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Research Papers: Nuclear Power

Development of High-Temperature Transport Technologies for Liquid Cadmium in Pyrometallurgical Reprocessing

[+] Author and Article Information
Takatoshi Hijikata, Tadafumi Koyama

Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwado Kita, Komae-shi, Tokyo 201-8511, Japan

J. Eng. Gas Turbines Power 131(4), 042902 (Apr 15, 2009) (8 pages) doi:10.1115/1.3079608 History: Received September 29, 2008; Revised October 15, 2008; Published April 15, 2009

Pyrometallurgical reprocessing is one of the most promising technologies for the advanced fuel cycle with favorable economic potential and intrinsic proliferation-resistance. The feasibility of pyrometallurgical reprocessing has been studied through many laboratory-scale experiments. Hence the development of the engineering technology necessary for pyrometallurgical reprocessing is a key issue for its industrialization. The development of high-temperature transport technologies for molten salt and liquid cadmium is crucial for pyrometallurgical processing; however, there have been a few transport studies on high-temperature fluids. In this study, a metal transport test rig was installed in an argon glove box with the aim of developing technologies for transporting liquid cadmium at approximately 773 K. The transport of liquid Cd using gravity was controlled by adjusting the valve. The liquid Cd was transported by a suction pump against a 0.93 m head and the transport amount of Cd was well controlled with the Cd amount and the position of the suction tube. The transportation of liquid cadmium at approximately 700 K could be controlled at a rate of 0.52.5dm3/min against a 1.6 m head using a centrifugal pump.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow diagram of pyrometallurgical reprocessing

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Figure 2

Apparatus used in gravitation transport experiments

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Figure 3

Relationship between the average flow rate and the valve opening by the gravity

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Figure 4

Relationship between the average flow rate and the liquid Cd temperature with valve opening of 2 turns

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Figure 5

Apparatus used in suction transport experiments

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Figure 6

Relationship between the pressure in vacuum tank and the theoretical pump head in the liquid Cd temperature from 773 K to 973 K

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Figure 7

Relationship between the evacuated time in vacuum tank and the remained level of Cd in the crucible after the transport of Cd at 730 K

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Figure 8

Relationship between the amount of Cd in the crucible and the transport amount of Cd at 730 K

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Figure 9

Relationship between the amount of Cd in the crucible and the flow rate at 730 K

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Figure 10

Apparatus used in the liquid Cd transportation experiment

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Figure 11

Relationship between the average flow rate and the valve opening

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Figure 12

Relationship between the average flow rate and the rotation speed of the centrifugal pump for rotation speeds of 2400 rpm, 2700 rpm, and 3000 rpm

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Figure 13

Relationship between flow rate and liquid Cd temperature at rotation speed of 3000 rpm and valve opening of 0.5 turn

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