Immobilization process of selenate in cancrinite by hydrothermal method

Niko Dian Pahlevi, Binglin Guo, Tsuyoshi Hirajima, Keiko Sasaki

Research output: Contribution to conferencePaper

Abstract

Anionic radionuclides are known to be hardly immobilized in most minerals and in addition they possess quite long half-life in the order of 105~107 years. In Fukushima Daiichi Nuclear Power Plant (FDNPP) anion exchange resin is utilized to immobilize these oxo-anions like selenate (79SeO42-)/selenite (79SeO32-) in Advanced Liquid Processing System. However, resins are not always suitable to store underground for long years, due to high biodegradability. The technologies for stable storage of anionic radionuclides are strongly desired to develop before decommissioning of the FDNPP reactor. It has been known that hydrocalumite and ettringite are typical anionic exchangers for selenite. However, these matrixes have low chemical stability under low pH conditions. In this study, cancrinite and sodalite were proposed as selenate matrixes, where both matrixes are stable in the wider range of pH.

Original languageEnglish
Publication statusPublished - Jan 1 2017
Event14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, Japan
Duration: Sep 26 2017Sep 29 2017

Conference

Conference14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
CountryJapan
CitySapporo, Hokkaido
Period9/26/179/29/17

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)

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    Pahlevi, N. D., Guo, B., Hirajima, T., & Sasaki, K. (2017). Immobilization process of selenate in cancrinite by hydrothermal method. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.