某铀尾矿中U、Th在电场作用下释放及迁移规律

以电流场作为核素迁移的载体,研究某铀尾矿中U、Th在0、0.5、1.0、1.5V/cm直流电场条件下的释放及迁移规律。结果表明,在添加电场时,铀元素的浸出量小于自然淋滤条件下的浸出量,但土壤对铀的释放能力明显提升,且电场强度越强,释放能力越强,而钍元素则受其影响不大。在0、0.5、1.0、1.5V/cm电场强度条件下铀元素的累积浸出量分别为1.439、1.285、1.474、1.795mg/L,说明电场强度对U的释放以及迁移有促进作用。铀元素在电场作用下的迁移规律和其他重金属元素的规律类似,都是阳极往阴极迁移,且电场强度越大,阳极附近富集的铀元素浓度越高。

Release and Migration of U and Th in Uranium Tailings under Electric Field

With current field as carrier of nuclide migration, release and migration of U and Th in uranium tailings under different DC electric fields of 0, 0.5, 1.0 and 1.5 V/cm were investigated. The results show that leaching amount of uranium in electric field is lower than that of natural leaching conditions, but uranium release ability from soil under electric field is significantly improved, and the stronger the electric field intensity, the stronger the release ability is, while Th element is not affected. Cumulative leaching amount of uranium element is 1.439, 1.285, 1.474, and 1.795 mg/L respectively under electric field of 0, 0.5, 1.0 and 1.5 V/cm, which indicates that electric field promotes release and migration of U. Uranium element moves from anode toward cathode under electric field, which is similar to that of other heavy metal elements. The higher the electric field intensity, the higher the concentration of uranium enriched near the anode is.