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Journal Articles

Separation and recovery of long-lived fission products from high level radioactive waste using electrochemical technique

Kanamura, Shohei*; Takahashi, Yuya*; Omori, Takashi*; Nohira, Toshiyuki*; Sakamura, Yoshiharu*; Matsumura, Tatsuro

Denki Kagaku, 88(3), p.289 - 290, 2020/09

no abstracts in English

Journal Articles

Advanced orient cycle; Progress on fission product separation and utilization

Yamagishi, Isao; Ozawa, Masaki; Mimura, Hitoshi*; Kanamura, Shohei*; Mizuguchi, Koji*

Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.107 - 116, 2010/10

The present paper describes the progress on Fission Product (FP) separation in the Adv.-ORIENT (Advanced Optimization by Recycling Instructive Elements) cycle. The AMP-SG adsorbent (silica gel loaded with ammonium molybdophosphate) and CE-ALG microcapsule (alginate gel polymer enclosed with crown ether) were developed for separation of heat-generating elements, Cs and Sr, respectively. The AMP-SG adsorbed more than 99% of Cs from a simulated High-level Liquid Waste (HLLW). The CE-ALG adsorbed 0.0249 mmol/g of Sr. An electrodeposition is advantageous for both recovery and utilization of PGMs (Ru, Rh, Pd) and Tc. Pd was easily deposited on a Pt electrode. Reduction of Ru and Tc was accelerated in the presence of Pd or Rh. In the simulated HLLW, the redox reaction of Fe(III)/Fe(II) disturbed deposition of elements except for Pd. The deposit on Pt electrode from the simulated HLLW showed higher catalytic reactivity on electrolytic hydrogen production than that from solution containing only PGM.

Oral presentation

Advanced ORIENT cycle study (Phase I), 2; Separation of rare metal, 1; PGMs, Tc and Re

Yamagishi, Isao; Koyama, Shinichi; Ozawa, Masaki; Kanamura, Shohei*; Mizuguchi, Koji*; Omori, Takashi*

no journal, , 

Electro-deposition of light platinum group metals, PGMs (Ru, Rh and Pd), and Tc from high-level liquid waste (HLLW) has been studied for development of an advanced nuclear fuel cycle (Adv.-ORIENT Cycle). PGMs and Tc deposited on Pt electrode are to be used for hydrogen production by catalytic electrolysis of water with its electrode. In nitric acid media, 88.1% of Pd were deposited form a simulated HLLW. In hydrochloric acid media, deposition ratios of Ru, Rh and Re (Tc simulator) were 77.8, 94.8 and 85.2%, respectively.

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