An applicable Eluex process was developed for acid in situ leaching (ISL) uranium mine in Bayanwula. In this process, uranium was adsorbed with strong base anion resin from the pregnant solution, then the loaded resin was eluted by sulfuric acid, after Di-(2-ethylhexyl) phosphoric acid (D2EHPA) extraction, the concentrated eluate was enriched and the loaded organic phase was stripped by sodium carbonate, and the yellow cake was obtained by sodium hydroxide precipitation at last. The uranium concentration in loaded strip solution was 52.8 g L−1. Parameters of the process were determined, and the impact of Eluex process in underground leaching was also investigated. In industrial design, 95% of raffinate went back to elution and 5% back to ISL. No significant effect on uranium leaching or resin adsorption has been found.

中文翻译：

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Eluex工艺在酸性ISL中的应用实验研究

为巴彦乌拉的酸原位浸出 (ISL) 铀矿开发了一种适用的 Eluex 工艺。在此过程中，铀用强碱阴离子树脂从富液中吸附，然后负载树脂用硫酸洗脱，经二（2-乙基己基）磷酸（D2EHPA）萃取，浓缩洗脱液富集负载树脂。有机相用碳酸钠汽提，最后氢氧化钠沉淀得黄色滤饼。负载的剥离溶液中的铀浓度为 52.8 g L-1。确定了工艺参数，并研究了 Eluex 工艺对地下浸出的影响。在工业设计中，95% 的萃余液返回洗脱，5% 返回 ISL。未发现对铀浸出或树脂吸附有显着影响。