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Research Papers: Nuclear Power

Extraction of Actinides and Lanthanides by Supercritical Fluid

[+] Author and Article Information
Liyang Zhu, Jingming Xu, Yongjun Zhu

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China

Wuhua Duan

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, Chinadwh203@mail.tsinghua.edu.cn

J. Eng. Gas Turbines Power 133(5), 052903 (Dec 09, 2010) (8 pages) doi:10.1115/1.4002354 History: Received June 30, 2010; Revised July 02, 2010; Published December 09, 2010; Online December 09, 2010

Reprocessing of used nuclear fuel and nuclear waste management are important issues for the sustainable development of nuclear energy. It is necessary to develop novel nuclear waste treatment technologies to meet the goal of minimizing the secondary liquid waste. Supercritical fluids are considered green solvents in chemical engineering process. Moreover, extraction of metal ions by supercritical fluid is achieved. It gains growing interest to treat nuclear waste using supercritical fluid extraction recently because it can greatly decrease the secondary liquid waste with high radioactivity. During the past 2 decades, extraction of actinides and lanthanides by supercritical fluid has been intensively studied in many countries, and many important progresses have been made. However, the prospect of industrial application of supercritical fluid extraction technology in nuclear waste management is still unclear. In this paper, extraction of actinides and lanthanides from various matrices or from their oxides by supercritical fluid including the experimental results, extraction mechanism, and kinetic process was reviewed. The engineering demonstration projects were introduced. The trend of industrial application of supercritical fluid extraction technology in nuclear waste management was also discussed.

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Figures

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Figure 1

The keto and enol forms of β-diketones

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Figure 2

Extraction of UO2(NO3)2 by supercritical fluid from aqueous solutions

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Figure 3

Schematic diagrams for the extraction of uranium by two-step procedure

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Figure 4

The relation of [HNO3]/[H2O] in TBP-HNO3 complex and in its equilibrium aqueous phase

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Figure 5

Schematic diagram of the kinetic process for the extraction of Nd2O3

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