低频振动对高温类铀矿岩氡析出规律的影响研究
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摘要
为了研究铀矿山采掘作业低频振动对高温铀矿围岩氡析出规律的影响,选取南方某铀尾矿砂、石英砂等原材料制备类铀矿岩试块,基于正交试验原理设计0~40 Hz与30~50℃两种因素条件下共计25组对比试验。试验结果表明:在一定时间范围内,单因素测量条件下低频振动与高温加热对试块的氡析出率均有提升作用,但是随着振动频率的上升,氡析出率会呈现一个先增大后减小的趋势,30 Hz时氡析出率达到最大值;在低频振动与高温持续加热耦合作用下,氡析出率变化呈三维立体曲面,在曲面振动频率30 Hz、试块测量温度为50℃位置时氡析出率达到最大值,试验结论可为铀矿井氡防护优化提供一定的参考。
The purpose of the research is to study the effects of low-frequency vibration of uranium mining operations on the radon exhalation of uranium ore under high temperature. Uranium tailing sand from a certain uranium mine in South China,quartz sand and other materials were selected to prepare the uranium-like rocks. Based on the principle of orthogonal experiment,the cumulative radon concentration were measured at the total of 25 control experiments designed under the conditions of 0 ~ 40 Hz and 30 ~ 50 ℃. Test results show that,under the condition of single factor measurement in a certain time range,low frequency vibration and high temperature heating have a positive effect on the radon exhalation rate of the test rock. However,as the vibration frequency increases,the radon exhalation rate will first increase and then decrease,and when the frequency reaches 30 Hz,the radon exhalation rate reaches the maximum value. Under low-frequency vibration and constant high-temperature coupling,the radon exhalation rate change shows three-dimensional surface and when the surface vibration frequency is 30 Hz and the rock measurement temperature is stayed at 50 ℃,the radon exhalation rate can reach the maximum. The experimental conclusions can provide a theoretical basis for radon protection in the process of uranium mining.
The purpose of the research is to study the effects of low-frequency vibration of uranium mining operations on the radon exhalation of uranium ore under high temperature. Uranium tailing sand from a certain uranium mine in South China,quartz sand and other materials were selected to prepare the uranium-like rocks. Based on the principle of orthogonal experiment,the cumulative radon concentration were measured at the total of 25 control experiments designed under the conditions of 0 ~ 40 Hz and 30 ~ 50 ℃. Test results show that,under the condition of single factor measurement in a certain time range,low frequency vibration and high temperature heating have a positive effect on the radon exhalation rate of the test rock. However,as the vibration frequency increases,the radon exhalation rate will first increase and then decrease,and when the frequency reaches 30 Hz,the radon exhalation rate reaches the maximum value. Under low-frequency vibration and constant high-temperature coupling,the radon exhalation rate change shows three-dimensional surface and when the surface vibration frequency is 30 Hz and the rock measurement temperature is stayed at 50 ℃,the radon exhalation rate can reach the maximum. The experimental conclusions can provide a theoretical basis for radon protection in the process of uranium mining.
引文
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[2]TUCCIMEI P,MOLLO S,VINCIGUERRA S,et al.Radon and thoron emission from lithophysae-rich tuff under increasing deformation:An experimental study[J].Geophysical Research Letters,2010,37(5):53-57.
[3]MOLLO S,TUCCIMEI P,HEAP M J,et al.Increase in radon emission due to rock failure:An experimental study[J].Geophysical Research Letters,2011,38(14):130-137.
[4]PLENDERLEITH,STEWART J M,PRETORINS B C B,et al.Recirculation of air in the ventilation and cooling of deep gold mine[C].Inst of mine&Metellury,1984,291-299.
[5]陈安国.矿井热害产生的原因、危害及防治措施[J].中国安全科学学报,2004,14(8):6-9.
[6]蔡胜伟.滚筒采煤机固有频率的计算机仿真[J].煤矿机械,2006,27(9):110-111.
[7]田晶.纵轴式掘进机动态模型与动态特性的研究[D].辽宁阜新:辽宁工程技术大学,2002.