Abstract Ruthenium recovery from the alkaline media was attempted using solid phase extraction. UV-Vis and X-ray absorption studies were performed to understand the ruthenium speciation under different conditions relevant to its extraction from alkaline medium. Since Ru forms anionic complex in the alkaline solution, an anion exchange resin (Dowex 1x8) was selected for its recovery from alkaline media. The precipitation of black RuO2 at the resin surface hinders its back exaction. Experimental conditions were optimized for the quantitative uptake of Ru from alkaline feed and its subsequent back extraction by a series of batch studies. About 90 % of the Ruthenium was back extracted from the resin using alkaline hypochlorite solution and nitric acid solution at different stages in the Ru back extraction cycle. The column studies were done under the optimized condition and showed ~80 % Ru recovery with 5 mL of the eluent (8 M HNO3) and ~90 % recovery in 10 mL including the tailing. The mechanism for the ruthenium extraction from alkaline medium and its back extraction from the resin was proposed.

中文翻译：

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使用阴离子交换树脂从碱性放射性原料中高效分离钌

摘要 尝试使用固相萃取从碱性介质中回收钌。进行了 UV-Vis 和 X 射线吸收研究，以了解钌在与从碱性介质中提取相关的不同条件下的形态。由于 Ru 在碱性溶液中形成阴离子复合物，因此选择阴离子交换树脂 (Dowex 1x8) 从碱性介质中回收。黑色RuO2 在树脂表面的沉淀阻碍了它的反冲。通过一系列批量研究，优化了从碱性进料中定量吸收 Ru 及其后续反萃取的实验条件。在 Ru 反萃取循环的不同阶段，使用碱性次氯酸盐溶液和硝酸溶液从树脂中反萃取了约 90% 的钌。色谱柱研究是在优化条件下进行的，结果表明，使用 5 mL 洗脱液 (8 M HNO3) 时，Ru 回收率约为 80%，包括尾料在内的 10 mL 中回收率约为 90%。提出了从碱性介质中萃取钌及其从树脂中反萃取的机理。