Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.15372/CSD2021305

Ключевые слова: cenospheres, radioactive waste, Pollucite, plagioclase, tobermorite

Аннотация: The possibility of hydrothermal synthesis of Cs and Sr bearing framework aluminosilicates in the CsNO₃-NaOH-H₂O-(SiO₂-Al₂O₃)_glass and Sr(NO₃)₂-NaOH-H₂O-(SiO₂-Al₂O₃)_glass systems using coal fly ash cenospheres was studied as a low-temperature method to include the water-soluble forms of radionuclides ¹³⁷Cs и ⁹⁰Sr in a mineral-like form. The syntheses were carried out at temperatures in the range of 80-200 °С and autogenous pressure. Narrow fractions of cenospheres with the glass phase content of 90-95 mass % were used as aluminosilicate glass, and compounds of stable isotopes of Cs and Sr were used as imitators of radionuclides ¹³⁷Cs и ⁹⁰Sr. Based on the data obtained in the studies of solid products and post-synthetic solutions by means of X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray microanalysis (SEM-EDX) and atomic absorption spectroscopy (AAS), it was established that the Cs bearing analcime-pollucite solid solutions (Na _n Cs_{1 - n} )AlSi₂O₆• n H₂O are crystallized in the Cs-containing system at 120-150 °C with 98 % Cs⁺ removal from solution to the solid product. The Sr bearing phases of tobermorite and plagioclase structural types are formed in the Sr(NO₃)₂-NaOH-H₂O-(SiO₂-Al₂O₃)_glass system. In this case, the effectiveness of Sr²⁺ extraction from solution is not less than 99.99 %.

Журнал: Chemistry for Sustainable Development

Выпуск журнала: Т. 29, № 3

Номера страниц: 269-279

ISSN журнала: 18171818

Место издания: Novosibirsk

Издатель: Федеральный исследовательский центр угля и углехимии СО РАН, Институт химии твердого тела и механохимии СО РАН, Институт катализа им. Г.К. Борескова СО РАН, Сибирское отделение РАН, Новосибирский институт органической химии им. Н.Н. Ворожцова СО РАН

• Vereshchagina T.A. (FRC Krasnoyarsk Sci Ctr SB RAS, Inst Chem & Chem Technol SB RAS, Krasnoyarsk, Russia)
• Kutikhina E.A. (FRC Krasnoyarsk Sci Ctr SB RAS, Inst Chem & Chem Technol SB RAS, Krasnoyarsk, Russia)
• Mazurova E.V (FRC Krasnoyarsk Sci Ctr SB RAS, Inst Chem & Chem Technol SB RAS, Krasnoyarsk, Russia)
• Fomenko E.V (FRC Krasnoyarsk Sci Ctr SB RAS, Inst Chem & Chem Technol SB RAS, Krasnoyarsk, Russia)
• Anshits A.G. (FRC Krasnoyarsk Sci Ctr SB RAS, Inst Chem & Chem Technol SB RAS, Krasnoyarsk, Russia; Siberian Fed Univ, Dept Chem, Krasnoyarsk, Russia)

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