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Tsukahara, Takehiko*; Saga, Kaname*; Suzuki, Hideya*; Matsumura, Tatsuro
Kurin Tekunoroji, 29(12), p.4 - 7, 2019/12
no abstracts in English
Saito, Kyoichi*; Asai, Shiho
Bunseki Kagaku, 66(11), p.771 - 782, 2017/11
Times Cited Count：1 Percentile：3.39(Chemistry, Analytical)Recovery and purification of rare metals, which are essential ingredients for highly functional materials, generally comes with operational difficulty. In this study, we have developed polymer adsorbents specially designed for highly-efficient adsorption of rare metal ions and exhibited their practical adsorption performances. Radiation-induced graft polymerization, one of the effective modification techniques for polymers, was employed for preparing the proposed adsorbents. Among such adsorbents, a 6-nylon fiber with nucleic-acid base, adenine, on the surface of the fiber demonstrated specific adsorption of ruthenium and palladium ions. In addition, a 6-nylon fiber with an extractant HDEHP (bis (2-ethylhexyl) phophoric acid) that has high affinity for lanthanides, achieved higher separation speed than a commercially available HDEHP-impregnated resin.
Tamada, Masao
Hoshasen Kagaku (Internet), (100), P. 16, 2015/10
Collection of a rare metal form hot spring water attracted medias and had a public response by reports of numerous newspapers and television programs in my 35 years' research and development of radiation processing technologies and its technology management. Collection experiments of the rare metal were carried out in Kusatsu Onsen, Gunma prefecture, where discharge of hot spring water is the largest in Japan. We were on standby 6 am there when morning live broadcast started from 8 am. The invention of emersion grafting solved the problems in the cost reduction of adsorbent production owing to its high grafting yield and led the way for technology transfer of filter for the removal of metal ions in ppb level from semiconductor cleaning liquid and adsorbent for radio-active cesium.
Naganawa, Hirochika
no journal, ,
no abstracts in English
Naganawa, Hirochika
no journal, ,
By the request from Nuclear Cycle Backend Directorate, an innovative chemical separation technique for radioactive materials and metals, Emulsion-flow method, will be introduced in the seminar at Rokkasho-mura titled Rokkasho Nuclear Fuel Cycle Seminar.
Naganawa, Hirochika
no journal, ,
Liquid-liquid extraction (solvent extraction) is a method for extracting a target component from an aqueous solution into an organic solvent immiscible in water, which is very popular in industry especially in metal refining. In the emulsion flow extractor, the flow of an emulsion, which is a fine mixture of aqueous and organic phases, arises by generating micrometer-sized liquid droplets with a nozzle head, and the emulsion flow then promptly disappears by itself with a drastic change of the cross-section area of its passing in the extractor vessel structure. In short, aqueous and organic phases can be effectively mixed to an emulsified condition and then these two liquid phases can be quickly separated to their perfectly clear condition by only sending liquids. Therefore, the emulsion flow extractor is markedly low-cost and simple compared with conventional apparatuses (mixer-settler, etc.) despite showing the highest performance.
