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Abstract <p>New approaches to the selective isolation of Am from the actinide–lanthanide fraction of high-level waste with preliminary oxidation of Am(III) to Am(V) and Am(VI) using ammonia and ammonia–carbonate media are proposed. When ammonium hydroxide is added to a 0.1 M HNO<sub>3</sub> solution containing Am(V), Cm(III), and Pr(III) (as a mimic of the behavior of lanthanides) to pH ~8, AmO<sub>2</sub><sup>+</sup> shows increased stability and is retained in the solution to 80%, whereas Cm(III) and Pr(III) precipitate in the form of poorly soluble compounds. In ammonia–carbonate solutions at pH ~10, up to 96% of the initial amount of Am(VI) is retained in the solution, and Cm(III) and Pr(III) precipitate to 85%.</p>

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Separation of Am (V, VI) from Cm(III) and Pr(III) in Ammonia and Ammonium-Carbonate Media

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • P. A. Osin,
  • T. I. Trofimov,
  • Yu. M. Kulyako,
  • S. E. Vinokurov,
  • B. F. Myasoedov

摘要

Abstract

New approaches to the selective isolation of Am from the actinide–lanthanide fraction of high-level waste with preliminary oxidation of Am(III) to Am(V) and Am(VI) using ammonia and ammonia–carbonate media are proposed. When ammonium hydroxide is added to a 0.1 M HNO3 solution containing Am(V), Cm(III), and Pr(III) (as a mimic of the behavior of lanthanides) to pH ~8, AmO2+ shows increased stability and is retained in the solution to 80%, whereas Cm(III) and Pr(III) precipitate in the form of poorly soluble compounds. In ammonia–carbonate solutions at pH ~10, up to 96% of the initial amount of Am(VI) is retained in the solution, and Cm(III) and Pr(III) precipitate to 85%.