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Journal Articles

Solidification of radioactive wastes using Alkali-activated materials "Geopolymer"

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.

Journal Articles

Development of paper sludge ash-based geopolymer and application to treatment of hazardous water contaminated with radioisotopes

Li, Z.*; Onuki, Toshihiko; Ikeda, Ko*

Materials, 9(8), p.633_1 - 633_17, 2016/08

 Times Cited Count:14 Percentile:38.46(Materials Science, Multidisciplinary)

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.

Oral presentation

Evaluation of retention properties for metal ions in geopolymer matrix

Sato, Junya; Suzuki, Shinji; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu

no journal, , 

no abstracts in English

Oral presentation

Study of conditioning technologies of secondary wastes produced from contaminated water treatment, 4; Conditioning tests of simulated slurries with inorganic solidified materials

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

Oral presentation

Analysis for the immobilization of metal ions in amorphous aluminosilicate matrix geopolymer

Sato, Junya; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu

no journal, , 

no abstracts in English

Oral presentation

Evaluation of retention properties for metal ions in geopolymer matrix, 2

Sato, Junya; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu

no journal, , 

no abstracts in English

Oral presentation

Encapsulation study of secondary waste stream generated from treatment of contaminated water using the Geopolymer, 1; Encapsulation study of imitation sludge

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

Oral presentation

Evaluation of chemical form of heavy metals in geopolymer matrix by sequential extraction method

Sato, Junya; Irisawa, Keita; Takaoka, Masaki*; Nakazawa, Osamu

no journal, , 

no abstracts in English

Oral presentation

Research and development on preceding processing methods for contaminated water management waste at Fukushima Daiichi Nuclear Power Station, 3; Outline of characteristics evaluation study on solidified body of cement and Alkali Activated Material

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.

Oral presentation

Leaching behavior of iodine anion from metakaolinite-sodium-silicate-based geopolymer

Kozai, Naofumi; Utsunomiya, Satoshi*; Onuki, Toshihiko*

no journal, , 

$$^{129}$$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$$_{3}$$$$^{-}$$) 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$$_{3}$$$$^{-}$$ 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.

Patent

新規ジオポリマー及びその製造方法

香西 直文

not registered

JP, 2019-053372  Patent licensing information

【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。

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