Denitration of simulated radioactive liquid waste

Ristić, Mira; Musić, Svetozar; Marciuš, Marijan; Krehula, Stjepko; Кузманн, Э.; Homonnay, Z.

doi:10.1007/s10967-019-06736-x

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…Simulated HLLW and alkaline LLRW were prepared to explore the possibility of extraction and separation of Tc using MIMDIDOA in the real situation. Compositions of the simulated HLLW , and the alkaline LLRW are shown in Tables and , respectively. During the extraction of alkaline LLRW, n -dodecane is used as a solvent, and the volume ratio of organic phase to aqueous phase is 1:5.…”

Section: Methodsmentioning

confidence: 99%

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

Huang

et al. 2022

Inorg. Chem.

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Due to the highly acidic and high-salinity nature of the high-level radioactive waste liquid (HLLW), selective extraction of TcO4 – from HLLW remains to be a challenging task. Traditional anion exchangers show low selectivity and unsatisfactory extraction performance due to the lack of functional groups that can interact strongly with TcO4 –. In this work, a tailor-made binding site was constructed by decorating two acetamide functional groups on imidazolium cation to fabricate a new Tc separation material, which exhibits high selectivity. Unlike most reported Tc separation materials, which can only perform well under low acidic, neutral, or alkaline conditions, this material still has good extraction performance in highly acidic solutions. In the simulated high-level waste liquid of 3 M nitric acid, the extraction efficiency of 0.5 mol/L organic phase for Tc can reach 96.5% through the first-stage extraction. Our theoretical simulations suggest that ReO4 –/TcO4 – anions were adsorbed on the top of the imidazolium ring during the extraction process, with p−π and p–p interactions acting as the driving forces.

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Section: Methodsmentioning

confidence: 99%

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

Huang

et al. 2022

Inorg. Chem.

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“…6 To minimize waste volume and recover nitric acid, evaporation and denitration treatments are necessary. 7,8 However, the presence of reducing agents can significantly impede subsequent processing due to their potential for chemical explosions during high temperature treatment. 9,10 Therefore, it becomes imperative to eliminate hydroxylamine nitrate and hydrazine nitrate from the nitric acid waste solution.…”

Section: Introductionmentioning

confidence: 99%

Catalytic decomposition of hydrazine nitrate and hydroxylamine nitrate in radioactive nitric acid waste liquid using Ru/AC catalyst

Yu,

Li,

Cao

et al. 2024

New J. Chem.

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“… 3 To reduce the amount of secondary radioactive waste, a large amount of raffinates containing nitric acid and reducing agents used should be handled through the process of continuous evaporation and denitration. 4 However, the presence of hydroxylamine nitrate and hydrazine nitrate in aqueous waste is undesirable, because it often makes the treatment of liquid radioactive waste complex. Furthermore, hydrazine, which is capable of reacting with nitrous acid to form explosive hydrazoic acid, is a potentially hazardous chemical compound in the course of chemical denitration, and hydroxylamine nitrate has been involved in several incidents due to its instability and autocatalytic nature.…”

Section: Introductionmentioning

confidence: 99%