Abstract

Gas-phase conversion to water-soluble compounds of individual rare-earth element (REE) (La, Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Lu) oxides and oxide systems (U,Ce)O_x and (U,Nd)O_x in the atmospheres HNO₃ (vapor)–air and NO_x–H₂O (vapor)–air was examined. It was shown that water-soluble compounds are formed in the gas-phase conversion of REE oxides in the atmosphere of both HNO₃ vapor and NO_x gases. In the case of (U,Ce)O_x in the atmosphere of HNO₃ (vapor)–air, water-soluble compounds of uranium are formed, with a part of cerium remaining in the phase of the water-insoluble precipitate. The conversion of (U,Nd)O_x under the same conditions yields water-soluble compounds of both uranium and neodymium. It was found that these gas media can be used in principle to extract uranium from fuel systems containing rare-earth elements.

中文翻译：

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镧系元素和铀的氧化物相的气相转化为水溶性化合物

摘要

气相转化为单个稀土元素（REE）（La，Ce，Pr，Nd，Sm，Eu，Dy，Ho，Er，Tm，Lu）氧化物和氧化物体系（U，Ce）的水溶性化合物检查了HNO ₃（蒸气）-空气和NO _x -H ₂ O（蒸气）-空气中的O _x和（U，Nd）O _x。结果表明，在HNO ₃蒸气和NO _x气体的气氛中，REE氧化物的气相转化均形成了水溶性化合物。在HNO ₃气氛中为（U，Ce）O _x会形成（蒸气）-空气中的水溶性铀化合物，一部分铈保留在水不溶性沉淀物的相中。在相同条件下（U，Nd）O _x的转化会产生铀和钕的水溶性化合物。已经发现，这些气体介质原则上可以用于从含有稀土元素的燃料系统中提取铀。