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Meguro, Yoshihiro; Sato, Junya
Dekomisshoningu Giho, (54), p.48 - 55, 2016/09
Various radioactive wastes, especially liquiform, pulverized or grained one, have to be immobilized in a disposal container, and methods such as cement solidification, bituminization, etc are so far examined and have been adopted. In recent years novel inorganic solidification materials have been developed. These are named Alkali-activated materials and so geopolymer. Mainly studies of geopolymer applying to radioactive wastes as a solidification material are under research and development stage, but the cases applied to solidification of the real radioactive waste increase a lot. In this report, we briefly explain about some research studies and practical examples of the geopolymer in the field of nuclear energy, particularly those of radioactive wastes generated in Fukushima Daiichi Nuclear Power Station.
Li, Z.*; Onuki, Toshihiko; Ikeda, Ko*
Materials, 9(8), p.633_1 - 633_17, 2016/08
Times Cited Count：26 Percentile：75.01(Chemistry, Physical)Geopolymer samples were prepared at room temperature using paper sludge ashes and immobilization of Sr and Cs in these samples were evaluated by short-term leaching test. The prepared geopolymer samples were semi-crystalline and porous. For the leaching test, the geopolymer samples containing 1 weight % of strontium nitrate or cesium nitrate were prepared, crushed to be finer than 4 mm in size, and immersed in a phthalic salt buffer (pH4) for 6 h. About 0.2% of Sr and 1.3% of Cs were leached from the geopolymer samples.
Sato, Junya; Suzuki, Shinji; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Sato, Junya; Suzuki, Shinji; Nakagawa, Akinori; Kato, Jun; Sakakibara, Tetsuro; Nakazawa, Osamu; Yamashita, Masaaki; Sato, Fuminori; Sukegawa, Hirobumi; Meguro, Yoshihiro
no journal, ,
no abstracts in English
Sato, Junya; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Sato, Junya; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Onozaki, Kimihiro*; Sato, Junya; Suzuki, Shinji*; Kato, Jun; Sakakibara, Tetsuro; Nakazawa, Osamu; Meguro, Yoshihiro; Mikami, Hisashi*; Platzka, M.*; Blazsekova, M.*
no journal, ,
no abstracts in English
Sato, Junya; Irisawa, Keita; Takaoka, Masaki*; Nakazawa, Osamu
no journal, ,
no abstracts in English
Kikuchi, Michio*; Yamamoto, Takeshi*; Otsuka, Taku*; Kawato, Takaya*; Kaneda, Yoshihisa*; Shibata, Masahito*; Haga, Kazuko*; Taniguchi, Takumi; Osugi, Takeshi; Kuroki, Ryoichiro
no journal, ,
Summary of the study which is for characterization of Solidified cement and alkali activated materials was carried out due to obtain the data available for applicability evaluation low-temperature solidification on the waste caused by the contaminated water treatment at Fukushima Daiichi Nuclear Power Station.
Kozai, Naofumi; Utsunomiya, Satoshi*; Onuki, Toshihiko*
no journal, ,
I is one of the most important fission products for safety assessment of radioactive waste repositories. This study investigated basic characteristics of a cement-alternative material candidate, "geopolymer (GP)", on iodine (I
and IO
) confinement. It was found that representative GP, metakaolinite- sodium silicate - based GP, has no ability to chemically retain those iodine anions. I was easily leached from GP solidified bodies. Approximately 80% of IO was retained by GP solidified bodies, which was probably due to physical confinement in the polymer structure. Amount of iodine anions that can be solidified in GP solidified bodies was small since iodine anions do not much dissolve in the liquid used for GP synthesis. However, we also found that a larger amount of iodine anions can be solidified by iodine anions adsorbing layered double hydroxide is solidified in geopolymer.
Kikuchi, Michio*; Yamamoto, Takeshi*; Otsuka, Taku*; Kawato, Takaya*; Kaneda, Yoshihisa*; Sakamoto, Ryo*; Haga, Kazuko*; Kakuda, Ayaka; Osugi, Takeshi; Sone, Tomoyuki; et al.
no journal, ,
no abstracts in English
Otsuka, Taku*; Kikuchi, Michio*; Yamamoto, Takeshi*; Kawato, Takaya*; Kurashige, Isao*; Kakuda, Ayaka; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro
no journal, ,
no abstracts in English
Yamamoto, Takeshi*; Kikuchi, Michio*; Otsuka, Taku*; Kawato, Takaya*; Kurashige, Isao*; Kakuda, Ayaka; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro
no journal, ,
no abstracts in English
Hiraki, Yoshihisa
no journal, ,
no abstracts in English
Hiraki, Yoshihisa
no journal, ,
no abstracts in English
Arisaka, Makoto; Kato, Tomoaki; Sagawa, Yusuke*; Cantarel, V.
no journal, ,
no abstracts in English
香西 直文
not registered
JP, 2019-053372 
Patent licensing information Patent publication (In Japanese)
【課題】pHが弱酸性から中性の範囲に制御され、強度を保持し、建築材料等の用途で好適に使用しうるジオポリマーを提供すること。 【解決手段】メタカオリナイト、活性アルミナ、水酸化アルミニウム、廃棄物焼却灰及び下水汚泥焼却灰などのジオポリマー原料粉末と、高濃度リン酸水溶液、及びアルカリ金属もしくはアンモニウムのリン酸塩又はアルカリ金属もしくはアンモニウムの水酸化物などのpH調整剤とを含む活性化剤とを混合し、その混合物を反応させて、ジオポリマーを製造する。
関 美沙紀; 中野 寛子; 藤田 善貴; 井手 広史
工藤 勇*; 末松 久幸*; Do Thi-Mai-Dung*; Yang Yaru*
JP, 2020-208604 Patent licensing information
【課題】放射性アルミニウムを含むアルカリ活性材料を固化する場合において、放射性アルミニウムの含有量を増やす技術を提供する。 【解決手段】固化体の作製方法は、アルミニウム合金をアルカリ金属の水酸化物溶液に溶解することによって、アルミニウム溶解液を生成する溶解工程(S1)と、原料としてのアルミニウム溶解液、活性フィラー、及びアルカリシリカ溶液を混錬することによって、アルカリ活性材料を生成する混錬工程(S3)と、アルカリ活性材料を型に充填して養生することによって、固化体を作製する固化工程(S4)を含む。
