Development of High-Temperature Transport Technologies of Molten Salt Slurry in Pyrometallurgical Reprocessing

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概要

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• Pyrometallurgical-reprocessing is one of the most promising technologies for advanced fuel cycle with favorable economic potential and intrinsic proliferation resistance. The development of transport technology for molten salt is a key issue in the industrialization of pyro-reprocessing. As for pure molten LiCl-KCl eutectic salt at approximately 773 K, we have already reported the successful results of transport using gravity and a centrifugal pump. However, molten salt in an electrorefiner mixes with insoluble fines when spent fuel is dissolved in porous anode basket. The insoluble consists of noble metal fission products, such as Pd, Ru, Mo, and Zr. There have been very few transport studies of a molten salt slurry (metal fines-molten salt mixture). Hence, transport experiments on a molten salt slurry were carried out to investigate the behavior of the slurry in a tube. The apparatus used in the transport experiments on the molten salt slurry consisted of a supply tank, a 10° inclined transport tube (10 mm inner diameter), a valve, a filter, and a recovery tank. Stainless steel (SS) fines with diameters from 53 to 415 μm were used. To disperse these fines homogenously, the molten salt and fines were stirred in the supply tank by an impeller at speeds from 1200 to 2100 rpm. The molten salt slurry containing 0.04 to 0.4 vol.% SS fines was transported from the supply tank to the recovery tank through the transportation tube. In the recovery tank, the fines were separated from the molten salt by the filter to measure the transport behavior of molten salt and SS fines. When the velocity of the slurry was 0.02 m/s, only 1% of the fines were transported to the recovery tank. On the other hand, most of the fines were transported when the velocity of the slurry was more than 0.8 m/s. Consequently, the molten salt slurry can be transported when the velocity is more than 0.8 m/s.

著者

• Koyama Tadafumi

  Central Research Institute Of Electric Power Industry (criepi)

• Koyama Tadafumi

  Central Res. Inst. Of Electric Power Ind.

• HIJIKATA Takatoshi

  Central Research Institute of Electric Power Industry

関連論文

• Conversion of Simulated High-level Liquid Waste to Chloride for the Pretreatment of Pyrometallurgical Partitioning Process
• Separation Of Actinides from Rare Earth Elements by Electrorefining in LiCl-KCl Eutectic Salt
• Integrated Experiments of Electrometallurgical Pyroprocessing Using Plutonium Oxide
• Recovery of Transuranium Elements from Real High-Level Liquid Waste by Pyropartitioning Process
• Development of Fast Reactor Metal Fuels Containing Minor Actinides
• Development of High-Temperature Transport Technologies of Molten Salt Slurry in Pyrometallurgical Reprocessing
• Novel Chlorination of Zirconium Dioxide at Low Temperature
• Development of High Temperature Molten Salt Transport Technology for Pyrometallurgical Reprocessing

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