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Nuclear Waste Partitioning by New Extractants

#2068


Development and Demonstration of HLW Partitioning Technology with the Use of Phosphorylated Calixarenes

Tech Area / Field

  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
8 Project completed

Registration date
13.12.2000

Completion date
08.08.2006

Senior Project Manager
Tocheny L V

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg

Supporting institutes

  • Institute of Inorganic Chemistry, Russia, Novosibirsk reg., Akademgorodok

Collaborators

  • University of Twente / Faculty of Chemical Technology, The Netherlands, Enschede\nUniversita degli Studi di Parma / Dipartimento di Chimica Organica e Industriale, Italy, Parma\nUniversité Louis Pasteur, France, Strasbourg\nCEA / DCC / CEN Cadarache, France, Cadarache\nJohannes Gutenberg-Universitat Mainz, Institut Fur Kernchemie, Germany, Mainz\nEuropean Commission, Belgium, Brussels

Project summary

Long-lived radionuclides, particularly actinide elements, are the most hazardous components of waste arising from nuclear power utilization. Their separation from the bulk and inpidual burial or partitioning (transmutation) should considerably contribute to the ecological safety of nuclear fuel cycle. Extraction technology of radwaste partitioning with the use of organophosphorus extractants is well suited for solving this problem. The routine monodentate extractants like trialkylphosphine oxides do not afford the efficient recovery of actinides and other hazardous radionuclides from acidic high-level waste (HLW). Radically new extractants developed in recent years – phosphorylated calixarenes or other class of extractants – enable to recover long-lived radionuclides from HLW selectively and efficiently. For realizing the potential of such calixarenes, it is necessary to choose specific extractants and diluents, to establish conditions of radionuclides extraction and stripping, to arrange a flowsheet providing the needed decontamination of HLW from long-lived radionuclides.

Hence, the main goal of the project is to elaborate scientific fundamentals of HLW partitioning technology by using the new extractants-phosphorylated calixarenes and to test its efficiency with actual HLW.

Realization of this goal will contribute to the ecological safety and efficiency of radwaste partitioning technology, meets the national priorities of Russia and Ukraine and is in agreement with the ISTC's goals.

In the course of work under the project the Ukrainian side develops new procedures for synthesis of phosphorylated calixarenes and other promising extractants, prepares samples to be investigated and carries out the synthesis of enlarged laboratory sample to be tested on partitioning of actual HLW. In collaboration with the Russian side, the Ukrainian side performs analysis of the physico-chemical and extraction properties of synthesized compounds and takes part in selection of the most efficient extractant.

The Russian part is engaged in studies of extraction and other properties of compounds synthesized by the Ukrainian side, determines the conditions of radionuclides extraction and stripping, develops flowsheet providing the needed purification of HLW from long-lived radionuclides and performs its testing with actual HLW.


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The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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