Microsphere zeolite materials derived from coal fly ash cenospheres as precursors to mineral-like aluminosilicate hosts for Cs-135,Cs-137 and Sr-90

Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1016/j.jnucmat.2013.01.343

Ключевые слова: Alkaline medium, Bilayered, Cenospheres, Coal fly ash, Distilled water, Hollow microsphere, Hydrothermal treatments, Ion exchanged zeolites, Leaching rates, NaP1 zeolite, Nitrate solutions, Pollucites, Quantitative phase analysis, Solid-phase transformation, Sr-feldspar, State standards, Zeolite materials, Aluminosilicates, Crystalline materials, Differential scanning calorimetry, Feldspar, Fly ash, Glass ceramics, Ion exchange, Leaching, Loading, Microspheres, Zeolites, Cesium

Аннотация: Hollow microsphere zeolite materials with a bilayered zeolite/glass crystalline shell bearing NaP1 zeolite were synthesized by the hydrothermal treatment of coal fly ash cenospheres (Si/Al = 2.7) in an alkaline medium. Cs+ and/or Sr2+ of zeolitized cenospheres with the different Cs+ and/or Sr2+ loading were prepared by the ion exchange from nitrate solutions. The resulted (Cs,Na)P1, (Sr,Na)P1 and (Cs,Sr,Na)P1 bearing microsphere zeolites were converted to glass ceramics by heating at 900-1000 degrees C. The differential scanning calorimetry and quantitative phase analysis were used to monitor the solid-phase transformation of the initial and ion exchanged zeolite materials. It was established that the final solidified forms of Cs+ and/or Sr2+ are glass-crystalline ceramic materials based on pollucite-nepheline, Sr-feldspar-nepheline and Sr-feldspar-pollucite composites including similar to 60 wt.% of the major host phases (pollucite, Sr-feldspar) and 10-20 wt.% of glass. The Cs-137 leaching rate of 4.1 x 10(-7) g cm(-2) day(-1) was determined for the pollucite glass-ceramic according to Russian State Standard (GUST) No. 52126 P-2003 (7 day, 25 degrees C, distilled water). (C) 2013 Elsevier B.V. All rights reserved.

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Издание

Журнал: JOURNAL OF NUCLEAR MATERIALS

Выпуск журнала: Vol. 437, Is. 01.03.2017

Номера страниц: 11-18

ISSN журнала: 00223115

Место издания: AMSTERDAM

Издатель: ELSEVIER SCIENCE BV

Авторы

  • Vereshchagina Tatiana A. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia)
  • Vereshchagin Sergei N. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia)
  • Shishkina Nina N. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia)
  • Vasilieva Nataly G. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia)
  • Solovyov Leonid A. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia)
  • Anshits Alexander G. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Dept Chem, Krasnoyarsk 660041, Russia)

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