Abstract

The behavior of rare-earth elements (REE) and americium during their extraction with compounds of zirconium and dibutyl phosphoric acid (DBPA) in various solvents from solutions of nitric and hydrochloric acids was studied. It was shown that at a large DBPA to Zr molar ratio, REE and Am(III) are extracted into the organic phase in the form of nonstoichiometric compounds consisting of REE and zirconium cations and tens or hundreds of DBPA molecules. The ability to form such compounds increases with an increase in the serial number of lanthanide. In a number of cases, the change in the concentration of zirconium in the organic phase leads to a noticeable change in the degrees of separation of the elements. The use of decalin as a diluent leads to a maximum increase in the distribution coefficients of REE(III) and Am(III). In hydrochloric acid systems with chloroform or o-nitrotoluene (ONT) solvents at a certain ratio of DBPA to Zr, americium is extracted worse than REE, which may allow their separation.

中文翻译：

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从硝酸和盐酸溶液中用锆和二丁基磷酸化合物萃取分离 REE(III) 和 Am(III)

摘要

研究了用锆和二丁基磷酸 (DBPA) 的化合物在各种溶剂中从硝酸和盐酸溶液中提取稀土元素 (REE) 和镅的行为。结果表明，在较大的 DBPA 与 Zr 摩尔比下，REE 和 Am(III) 以非化学计量化合物的形式提取到有机相中，该化合物由 REE 和锆阳离子以及数十或数百个 DBPA 分子组成。形成此类化合物的能力随着镧系元素序列号的增加而增加。在许多情况下，有机相中锆浓度的变化会导致元素分离程度的显着变化。使用十氢化萘作为稀释剂可最大程度地提高 REE(III) 和 Am(III) 的分配系数。