The dissolution behavior of U, contained in the soils, was examined through chlorination with ZrCl₄ to reduce the U concentration to clearance levels. Natural soils, composed of Si, Al, and approximately 2 ppm U, acted as surrogates for the contaminated soils. A salt mixture of LiCl-KCl-ZrCl₄ was prepared in an Al₂O₃ crucible at 500°C, and SiO₂ or natural soils were loaded for the chemical reactions. The reaction of SiO₂ and Al₂O₃ with ZrCl₄ was monitored by cyclic voltammetry, and no obvious change was observed. The results showed that SiO₂ and Al₂O₃ were stable against ZrCl₄. The reaction of natural soils with ZrCl₄ indicated that the U content decreased from 2 to 1.2 ppm, while ∼0.4 ppm U appeared in the salt. Thus, the U, in the soils, dissolved into the salt by chlorination with ZrCl₄. Therefore, based on these results, a new method to remediate U-contaminated soil wastes by chlorination with ZrCl₄, followed by electrorefining of U, is suggested.

中文翻译：

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在 LiCl-KCl 共晶盐中用 ZrCl4 氯化处理废土中的铀

通过用 ZrCl ₄氯化以将 U 浓度降低到清除水平来检查土壤中所含 U 的溶解行为。由 Si、Al 和大约 2 ppm U 组成的天然土壤充当受污染土壤的替代物。LiCl-KCl-ZrCl ₄的盐混合物在500°C的Al ₂ O ₃坩埚中制备，并加载SiO ₂或天然土壤进行化学反应。通过循环伏安法监测SiO ₂和Al ₂ O ₃与ZrCl _{4 的}反应，未观察到明显变化。结果表明，SiO ₂和Al ₂ O₃对ZrCl ₄是稳定的。天然土壤与 ZrCl ₄的反应表明，U 含量从 2 ppm 下降到 1.2 ppm，而盐中出现了约 0.4 ppm 的 U。因此，土壤中的 U 通过用 ZrCl ₄氯化而溶解到盐中。因此，基于这些结果，提出了一种通过用 ZrCl ₄氯化然后电解精炼 U来修复 U 污染土壤废物的新方法。