Porous materials based on cenospheres of coal fly ash for fixation ofCs-137 and Sr-90 in mineral-like aluminosilicates

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: International Symposium on the Scientific Basis for Nuclear Waste Management; Ghent, BELGIUM; Ghent, BELGIUM

Год издания: 2006

Аннотация: Among the crystalline matrices being developed for immobilization Of Cs-137 and Sr-90 are framework aluminosilicates like feldspars and feldspathoids. A novel approach to obtain mineral-like aluminosilicate forms of Cs-137 and 90Sr with using porous materials based on hollow aluminosilicate microspheres of coal fly ash (cenospheres) has been demonstrated. Two modifications of microspherical porous materials have been developed, (i) moulded porous matrices based on consolidated cenospheres and (ii) zeolite sorbents obtained by hydrothermal zeolitization of cenospheres. The first includes impregnation of Cs- or Sr-containing solutions into porous matrices, drying and calcining at temperatures (700-900 degrees C) lower than the softening point of the porous matrix material, at which solid phase crystallization takes place with formation of framework aluminosilicates, such as Cs-nepheline, pollucite or Sr-anorthite. Using zeolite sorbents, immobilization of Cs+ and Sr2+ proceeds through the step of trapping ions from the solution followed by drying and thermochemical solid-phase transformation of saturated zeolites into pollucite or Sr-anorthite over the same temperature range. Cenosphere-derived porous matrices and zeolite sorbents were tested in fixation of (CS)-C-137 using spiked simulants of actual radioactive waste. The durability of crystalline aluminosilicate Cs-137-forms obtained was shown to satisfy Russian (GOST P 50926-96) and international standards.

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Издание

Журнал: SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXIX

Выпуск журнала: Vol. 932

Номера страниц: 591-

ISSN журнала: 02729172

Место издания: WARRENDALE

Издатель: MATERIALS RESEARCH SOC

Авторы

  • Vereshchagina Tatiana A. (SB RAS, Inst Chem & Chem Technol, 42 K Marx St, Krasnoyarsk 660036, Russia)
  • Vasilieva Natalia G. (SB RAS, Inst Chem & Chem Technol, 42 K Marx St, Krasnoyarsk 660036, Russia)
  • Vereshchagin Sergei N. (SB RAS, Inst Chem & Chem Technol, 42 K Marx St, Krasnoyarsk 660036, Russia)
  • Paretskov Evgenyi N. (Mining Chem Combine, Zheleznogorsk 662972, Russia)
  • Zykova Irina D. (Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia)
  • Kruchek Dmitryi M. (Mining Chem Combine, Zheleznogorsk 662972, Russia)
  • Manakova Ludmila F. (Mining Chem Combine, Zheleznogorsk 662972, Russia)
  • Tretyakov Alexander A. (Mining Chem Combine, Zheleznogorsk 662972, Russia)
  • Anshits Alexander G. (SB RAS, Inst Chem & Chem Technol, 42 K Marx St, Krasnoyarsk 660036, Russia)

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