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选取我国南方某铀尾矿库的自然尾矿样品,分析了其粒径分布和主要化学成分,设计并制作了测定铀尾矿氡析出率的室内试验装置,采用RAD7氡检测仪测定氡浓度,SM200水分仪测定铀尾矿的体积含水率,并阐述了试验步骤。采用对照试验的方法研究了体积含水率对铀尾矿氡析出率的影响规律。结果表明,随着体积含水率的增加,氡的析出率先上升,当铀尾矿体积含水率达到10%~12%时,氡析出率最高;之后,氡析出率随着铀尾矿体积含水率增加而下降。
The natural tailings samples of a uranium tailing pond in southern China were selected to analyze the particle size distribution and the main chemical components. An indoor test device for the determination of radon exhalation rate of uranium tailings was designed and manufactured. Radon concentration was measured by RAD7 radon detector, SM200 moisture meter determination of the volumetric moisture content of uranium tailings, and set out the test procedure. The effect of volumetric water content on the radon exhalation rate of uranium tailing was studied by the method of comparative experiment. The results show that with the increase of volumetric water content, the precipitation rate of radon firstly increases. When the volumetric moisture content of uranium tailings reaches 10% ~ 12%, the radon exhalation rate is the highest. After that, the radon precipitation rate changes with the volumetric water content of uranium tailing Increase and decline.