The mining of strategic U-Mo deposits invariably leads to the generation of wastewater with significant risks of radioactive and heavy metal pollution. This study explores a novel process for the simultaneous precipitation-adsorption of U and Mo from mine drainage, with subsequent solidification of the radioactive Fe(OH) sediments using tailings. The results demonstrate that, under specific conditions, such as 33.6 mg/L Fe and pH 6.0–7.0, more than 97 % of U and Mo can be efficiently co-removed, and the treated water exhibits a gross α radioactivity of less than 0.2 Bq/L. The U-bearing Fe(OH) sediments are transformed into general solid wastes, exhibiting low α radioactivity of less than 1.0 Bq/kg for U, Th or Ra, after being blended with tailings in a mass ratio of 1:50. The reaction, adsorption and solidification mechanisms are further elucidated. The U and Mo are primarily precipitated and adsorbed in the forms of UO(OH) and Fe(MoO) respectively. The U-bearing Fe(OH) particles are firmly encapsulated by negatively charged particles of phlogopite, quartz, and orthoclase, and agglomerate into large particles within the solidification product, thereby reducing U dissolution in simulated acid rain. Ultimately, a sustainable treatment flowsheet is established for the management of U-Mo ore mine drainage and tailings.

中文翻译：

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铁盐与尾矿分步共去除固化矿山排水中U、Mo污染物


战略性铀钼矿床的开采总是会产生废水，具有显着的放射性和重金属污染风险。本研究探索了一种从矿山排水中同时沉淀吸附 U 和 Mo 的新工艺，并随后使用尾矿固化放射性 Fe(OH) 沉积物。结果表明，在特定条件下，如Fe浓度33.6 mg/L、pH 6.0-7.0，97%以上的U和Mo可以被有效地共去除，处理后的水总α放射性小于0.2 Bq/L。含铀Fe(OH)沉积物与尾矿按1:50的质量比混合后转化为一般固体废物，其U、Th或Ra的α放射性低于1.0 Bq/kg。反应、吸附和固化机理得到进一步阐明。 U和Mo主要分别以UO(OH)和Fe(MoO)的形式沉淀和吸附。含U的Fe(OH)颗粒被金云母、石英和正长石的带负电颗粒牢固包裹，并在凝固产物内团聚成大颗粒，从而减少了模拟酸雨中U的溶解。最终，建立了一个可持续的处理流程来管理 U-Mo 矿井排水和尾矿。