Study on radon control performance of mulch on beach surface of uranium tailings reservoirs under low frequency vibration

doi:10.16265/j.cnki.issn1003-3033.2022.03.021

Abstract

Abstract:

In order to study safety of uranium tailings reservoir beach and its surrounding area, numerical analysis and experimental simulation were utilized to find the mulch with good radon control performance. With a uranium tailings in south China as an example, effects of three kinds of covering materials (zeolite, gypsum powder and fly ash) on radon exhalation from beach surface of the reservoir were compared, and the best material was selected. Then, radon control experiments under 15,20,25 Hz frequency cumulative vibration were conducted to verify difference in control performance of the mulch. The results show that different mulches have different effects in inhibiting radon exhalation rate, and for the case of same mulch depth, addition of zeolite layer to covering material results in better performance in restraining radon exhalation rate than that of gypsum powder or fly ash layer. With the increase of vibration frequency, radon control performance will be more remarkable.

Key words: low frequency vibration, uranium tailings reservoir beach, radon control performance, mulch, radon exhalation rate, zeolite

LIU Jiehao, LIU Yong, HONG Changshou, XU Zhenghua. Study on radon control performance of mulch on beach surface of uranium tailings reservoirs under low frequency vibration[J]. China Safety Science Journal, 2022, 32(3): 152-157.

Figures/Tables 9

Tab.1

Tab.2

Chemical composition of ore in a uranium mining area in south China%

样品	$W (S i O 2)$	$W (A l 2 O 3)$	$W (F e 2 O 3)$	W_(FeO)	$W (K 2 O)$	$W (N a 2 O)$	W_(CaO)	W_(MgO)	$W (T i O 2)$	W_U	Ra/(Bq·g^-1)
矿石	80.54	10.21	2.71	0.73	4.20	0.11	0.33	0.30	0.15	0.14	28.65
尾矿	81.18	9.54	3.38	0.14	3.99	0.13	0.17	0.08	0.13	0.04	33.79

Tab.2

Fig.1

Fig.2

Tab.3

Fig.3

Fig.4

Fig.5

Fig.6

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国家	氡析出率/ (Bq·m^-2·s^-1)	γ外照剂量率/ (μGy·h^-1)	公众计量/ (mSv·a^-1)	年均氡子体α潜能浓度/(μJ·m^-3)	尾矿库安全年限/a
中国	0.74	0.2	0.25	0.02(≤0.03)	100
俄罗斯	0.74	2.5×10³	1.0	—	—
德国	0.74	0.2	1.0	20	300
美国	0.74	本底+0.17	0.1	0.02(≤0.03)	1 000
法国	1.0	0.2	—	250	—
加拿大	—	—	1.0	0.02	1 000
澳大利亚	0.74	0.2	1.0	0.02(≤0.03)	300

覆盖层情况	裸砂覆盖层	添加不同覆盖材料的覆盖层
覆盖层情况	氡析出率/ (Bq·m^-1·s^-1)	氡析出率/ (Bq·m^-1·s^-1)	氡降低系数
沸石	0.25	0.07	3.57
粉煤灰		0.13	1.92
石膏粉		0.14	1.78