堆浸铀矿堆氡析出规律的实验研究

堆浸铀矿堆是铀矿山大气氡的主要来源之一。为了揭示堆浸过程中矿堆表面的氡析出规律,以我国南方某铀矿山新上堆的矿石为实验对象,利用自主设计并制造的改进型一维堆浸实验装置,采用局部静态法测定了不同喷淋状态下和排水过程中矿堆表面的氡析出率。结果表明:在布液和改变喷淋强度的瞬间,矿堆表面的氡析出率突然增大,之后随着喷淋的进行而逐渐减小并趋于稳定,且喷淋强度越大,稳定期间的氡析出率反而越小;在排水过程中,氡析出率先迅速减小,而后逐渐增大趋于稳定。

Experimental Study on Radon Exhalation Rule of Heap-leaching Uranium Ore Heap

The heap-leaching uranium ore heap is one of the main sources of atmospheric radon of uranium mine. In order to reveal the radon exhalation rule on the surface of the heap-leaching uranium ore heap, taking the new ores from certain uranium mine in southern China as the experimental samples, the improved one-dimensional heap-leaching experimental device which was designed and made autonomously was used to measure the radon exhalation rate on the surface of the ore heap under different spray conditions and during the drainage with the local static method. The results show that in the moment of beginning spray and changing spray intensity, the radon exhalation rate of the ore heap surface increases suddenly, then gradually decreases and finally reaches stable along with the spray continuing. It is also found that the radon exhalation rate of the ore heap surface during the stable period of the seepage in the ore heap decreases with the increase of spray intensity. In the process of drainage, the radon exhalation rate decreases rapidly, then gradually increase and stabilizes finally.