-08-09
BEIJING RES INST OF URANIUM GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Ye Weirong et al. (See: Ye Weirong, Huang Qiang. Research on using loess to cover waste rock piles to reduce radon precipitation rate [J]. Industrial Safety and Dust Control, 1991, (10): 9-10.) used loess as covering

Method used

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  • Multilayer radon-reducing covering material and application thereof, and method for reducing radon exhalation rate of waste rock heap of uranium mine
  • Multilayer radon-reducing covering material and application thereof, and method for reducing radon exhalation rate of waste rock heap of uranium mine
  • Multilayer radon-reducing covering material and application thereof, and method for reducing radon exhalation rate of waste rock heap of uranium mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The surface of the uranium mine waste rock pile is covered with bentonite in turn and compacted to obtain a bentonite layer with a thickness of 4 cm and a compaction degree of 10%;

[0042] The surface of the bentonite layer is covered with loess and then compacted to obtain the first loess layer with a thickness of 13 cm and a compaction degree of 10%;

[0043] The surface of the first loess layer is covered with loess and then compacted to obtain a second loess layer with a thickness of 18 cm and a compaction degree of 10%;

[0044] Among them, the loess was collected from the soil source of Shahuqiao, Nanjing Town, Quannan County, Ganzhou City, Jiangxi Province, and the radon precipitation rate of the loess was 0.01-0.29Bq / (m 2 s), the gamma radiation dose rate is (21.7~25.4)×10 -8 Gy / h; the radon precipitation rate of bentonite is 0.02~0.12Bq / (m 2 s), the gamma radiation dose rate is (24.6~29.3)×10 -8 Gy / h.

Embodiment 2～10

[0046] According to the method of Example 1, the surface of the uranium mine waste rock pile was covered with a covering material. The compositions of the covering materials in Examples 2 to 9 are shown in Table 1.

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Abstract

The invention relates to the technical field of decommissioning treatment of nuclear facilities, in particular to a multilayer radon-reducing covering material, application thereof and a method for reducing the radon exhalation rate of a waste rock heap of a uranium mine. The invention provides a multi-layer radon-reducing covering material. The multi-layer radon-reducing covering material comprises a bentonite layer, a first loess layer located on the surface of the bentonite layer and a second loess layer located on the surface of the first loess layer. The bentonite is used as a bottom layer soil covering material, has high adsorption capacity on radon, effectively prevents radon nuclide migration, can reduce the thickness and compactness of covering soil, can be applied to waste rock piles where mechanical equipment is difficult to reach and construction areas where the common soil compactness cannot meet design requirements, and has wide application prospects. The method has a good decommissioning treatment effect on uranium mine waste rock piles; the loess is adopted as the middle-layer covering material and the top-layer covering material, the radon exhalation rate reduction effect and the gamma radiation reduction effect can be further improved, the treatment cost is low, and later vegetation recovery is facilitated.

Description

technical field [0001] The invention relates to the technical field of decommissioning and treatment of nuclear facilities, in particular to a multi-layer radon reducing covering material and its application, and a method for reducing the radon precipitation rate of uranium mine waste rock piles. Background technique [0002] With the vigorous development of the current nuclear industry and nuclear power, environmental problems arising from the decommissioning of many nuclear facilities have aroused great concern. The decommissioning of uranium mining and metallurgical facilities is an important part of the decommissioning of nuclear facilities. Because of the variety of natural radioactive elements, high toxicity, long life, large amount of waste, and close connection with residents, the task of uranium mining and metallurgy facilities is more complicated and arduous. . So far, more than 40 billion tons of uranium waste rock and more than 20 billion tons of uranium tailing...

Claims

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Application Information

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IPC IPC(8): E02D3/046G21F1/02G21F1/12
CPCE02D3/046G21F1/02G21F1/12
Inventor 李娜娜
Owner BEIJING RES INST OF URANIUM GEOLOGY
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