原地爆破浸出采铀过程中的渗漏示踪研究

发布时间：2018-07-24 18:08

【摘要】：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。
[Abstract]:In order to judge accurately whether leakage occurs at the bottom of in-situ blasting leaching uranium dump, it is necessary to find suitable tracer to carry out tracer during leaching process. First, sodium fluorescein, which has no effect on uranium leaching and has the lowest adsorption amount, was selected from candidate tracer sodium fluorescein, potassium bromide and potassium iodide by static test. SDS., which is beneficial to the leaching of uranium and can reduce the adsorption of the tracer sodium fluorescein by ore during uranium leaching, was selected. The tracer properties of sodium fluorescein and surfactant SDS were further studied by dynamic column test. The results show that sodium fluorescein has no effect on uranium leaching. The addition of surfactant not only increases uranium leaching rate by 9.01, but also reduces the adsorption of sodium fluorescein on uranium ores, especially the initial adsorption of sodium fluorescein. The mass concentration of sodium fluorescein in the initial penetrating water was increased by 20.8 times, The partition coefficients of uranium ore to sodium fluorescein are 6.66 mL/g and 4.22 mL / g without surfactant and 20.59 respectively, and the block coefficients are 29.46 and 20.59, respectively. Therefore, the leakage tracer test with sodium fluorescein as tracer and surfactant SDS in in-situ blasting leaching uranium dump can be used to judge leakage in time and accurately.
【作者单位】：南华大学核科学技术学院;南华大学环境保护与安全工程学院;
【基金】：国家自然科学基金项目(11275092)
【分类号】：TD868

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