Study of thermal stability for tertiary pyridine ion exchange resin and anti-corrosion property of structural material toward eluents used in the advanced ORIENT cycle process |
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Authors: | S Koyama M Ozawa K Kurosawa K Tatenuma Y Sato K Okada |
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Institution: | (1) Japan Atomic Energy Agency(JAEA), Ibaraki, Japan;(2) Kaken Co., Ltd, Ibaraki, Japan;(3) National Institute of Advanced Industrial Science and Technology(AIST), Ibaraki, Japan |
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Abstract: | A multi-functional separation process is proposed as one of the technologies for implementing the Adv.-ORIENT (Advanced Optimization
by Recycling Instructive ElemeNTs) Cycle concept 1]. The tertiary pyridine-type anion exchange resin (TPR) embedded in silica beads (silica-supported TPR) was demonstrated
suitable for the separation process of actinides from spent fuel. In this process, hydrochloric acid (HCl) and a mixture of
nitric acid (HNO3) and methanol (MeOH) are used as eluents. In order to apply this process to an engineering plant scale, two important issues
must be evaluated to prove the system suitability. One is an environmental aspect represented by the use of HCl solution which
is corrosive to many materials. The other is clarification of the reactive safety of silica-supported TPR and the HNO3–MeOH solvent mixture. Four types of metals, Ta, Zr, Nb, and Hastelloy-B (28%Mo–Ni) were selected as candidate materials which
are anti-corrosive toward HCl. Corrosion experiments were conducted in HCl type simulated high level liquid waste (SHLLW)
solution at room temperature for a maximum 720 h and at 90 °C for 336 h. Ta showed an all-round anti-corrosion property in
HCl type SHLLW solution, and Hastelloy-B was only acceptable at room temperature. Thermal analysis by differential scanning
calorimetry was done to investigate the thermal stability of silica-supported TPR-NO3/MeOH/HNO3 mixtures. Heating experiment results on a gram scale were also obtained and evaluated to determine the conditions necessary
to avoid runaway reactions. As a result, it was confirmed that a vigorous exothermic reaction can be avoided by controlled
decrease of temperature. |
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