New Technologies for Decontamination of Radioactive Substances Scattered by Nuclear Accident / Nowe Technologie Dekontaminacji Radioaktywnych Substancji Rozproszonych Przez Awarie Nuklearna

Archives of Metallurgy and Materials

Y. Nishizaki¹  K. Izumiya¹  S. Ichikawa¹  H. Miyamae¹  K. Hashimoto²  T. Takano²  N. Kumagai² 

[1] DAIKI ATAKA ENGINEERING CO., LTD., KASHIWA, 277-8515 JAPAN;TOHOKU INSTITUTE OF TECHNOLOGY, SENDAI, 982-8577 JAPAN

关键词: Keywords: nuclear accident;    scattered Cs;    waste incineration facility;    Cs accumulation;    Cs decontamination;    radioactive waste;    Cs-adsorbed clay suspension;   

DOI  :  10.2478/v10172-012-0186-1

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Our effort for decontamination of radioactive cesium scattered widely by nuclear accident in March 2011 in Fukushima, Japan has been described. Radioactive cesium scattered widely in Japan has been accumulating in arc or plasma molten-solidified ash in waste incinerating facilities up to 90,000 Bq/kg of the radioactive waste. Water rinsing of the ash resulted in dissolution of cesium ions together with high concentrations of potassium and sodium ions. Although potassium inhibits the adsorption of cesium on zeolite, we succeeded to precipitate cesium by in-situ formation of ferric ferrocyanide and iron rust in the radioactive filtrate after rinsing of the radioactive ash with water. Because the regulation of no preservation of any kind of cyanide substances, cesium was separated from the precipitate consisting of cesium-captured ferric ferrocyanide and ferric hydroxide in diluted NaOH solution and subsequent filtration gave rise to the potassium-free radioactive filtrate. Cesium was captured by zeolite from the potassium-free radioactive filtrate. The amount of this final radioactive waste of zeolite was significantly lower than that of the arc-molten-solidified ash.

【 授权许可】

Unknown