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

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...

AI Technical Summary

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 material, Among them, the loess with loess texture has the best radon reduction effect; however, the loess with loess texture with a thickness of 50 cm has a radon reduction rate of only 18.7%, which is a low radon reduction rate.

Images