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为了准确、及时判断原地爆破浸出采铀堆场底部是否发生渗漏,需寻找合适的示踪剂在喷淋浸出过程中开展示踪。先采用静态试验在候选示踪剂荧光素钠、溴化钾、碘化钾中筛选出不影响铀的浸出且吸附量最小的荧光素钠作为示踪剂;从表面活性剂MES、MAEPK、DMSS、SDS中,筛选出既有利于铀的浸出又可在铀浸出过程中降低矿石对示踪剂荧光素钠吸附的SDS。,再通过动态柱试验进一步研究荧光素钠与表面活性剂SDS的示踪性能。结果表明,荧光素钠不影响铀浸出,添加表面活性剂不仅使铀浸出率提高约9.01%,而且降低了铀矿石对荧光素钠的吸附,尤其大大降低了矿石对荧光素钠的初始吸附,使得初始穿透水中荧光素钠的质量浓度提高了20.8倍,铀矿石对荧光素钠的分配系数在不加表面活性剂与添加表面活性剂的情况下分别为6.66 mL/g与4.22 mL/g,阻滞系数分别为29.46与20.59,分别降低了36.63%、30.11%。因此,以荧光素钠为示踪剂添加表面活性剂SDS的原地爆破浸出采铀堆场渗漏示踪试验可以及时、准确地判断是否渗漏。
In order to accurately and promptly determine whether leakage occurs at the bottom of uranium storage yard by blasting in situ, a suitable tracer needs to be found for tracing during the leaching process. First, static experiments were conducted to select fluorescein sodium which did not affect the leaching of uranium and the minimum amount of adsorbed sodium fluorescein, potassium bromide and potassium iodide as tracers. From surfactant MES, MAEPK, DMSS, SDS , We screened out the SDS which is beneficial to the leaching of uranium and reduces the absorption of tracer fluorescein sodium in the process of uranium leaching. , And then through dynamic column test to further study the traceability of sodium fluorescein and surfactant SDS. The results showed that sodium fluorescein did not affect the leaching of uranium. The addition of surfactants not only increased the leaching rate of uranium by about 9.01%, but also reduced the adsorption of sodium uranium on sodium fluorescein, especially the initial adsorption of sodium fluorescein on ore. Making the initial penetrating water sodium fluorescein mass concentration increased by 20.8 times, uranium ore to sodium fluorescein partition coefficient in the absence of surfactant and surfactant addition were 6.66 mL / g and 4.22 mL / g , And the retardation coefficients were 29.46 and 20.59 respectively, decreasing by 36.63% and 30.11% respectively. Therefore, the leak detection of uranium storage yard by in-situ blasting SDS with sodium fluorescein as tracer can timely and accurately judge whether leakage.